Parking Lock Release Control for Stuck Actuator Conditions
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Solution Overview
Problem
Existing vehicle control devices face challenges in efficiently releasing the parking lock mechanism due to potential delays and the inability to handle engaging surface pressure effectively, especially in situations where the actuator is stuck or the vehicle is tilted.
Innovation Solution
A vehicle control device that includes an actuator drive controller, a main motor drive controller, and a stuck determiner, which uses a rotation angle sensor to detect stuck conditions and performs engaging surface pressure reduction control by driving the main motor to reduce the pressure between the parking gear and lever, ensuring reliable release of the parking lock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the actuator is used to release the parking lock mechanism, then the parking lock can be released, but the actuator may get stuck due to engaging surface pressure between the parking gear and parking lever
Solution Approach 1:
The main motor is driven in advance to reduce the engaging surface pressure between the parking gear and parking lever before the actuator attempts to release the parking lock. This preliminary action removes the harmful pressure that would cause the actuator to stick, ensuring smooth operation of the release mechanism.
Solution Approach 2:
The engaging surface pressure that originally causes the actuator to stick is converted into a beneficial force by using the main motor to apply controlled pressure reduction. The same pressure mechanism that causes the problem is harnessed through reverse control to solve the problem, transforming the harmful factor into a solution.
2Productivity
If the actuator drives the parking lever against engaging surface pressure, then the parking lock can be released, but the actuator experiences increased stress and heat generation
Solution Approach 1:
The main motor applies a counteracting force in advance to reduce the engaging surface pressure before the actuator drives the parking lever. This preliminary anti-action prevents the buildup of excessive stress and heat in the actuator by eliminating the resistive pressure that would otherwise be encountered during the release operation.
3Reliability
If conventional control methods are used without pressure reduction, then the system is simpler, but the parking lock release is delayed and unreliable
Solution Approach 1:
The main motor, which is already part of the vehicle's drive system, is given an additional function of reducing engaging surface pressure for parking lock release. This multi-functionality approach avoids adding a separate dedicated pressure reduction mechanism, thereby maintaining system simplicity while achieving reliable parking lock release.
Data Source
AI summary
A vehicle control device includes: an actuator drive controller configured to control a drive of an actuator; a main motor drive controller configured to control a drive of a main motor; and a stuck determiner. The stuck determiner determines a stuck of the actuator based on a detection value of a sensor unit that detects a physical quantity changed according to a drive state of the actuator. The main motor drive controller is configured to perform an engaging surface pressure reduction control for reducing an engaging surface pressure between a parking gear and a parking lever by driving the main motor, when the stuck determiner determines that the actuator is stuck in releasing a parking lock of the vehicle.