Cruise control system using instruction sent from switch

Claim 2

A cruise control system installed in a vehicle and electrically connected to a plurality of switches installed therein, the plurality of switches including a first and a second switch, each of the plurality of switches configured to send, to the cruise control system, an instruction associated with cruise control of the vehicle when operated, the cruise control system comprising: a detecting unit configured to detect that at least one of the plurality of switches is operated; a determining unit having at least one predetermined combination of instructions to be sent from the plurality of switches as at least one disallowed combination, having any combination of instructions, except for the at least one disallowed combination, to be sent from the plurality of switches as one or more allowed combinations, and configured to, when the detecting unit detects that, during the first switch being operated, the second switch is operated, determine whether a combination of first and second instructions sent from the detected first and second switches is matched with the at least one disallowed combination or the one or more allowed combination; and a cruise control unit configured to: accept an instruction corresponding to the at least one of the plurality of switches upon detection of the at least one of the plurality of switches being operated to thereby execute cruise control of the vehicle based on the accepted instruction; prevent acceptance of the second instruction when it is determined that the combination of the first and second instructions is matched with the at least one disallowed combination; and accept the second instruction when it is determined, that the combination of the first and second instructions is matched with the one or more allowed combinations.

Claim 3

The cruise control system according to claim 1 , wherein: the plurality of switches includes a main switch, a cancel switch, a set switch, and a resume switch, the main switch sending, to the cruise control system, an instruction for one of ready and stop of cruise control of the vehicle when operated, the cancel switch sending, to the cruise control system, an instruction for cancel of cruise control of the vehicle when operated, the set switch sending, to the cruise control system, an instruction for start of cruise control of the vehicle at a current speed when operated, the current speed being a speed at a time of the set switch being operated, the resume switch sending, to the cruise control system, an instruction for resuming cruise control of the vehicle at a preset speed, the first switch is one of the main switch and the cancel switch, the second switch is one of the set switch and the resume switch, the main switch, the cancel switch, the set switch, and the resume switch are prioritized in this order, and when, during one of the main switch, the cancel switch, the set switch, and the resume switch being operated as the first switch, an alternative one of the main switch, the cancel switch, the set switch, and the resume switch, which is lower in priority than the operated one of the main switch, the cancel switch, the set switch, and the resume switch, is operated as the second switch, the detecting unit is configured to detect the one of the main switch, the cancel switch, the set switch, and the resume switch in higher priority than the alternative one of the main switch, the cancel switch, the set switch, and the resume switch.

Claim 4

The cruise control system according to claim 2 , further comprising a power supply; a first line; a pull-up resistor connected to the power supply and the first line; a first resistor; a second resistor; a third resistor; and a second line, wherein the main switch has opposing first and second ends, the first end is connected to the power supply via the first line and the pull-up resistor, the other end is connected to ground via the second line, the cancel switch has opposing first and second ends, the first end of the cancel switch is connected to the power supply via the first line, the first resistor and the pull-up resistor, the second end of the cancel switch is connected to the ground via the second line, the set switch has opposing first and second ends, the first end of the set switch is connected to the power supply via the first line, the first resistor, the second resistor, and the pull-up resistor, the second end of the set switch is connected to the ground via the second line, the resume switch has opposing first and second ends, the first end of the resume switch is connected to the power supply via the first line, the first resistor, the second resistor, the third resistor, and the pull-up resistor, the second end of the resume switch is connected to the ground via the second line, the main switch, the cancel switch, the set switch, and the resume switch are prioritized in this order because, even if at least two switches in the main switch, the cancel switch, the set switch, and the resume switch are simultaneously operated, a resistance of a circuit formed between the power supply and the ground is set to be identical to a resistance of the circuit in which one of the at least two switches is only turned on, the one of the at least two switches being located closer to the pull-up resistor than the other thereof, the detecting unit is configured to detect operations of the plurality of switches based on a signal level on the first line.

Claim 5

A cruise control system according to claim 1 , wherein the first switch is configured to send, to the cruise control system, the first instruction enabling the cruise control unit to cancel cruise control of the vehicle, the second switch is configured to send, to the cruise control system, the second instruction enabling the cruise control unit to start cruise control of the vehicle, and the detecting unit is configured to detect that the first switch is operated and that the second switch is operated during the first switch being operated.

