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Load drive device, vehicle, and abnormality processing method in load drive device

A load driving and abnormal handling technology, applied in the arrangement of multiple different prime movers of power plants, hybrid vehicles, and general power plants, etc., can solve the problems of voltage rise, inability to suppress voltage increase, inability to prevent overvoltage, etc.

Active Publication Date: 2007-04-25
DENSO CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the aforementioned Japanese Patent Application Laid-Open No. 2003-111203 discloses a scheme for suppressing voltage fluctuations in the power supply system, as described above, this scheme may not prevent the reversal caused by the sudden drop in the motor torque. Overvoltage on the input side of the transformer
Since the voltage on the input side of the inverter starts to rise at the same time that the motor torque suddenly starts to drop, the scheme disclosed in Japanese Patent Application Laid-Open No. 2003-111203 may not be able to suppress the The voltage increase that occurs during the period from the onset of the sudden drop until switching the direction of transmission of the converter
There is a possibility that the occurrence of overvoltage cannot be prevented

Method used

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  • Load drive device, vehicle, and abnormality processing method in load drive device
  • Load drive device, vehicle, and abnormality processing method in load drive device
  • Load drive device, vehicle, and abnormality processing method in load drive device

Examples

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no. 1 example

[0052] FIG. 1 is a functional block diagram of a hybrid vehicle considered as an example of a vehicle in which a load driving apparatus according to a first embodiment of the present invention is included. 1, the hybrid vehicle 100 includes a battery B, a booster 10, inverters 20 and 30, an ECU (Electronic Control Unit) 40, motor generators MG1 and MG2, an engine ENG, a transmission TM, drive wheels DW, Capacitors C1 and C2, voltage sensors 52 and 54, rotation speed sensors 56 and 58, power supply lines PL1 and PL2, ground line SL, U-phase lines UL1 and UL2, V-phase lines VL1 and VL2, and W-phase lines WL1 and WL2.

[0053] Motor generators MG1 and MG2 are rotary electric machines, and are composed of 3-phase AC (Alternating Current) synchronous motor generators. Motor generator MG1 generates a 3-phase AC voltage using the power of engine ENG to supply the generated 3-phase AC voltage to inverter 20 . Motor generator MG1 also generates driving force by the 3-phase AC voltage ...

no. 2 example

[0096] Even when excessive rotation of motor generator MG2 occurs and thus torque reduction control of motor generator MG2 is performed, if motor generator MG1 is currently stopped or in power supply operation, the voltage VM reflecting the torque reduction control of motor generator MG2 Increase will not occur. In the second embodiment, when over-rotation of motor generator MG2 occurs, the boosting ratio of booster 10 will be maintained without being reduced if motor generator MG1 is currently shutting down or in feed running operation. In the second embodiment, the limit value of the number of motor revolutions MRN2 for reducing the boosting ratio of the booster 10 is set lower than the limit value of the number of motor revolutions MRN2 for performing torque reduction control of the motor generator MG2. the above limit value. Thus, complete protection against inverter overvoltage is obtained.

[0097] Referring again to FIGS. 1 and 2 . A hybrid vehicle 100A including the...

no. 3 example

[0110] Although the torque reduction control of the motor generator MG2 is performed in response to the excessive rotation of the motor generator MG2, in the case where the power consumption of the motor generator MG2 immediately before the performance of the torque reduction control is small, the torque of the motor generator MG2 is reflected The rise of the reduced voltage VM is smaller. In the third embodiment, when excessive rotation occurs to motor generator MG2, the boosting ratio of booster 10 is reduced only if the electric power consumed by motor generator MG2 exceeds a preset threshold.

[0111] A hybrid vehicle 100B including the load driving device of the third embodiment is based on the configuration of the hybrid vehicle 100 of the first embodiment shown in FIG. 1 , and includes an ECU 40B instead of the ECU 40 .

[0112] FIG. 7 is a functional block diagram of an ECU 40B according to a third embodiment of the present invention. Referring to FIG. 7 , an ECU 40B ...

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Abstract

When an ECU (40) determines that the motor rotation speed (MRN2) of a motor generator (MG2) exceeds a predetermined limit value (YES in step S20), it controls torque of the motor generator (MG2) to zero (step S30). Further, when the ECU (40) determines that the motor rotation speed (MRN2) exceeds a predetermined limit value, it lowers a voltage command Vcom of an inverter input voltage VM by a predetermined amount (step S40).

Description

technical field [0001] The invention relates to a load driving device, a vehicle and an abnormality handling method of the load driving device. Specifically, the present invention relates to a load driving device including a booster for boosting a DC voltage from a DC (direct current) power source, a vehicle, and an abnormality handling method of the load driving device. Background technique [0002] Japanese Patent Application Laid-Open No. 2003-111203 discloses a driver for an automobile dynamo-electric machine capable of suppressing the voltage fluctuations of the power supply. The drive for an automobile motor generator includes a high voltage power supply system that bidirectionally transmits electric power to and from a high voltage automobile motor generator via an inverter, having a low voltage battery for generating a voltage lower than that of the high voltage power supply system a low-voltage power supply system, a DC-DC converter arranged between the high-volta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P5/74B60K6/04B60L11/14B60W10/08B60W20/00H02M7/48H02P27/06B60K6/46B60L50/16H02P5/50H02P23/16
CPCB60L3/06Y02T10/6217B60L3/0023B60K6/46B60L3/12B60L3/08B60W10/08B60W20/00Y02T10/62Y02T10/7072B60W20/50
Inventor 佐藤亮次
Owner DENSO CORP
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