Vehicle Control Device Torque Restoration Dynamics
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Solution Overview
Problem
The responsiveness of torque restoration in vehicle attitude control is deteriorated when switching between all-cylinder and reduced-cylinder operation modes in multi-cylinder engines, leading to uncomfortable driving experiences due to timing differences in cornering force reduction and reaction force restoration.
Innovation Solution
A vehicle control device that adjusts engine torque based on the number of combustion events per unit time, easing the vehicle attitude control-terminating condition as the number of combustion events decreases, thereby reducing delays in torque restoration and maintaining consistent vehicle behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the engine operates in reduced-cylinder mode with longer combustion intervals, then fuel economy is improved, but the responsiveness of torque restoration deteriorates
Solution Approach 1:
The control device dynamically adjusts the vehicle attitude control-terminating condition based on the engine's combustion characteristics. When the engine operates in reduced-cylinder mode with longer combustion intervals, the system dynamically modifies the terminating condition to account for the delayed torque restoration, ensuring responsive vehicle attitude control without sacrificing fuel economy benefits
Solution Approach 2:
The system changes the control parameter (vehicle attitude control-terminating condition) based on the engine operation mode. By detecting whether the engine is in all-cylinder or reduced-cylinder mode, the system adjusts the terminating condition threshold to match the combustion interval characteristics, thereby maintaining optimal responsiveness across different operational states
2Speed
If the vehicle attitude control-terminating condition is set to restore torque quickly, then responsiveness is improved, but inconsistent vehicle behavior occurs when switching between engine operation modes
Solution Approach 1:
The system employs parameter changes by adjusting the vehicle attitude control-terminating condition based on engine operation mode. In all-cylinder mode, a standard terminating condition is used, while in reduced-cylinder mode, the condition is modified to account for longer combustion intervals. This adaptive parameter adjustment ensures both quick torque restoration and consistent vehicle behavior across mode transitions
Solution Approach 2:
The control device incorporates feedback by continuously monitoring engine operation mode and using this information to adjust the vehicle attitude control-terminating condition. This closed-loop approach ensures that the terminating condition always matches the current combustion characteristics, maintaining consistent vehicle behavior regardless of mode switching
Data Source
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AI summary
Disclosed is a vehicle control device which is applied to a vehicle equipped with an engine (10) and an engine torque adjustment mechanism for adjusting an engine torque. The control device comprises a PCM (50) configured, upon satisfaction of a condition that the vehicle is traveling and a steering angle-related value relevant to a steering angle of a steering device is increasing, to control the engine torque adjustment mechanism to reduce the engine torque, so as to execute a vehicle attitude control for generating vehicle deceleration. The PCM (50) is configured, upon satisfaction of a vehicle attitude control-terminating condition for terminating the vehicle attitude control, to control the engine torque adjustment mechanism to restore the engine torque to an original level of torque before the execution of the vehicle attitude control. The PCM (50) is further configured to gradually ease the vehicle attitude control-terminating condition, as the number of times of combustion per unit time in the engine (10) becomes smaller.