Claim 6

A cruise control system according to claim 1 , wherein the cruise control unit is configured to, when it is determined that the combination of the first and second instructions is matched with the at least one disallowed combination, accept one of the first and second instructions to thereby execute cruise control of the vehicle based on the accepted one of the first and second instructions upon the accepted one of the first and second instructions enabling the cruise control unit to cancel cruise control of the vehicle.

Claim 7

A cruise control system according to claim 1 , wherein each of the instructions including the first and second instructions to be sent from the plurality of switches is an electric signal with a predetermined level, the predetermined levels of the instructions to be sent from the plurality of switches allow the instructions to be identified with each other, the plurality of switches are prioritized such that, when one switch and another switch lower in priority than the one switch are operated to be overlapped in duration with each other, the one switch takes priority to thereby send an instruction to the cruise control system, and the detecting unit is configured to detect that, during the first switch being operated, the second switch is operated based on the levels of the first and second instructions sent from the first and second switches.

Claim 8

The cruise control system according to claim 1 , wherein the plurality of switches includes a main switch, a cancel switch, a set switch, and a resume switch, the main switch sending, to the cruise control system, an instruction for one of ready and stop of cruise control of the vehicle when operated, the cancel switch sending, to the cruise control system, an instruction for cancel of cruise control of the vehicle when operated, the set switch sending, to the cruise control system, an instruction for start of cruise control of the vehicle at a current speed when operated, the current speed being a speed at a time of the set switch being operated, the resume switch sending, to the cruise control system, an instruction for resuming cruise control of the vehicle at a preset speed, the first switch is one of the main switch and the cancel switch, the second switch is one of the set switch and the resume switch, and the cruise control unit is configured to: accept the second instruction when it is determined that the combination of the first and second instructions is mismatched with the at least one disallowed combination.

Claim 9

A cruise control system installed in a vehicle and electrically connected to a plurality of switches installed therein, the plurality of switches including a first and a second switch, each of the plurality of switches being configured to send, to the cruise control system, an instruction associated with cruise control of the vehicle when operated, the cruise control system comprising: a detecting unit configured to detect that at least one of the plurality of switches is operated; a cruise control unit configured to execute cruise control of the vehicle based on an instruction corresponding to the at least one of the plurality of switches upon detection of the at least one of the plurality of switches being operated; a cruise control disabling unit having at least one predetermined combination of instructions to be sent from the plurality of switches as at least one disallowed combination, and configured to, when the detecting unit detects that, during the first switch being operated, the second switch is operated, and when a combination of first and second instructions sent from the detected first and second switches is matched with the at least one disallowed combination, disable the cruise control unit to execute cruise control of the vehicle based on the second instruction; and a cruise control enabling unit having any combination of instructions, except for the at least one disallowed combination, to be sent from the plurality of switches as one or more allowed combinations, and configured to, when the detecting unit detects that, during the first switch being operated, the second switch is operated, and when the combination of the first and second instructions sent from the detected first and second switches is matched with the one or more allowed combinations, enable the cruise control unit to execute cruise control of the vehicle based on the second instruction.

Claim 10

A cruise control system installed in a vehicle and electrically connected to a plurality of switches installed therein, the plurality of switches including a first and a second switch, each of the plurality of switches being configured to send, to the cruise control system, an instruction associated with cruise control of the vehicle when operated, the cruise control system comprising: a detecting unit configured to detect that at least one of the plurality of switches is operated; a cruise control unit configured to execute cruise control of the vehicle based on an instruction corresponding to the at least one of the plurality of switches upon detection of the at least one of the plurality of switches being operated; a cruise control disabling unit having at least one predetermined combination of instructions to be sent from the plurality of switches as at least one disallowed combination, and configured to, when the detecting unit detects that, during the first switch being operated, the second switch is operated, and when a combination of first and second instructions sent from the detected first and second switches is matched with the at least one disallowed combination, disable the cruise control unit to execute cruise control of the vehicle based on the second instruction; and a cruise control enabling unit having any combination of instructions, except for the at least one disallowed combination, to be sent from the plurality of switches as one or more allowed combinations, and configured to, when the detecting unit detects that, during the first switch being operated, the second switch is operated, and when the combination of the first and second instructions sent from the detected first and second switches is matched with the one or more allowed combinations, enable the cruise control unit to execute cruise control of the vehicle based on the second instruction.

