Vehicle Park Control Using Speed-Based Brake and Gear Switching
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Solution Overview
Problem
Existing vehicle control systems with integrated park gear and parking brake switches lack the ability to accurately execute driver intentions, particularly in dynamic scenarios, leading to suboptimal operation and reduced usability.
Innovation Solution
A vehicle control device and method that integrates the operation of the park gear switch and parking brake switch into a single control switch, using vehicle speed and slope detection to determine the appropriate action, ensuring the parking brake is activated at high speeds and the park gear is engaged at low speeds, with hydraulic pressure maintained to prevent vehicle slide on slopes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the park gear switch and parking brake switch are integrated into a single control switch, then driver operations are streamlined and ease of operation is improved, but the ability to operate the parking brake independently is lost and control precision deteriorates
Solution Approach 1:
The control system dynamically changes its behavior based on vehicle speed. At high speeds, the system prioritizes hydraulic braking while keeping the parking brake inactive. At low speeds, the system transitions to activate the parking brake. This dynamic adaptation allows a single switch to provide context-appropriate control, resolving the contradiction between streamlined operation and control precision.
Solution Approach 2:
The system uses vehicle speed as a parameter to determine which braking mechanism to activate. By monitoring the speed parameter and changing control behavior at specific threshold values, the system enables one switch to effectively control different braking functions at different operating conditions, maintaining both ease of operation and control precision.
2Speed
If the parking brake is activated at high vehicle speeds, then the vehicle can be halted quickly, but the driver's actual intention for deceleration may not be accurately executed
Solution Approach 1:
The control system continuously monitors vehicle speed as feedback and uses this information to determine the appropriate braking response. When the vehicle is moving at high speed, the system detects this feedback and activates hydraulic braking instead of the parking brake, ensuring the braking action matches the driver's deceleration intention. At low speeds, the feedback triggers parking brake activation, accurately executing the driver's parking intention.
3Adaptability or versatility
If a dedicated parking brake switch is used, then the parking brake can be activated independently, but the system cannot adapt control behavior based on vehicle speed, reducing productivity
Solution Approach 1:
The single control switch is designed to perform multiple functions: it controls both hydraulic braking at high speeds and parking brake activation at low speeds. This multi-functionality allows the system to adapt control behavior to different vehicle states while maintaining efficient braking response, eliminating the need for separate switches and improving overall system productivity.
Data Source
AI summary
A vehicle control device and method includes: a gear shift member having a parking brake, a drive gear, and a park gear; a hydraulic brake decelerating the vehicle; a vehicle speed detection member; a control switch, which, when pressed, simultaneously activating the parking brake and the park gear; a control member. When the control member determines the vehicle speed exceeds a first threshold during an operation of the control switch, the vehicle remains in a drive gear state, and the hydraulic brake is activated to decelerate the vehicle; when the control member determines the vehicle speed is lower than the first threshold, the vehicle stays in the drive gear state, and the parking brake is activated. When the vehicle speed changes from the first to a second threshold, the hydraulic brake stops operating, the gear shift member shifts to the park gear, and the parking brake is maintained.