HUD Stepper Motor Torque Control for Cold-Start Mirror Alignment
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Solution Overview
Problem
Conventional head up displays (HUDs) experience performance degradation and image misalignment in cold temperatures due to increased mechanical resistance, leading to visibility issues during cold starts, which current solutions like closed loop systems are either expensive or result in audible noise.
Innovation Solution
A temperature-dependent torque control system for the stepper motor in HUDs adjusts the motor's torque based on ambient temperature to maintain accurate mirror positioning without excessive noise, using software to compensate for mechanical resistance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If maximum torque is used at all times to ensure correct mirror position, then positional accuracy is improved, but audible noise increases
Solution Approach 1:
The system dynamically adjusts the stepper motor torque based on real-time temperature feedback from the temperature sensor. The electronic processor modifies torque commands to the motor driver, increasing torque when temperature is low and decreasing it when temperature is high, thereby adapting the system behavior to changing environmental conditions rather than using a fixed maximum torque setting
Solution Approach 2:
The system changes the torque parameter of the stepper motor based on temperature conditions. The electronic processor calculates appropriate torque values according to the detected temperature and transmits adjusted torque commands to the motor driver, allowing the motor to operate with optimal torque at each temperature level rather than constant maximum torque
2Reliability
If high torque is applied to overcome mechanical resistance at low temperatures, then mirror positioning reliability is improved, but audible noise and driver distraction increase
Solution Approach 1:
The system dynamically adjusts the stepper motor torque based on real-time temperature feedback from the temperature sensor. The electronic processor modifies torque commands to the motor driver, increasing torque when temperature is low and decreasing it when temperature is high, thereby adapting the system behavior to changing environmental conditions rather than using a fixed maximum torque setting
Solution Approach 2:
The system uses feedback from the temperature sensor to continuously monitor the thermal environment of the stepper motor. The electronic processor receives temperature data and uses it to adjust torque commands in real-time, creating a closed-loop control system that responds to actual operating conditions rather than relying on predetermined fixed torque values
Data Source
AI summary
A heads up display arrangement for a motor vehicle includes a rotatable mirror positioned to reflect a light field produced by a picture generation unit such that the light field is again reflected by a windshield of the motor vehicle and is then visible to a human driver of the motor vehicle as a virtual image. A stepper motor is coupled to the rotatable mirror and rotates the mirror. A stepper motor driver is coupled to the stepper motor and sets a torque of the stepper motor. A temperature sensor detects a temperature associated with the stepper motor. An electronic processor is communicatively coupled to the temperature sensor and to the stepper motor driver. The electronic processor transmits a signal to the stepper motor driver to set a target torque for the stepper motor. The target torque is dependent upon the detected temperature.