US 7,610,133 B2Granted

Controller for electric power steering apparatus

AssigneesJtekt Corporation, Fujitsu Ten Limited

InventorsShigeki Nagase, Norimitsu Yukumatsu

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Abstract

In a controller for an electric power steering apparatus, a target value calculation element, which calculates target values of the drive currents of a motor on the basis of a detected value of the steering torque, is constituted by a first integrated circuit provided in a chip. A drive signal value calculation element, which calculates drive signal values for driving the motor on the basis of the target values calculated by the target value calculation element, detected values of the drive currents of the motor, and a detected value of the rotary position of a rotor of the motor, is constituted by a second integrated circuit provided in another chip from the chip. A driving element drives the motor in accordance with the drive signal values. The first integrated circuit is connected communicably to the second integrated circuit. The calculation cycle of the drive signal values is set to be shorter than the calculation cycle of the target values.

Claims18

Dependent claims

A controller for an electric power steering apparatus, comprising:

a target value calculation element for calculating target values of drive currents of a brushless motor for generating steering assist power on a basis of at least a detected value of steering torque;
a drive signal value calculation element for calculating drive signal values for driving said motor on a basis of the target values calculated by said target value calculation element, detected values of the drive currents of said motor, and a detected value of a rotary position of a rotor of said motor;
and
a driving element for driving said motor in accordance with said drive signal values,
wherein:
said target value calculation element is constituted by a first integrated circuit provided in a chip,
said drive signal value calculation element is constituted by a second integrated circuit provided in another chip,
said first integrated circuit is connected communicably to said second integrated circuit, and
a drive signal calculation cycle of said drive signal values repeatedly executed by said second integrated circuit is set to be shorter than a target value calculation cycle of said target values repeatedly executed by said first integrated circuit.

6 more elements

A controller for an electric power steering apparatus, comprising:

a first control part having a target value calculation element which calculates target values of drive currents of a motor for generating steering assist power on a basis of at least a detected value of steering torque;
a second control part having a drive signal value calculation element which calculates drive signal values for driving said motor on a basis of said target values calculated by said target value calculation element, detected values of the drive currents of said motor, and a detected value of a rotary position of a rotor of said motor;
and
a driving part for driving said motor in accordance with said drive signal values,
wherein:
said second control part is provided in a different chip than a chip in which said first control part is provided,
said first control part and said second control part are connected communicably, and
a drive signal calculation cycle of said drive signal values is repeatedly execute by said second control part and is set to be shorter than a target value calculation cycle of said target values repeatedly executed by said first control part.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/440,923Filed 25 May 2006
Priority: JP 2005-15720830 May 2005
Published: US 2006/0266575 A130 Nov 2006
Granted: 27 Oct 2009
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

B62D 5/0463
Controlling the motor: calculating assisting torque from the motor based on driver input
B62D 5/046
Characterised by control features of the drive means as such: controlling the motor
B62D 5/0493
Monitoring the steering system, e.g. failures: detecting processor errors, e.g. plausibility of steering direction
B62D
Motor vehicles

Family

US 2006/0266575 A1Pre-grant publication · published 30 Nov 2006
US 7,610,133 B2This patent

From the US filing history. Foreign family members aren’t listed.

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