Claim 11

The cruise control system according to claim 8 , wherein: the plurality of switches includes a main switch, a cancel switch, a set switch, and a resume switch, the main switch sending, to the cruise control system, an instruction for one of ready and stop of cruise control of the vehicle when operated, the cancel switch sending, to the cruise control system, an instruction for cancel of cruise control of the vehicle when operated, the set switch sending, to the cruise control system, an instruction for start of cruise control of the vehicle at a current speed when operated, the current speed being a speed at a time of the set switch being operated, the resume switch sending, to the cruise control system, an instruction for resuming cruise control of the vehicle at a preset speed, the first switch is one of the main switch and the cancel switch, the second switch is one of the set switch and the resume switch, the main switch, the cancel switch, the set switch, and the resume switch are prioritized in this order, and when, during one of the main switch, the cancel switch, the set switch, and the resume switch being operated as the first switch, an alternative one of the main switch, the cancel switch, the set switch, and the resume switch, which is lower in priority than the operated one of the main switch, the cancel switch, the set switch, and the resume switch, is operated as the second switch, the detecting unit is configured to detect the one of the main switch, the cancel switch, the set switch, and the resume switch in higher priority than the alternative one of the main switch, the cancel switch, the set switch, and the resume switch.

Claim 12

The cruise control system according to claim 9 , further comprising a power supply; a first line; a pull-up resistor connected to the power supply and the first line; a first resistor; a second resistor; a third resistor; and a second line, wherein the main switch has opposing first and second ends, the first end is connected to the power supply via the first line and the pull-up resistor, the other end is connected to ground via the second line, the cancel switch has opposing first and second ends, the first end of the cancel switch is connected to the power supply via the first line, the first resistor and the pull-up resistor, the second end of the cancel switch is connected to the ground via the second line, the set switch has opposing first and second ends, the first end of the set switch is connected to the power supply via the first line, the first resistor, the second resistor, and the pull-up resistor, the second end of the set switch is connected to the ground via the second line, the resume switch has opposing first and second ends, the first end of the resume switch is connected to the power supply via the first line, the first resistor, the second resistor, the third resistor, and the pull-up resistor, the second end of the resume switch is connected to the ground via the second line, the main switch, the cancel switch, the set switch, and the resume switch are prioritized in this order because, even if at least two switches in the main switch, the cancel switch, the set switch, and the resume switch are simultaneously operated, a resistance of a circuit formed between the power supply and the ground is set to be identical to a resistance of the circuit in which one of the at least two switches is only turned on, the one of the at least two switches being located closer to the pull-up resistor than the other thereof, the detecting unit is configured to detect operations of the plurality of switches based on a signal level on the first line.

Claim 13

A cruise control system according to claim 8 , further comprising: an accepting unit configured to: determine whether to accept an instruction sent from another switch contained in the plurality of switches being operated after the cruise control of the vehicle based on the second instruction is disabled by the cruise control disabling unit, the another switch being a switch other than the second switch; and accept the instruction sent from the another switch when it is determined that the instruction is accepted, thus executing cruise control of the vehicle based on the instruction sent from the another switch.

Claim 14

The cruise control system according to claim 8 , wherein the plurality of switches includes a main switch, a cancel switch, a set switch, and a resume switch, the main switch sending, to the cruise control system, an instruction for one of ready and stop of cruise control of the vehicle when operated, the cancel switch sending, to the cruise control system, an instruction for cancel of cruise control of the vehicle when operated, the set switch sending, to the cruise control system, an instruction for of start cruise control of the vehicle at a current speed when operated, the current speed being a speed at a time of the set switch being operated, the resume switch sending, to the cruise control system, an instruction for resuming cruise control of the vehicle at a preset speed, the first switch is one of the main switch and the cancel switch, the second switch is one of the set switch and the resume switch, and the cruise control disabling unit is configured to, when the detecting unit detects that, during the first switch being operated, the second switch is operated, and when a combination of first and second instructions sent from the detected first and second switches is mismatched with the at least one disallowed combination, enable the cruise control unit to execute cruise control of the vehicle based on the second instruction.

