Vehicle Control System for Power Converter Short Circuit Protection
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Solution Overview
Problem
Conventional systems fail to adequately manage particular-phase ON control during vehicle stop periods, leading to excessive electric current flow through the power converter, which is undesirable for part and system protection.
Innovation Solution
A vehicle control system that includes a three-phase AC motor, switching devices, and a power converter, with a short-circuit detector and ECU to determine when the vehicle is stopped and adjust the power converter's state to minimize power consumption and ensure electrical insulation during short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If particular-phase ON control is executed during vehicle stop period, then power consumption is reduced, but excessive electric current flows through the power converter causing potential short circuits
Solution Approach 1:
The ECU determines whether the vehicle is stopped before executing particular-phase ON control. By checking the vehicle stop condition in advance (step S101), the system performs preliminary assessment to avoid executing control that could cause short circuits, thus preventing harmful effects before they occur
Solution Approach 2:
The system continuously monitors vehicle stop conditions and uses this feedback to dynamically adjust whether particular-phase ON control should be executed. The ECU receives feedback about vehicle state and uses it to make real-time decisions about control execution, ensuring safety while maintaining energy efficiency
2Loss of energy
If particular-phase ON control is executed during vehicle stop period, then switching loss of power converter is reduced, but electrical insulation is compromised due to continuous current flow
Solution Approach 1:
The ECU determines whether the vehicle is stopped before executing particular-phase ON control. By checking the vehicle stop condition in advance (step S101), the system performs preliminary assessment to avoid executing control that could cause short circuits, thus preventing harmful effects before they occur
Solution Approach 2:
The system applies preliminary protective measures by checking vehicle stop conditions and avoiding particular-phase ON control execution when it would be harmful. This counter-action prevents the potential short circuit condition before it can develop, protecting the electrical insulation
Data Source
AI summary
A control system for a vehicle including a three-phase AC motor, a first switching device, a second switching device, and a power converter, is provided. The control system includes a short-circuit detector, and an ECU. The ECU is configured to: (a) control the power converter, when it is determined that the vehicle is stopped, so as to place, the power converter in a predetermined condition in which one of the first switching device and the second switching device for all of the three phases is in an OFF state, and (b) control the power converter when the short-circuit detector detects a short circuit in one of the first switching devices and the second switching devices, so that said one of the first and second switching devices in which the short circuit is detected provides the ON state in the predetermined condition.