Vehicle Control System Attitude Consistency via Brake Torque
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Solution Overview
Problem
Conventional vehicle attitude control systems cannot maintain consistent control during vehicle turns when the accelerator pedal is not depressed, leading to inconsistent steering reactions and a strange feeling for the driver.
Innovation Solution
A vehicle control system that includes an engine, an accelerator position sensor, and a vehicle attitude control mechanism, which generates deceleration independently of engine torque when the accelerator pedal is not depressed, using a vehicle deceleration generation means such as a brake control system to maintain consistent attitude control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If vehicle attitude control is performed by reducing engine output torque, then vehicle attitude control can be achieved when accelerator pedal is depressed, but vehicle attitude control cannot be performed when accelerator pedal is not depressed
Solution Approach 1:
The patent introduces a vehicle deceleration generation means (independent of engine torque) as an intermediary mechanism to enable attitude control when the accelerator pedal is not depressed. This mediator allows the system to achieve the desired deceleration effect through alternative means (such as brake control system) when the primary method (engine torque reduction) is unavailable, thereby resolving the contradiction between control availability and control consistency.
2Use of energy by moving object
If vehicle attitude control is performed only when accelerator pedal is depressed, then engine torque can be effectively utilized, but steering reaction force varies depending on accelerator operation status
Solution Approach 1:
The patent changes the control parameter from engine torque reduction alone to a conditional dual-mode system. When accelerator pedal is depressed, engine torque is reduced; when accelerator pedal is not depressed, the system switches to vehicle deceleration generation means. This parameter change approach allows the system to adapt its control method based on operating conditions, maintaining consistent steering reaction force while effectively utilizing engine torque when available.
3Productivity
If conventional engine torque reduction method is used, then vehicle attitude control is achieved during acceleration, but control behavior becomes inconsistent during deceleration or idle conditions
Solution Approach 1:
The patent implements a dynamic control system that automatically switches between two control methods based on real-time detection of accelerator pedal status. The system transitions from engine torque reduction mode to vehicle deceleration generation means mode when the accelerator pedal is not depressed, ensuring stable and consistent control behavior across all operating conditions including acceleration, deceleration, and idle states.
Data Source
AI summary
A vehicle control system comprises: an engine (4); an accelerator position sensor (10) configured to detect the position of an accelerator pedal; a steering device; a PCM (14) configured to generate a deceleration in the vehicle to control the attitude of the vehicle, when a steering angle-related value as a parameter related to a steering angle of the steering device increases; and a brake unit (16) configured to generate a deceleration in the vehicle, independently of reduction of an output torque of the engine, wherein the PCM is configured to generates the deceleration by means of the reduction of the output torque of the engine when a depression of the accelerator pedal is detected by the accelerator position sensor, and to generate the deceleration by the brake unit (16) when the depression of the accelerator pedal is not detected by the accelerator position sensor.