Claim 15

A program product embedded in a media accessible by a computer installed in a vehicle and electrically connected to a plurality of switches installed therein, the plurality of switches including a first and a second switch, each of the plurality of switches configured to send, to the computer, an instruction associated with cruise control of the vehicle when operated, the program product comprising: first means for instructing the computer to detect that at least one of the plurality of switches is operated; second means, having at least one predetermined combination of instructions to be sent from the plurality of switches as at least one disallowed combination and having any combination of instructions, except for the at least one disallowed combination, to be sent from the plurality of switches as one or more allowed combinations, for instructing the computer to, when, during the first switch being operated, operation of the second switch is detected, determine whether a combination of first and second instructions sent from the detected first and second switches is matched with the at least one disallowed combination or the one or more allowed combinations; third means for instructing the computer to accept an instruction corresponding to the at least one of the plurality of switches upon detection of the at least one of the plurality of switches being operated to thereby execute cruise control of the vehicle based on the accepted instruction; fourth means for instructing the computer to prevent acceptance of the second instruction when it is determined that the combination of the first and second instructions is matched with the at least one disallowed combination; and fifth means for instructing the computer to accept the second instruction when it is determined that the combination of the first and second instructions is matched with the one or more allowed combinations.

Claim 16

A program product embedded in a media accessible by a computer installed in a vehicle and electrically connected to a plurality of switches installed therein, the plurality of switches including a first and a second switch, each of the plurality of switches configured to send, to the computer, an instruction associated with cruise control of the vehicle when operated, the program product comprising: first means for instructing the computer to detect that at least one of the plurality of switches is operated; second means, having at least one predetermined combination of instructions to be sent from the plurality of switches as at least one disallowed combination and having any combination of instructions, except for the at least one disallowed combination, to be sent from the plurality of switches as one or more allowed combinations, for instructing the computer to, when, during the first switch being operated, operation of the second switch is detected, determine whether a combination of first and second instructions sent from the detected first and second switches is matched with the at least one disallowed combination or the one or more allowed combinations; third means for instructing the computer to accept an instruction corresponding to the at least one of the plurality of switches upon detection of the at least one of the plurality of switches being operated to thereby execute cruise control of the vehicle based on the accepted instruction; fourth means for instructing the computer to prevent acceptance of the second instruction when it is determined that the combination of the first and second instructions is matched with the at least one disallowed combination; and fifth means for instructing the computer to accept the second instruction when it is determined that the combination of the first and second instructions is matched with the one or more allowed combinations.

Claim 17

The program product according to claim 13 , wherein: the plurality of switches includes a main switch, a cancel switch, a set switch, and a resume switch, the main switch sending, to the cruise control system, an instruction for one of ready and stop of cruise control of the vehicle when operated, the cancel switch sending, to the cruise control system, an instruction for cancel of cruise control of the vehicle when operated, the set switch sending, to the cruise control system, an instruction for start of cruise control of the vehicle at a current speed when operated, the current speed being a speed at a time of the set switch being operated, the resume switch sending, to the cruise control system, an instruction for resuming cruise control of the vehicle at a preset speed, the first switch is one of the main switch and the cancel switch, the second switch is one of the set switch and the resume switch, the main switch, the cancel switch, the set switch, and the resume switch are prioritized in this order, and when, during one of the main switch, the cancel switch, the set switch, and the resume switch being operated as the first switch, an alternative one of the main switch, the cancel switch, the set switch, and the resume switch, which is lower in priority than the operated one of the main switch, the cancel switch, the set switch, and the resume switch, is operated as the second switch, the first means for instructing the computer to detect the one of the main switch, the cancel switch, the set switch, and the resume switch in higher priority than the alternative one of the main switch, the cancel switch, the set switch, and the resume switch.

Claim 18

The program product according to claim 14 , further comprising a power supply; a first line; a pull-up resistor connected to the power supply and the first line; a first resistor; a second resistor; a third resistor; and a second line, wherein the main switch has opposing first and second ends, the first end is connected to the power supply via the first line and the pull-up resistor, the other end is connected to ground via the second line, the cancel switch has opposing first and second ends, the first end of the cancel switch is connected to the power supply via the first line, the first resistor and the pull-up resistor, the second end of the cancel switch is connected to the ground via the second line, the set switch has opposing first and second ends, the first end of the set switch is connected to the power supply via the first line, the first resistor, the second resistor, and the pull-up resistor, the second end of the set switch is connected to the ground via the second line, the resume switch has opposing first and second ends, the first end of the resume switch is connected to the power supply via the first line, the first resistor, the second resistor, the third resistor, and the pull-up resistor, the second end of the resume switch is connected to the ground via the second line, the main switch, the cancel switch, the set switch, and the resume switch are prioritized in this order because, even if at least two switches in the main switch, the cancel switch, the set switch, and the resume switch are simultaneously operated, a resistance of a circuit formed between the power supply and the ground is set to be identical to a resistance of the circuit in which one of the at least two switches is only turned on, the one of the at least two switches being located closer to the pull-up resistor than the other thereof, the first means for instructing the computer to detect operations of the plurality of switches based on a signal level on the first line.

