Engine Control Device for Constant Acceleration Response
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Solution Overview
Problem
Conventional engine control systems struggle to maintain constant vehicle speed when the driver operates the accelerator pedal slightly and repeatedly, especially in scenarios like roundabouts or limited speed zones, due to varying acceleration changes with accelerator opening and vehicle operating states.
Innovation Solution
A control system for the engine that includes an accelerator opening acquiring module, a target acceleration setting module, and an engine control module, which sets a target acceleration corresponding to the accelerator opening within a predetermined range to maintain constant acceleration change regardless of vehicle state, ensuring consistent vehicle speed across different gear positions and speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the target acceleration is set to cause higher acceleration feeling and reduce vibration, then the acceleration performance is improved, but the vehicle speed becomes difficult to keep constant
Solution Approach 1:
The patent applies parameter changes by modifying the target acceleration setting based on accelerator opening range. Within the predetermined range including the value where target acceleration becomes zero, the system sets the target acceleration to cause substantially constant change with respect to accelerator opening change, regardless of operating state. This parameter adjustment resolves the contradiction by enabling both good acceleration performance outside the range and stable speed control within the range.
2Ease of operation
If the accelerator pedal is operated slightly and repeatedly to maintain constant vehicle speed, then the speed control intention is expressed, but the acceleration varies according to accelerator opening variation making it difficult to keep speed constant
Solution Approach 1:
The system changes the parameter relationship between accelerator opening and target acceleration within the predetermined range. By setting the target acceleration to cause substantially constant change regardless of operating state (gear position, vehicle speed), the system makes the acceleration response predictable and uniform. This allows drivers to easily control vehicle speed through slight accelerator operations without experiencing unpredictable acceleration variations.
3Adaptability or versatility
If the acceleration changes with respect to accelerator opening vary depending on operating state, then the control adapts to different conditions, but it becomes further difficult to keep vehicle speed constant
Solution Approach 1:
The patent applies local quality by creating different control characteristics for different accelerator opening ranges. Within the predetermined range including the zero target acceleration point, the system provides uniform acceleration change characteristics regardless of operating state. Outside this range, the system allows acceleration characteristics to vary according to operating state. This local differentiation resolves the contradiction by providing both adaptability outside the range and stability within the range.
Data Source
AI summary
A control system for an engine is provided. The control system includes an accelerator opening acquiring module for acquiring an opening of an accelerator, a target acceleration setting module for setting a target acceleration of a vehicle based on the accelerator opening acquired by the accelerator opening acquiring module, and an engine control module for adjusting an engine torque to achieve the target acceleration set by the target acceleration setting module. Within a predetermined range of the accelerator opening, the target acceleration setting module sets the target acceleration corresponding to the accelerator opening acquired by the accelerator opening acquiring module, to cause a change of the target acceleration with respect to a change of the accelerator opening to be substantially constant regardless of an operating state of the vehicle, the predetermined range including a value of the accelerator opening at which the target acceleration becomes zero.