Engine control system

Claim 2

A control apparatus of an engine for controlling a throttle valve opening degree in response to a demand output of a driver, the engine having at least one cylinder, an intake pipe connected to the cylinder, a throttle valve disposed in the intake pipe, a throttle actuator for actuating the throttle valve and an injector for supplying fuel to the engine, the apparatus comprising: means, responsive to the demand output, for setting a target charged intake air amount of air taken into the cylinder per intake stroke; means, based on an air pressure generated at an upstream side of the throttle valve, for setting the maximum actual charged intake air amount as the maximum value of an actual charged intake air amount taken into the cylinder per intake stroke; means for normalizing the target charged intake air amount by calculating a ratio of the target charged intake air amount to the maximum actual charged intake air amount; means for setting the throttle valve opening degree based on the normalized target charged intake air amount and an engine speed; and means for outputting a signal for actuating the throttle valve to the throttle actuator so that the throttle valve has the opening degree set by the throttle valve opening degree setting means.

Claim 3

An apparatus according to claim 1, further comprising: means for setting a fuel injection amount based on the target charged intake air amount; and means for driving the injector so that the fuel injection amount set by the fuel injection amount setting means is supplied to the engine.

Claim 4

An apparatus according to claim 2, further comprising means for setting an air amount corresponding to a delay due to fuel adhering to an inner-wall of an intake port of the engine during one cycle of the cylinder by means of a fuel adhering delay compensating model based on the engine speed and the target charged intake air amount, thus compensating for the target charged intake air amount using the air amount corresponding to the delay.

Claim 5

An apparatus according to claim 2, further comprising: means for setting an actual charged intake air amount taken into the cylinder per intake stroke based on an intake port air pressure generated at a downstream side of the throttle valve:; and means for limiting the target charged intake air amount so that the target charged intake air amount does not increase more than an upper limiting value set based on the actual charged intake air amount, the engine speed and a predetermined maximum engine speed.

Claim 6

An apparatus according to claim 3, further comprising: means for setting an actual charged intake air amount taken into the cylinder per intake stroke based on an intake port air pressure generated at a downstream side of the throttle valve:; and means for limiting the target charged intake air amount so that the target charged intake air amount does not increase more than an upper limiting value set based on the actual charged intake air amount, the engine speed and a predetermined maximum engine speed, wherein the air amount corresponding to the delay is added to the upper limiting value when the air amount corresponding to the delay is a positive value.

Claim 7

An apparatus according to claim 2, further comprising: means for setting an actual charged intake air amount taken into the cylinder per intake stroke based on an air pressure generated at a downstream side of the throttle valve:; and means for limiting the target charged intake air amount so that the target charged intake air amount does not decrease less than a lower limiting value set based on the actual charged intake air amount and the engine speed.

Claim 8

An apparatus according to claim 3, further comprising: means for setting an actual charged intake air amount taken into the cylinder per intake stroke based on an intake port air pressure generated at a downstream side of the throttle valve:; and means for limiting the target charged intake air amount so that the target charged intake air amount does not decrease less than a lower limiting value set based on the actual charged intake air amount and engine speed, wherein the air amount corresponding to the delay is added to the lower limiting value when the air amount corresponding to the delay is a negative value.

Claim 9

An apparatus according to claim 2, further comprising means for executing a dead time process, the dead time being corresponding to a delay in actuating the throttle valve by the actuator in response to the target charged intake air amount.

Claim 10

A control apparatus of an engine for controlling a throttle valve opening degree in response to a demand output of a driver, the engine having at least one cylinder, an intake pipe connected to the cylinder, a throttle valve disposed in the intake pipe, a throttle actuator for actuating the throttle valve and an injector for supplying fuel to the engine, the apparatus comprising: means, responsive to the demand output, for setting a target charged intake air amount of air taken into the cylinder per intake stroke; means, based on an air pressure generated at a downstream side of the throttle valve, for setting an actual charged intake air amount taken into the cylinder per intake stroke; means, responsive at least to the target and actual charged intake air amounts, for calculating, using a reverse chamber model, a throttle valve opening degree required for equalizing the target charged intake air amount and an actual charged intake air amount taken into the cylinder after an elapse of a minute period; and means for outputting a signal for actuating the throttle valve to the throttle actuator so that the throttle valve has the calculated opening degree.

Claim 11

A control apparatus of an engine for controlling a throttle valve opening degree in response to a demand output of a driver, the engine having at least one cylinder, an intake pipe connected to the cylinder, a throttle valve disposed in the intake pipe, a throttle actuator for actuating the throttle valve and an injector for supplying fuel to the engine, the apparatus comprising: means, responsive to the demand output, for setting a target charged intake air amount of air taken into the cylinder per intake stroke; means, based on an air pressure generated at a downstream side of the throttle valve, for setting an actual charged intake air amount taken into the cylinder per intake stroke; means, responsive at least to the target and actual charged intake air amounts, for calculating, using a reverse chamber model, a throttle valve opening degree required for equalizing the target charged intake air amount and an actual charged intake air amount taken into the cylinder after an elapse of a minute period; and means for outputting a signal for actuating the throttle valve to the throttle actuator so that the throttle valve has the calculated opening degree.

Claim 12

An apparatus according to claim 9, further comprising: means for setting a fuel injection amount based on the target charged intake air amount; and means for driving the injector so that the fuel injection amount set by the fuel injection amount setting means is supplied to the engine.

Claim 13

An apparatus according to claim 10, further comprising means for setting an air amount corresponding to a delay due to fuel adhering to an inner-wall of an intake port of the engine during one cycle of the cylinder by means of a fuel adhering delay compensating model based on the engine speed and the target charged intake air amount, thus compensating for the target charged intake air amount using the air amount corresponding to the delay.

