Engine Control Device Jerk Optimization
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Solution Overview
Problem
Conventional engine control systems fail to provide a balance between quick acceleration feel and linear acceleration feel, often resulting in excessively high jerk values that are difficult to maintain and predict, leading to a suboptimal driving experience.
Innovation Solution
A control device for an engine that includes a processor to detect accelerator openings and set target accelerations to produce a highest jerk at an accelerator opening 5 to 10% larger than the initial setting, with jerk being fixed within a predetermined range and then gradually reduced, using a quadratic function to extend the period of linear acceleration feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the highest value of the jerk is excessively high, then the quick acceleration feel is improved, but the linear acceleration feel deteriorates and the time period to reach the highest jerk is extended
Solution Approach 1:
The patent applies parameter changes by optimizing the jerk control parameters to achieve a balanced acceleration characteristic. Specifically, the control device adjusts the jerk parameter within a predetermined range to produce a highest jerk value that provides quick acceleration feel while maintaining linear acceleration feel and avoiding excessive extension of the time period to reach the highest jerk.
2Loss of time
If the jerk reaches the highest value quickly, then the quick acceleration feel is improved, but the linear acceleration feel cannot be secured
Solution Approach 1:
The patent changes the jerk parameter within a predetermined range to achieve a balanced acceleration characteristic that provides both quick acceleration feel and linear acceleration feel. The control device optimizes the jerk parameter to produce a highest jerk value that maintains stability of the acceleration composition.
3Stability of the object's composition
If the jerk is kept at a suitable value, then the linear acceleration feel is improved, but the quick acceleration feel deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the jerk control parameters to achieve a balanced acceleration characteristic. The control device adjusts the jerk parameter within a predetermined range to produce a highest jerk value that provides both quick acceleration feel and linear acceleration feel, resolving the contradiction between these two features.
Data Source
AI summary
A control device for an engine 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 accelerator opening detected by the accelerator opening detector, and an engine controller for adjusting an engine torque to achieve the target acceleration set by the target acceleration setter. When the accelerator opening is increased from a state where the target acceleration is set to zero, the target acceleration setter sets the target acceleration according to the accelerator opening to produce a highest jerk in the vehicle at an accelerator opening that is larger by 5 to 10% than an accelerator opening corresponding to the state where the target acceleration is set to zero.