Electrical control system for automatic vehicle transmission

Claim 2

In an automatic transmission having means for shifting the gear positions of a vehicle driving system, an electrical control system comprising: converting means for detecting the speed of a vehicle and generating a converted signal, said converted signal having a fixed frequency when the vehicle speed is below a predetermined level and having a frequency proportional to the vehicle speed when the vehicle speed is above the predetermined level, means for setting the vehicle driving condition and for generating a digital signal corresponding to a selected driving condition, means responsive to the movement of an accelerator pedal for generating a throttle position digital signal, and logic operation means connected to receive the converted signal from said converting means and the digital signals from said driving condition setting means and said accelerator pedal responsive means for performing a logic operation and for generating a shift command signal to thereby control the operation of said shifting means.

Claim 3

An electrical control system according to claim 1, wherein said converting means comprises detection means for generating an AC signal having a frequency corresponding to the vehicle speed, and an amplifier converter circuit means connected to receive the AC signal from the detection means for generating a converted signal having a fixed frequency when the frequency of the AC signal is below a predetermined value and having a frequency proportional to the frequency of the AC signal when the frequency of the AC signal is above the predetermined value.

Claim 4

An electrical control system according to claim 1, wherein a resistor is inserted in each of the signal carrying leads connecting said driving condition setting means and said accelerator pedal responsive means to said logic operation means, to thereby protect said logic operation means from being affected by an external electric field.

Claim 5

An electrical control system according to claim 1, wherein said driving condition setting means and said accelerator pedal responsive means include switching means having a contact connected to a grounded terminal, said switching means being operable to generate a digital signal in response to the closing or opening of the contact.

Claim 6

An electrical control system according to claim 1, wherein said logic operation means is integrally constructed in a MOS integrated circuit.

Claim 7

An electrical control system according to claim 1 wherein said logic operation means comprises means responsive to the actuation of an antiskid device for giving priority to an operating condition.

Claim 8

An electrical control system according to claim 1, wherein said logic operation means supplies a control current to said shifting means when shifting is commanded.

Claim 9

In an automatic transmission having means for shifting the gear positions of a vehicle driving system, an electrical control system comprising converting means for detecting the speed of a vehicle and generating a converted signal, said converted signal having a fixed frequency when the vehicle speed is below a predetermined level and having a frequeNcy proportional to the vehicle speed when the vehicle speed is above the predetermined level, reference signal generating means for generating a reference timing signal and a reference sampling signal produced by dividing the frequency of the reference timing signal, means for generating a digital vehicle speed signal by sampling the converted signal from said converting means on the basis of the reference sampling signal from said reference signal generating means, means for setting the vehicle driving condition and for generating a digital signal corresponding to a selected driving condition, means responsive to the movement of an accelerator pedal for generating a throttle position digital signal, shift point setting means connected to said vehicle speed generating means, said driving condition setting means and said accelerator pedal responsive means for combining the digital signals therefrom to generate a shift signal in accordance with a predetermined shift condition, means for generating a time delay signal to relieve shift shock, said time delay signal generating means being adapted to produce a frequency-divided signal by dividing the frequency of the reference timing signal from said reference signal generating means and being adapted to perform a logic operation in response to the frequency-divided signal, the digital signal from said driving condition setting means and the shift signal from said shift point setting means to thereby generate the time delay signal, and means for generating a shift command signal to control the operation of said shifting means, said shift command signal generating means being adapted to perform a logic operation dealing with the time delay signal from said delay signal generating means and the shift signal from said shift point setting means.

Claim 10

In an automatic transmission having means for shifting the gear positions of a vehicle driving system, an electrical control system comprising converting means for detecting the speed of a vehicle and generating a converted signal, said converted signal having a fixed frequency when the vehicle speed is below a predetermined level and having a frequeNcy proportional to the vehicle speed when the vehicle speed is above the predetermined level, reference signal generating means for generating a reference timing signal and a reference sampling signal produced by dividing the frequency of the reference timing signal, means for generating a digital vehicle speed signal by sampling the converted signal from said converting means on the basis of the reference sampling signal from said reference signal generating means, means for setting the vehicle driving condition and for generating a digital signal corresponding to a selected driving condition, means responsive to the movement of an accelerator pedal for generating a throttle position digital signal, shift point setting means connected to said vehicle speed generating means, said driving condition setting means and said accelerator pedal responsive means for combining the digital signals therefrom to generate a shift signal in accordance with a predetermined shift condition, means for generating a time delay signal to relieve shift shock, said time delay signal generating means being adapted to produce a frequency-divided signal by dividing the frequency of the reference timing signal from said reference signal generating means and being adapted to perform a logic operation in response to the frequency-divided signal, the digital signal from said driving condition setting means and the shift signal from said shift point setting means to thereby generate the time delay signal, and means for generating a shift command signal to control the operation of said shifting means, said shift command signal generating means being adapted to perform a logic operation dealing with the time delay signal from said delay signal generating means and the shift signal from said shift point setting means.

Claim 11

An electrical control system according to claim 8, wherein at least said vehicle speed signal generating means, said shift point setting means, said time delay signal generating means and said shift command signal generating means are integrally constructed in a MOS integrated circuit.

Claim 12

An electrical control system according to claim 8, wherein said reference timing signal generating means comprises a piezoelectric vibrating oscillator.

Claim 13

An electrical control system according to claim 8, wherein said shift point setting means comprises a read only memory.

Claim 14

An electrical control system according to claim 8, wherein said time delay signal generating means comprises a read only memory.

Claim 15

An electrical control system according to claim 8, wherein said shift point setting means comprises a circuit means responsive to the actuation of an antiskid device for giving priority to an operating condition.

Claim 16

An electrical control system according to claim 8, wherein said shift command signal generating means supplies a control current to said shifting means when shifting is commanded.

Claim 17

An electrical control system according to claim 8, wherein said converting means comprises detection means for generating an AC signal having a frequency corresponding to the vehicle speed, and an amplifier converter circuit means connected to receive the AC signal from the detection means for generating a converted signal having a fixed frequency when the frequency of the AC signal is below a predetermined value and having a frequency proportional to the frequency of the AC signal when the AC signal frequency is above the predetermined value.

Claim 18

An electrical control system according to claim 18, wherein said driving condition setting means and said accelerator pedal responsive means include switching means having a contact connected to a ground terminal, said switching means being operable to generate a digital signal in response to the closing or opening of the contact.

Claim 19

An electrical control system according to claim 9, wherein resistors are respectively inserted in each of the signal carrying leads connecting said driving cOndition setting means and said accelerator pedal responsive means to said MOS integrated circuit, to thereby protect said logic operation means formed in the MOS integrated circuit from being affected by an external electric field.