Variable Accelerator Reaction Force Control for Vehicle Efficiency
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Solution Overview
Problem
Existing accelerator reaction force control systems increase the operational feel uncomfortably for drivers by suddenly enhancing the reaction force at specific thresholds, leading to reduced vehicle acceleration and unsatisfactory fuel consumption, as they fail to balance fuel efficiency with driver intent and vehicle performance.
Innovation Solution
A control apparatus that adjusts the accelerator reaction force based on detected opening degrees and change rates, using variable thresholds that adapt to vehicle speed, driving conditions, and air density, ensuring the reaction force is increased only when necessary to prevent excessive acceleration and maintain fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the reaction force of the accelerator is suddenly increased at a fixed threshold to reduce fuel consumption, then fuel efficiency is improved, but the driver experiences uncomfortable sensation and the vehicle acceleration performance deteriorates
Solution Approach 1:
The patent applies dynamics by making the accelerator threshold value variable rather than fixed. The threshold is dynamically adjusted based on vehicle speed, with higher thresholds at lower speeds and lower thresholds at higher speeds. This dynamic adjustment allows the system to reduce fuel consumption at high speeds while maintaining smooth acceleration and driver comfort at low speeds, resolving the contradiction between energy efficiency and ease of operation.
Solution Approach 2:
The patent changes the parameter of the accelerator threshold value based on vehicle speed conditions. By modifying this critical parameter according to operating conditions, the system achieves optimal balance between fuel economy and driver comfort across different speed ranges, eliminating the uncomfortable sensation while maintaining fuel efficiency benefits.
2Loss of energy
If the reaction force of the accelerator is suddenly increased at a fixed threshold to reduce fuel consumption, then fuel efficiency is improved, but the vehicle acceleration performance deteriorates
Solution Approach 1:
The system dynamically adjusts the accelerator threshold based on vehicle speed, creating a speed-dependent control strategy. At low speeds where acceleration performance is critical, the threshold is set higher to prevent premature reaction force application that would hinder acceleration. At high speeds where fuel economy is more important, the threshold is lowered to enable fuel-saving mode. This dynamic approach resolves the contradiction between energy loss and speed performance.
Solution Approach 2:
The threshold parameter is changed according to vehicle speed conditions, allowing the system to optimize both fuel consumption and acceleration performance across different operating ranges. This parameter adaptation ensures that fuel efficiency improvements do not come at the cost of degraded acceleration capability.
3Device complexity
If a fixed accelerator threshold is used to control reaction force, then the control system is simple, but it cannot adapt to different driving conditions and vehicle speeds
Solution Approach 1:
The patent implements a dynamic threshold control system that adapts to different driving conditions and vehicle speeds. Rather than using a simple fixed threshold, the system continuously adjusts the threshold based on real-time speed information, enabling adaptation to various operating conditions while maintaining reasonable system complexity through the use of speed-based control logic.
Data Source
AI summary
A control apparatus of a vehicle includes a detector to detect an opening degree of an accelerator, a controller to adjust a reaction force of the accelerator, wherein the controller is configured to increase the reaction force of the accelerator when the accelerator opening degree exceeds a threshold value, a first threshold value corresponding to a first vehicle driving force, and a second threshold value corresponding to a second vehicle driving force that is larger than the first vehicle deriving force, wherein the first threshold value is higher than the second threshold value.