Vehicle Motor Control Device Phase Temperature Torque Management
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Solution Overview
Problem
Existing vehicle motor control devices reduce torque based on indicative or maximum temperature, leading to reduced driving performance as they do not effectively manage current distribution across phases, resulting in restricted motor torque and impaired vehicle mobility, especially when stalled.
Innovation Solution
A control device that includes temperature sensors to detect the temperature of each coil phase and a controller to adjust torque based on the current phase angle, reducing torque when a selected temperature exceeds a restrictive threshold, thereby optimizing torque distribution across phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If torque is reduced based on maximum detected temperature, then phase temperature protection is improved, but driving performance is reduced due to excessive torque restriction
Solution Approach 1:
The patent applies local quality by monitoring and controlling temperature specifically for the current phase carrying concentrated current, rather than using a blanket maximum temperature approach. This allows targeted protection of the overheating phase while maintaining full torque capability in other phases that are not overheating, thus resolving the contradiction between reliability and driving performance.
2Reliability
If torque is reduced based on indicative torque regardless of phase temperature, then current concentration prevention is improved, but driving performance is reduced due to unnecessary torque reduction
Solution Approach 1:
The patent changes the control parameter from indicative torque to actual phase temperature. By using temperature as the controlling parameter and comparing it against a threshold, the system can make precise decisions about torque reduction only when actually needed, avoiding unnecessary torque reduction and maintaining driving performance while still preventing current concentration damage.
3Reliability
If torque is reduced when stalled time exceeds allowed time, then motor protection is improved, but vehicle mobility is reduced due to delayed response
Solution Approach 1:
The patent applies preliminary action by monitoring phase temperature continuously and proactively, before the stalled time threshold is exceeded. When the temperature approaches the threshold, the system prepares for potential torque reduction. This early detection and preparation allows for smoother, more timely response that protects the motor while minimizing impact on vehicle mobility.
Data Source
AI summary
A control device of a vehicle motor includes a temperature sensor that detects a temperature of each coil, each coil supplying an alternating current to a corresponding phase of the motor and a controller that controls a torque of the vehicle motor; detects a stalled state of a vehicle; detects a current phase angle of the vehicle motor; and selects one of the temperatures detected by the temperature sensor based on a detected current phase angle, wherein the torque of the vehicle motor is reduced when the stalled state of the vehicle is detected and when a selected temperature exceeds a restrictive temperature.