Car engine controller

Details Car engine controller Car engine controller

1999-07-08

2001-02-06

Wolfe, Willis R. (Department: 3747)

Internal-combustion engines

Engine speed regulator

Open loop condition responsive

Reexamination Certificate

active

06182635

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a car engine controller.
2. Description of the Prior Art
FIG. 14
is a block diagram of a car engine controller of the prior art disclosed by Japanese Laid-open Patent Application No. 6-2441105. In
FIG. 14
, reference numeral
101
denotes an acceleration opening sensor,
102
an air volume sensor,
103
an engine speed sensor,
104
a measuring unit,
105
a control unit,
106
an engine output control unit in the control unit
105
,
107
a monitoring unit in the control unit
105
,
108
a fuel control unit in the control unit
105
,
109
output means,
110
a throttle actuator,
111
a fault indicator,
112
a fuel injector and “b” a connector.
A description is subsequently given of the operation of the above car engine controller. The accelerator opening sensor
101
detects the opening of an accelerator which is the operation amount of an accelerator stepped on by a driver, converts it into a signal and outputs the converted signal to the engine output control unit
106
and the monitoring unit
107
. The measuring unit
104
outputs momenta such as an engine speed, engine temperature, car speed and gear ratio to the engine output control unit
106
. The engine output control unit
106
computes a throttle drive signal from the opening of the accelerator input from the accelerator opening sensor
101
and the momenta input from the measuring unit
104
and control the throttle actuator
110
through the output means
109
based on the result of computation. The throttle actuator
110
adjusts the opening of the throttle valve of an engine to control the output of the engine. The air volume sensor
102
detects the amount of intake air to be absorbed to the engine side from the throttle valve, converts it into a signal and outputs the converted signal to the fuel control unit
108
. The engine speed sensor
103
detects an engine speed, converts it into a signal and outputs the converted signal to the fuel control unit
108
. The fuel control unit
108
computes the amount of fuel injection from the amount of intake air input from the air volume sensor
102
, the engine speed input from the engine speed sensor
103
and the momenta input from the measuring unit
104
and controls the fuel injector
112
based on the result of computation. The fuel injector
112
injects fuel. The engine is thereby supplied with fuel and air required for combustion to be driven.
The monitoring unit
107
sets a maximum value for a signal indicative of a load on an operation area such as the accelerator operated by the driver according to the opening of the accelerator input from the accelerator opening sensor
101
and compares the maximum value with a load value such as the basic amount of fuel injection from the fuel control unit
108
. When the load value is larger than the maximum value, the monitoring unit
107
judges that a failure occurs and outputs the result of this judgment to the engine output control unit
106
, the fuel injection control unit
108
, the output means
109
and the fault indicator
111
. Thereby, a failure reaction or emergency driving reaction is carried out.
Since the car engine controller of the prior art is constituted as described above, the maximum value of load must be set and there is a possibility that the undesired processing of a failure is carried out according to the setting of the maximum value. The amount of load on the engine is affected by various changing factors such as the temperature and operation states of the engine and exact judgment on a failure may not be made.
It is therefore an object of the present invention to provide a car engine controller which can avoid the undesired processing of a failure by processing without making the driver know the failure even when an abnormal value is computed.
SUMMARY OF THE INVENTION
According to a first aspect of the present invention, there is provided a car engine controller which comprises means of electrically computing a throttle opening from a detected accelerator opening, means of computing a control variable by adding a control value and the detected accelerator opening, and means of controlling a throttle actuator based on the accelerator opening when the accelerator opening is smaller than the control variable and controlling the throttle actuator based on the control variable when the accelerator opening is larger than the control variable.
According to a second aspect of the present invention, there is provided a car engine controller, wherein the control value can be changed by the temperature of an engine.
According to a third aspect of the present invention, there is provided a car engine controller, wherein the control value can be changed by the temperature and burn mode of an engine.
According to a fourth aspect of the present invention, there is provided a car engine controller for controlling a throttle actuator based on a throttle opening which is electrically computed based on a detected accelerator opening and a detected throttle opening, wherein the controller comprises means of switching the burn mode of an engine to a lean burn mode when the difference between the accelerator opening and the throttle opening is large.
According to a fifth aspect of the present invention, there is provided a car engine controller for controlling a throttle actuator based on a throttle opening which is electrically computed based on a detected accelerator opening and a detected throttle opening, wherein the controller comprises means of cutting the fuel of an engine when the difference between the accelerator opening and the throttle opening is large.
According to a sixth aspect of the present invention, there is provided a car engine controller, wherein a plurality of computers forming electrical computing and control means, burn mode switching means, fuel cutting means and the like are provided.
The above and other objects, advantages and features of the present invention will become more apparent from the following description when taken into conjunction with the accompanying drawings.


REFERENCES:
patent: 4335694 (1982-06-01), Mausner et al.
patent: 4453516 (1984-06-01), Filsinger
patent: 4508078 (1985-04-01), Takeuchi et al.
patent: 4519361 (1985-05-01), Murakami
patent: 4729356 (1988-03-01), Kaneko et al.
patent: 5685277 (1997-11-01), Pallett et al.
patent: 5775295 (1998-07-01), Aubourg et al.
patent: 5875762 (1999-03-01), Tsuchiya et al.

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