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Dynamic protection system for power terminal of vehicle electric drive system

A technology for electric drive and protection systems, applied in the control system, vector control system, motor generator control, etc., can solve the problems of limiting the system output capacity and affecting the power performance of the vehicle, so as to maximize the dynamic output capacity and realize the Effect of thermal protection function

Active Publication Date: 2021-07-27
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the system operating current is greater than the continuous current, the accumulation of the I2t value is easy to calculate, but when the system current is less than the continuous current, the reduction of the I2t value is difficult to grasp. In order to ensure a safety margin, a conservative plan is generally adopted, which will limit The output capability of the system affects the power performance of the vehicle

Method used

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  • Dynamic protection system for power terminal of vehicle electric drive system
  • Dynamic protection system for power terminal of vehicle electric drive system
  • Dynamic protection system for power terminal of vehicle electric drive system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1. In this example, the proportion of the heat of the electric drive system dissipating to the ambient air is small, and the influence of the ambient air on the heat can be ignored.

[0030] The specific steps of the power terminal dynamic protection system of the vehicle electric drive system are as follows:

[0031] 1. The loss calculation module 4 acquires the real-time AC and DC current signals of the inverter 2 . The real-time AC and DC current signals of the inverter 2 are obtained by sensor measurement or calculation by the formula P=UI, P is power, U is voltage, I is current, known voltage and power can be calculated for current or known current and power Voltage can be solved for.

[0032] 2. The loss calculation module 4 calculates and outputs loss power according to real-time AC and DC current signals.

[0033] 3. The temperature calculation module 5 calculates and outputs the current temperature of the busbar and wire harness according to the ob...

Embodiment 2

[0043] Embodiment 2, in this example, the heat of the electric drive system diffuses to the ambient air in a relatively large proportion.

[0044] The specific steps of the power terminal dynamic protection system of the vehicle electric drive system are as follows:

[0045] 1. The loss calculation module 4 acquires the real-time AC and DC current signals of the inverter 2 . The real-time AC and DC current signals of the inverter 2 are obtained by sensor measurement or calculation by the formula P=UI, P is power, U is voltage, I is current, known voltage and power can be calculated for current or known current and power Voltage can be solved for.

[0046] 2. The loss calculation module 4 calculates and outputs loss power according to real-time AC and DC current signals.

[0047] 3. The temperature calculation module 5 calculates and outputs the current temperature of the busbar and wire harness according to the obtained power loss.

[0048] see Figure 4 , establish a topo...

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Abstract

The invention relates to the technical field of vehicle electric drive systems, in particular to a dynamic protection system for a power terminal of a vehicle electric drive system. The system comprises a loss calculation module, a temperature calculation module, a derating control module and a current control module. The loss calculation module obtains the real-time alternating current and direct current signals of an inverter, and calculates and outputs the loss power, the temperature calculation module calculates and outputs the current temperatures of a busbar and a wire harness, the derating control module compares the obtained current temperatures with a set derating temperature threshold value and an over-temperature threshold value, the current control module calculates and outputs an inverter current adjustment value, and the inverter changes the alternating current and direct current, so that the temperature of the busbar is controlled. Compared with the prior art, a topological structure based on temperature nodes is established, the current temperature of the busbar and the current temperature of the wiring harness are calculated on line, dynamic derating is carried out to limit the current output of the inverter, so that the over-temperature protection function of the electric drive system is achieved, and the dynamic output capacity of the system can be maximized.

Description

technical field [0001] The invention relates to the technical field of electric drive systems for vehicles, in particular to a dynamic protection system for power terminals of electric drive systems for vehicles. Background technique [0002] see figure 1 , the vehicle electric drive system generally includes a power supply 1 , an inverter 2 , and a motor 3 . The power supply 1, the inverter 2, and the motor 3 are connected through a busbar 8 and a wiring harness 9. The high-voltage current generated by the power supply enters the DC busbar through the DC wiring harness, and then flows out through the AC busbar after being converted by the power module inside the inverter. The current then enters the motor busbar through the AC wiring harness, and then enters the motor stator winding. For the integrated electric drive system such as e-Alex, the system can omit the high-voltage wiring harness because the inverter and the motor are integrated in one structure. [0003] At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/22H02P27/08
CPCH02P21/22H02P27/08Y02T10/72
Inventor 黄宜坤王宇
Owner UNITED AUTOMOTIVE ELECTRONICS SYST
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