Claim 19

A program product according to claim 13 , wherein the first switch is configured to send, to the computer, the first instruction enabling the computer to cancel cruise control of the vehicle, the second switch is configured to send, to the computer, the second instruction enabling the computer to start cruise control of the vehicle, and the first means is configured to instruct the computer to detect that the first switch is operated and that the second switch is operated during the first switch being operated.

Claim 20

A program product according to claim 13 , wherein the fourth means is configured to instruct the computer to, when it is determined that the combination of the first and second instructions is matched with the at least one disallowed combination, accept one of the first and second instructions to thereby execute cruise control of the vehicle based on the accepted one of the first and second instructions upon the accepted one of the first and second instructions enabling the computer to cancel cruise control of the vehicle.

Claim 21

A program product according to claim 13 , wherein each of the instructions including the first and second instructions to be sent from the plurality of switches is an electric signal with a predetermined level, the predetermined levels of the instructions to be sent from the plurality of switches allow the instructions to be identified with each other, the plurality of switches are prioritized such that, when one switch and another switch lower in priority than the one switch are operated to be overlapped in duration with each other, the one switch takes priority to thereby send an instruction to the computer, and the first means is configured to instruct the computer to detect that, during the first switch being operated, the second switch is operated based on the levels of the first and second instructions sent from the first and second switches.

Claim 22

The program product according to claim 13 , wherein the plurality of switches includes a main switch, a cancel switch, a set switch, and a resume switch, the main switch sending, to the computer, an instruction for one of ready and stop of cruise control of the vehicle when operated, the cancel switch sending, to the computer, an instruction for cancel of cruise control of the vehicle when operated, the set switch sending, to the computer, an instruction for start of cruise control of the vehicle at a current speed when operated, the current speed being a speed at a time of the set switch being operated, the resume switch sending, to the computer, an instruction for resuming cruise control of the vehicle at a preset speed, the first switch is one of the main switch and the cancel switch, the second switch is one of the set switch and the resume switch, and the fourth means is configured to further instruct the computer to accept the second instruction when it is determined that the combination of the first and second instructions is mismatched with the at least one disallowed combination.

Claim 23

A program product embedded in a media accessible by a computer installed in a vehicle and electrically connected to a plurality of switches installed therein, the plurality of switches including a first and a second switch, each of the plurality of switches being configured to send, to the computer, an instruction associated with cruise control of the vehicle when operated, the program product comprising: first means for instructing the computer to detect that at least one of the plurality of switches is operated; second means for instructing the computer to execute cruise control of the vehicle based on an instruction corresponding to the at least one of the plurality of switches upon detection of the at least one of the plurality of switches being operated; third means, having at least one predetermined combination of instructions to be sent from the plurality of switches as at least one disallowed combination, for instructing the computer to, when, during the first switch being operated, the second switch is operated, and when a combination of first and second instructions sent from the detected first and second switches is matched with the at least one disallowed combination, disable the computer to execute cruise control of the vehicle based on the second instruction; and fourth means, having any combination of instructions, except for the at least one disallowed combination, to be sent from the plurality of switches as one or more allowed combinations, for instructing the computer to, when, during the first switch being operated, the second switch is operated, and when the combination of the first and second instructions sent from the detected first and second switches is matched with the one or more allowed combinations, enable the cruise control unit to execute cruise control of the vehicle based on the second instruction.

Claim 24

A program product embedded in a media accessible by a computer installed in a vehicle and electrically connected to a plurality of switches installed therein, the plurality of switches including a first and a second switch, each of the plurality of switches being configured to send, to the computer, an instruction associated with cruise control of the vehicle when operated, the program product comprising: first means for instructing the computer to detect that at least one of the plurality of switches is operated; second means for instructing the computer to execute cruise control of the vehicle based on an instruction corresponding to the at least one of the plurality of switches upon detection of the at least one of the plurality of switches being operated; third means, having at least one predetermined combination of instructions to be sent from the plurality of switches as at least one disallowed combination, for instructing the computer to, when, during the first switch being operated, the second switch is operated, and when a combination of first and second instructions sent from the detected first and second switches is matched with the at least one disallowed combination, disable the computer to execute cruise control of the vehicle based on the second instruction; and fourth means, having any combination of instructions, except for the at least one disallowed combination, to be sent from the plurality of switches as one or more allowed combinations, for instructing the computer to, when, during the first switch being operated, the second switch is operated, and when the combination of the first and second instructions sent from the detected first and second switches is matched with the one or more allowed combinations, enable the cruise control unit to execute cruise control of the vehicle based on the second instruction.

