Vehicle Parking Lock Control Device Speed-Based Inhibition
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Solution Overview
Problem
Existing parking lock mechanisms often switch to a parking lock state unintentionally due to driver door operations, especially when the vehicle speed exceeds a predetermined speed, leading to potential issues with the driver's ability to exit the vehicle.
Innovation Solution
A control device with a manual operation parking lock control unit, a door operation parking lock control unit, a parking lock inhibition unit, a parking lock rejection history storage unit, and a parking lock permission unit that inhibit parking lock operations when vehicle speed exceeds a predetermined threshold and store rejection history, allowing intentional door operations to switch the mechanism to a parking lock state only when the vehicle is at or below the predetermined speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the door operation parking lock control unit switches the parking lock mechanism to a parking lock state based on door operation, then the driver is prevented from exiting in non-parking lock state, but unintended switching to parking lock state occurs during low-speed operations such as car wash
Solution Approach 1:
The system dynamically adjusts the parking lock control logic based on vehicle speed conditions. At low speeds (V ≤ Vo), the door operation parking lock control is enabled to prevent unintended exits, while at high speeds (V > Vo), the control is disabled to prevent unintended parking lock switching during maneuvers like car wash operations. This dynamic switching of control modes resolves the contradiction between safety and operational flexibility.
2Ease of operation
If the parking lock operation is inhibited when vehicle speed exceeds predetermined speed, then unintended parking lock switching is suppressed, but the parking lock rejection history must be stored and managed
Solution Approach 1:
The system performs preliminary inhibition of the parking lock operation when vehicle speed exceeds the predetermined threshold Vo. The parking lock rejection history storage unit proactively records these inhibition events, and the parking lock permission unit later permits parking lock operation when the stored rejection history indicates previous inhibitions. This preliminary action approach prevents unintended switching while managing the complexity through structured history tracking.
Data Source
AI summary
According to a parking lock control computer, in a case where there is a switching request from a non-parking lock state of a parking lock mechanism to a parking lock state based on a driver's manual operation of a P switch or a vehicle power switch, the P switch or the vehicle power switch is operated in a state where a vehicle speed V exceeds a P lock permissible vehicle speed Vp, a parking lock operation is inhibited, and a parking lock rejection history is stored, switching to the parking lock state of the parking lock mechanism by a door opening operation is permitted.