Engine Torque Control for Jerk Correlation
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Solution Overview
Problem
Conventional engine control systems prioritize jerk during acceleration but neglect jerk during deceleration, resulting in mismatched acceleration and deceleration feels for the driver, affecting the unity between the driver and the vehicle.
Innovation Solution
A control device that includes a processor to detect accelerator openings, set target accelerations to correlate the characteristics of jerk changes during acceleration and deceleration, and limit jerk changes to prevent excessive deceleration, ensuring the jerk during deceleration matches the jerk during acceleration, thereby improving the driver's feel and vehicle unity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the engine torque is greatly increased to maximize jerk during acceleration, then the acceleration feel is enhanced, but the jerk during deceleration becomes excessive and sharp deceleration occurs
Solution Approach 1:
The patent implements preliminary anti-action by predicting the driver's deceleration intent based on the accelerator opening change rate before excessive jerk occurs. When rapid closure of the accelerator pedal is detected, the system proactively adjusts the target acceleration to limit the jerk during deceleration. This preliminary intervention prevents sharp deceleration and potential vehicle instability while maintaining the ability to deliver strong acceleration when needed, thus resolving the contradiction between enhanced acceleration feel and harmful sharp deceleration.
2Ease of operation
If the target acceleration is set to correlate jerk characteristics during deceleration, then the unity between driver and vehicle is improved, but the response time for acceleration increases
Solution Approach 1:
The patent applies dynamics by making the target acceleration setting adaptive rather than fixed. The system dynamically adjusts the correlation between acceleration and deceleration jerk characteristics based on the actual accelerator opening change rate. When rapid response is needed (high change rate), the system prioritizes responsive acceleration while still maintaining correlated deceleration behavior. This dynamic approach resolves the contradiction between improved unity and increased response time by allowing the system to optimize both aspects in real-time based on driver intent.
Data Source
AI summary
A control device for an engine is provided. The control device includes an accelerator opening detector for detecting an opening of an accelerator, a target acceleration setter for setting a target acceleration of a vehicle based on the detected accelerator opening, and an engine controller for adjusting an engine torque to achieve the set target acceleration. The target acceleration setter sets the target acceleration such that a characteristic of a change of a jerk produced in the vehicle due to a reduction of the accelerator opening correlates to a characteristic of a change of a jerk produced in the vehicle due to an increase of the accelerator opening, the increase of the accelerator opening performed in an early half of a process of acceleration to a constant speed travel of the vehicle, the reduction of the accelerator opening performed in a latter half of the process.