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Electric vehicle and its control method

A technology of electric vehicles and control methods, applied in the direction of electric vehicles, hybrid vehicles, motor vehicles, etc., capable of solving problems such as unfavorable, bad driving feeling, and increased steering force of ineffective power steering

Inactive Publication Date: 2009-07-29
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such stop control may disadvantageously result in ineffective power steering and incur a sudden increase in required steering force when the electric vehicle continues to run after a predetermined period of time has elapsed.
In a case where the battery voltage is lowered, for example, due to the acceleration of the electric vehicle, stopping the power supply to the drive motor conflicts with the output of the required drive force thus causing bad driving feeling

Method used

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  • Electric vehicle and its control method
  • Electric vehicle and its control method

Examples

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Embodiment Construction

[0023] A mode for carrying out the present invention will be described below as a preferred embodiment. figure 1 The structure of a hybrid vehicle 20 serving as an electric vehicle in one embodiment of the present invention is schematically shown. As shown in the figure, the hybrid vehicle 20 of the present embodiment includes an engine 22, a three-shaft type power distribution integration (integration) mechanism 30 connected to a crankshaft 26 serving as an output shaft of the engine 22 through a vibration damper 28, and The motor MG1 to which the power distribution integrated mechanism 30 is connected and capable of generating electricity, the speed reducer 35 mounted on the ring gear shaft 32a serving as the drive shaft connected to the power distribution comprehensive mechanism 30, and the other motor MG2 connected to the speed reducer 35 , and a hybrid electronic control unit 70 that controls the entire power take-off.

[0024] The engine 22 is an internal combustion eng...

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Abstract

In response to a decrease in observed battery voltage Vb to or below a preset threshold value Vs1, the control procedure of the invention closes the gates of an inverter for an air conditioner to stop a supply of electric power to the air conditioner (at a time point t1). In response to a further decrease in observed battery voltage Vb to or below a preset threshold value Vm1, the control procedure closes the gates of inverters for motors MG1 and MG2 to stop supplies of electric power to the motors MG1 and MG2 (at a time point t2). The threshold values Vs1 and Vm1 are set to keep the battery voltage Vb at or above a minimum required voltage for proper operations of an electric power steering (EPS). This arrangement guarantees the minimum required voltage for proper operations of the EPS and accordingly ensures the stable steering performance even in the event of a voltage decrease of the battery.

Description

technical field [0001] The present invention relates to an electric vehicle and a control method for the electric vehicle. More particularly, the present invention relates to an electric vehicle driven by output power of an electric motor, and a control method of the electric vehicle. Background technique [0002] A proposed electric vehicle runs with the output power of a drive motor (motor) driven by electric power supplied from a storage battery, and has a power steering device actuated by the output power of a power steering motor (see, for example, Japanese Utility New Unexamined Publication Patent Publication No.64-1171). This proposed electric vehicle stops the power supply to the drive motor when the abnormal voltage of the battery drops, while stopping the power supply to the power steering motor after a predetermined period of time corresponding to the coasting time has elapsed. This prevents over-discharging of the battery and ineffective power steering during f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L11/18B60K6/28B60K6/20B60W10/08B60W10/26B60W10/20B60W10/30B60W10/06B60W20/00
CPCY02T10/7005Y02T10/7077Y02T10/70
Inventor 干场健天野正弥
Owner TOYOTA JIDOSHA KK
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