US 5,625,558 AGranted

Drive-by-wire vehicle engine output control system

AssigneeMitsubishi Jidosha Kogyo Kabushiki Kaisha

InventorsKazuhide Togai, Yoshiaki Danno, Masato Yoshida, Makoto Shimada, Katsunori Ueda

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Abstract

Described herein is a drive-by-wire vehicle engine output control system. The system permits good-response acceleration by a driver's simple and reasonable operation, i.e., by operating an accelerator pedal and also a prompt response even when a sudden load change occurs. Further, the system permits precise speed control by simple equipment even when the deviation of a vehicle speed from a target vehicle speed is large. Output changes of an engine can be controlled within a permissible output change range by (a) comparing a target autocruise engine output with an acceleration demanding ending output, choosing the larger engine output and then controlling the engine to give the larger engine output, (b) controlling the engine to achieve a target autocruise engine output obtained from a speed correction torque and a running load torque or (c) limiting an engine control quantity on the basis of a permissible output change value.

Claims35

Dependent claims

A drive-by-wire vehicle engine output control system for controlling an output of an engine in accordance with a degree of depression of an accelerator pedal by a driver and a mode of operation of a vehicle, comprising:

a vehicle speed detection means for detecting a running speed of the vehicle;
Engine output adjusting means for adjusting the output of the engine;
target engine output setting means for setting, based on the running speed detected by said vehicle speed detection means, a first target value of engine output torque as a target being required to maintain the running speed of the vehicle at a predetermined speed irrespective of depression of said accelerator pedal;
acceleration demand engine output setting means for setting a second target value of engine output torque as an acceleration demand engine output torque, said second target value being required to accelerate the vehicle in accordance with the degree of depression of the accelerator pedal when the accelerator pedal is depressed;
selector means for comparing the target engine output torque set by said target engine output setting means with the acceleration demand engine output torque set by said acceleration demand engine output setting means obtain a greater engine output torque therefrom, and selecting said greater engine output torque as a target engine output torque;
target control quantity setting means for setting a target control quantity for said engine output adjusting means, said target control quantity being required to bring the output torque of the engine close to the target engine output torque selected by said selector means;
and
control means for controlling said engine output adjusting means in accordance with the target control quantity set by said target quantity setting means.

5 more elements

Engine output adjusting means for adjusting the output of the engine;
vehicle speed detection means for detecting a running speed of the vehicle;
target vehicle speed setting means for setting a target vehicle speed upon autocruising in which the running speed of the vehicle is maintained at a predetermined speed;
speed correction torque setting means for determining a deviation of the running speed of the vehicle detected by said vehicle speed detection means from the target vehicle speed set by the target vehicle speed setting means and, based on the deviation, setting a speed correction torque as a correction quantity for a torque to be transmitted via a drive axle of the vehicle, said correction quantity being required to eliminate the deviation;
drive axle torque detection means for detecting an actual torque transmitted via the drive axle;
running load torque detection means for detecting, based on the actual torque transmitted via the drive axle and detected by said drive axle torque detection means, a running load torque which acts as running resistance on the vehicle during running of the vehicle;
target autocruise output setting means for setting a target autocruise engine output as a target value of the engine output, said target value being required to bring the running speed of the vehicle close to the target vehicle speed set by said target vehicle speed setting means on the basis of the speed correction torque set by said speed correction torque setting means and the running load torque detected by said running load torque detection means;
target control quantity setting means for setting a target control quantity for said engine output adjusting means, said target control quantity being required to bring the output of the engine close to the target autocruise engine output set by said target autocruise output setting means;
and
control means for controlling said engine output adjusting means in accordance with the throttle control quantity set by said target control quantity setting means.

7 more elements

Engine output adjusting means for adjusting the output of the engine;
vehicle speed detection means for detecting a running speed of the vehicle;
target engine output setting means for setting, based on the running speed detected by said vehicle speed detection means, a first target value of engine output as a target autocruise engine output, said first target value being required to maintain the running speed of the vehicle at a predetermined speed;
permissible output change setting means for setting a permissible range of output changes for the engine;
and
control means for controlling said engine output adjusting means in accordance with the permissible range of output set by said permissible output change setting means and the target autocruise engine output set by said target engine output setting means, whereby an output of the engine is adjusted within the permissible range of output changes to bring the output of the engine close to the target autocruise engine output.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/313,390Filed 27 Sep 1994 · continuation
Priority: JP 2-33194229 Nov 1990
Granted: 29 Apr 1997
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

B60K 31/047
In a memory, e.g. a capacitor: the memory being digital
F02D 11/105
Of the electric type: characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal…
F02D 31/001
Use of speed-sensing governors to control combustion engines, not otherwise provided for: electric control of rotation speed
B60W 2050/001
Feedback, closed loop systems or details of feedback error signal: proportional integral [PI] controller