Vehicle Control Device Acceleration Mode Switching
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Solution Overview
Problem
The existing vehicle control devices complicate the calculation of target drive force during acceleration by using correction amounts rather than maps, making it difficult to easily set the target drive force.
Innovation Solution
A vehicle control device that includes a target drive force setting unit based on vehicle speed and accelerator opening degree, a target speed ratio setting unit for continuously variable transmission, and a target torque setting unit, with mode switching to simplify the calculation of target drive force during acceleration by using a map-based approach.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the target drive force is calculated by adding correction amounts (running resistance, accelerator depression correction value, vehicle speed change correction value) rather than using a map, then the acceleration requirement can be met, but the calculation becomes complicated
Solution Approach 1:
The patent uses a map that stores pre-calculated target drive force values based on vehicle speed and accelerator opening degree. Instead of performing complex real-time calculations with multiple correction amounts, the system copies the appropriate target drive force value directly from the map, significantly simplifying the calculation process while maintaining accuracy for acceleration requirements
Solution Approach 2:
The target drive force values and correction amounts are pre-calculated and stored in a map during system design or initialization. This preliminary action allows the runtime system to simply retrieve and apply stored values rather than performing complex calculations in real-time, reducing computational complexity while ensuring acceleration requirements are met
2Ease of operation
If the target drive force is set using a map during normal operation, then the control is simple, but the acceleration performance may not be sufficient
Solution Approach 1:
The patent dynamically switches between two control modes: normal mode (using simple map-based control) and acceleration requirement mode (using map-based control with acceleration-optimized parameters). The mode switching unit determines which mode to use based on current operating conditions, allowing the system to maintain simplicity during normal operation while achieving sufficient acceleration performance when needed
Solution Approach 2:
The patent applies different control strategies to different operating conditions. During acceleration events, the system uses a specialized acceleration requirement mode with specific correction values and map parameters optimized for acceleration, while using standard map-based control for normal cruising conditions. This localized optimization ensures acceleration performance without compromising overall control simplicity
3Speed
If the vehicle speed increases during acceleration, then the vehicle moves forward, but the target drive force decreases according to the map
Solution Approach 1:
The patent applies an accelerator depression correction value that anticipates and compensates for the natural decrease in target drive force as vehicle speed increases. When acceleration is detected, this correction value prevents the target drive force from decreasing according to the standard map, maintaining sufficient force to sustain acceleration despite increasing vehicle speed
Solution Approach 2:
The system continuously monitors vehicle speed and acceleration status, and uses this feedback to adjust the target drive force calculation. When acceleration is detected through the acceleration requirement determination unit, the feedback mechanism triggers the application of acceleration-specific correction values that maintain appropriate drive force levels despite speed increases
Data Source
AI summary
A vehicle control device that sets a target drive force based on a vehicle speed and an accelerator opening degree, in which if a running mode is switched from a normal mode to an acceleration requirement mode, the target drive force is set based on the accelerator opening degree and the vehicle speed at the time of mode switching.