Motor Control Apparatus Temperature-Based Climb Correction
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Solution Overview
Problem
The existing motor control systems for electric motors in automatic transmissions face accuracy issues due to torque changes caused by temperature variations, leading to reduced position change accuracy in control subjects.
Innovation Solution
A motor control apparatus that includes delimiting position learning, climb correction amount setting, reference position learning, target position setting, and motor temperature information determining means to adjust for torque changes by sensing and correcting for motor temperature, thereby improving position change accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the motor is rotated beyond the delimiting position during abutment control operation, then the play in the rotation transmission system can be compensated, but the exceeding rotational angle increases as the torque of the motor increases, reducing position accuracy
Solution Approach 1:
The patent changes the control parameter from fixed target position to dynamic target position that varies with torque. The ECU determines torque based on current value and rotates the motor to a target position that compensates for torque-induced exceeding rotational angle, thereby maintaining position accuracy across varying torque conditions
Solution Approach 2:
The system implements feedback by detecting the actual rotational angle during abutment control operation, comparing it with the target rotational angle, and using the difference (exceeding rotational angle) to determine the appropriate target position for subsequent operations. This feedback loop ensures accurate position control despite torque variations
2Measurement precision
If the target position is corrected using climb correction amount based on electric power source voltage, then the exceeding rotational angle can be compensated, but position change accuracy is reduced when torque changes due to motor temperature variations
Solution Approach 1:
The patent extends the correction approach by introducing temperature as an additional parameter. The ECU determines torque based on current value and accounts for temperature-induced torque changes, adjusting the target position accordingly. This dual-parameter approach (torque current + temperature) enables accurate position control across varying operating conditions
Solution Approach 2:
The system transitions from static correction (fixed climb correction amount based on voltage) to dynamic correction (adaptive target position based on real-time torque and temperature). The ECU continuously adjusts the target position according to current torque value and temperature conditions, making the system adaptable to changing operational environments
Data Source
AI summary
A P-range side delimiting position of a movable range of a range change mechanism is learned by rotating a motor to a corresponding rotational position, which corresponds to the P-range side delimiting position. A climb correction amount is set for a learning value of the P-range side delimiting position to correct the learning value of the P-range side delimiting position in view of presence of a relatively small angle of rotation of the motor beyond the corresponding rotational position, which corresponds to the P-range side delimiting position. The climb correction amount is set according to motor temperature information, which is one of a temperature of the motor and a temperature that relates to the temperature of the motor.