Claim 14

An apparatus according to claim 10, further comprising means for limiting the target charged intake air amount so that the target charged intake air amount does not increase more than an upper limiting value set based on the actual charged intake air amount, the engine speed and a predetermined maximum engine speed.

Claim 15

An apparatus according to claim 11, further comprising means for limiting the target charged intake air amount so that the target charged intake air amount does not increase more than an upper limiting value set based on the actual charged intake air amount, the engine speed and a predetermined maximum engine speed, wherein the air amount corresponding to the delay is added to the upper limiting value when the air amount corresponding to the delay is a positive value.

Claim 16

An apparatus according to claim 10, further comprising means for limiting the target charged intake air amount so that the target charged intake air amount does not decrease less than a lower limiting value set based on the actual charged intake air amount and the engine speed.

Claim 17

An apparatus according to claim 11, further comprising means for limiting the target charged intake air amount so that the target charged intake air amount does not decrease less than a lower limiting value set based on the actual charged intake air amount and engine speed, wherein the air amount corresponding to the delay is added to the lower limiting value when the air amount corresponding to the delay is a negative value.

Claim 18

An apparatus according to claim 10, further comprising means for executing a dead time process, the dead time being corresponding to a delay in actuating the throttle valve by the actuator in response to the target charged intake air amount.

Claim 19

A control apparatus of an engine for controlling a throttle valve opening degree in response to a demand output of a driver, the engine having at least one cylinder, an intake pipe connected to the cylinder, a throttle valve disposed in the intake pipe, a throttle actuator for actuating the throttle valve and an injector for supplying fuel to the engine, the apparatus comprising: means, responsive to the demand output, for setting a target charged intake air amount of air taken into the cylinder per intake stroke; means, based on an air pressure generated at a downstream side of the throttle valve, for setting an actual charged intake air amount taken into the cylinder per intake stroke; means, based on an air pressure generated at an upstream side of the throttle valve, for setting the maximum charged intake air amount as the maximum value of an actual charged intake air amount taken into the cylinder per intake stroke; means for setting the throttle valve opening degree based on an intake air ratio and an engine speed indicating value, the intake air ratio being a ratio of a mean value of the target charged intake air amount and the actual charged intake air amount to the maximum charged intake air amount, the engine speed indicating value being calculated by adding an engine speed and an increment or a decrement of the engine speed based on the target charged intake air amount and the actual charged intake air amount; and means for outputting a signal for actuating the throttle valve to the throttle actuator so that the throttle valve has the opening degree set by the throttle valve opening degree setting means.

Claim 20

A control apparatus of an engine for controlling a throttle valve opening degree in response to a demand output of a driver, the engine having at least one cylinder, an intake pipe connected to the cylinder, a throttle valve disposed in the intake pipe, a throttle actuator for actuating the throttle valve and an injector for supplying fuel to the engine, the apparatus comprising: means, responsive to the demand output, for setting a target charged intake air amount of air taken into the cylinder per intake stroke; means, based on an air pressure generated at a downstream side of the throttle valve, for setting an actual charged intake air amount taken into the cylinder per intake stroke; means, based on an air pressure generated at an upstream side of the throttle valve, for setting the maximum charged intake air amount as the maximum value of an actual charged intake air amount taken into the cylinder per intake stroke; means for setting the throttle valve opening degree based on an intake air ratio and an engine speed indicating value, the intake air ratio being a ratio of a mean value of the target charged intake air amount and the actual charged intake air amount to the maximum charged intake air amount, the engine speed indicating value being calculated by adding an engine speed and an increment or a decrement of the engine speed based on the target charged intake air amount and the actual charged intake air amount; and means for outputting a signal for actuating the throttle valve to the throttle actuator so that the throttle valve has the opening degree set by the throttle valve opening degree setting means.

Claim 21

An apparatus according to claim 17, further comprising: means for setting a fuel injection amount based on the target charged intake air amount; and means for driving the injector so that the fuel injection amount set by the fuel injection amount setting means is supplied to the engine.

Claim 22

An apparatus according to claim 18, further comprising means for setting an air amount corresponding to a delay due to fuel adhering to an inner-wall of an intake port of the engine during one cycle of the cylinder by means of a fuel adhering delay compensating model based on the engine speed and the target charged intake air amount, thus compensating for the target charged intake air amount using the air amount corresponding to the delay.

Claim 23

An apparatus according to claim 18, further comprising means for limiting the target charged intake air amount so that the target charged intake air amount does not increase more than an upper limiting value set based on the actual charged intake air amount, the engine speed and a predetermined maximum engine speed.

Claim 24

An apparatus according to claim 19, further comprising means for limiting the target charged intake air amount so that the target charged intake air amount does not increase more than an upper limiting value set based on the actual charged intake air amount, the engine speed and a predetermined maximum engine speed, wherein the air amount corresponding to the delay is added to the upper limiting value when the air amount corresponding to the delay is a positive value.

Claim 25

An apparatus according to claim 18, further comprising means for limiting the target charged intake air amount so that the target charged intake air amount does not decrease less than a lower limiting value set based on the actual charged intake air amount and the engine speed.

Claim 26

An apparatus according to claim 19, further comprising means for limiting the target charged intake air amount so that the target charged intake air amount does not decrease less than a lower limiting value set based on the actual charged intake air amount and engine speed, wherein the air amount corresponding to the delay is added to the lower limiting value when the air amount corresponding to the delay is a negative value.

Claim 27

An apparatus according to claim 18, further comprising means for executing a dead time process, the dead time being corresponding to a delay in actuating the throttle valve by the actuator in response to the target charged intake air amount.