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Apparatus for controlling electric power steering apparatus

一种电动助力转向、控制装置的技术，应用在自动转向控制部件、电动转向机构、动力转向机构等方向，能够解决无法正确检测电流Im极性sign、很难正确测定电流Im极性等问题，达到高性能的效果

Active Publication Date: 2013-03-20
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0030] The problem that occurs in the dead time compensation is that the polarity sign(Im) of the current Im cannot be detected correctly
When determining the polarity of the current Im, the noise of the PWM control or the above-mentioned current zeroing phenomenon makes it difficult to correctly determine the polarity of the current Im

Method used

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  • Apparatus for controlling electric power steering apparatus
  • Apparatus for controlling electric power steering apparatus
  • Apparatus for controlling electric power steering apparatus

Examples

Experimental program
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Effect test

Embodiment Construction

[0067] like Figure 5 As shown in (A), the dead time provided to prevent the passing current of the inverter composed of switching elements (FET, IGBT, triac, etc.) A characteristic distortion (dead zone DB) of the output current occurs. However, the dead zone (DB), in Figure 5 In (A), for example, at a low temperature (such as 0°C), when the temperature changes to a high temperature (such as 40°C), such as Figure 5 As shown in (B), it becomes narrow (dead zone DB'( Image 6 shown. That is, let the temperature of the converter (FET) be t, the temperature coefficient be C, and the dead zone width at 0°C be DB 0 , then the actual dead zone width DB is expressed by the following formula 6.

[0068] (Formula 6)

[0069] DB=-C·t+DB 0

[0070] Here, the dead time compensation is to apply a compensation voltage against the timing of crossing 0 ampere, eliminating such as Figure 5 The characteristic distortion (DB, DB') of the output current shown in (A) and (B). That is, u...

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Abstract

To provide an apparatus for controlling an electric power steering apparatus such that, by correcting a dead time compensation amount on the basis of the temperature of a switching element, inconsistency between a dead time and a dead time compensation value can be limited, distortion in motor current or development of torque ripple can be suppressed, dead time compensation can be performed in accordance with a steering condition so as to suppress the generation of noise, and high steering performance can be obtained from low-temperature to high-temperature environment. [Solution] The control apparatus is provided with: a dead time characteristics unit for calculating a dead time characteristic value; a steering state determination unit for determining a steering state; a gain unit for varying the gain of the dead time characteristic value in accordance with the determination of the steering state; a sign determination unit for determining a sign on the basis of a detected current or a current command value of a motor or a model current value by using a sign determination method which is switched in accordance with the determination of the steering state; a temperature sensor for detecting an inverter temperature; a dead time temperature correction value calculation unit for calculating a dead time temperature correction value corresponding to the temperature; and an arithmetic processing unit for arithmetically processing the dead time compensation value to which the sign is allotted with the dead time temperature correction value with respect to an output from the gain unit so as to output a dead time compensation value.

Description

technical field [0001] The present invention relates to a control device for an electric power steering device that supplies steering assist force generated by an electric motor to a steering system of a vehicle, and in particular to a method for improving dead time compensation of a motor-driven converter according to the steering state and converter temperature Control unit for electric power steering. Background technique [0002] The electric power steering device uses the rotational force of the electric motor to apply auxiliary force to the power steering device of the vehicle, and applies the driving force of the electric motor to the steering shaft or the rack shaft through a transmission mechanism such as a gear or a belt through a reducer. In addition, an inverter is used in a motor drive circuit in order to supply a current to a motor to generate a desired torque in the motor. [0003] Here, if figure 1 As shown, the general structure of the existing electric po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D6/00B62D5/04B62D101/00B62D119/00
CPCB62D5/0463B62D5/0496B62D6/00B62D5/046
Inventor 北爪徹也
Owner NSK LTD
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