Vehicle Shift Controller Actuator Reference Position Setting
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Solution Overview
Problem
The accuracy of setting a reference position for an actuator in a vehicle's shift controller is compromised due to a decrease in drive voltage during reference position setting control, leading to potential inaccuracies in shift position switching control.
Innovation Solution
A shift controller with an electronic control unit that acquires a count value corresponding to the actuator's rotation, sets the reference position when the count value stabilizes, and restarts the setting process if the supply voltage drops below a predetermined level or if the rotation restriction variation exceeds a certain threshold, thereby ensuring accurate torque output and preventing repeated interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If reference position setting control is performed using a common power supply for both the actuator and starter motor, then the vehicle can be powered on with a single power supply system, but the drive voltage to the actuator decreases when the starter motor operates simultaneously, causing inaccurate reference position setting
Solution Approach 1:
The control unit determines whether to perform reference position setting control in advance by checking if the starter motor is operating. When the starter motor is determined to be operating, the control unit prohibits reference position setting control, preventing voltage drop issues before they occur. This preliminary check ensures accurate reference position setting while allowing the use of a common power supply system.
2Measurement precision
If the actuator is driven to output predetermined torque during reference position setting control, then the reference position can be set with high accuracy, but the torque output decreases when supply voltage drops during starter motor operation
Solution Approach 1:
The control unit continuously monitors the operating state of the starter motor and uses this feedback information to determine whether to allow reference position setting control. By detecting starter motor operation status and adjusting the control strategy accordingly, the system ensures that reference position setting is only performed when sufficient voltage is available to maintain predetermined torque output.
3Productivity
If reference position setting control is performed when voltage is low, then the system can operate continuously without interruptions, but the rotational position variation of the actuator increases, leading to low accuracy reference position determination
Solution Approach 1:
The control unit performs a preliminary determination of starter motor operation status before initiating reference position setting control. This advance check prevents the system from entering a low-voltage setting mode, ensuring that reference position setting is only performed when voltage levels are sufficient for accurate determination, thereby maintaining both continuity and accuracy.
Data Source
AI summary
A shift controller for a vehicle includes a shift switching unit, a rotation restricting element, and an electronic control unit. The electronic control unit is configured to: acquire a count value corresponding to a degree of rotation of an actuator; set a rotational position of the actuator when the count value does not change by restricting rotation of the actuator using the rotation restricting element as a reference position of the actuator corresponding to the predetermined shift position; and interrupt setting the reference position of the actuator and restart setting the reference position of the actuator when the rotation of the actuator is restricted and a supply voltage to the actuator is equal to or lower than a predetermined first voltage determination value or a variation in the count value while the rotation of the actuator is restricted is equal to or greater than a predetermined value.