Claim 25

The program product according to claim 20 , wherein: the plurality of switches includes a main switch, a cancel switch, a set switch, and a resume switch, the main switch sending, to the cruise control system, an instruction for one of ready and stop of cruise control of the vehicle when operated, the cancel switch sending, to the cruise control system, an instruction for cancel of cruise control of the vehicle when operated, the set switch sending, to the cruise control system, an instruction for start of cruise control of the vehicle at a current speed when operated, the current speed being a speed at a time of the set switch being operated, the resume switch sending, to the cruise control system, an instruction for resuming cruise control of the vehicle at a preset speed, the first switch is one of the main switch and the cancel switch, the second switch is one of the set switch and the resume switch, the main switch, the cancel switch, the set switch, and the resume switch are prioritized in this order, and when, during one of the main switch, the cancel switch, the set switch, and the resume switch being operated as the first switch, an alternative one of the main switch, the cancel switch, the set switch, and the resume switch, which is lower in priority than the operated one of the main switch, the cancel switch, the set switch, and the resume switch, is operated as the second switch, the first means for instructing the computer to detect the one of the main switch, the cancel switch, the set switch, and the resume switch in higher priority than the alternative one of the main switch, the cancel switch, the set switch, and the resume switch.

Claim 26

The program product according to claim 21 , further comprising a power supply; a first line; a pull-up resistor connected to the power supply and the first line; a first resistor; a second resistor; a third resistor; and a second line, wherein the main switch has opposing first and second ends, the first end is connected to the power supply via the first line and the pull-up resistor, the other end is connected to ground via the second line, the cancel switch has opposing first and second ends, the first end of the cancel switch is connected to the power supply via the first line, the first resistor and the pull-up resistor, the second end of the cancel switch is connected to the ground via the second line, the set switch has opposing first and second ends, the first end of the set switch is connected to the power supply via the first line, the first resistor, the second resistor, and the pull-up resistor, the second end of the set switch is connected to the ground via the second line, the resume switch has opposing first and second ends, the first end of the resume switch is connected to the power supply via the first line, the first resistor, the second resistor, the third resistor, and the pull-up resistor, the second end of the resume switch is connected to the ground via the second line, the main switch, the cancel switch, the set switch, and the resume switch are prioritized in this order because, even if at least two switches in the main switch, the cancel switch, the set switch, and the resume switch are simultaneously operated, a resistance of a circuit formed between the power supply and the ground is set to be identical to a resistance of the circuit in which one of the at least two switches is only turned on, the one of the at least two switches being located closer to the pull-up resistor than the other thereof, the first means for instructing the computer to detect operations of the plurality of switches based on a signal level on the first line.

Claim 27

A program product according to claim 20 , further comprising: fourth means for instructing the computer to: determine whether to accept an instruction sent from another switch contained in the plurality of switches being operated after the cruise control of the vehicle based on the second instruction is disabled by the computer, the another switch being a switch other than the second switch; and accept the instruction sent from the another switch when it is determined that the instruction is accepted, thus executing cruise control of the vehicle based on the instruction sent from the another switch.

Claim 28

The program product according to claim 20 , wherein the plurality of switches includes a main switch, a cancel switch, a set switch, and a resume switch, the main switch sending, to the computer, an instruction for one of ready and stop of cruise control of the vehicle when operated, the cancel switch sending, to the computer, an instruction for cancel of cruise control of the vehicle when operated, the set switch sending, to the computer, an instruction for start of cruise control of the vehicle at a current speed when operated, the current speed being a speed at a time of the set switch being operated, the resume switch sending, to the computer, an instruction for resuming cruise control of the vehicle at a preset speed, the first switch is one of the main switch and the cancel switch, the second switch is one of the set switch and the resume switch, and the third means is configured to further instruct the computer to, when, during the first switch being operated, the second switch is operated, and when a combination of first and second instructions sent from the detected first and second switches is mismatched with the at least one disallowed combination, execute cruise control of the vehicle based on the second instruction.