Control system and control method for controlling power steering apparatus
First Claim
1. A control system for a power steering apparatus which controls a steering assist amount of a steering mechanism of a vehicle to coincide with a target steering assist amount, comprising:
- vehicle speed detection means for detecting a vehicle speed;
lateral acceleration detection means for determining a lateral acceleration acting upon-the vehicle; and
a controller for receiving the detected vehicle speed as a first input factor and setting a first target amount which is decreased according to an increase in the detected vehicle speed, for receiving a product of the detected vehicle speed and the determined lateral acceleration as a second input factor and setting a second target amount which is decreased according to an increase in the product, and for setting the target steering assist amount according to the first target amount and the second target amount.
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Accused Products
Abstract
In a control system for a power steering apparatus, in which a steering assist amount in a steering mechanism of a vehicle is controlled to a target assist amount, a vehicle speed sensor 41 for detecting a running speed V of the vehicle and a steering angle sensor 52 for detecting a steering angle ha of the vehicle are provided. A lateral acceleration calculation unit calculates a lateral acceleration GY from the vehicle speed V and the steering angle ha and further determines the product V.GY of the vehicle speed V and the lateral acceleration GY. A fuzzy logic calculation unit then sets the target assist amount in accordance with a fuzzy logic rule using the vehicle speed V and the product V.GY as input conditions (membership functions). This thereby provides a control system and control method for controlling a power steering apparatus which presents an optimum steering characteristic in response to the running condition of the vehicle.
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Citations
12 Claims
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1. A control system for a power steering apparatus which controls a steering assist amount of a steering mechanism of a vehicle to coincide with a target steering assist amount, comprising:
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vehicle speed detection means for detecting a vehicle speed; lateral acceleration detection means for determining a lateral acceleration acting upon-the vehicle; and a controller for receiving the detected vehicle speed as a first input factor and setting a first target amount which is decreased according to an increase in the detected vehicle speed, for receiving a product of the detected vehicle speed and the determined lateral acceleration as a second input factor and setting a second target amount which is decreased according to an increase in the product, and for setting the target steering assist amount according to the first target amount and the second target amount. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A control method for controlling a power steering apparatus for controlling a steering assist amount in a steering mechanism of a vehicle to coincide with a target steering assist amount, comprising the steps of:
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(a) detecting a vehicle speed; (b) determining a lateral acceleration acting upon the vehicle; (c) setting a first target amount, which is decreased according to an increase in the detected vehicle speed, the detected vehicle speed being received as a first input factor; (d) setting a second target amount, which is decreased according to an increase in a product of the detected vehicle speed and the determined lateral acceleration, the product being received as a second input factor; and (e) setting a target steering assist amount according to the first target amount and the second target amount. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification