Shift Control Device for Vehicle Parking Lock Position Recognition
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Solution Overview
Problem
The existing shift control device for vehicles fails to accurately recognize the initial switching position of the parking lock device upon power restoration, leading to increased time required for the vehicle to begin running, as uncertain switching position information is stored in non-volatile storage, causing discrepancies and requiring additional steps to determine the correct position based on vehicle speed.
Innovation Solution
A shift control device that executes switching position recognizing control by driving the actuator based on preliminary switching position information stored before establishing the running state, allowing for updating of switching position information during the transition from a non-running to a running state, thereby reducing the time needed for the vehicle to begin running and eliminating discrepancies in initial position recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If switching position information is stored in non-volatile storage device, then information is kept when power supply is turned off, but uncertainty occurs when termination fails causing increased time for run-enable operation
Solution Approach 1:
The system performs preliminary wall position detecting control before the run-enable operation to pre-establish accurate switching position information. By detecting wall positions in advance and storing reliable switching position data, the system eliminates the need for time-consuming position determination during the run-enable operation, thus resolving the contradiction between maintaining reliable information retention and reducing operational time loss.
2Measurement precision
If wall position detecting control is executed based on vehicle speed, then switching position can be determined, but additional steps increase time required for run-enable operation
Solution Approach 1:
The system executes wall position detecting control as a preliminary step before the run-enable operation. By detecting wall positions and determining switching positions in advance, the system prepares accurate position information that eliminates the need for additional determination steps during the run-enable operation, thus achieving both precise measurement and reduced time loss.
3Measurement precision
If shift control device waits for switching position recognition, then accurate position control is achieved, but vehicle cannot begin running immediately
Solution Approach 1:
The system performs wall position detecting control and switching position recognition as preliminary actions before the run-enable operation. By completing accurate position recognition in advance, the system ensures precise initial switching position information is available when the vehicle needs to begin running, thus achieving both measurement precision and fast start-up speed.
Data Source
AI summary
It is provided a shift control device for a vehicle having a parking lock device driven by an actuator to selectively switch switching positions between a lock position and an unlock position, wherein when a run-enable operation is made by a driver and a non-running state is switched to a running state, shift position recognizing control is executed for recognizing an initial switching position appearing at the beginning when the running state is established, by driving the actuator in response to switching position information indicative of the switching position on a stage before the running state is established, wherein: the non-running state is configured to be switched to the running state prior to the execution of the run-enable operation; and updating of the switching position information, stored in the switching position information storage device, is permitted to be executed subjected to the switching position recognizing control being executed.