Vehicle Control Device Insulation Protection Priority
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Solution Overview
Problem
Existing vehicle control systems face a trade-off between suppressing dielectric breakdown in rotating electrical machines and maintaining power performance, as reducing the application voltage to prevent breakdown also decreases torque and overall vehicle power.
Innovation Solution
A control device with an electronic control unit that selects operation modes (normal, power, and economy) and prioritizes insulation protection by adjusting transmission gear ratio, application voltage, and torque limitation to prevent dielectric breakdown while minimizing power performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the application voltage to the rotating electrical machine is decreased to suppress dielectric breakdown, then the reliability of the rotating electrical machine is improved, but the power performance of the vehicle is degraded
Solution Approach 1:
The patent applies dynamics by making the transmission gear ratio changeable rather than fixed. The control device dynamically adjusts the gear ratio based on operating conditions to optimize the balance between suppressing dielectric breakdown and maintaining power performance. This allows the system to adapt to varying load and speed conditions, resolving the contradiction between reliability and power output.
Solution Approach 2:
The patent changes physical parameters by adjusting the transmission gear ratio and application voltage based on operating conditions. By modifying these parameters dynamically, the system can suppress dielectric breakdown when necessary while maintaining adequate power performance, thus resolving the technical contradiction between reliability and power.
2Reliability
If the maximum torque of the rotating electrical machine is decreased to prevent dielectric breakdown, then the reliability is improved, but the productivity of the vehicle is degraded
Solution Approach 1:
The patent introduces the transmission gear ratio as an intermediary element between the rotating electrical machine and the driving wheel. By adjusting the gear ratio, the system can compensate for torque limitations imposed by dielectric breakdown prevention measures, thus maintaining vehicle productivity while ensuring reliability. The transmission acts as a mediator that decouples the direct relationship between machine torque and vehicle drive force.
Data Source
AI summary
A control device for a vehicle capable of transmitting power of a rotating electrical machine to a driving wheel by a shift of a transmission, includes: an electronic control unit configured to (i) select, as an operation mode of the rotating electrical machine, a normal mode and a power mode in which the rotating electrical machine is operated such that a vehicle drive force is increased more than the normal mode, (ii) execute insulation protection control of the rotating electrical machine when the electronic control unit determines that dielectric breakdown of the rotating electrical machine occurs, and (iii) set a priority of the insulation protection control in an order of a change in a transmission gear ratio of the transmission, a decrease in an application voltage to the rotating electrical machine, and torque limitation of the rotating electrical machine in a state where the power mode is selected.