System for determining pneumatic tire pressure for motor vehicle
First Claim
1. A system for determining a pneumatic tire pressure of road wheels on a motor vehicle, comprising:
- first differential speed means for detecting a front rotational speed difference between rotational speeds of front left and right road wheels of the motor vehicle;
second differential speed means for detecting a rear rotational speed difference between rotational speeds of rear left and right road wheels of the motor vehicle;
running condition detecting means for detecting a running condition of the motor vehicle;
reference differential speed calculating means for calculating a reference rotational speed difference between rotational speeds of the front left and right road wheels based on an output signal from said running condition detecting means;
first pressure reduction determining means for comparing said front rotational speed difference and said rear rotational speed difference to determine a pneumatic tire pressure reduction of said front left and right road wheels or said rear left and right road wheels;
second pressure reduction determining means for comparing said front rotational speed difference or said rear rotational speed difference and said reference rotational speed difference to determine a pneumatic tire pressure reduction of one of said front left and right road wheels or said rear left and right road wheels; and
final pressure reduction determining means for determining a pneumatic tire pressure reduction from output signals from said first pressure reduction determining means and said second pressure reduction determining means based on at least a combination of a first ratio in said first pressure reduction determining means and a second ratio in said second pressure reduction determining means corresponding to one of;
(a) at least a steering angle, (b) at least a yaw rate, and (c) at least a lateral acceleration of said motor vehicle.
2 Assignments
0 Petitions
Accused Products
Abstract
The rotational speed difference between rotational speeds of front and rear road wheels of a motor vehicle is weighted by a first ratio, and the difference between the rotational speed difference between rotational speeds of front left and right road wheels and an average signal of reference steering angle or between the rotational speed difference between rotational speeds of rear left and right road wheels and the average signal of reference steering angle is weighted by a second ratio. A sum signal representative of the sum of the rotational speed difference weighted by the first ratio and the difference weighted by the second ratio is used to determine a pneumatic tire pressure reduction highly accurately even when running conditions of the motor vehicle change such as when the motor vehicle makes a turn.
48 Citations
3 Claims
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1. A system for determining a pneumatic tire pressure of road wheels on a motor vehicle, comprising:
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first differential speed means for detecting a front rotational speed difference between rotational speeds of front left and right road wheels of the motor vehicle; second differential speed means for detecting a rear rotational speed difference between rotational speeds of rear left and right road wheels of the motor vehicle; running condition detecting means for detecting a running condition of the motor vehicle; reference differential speed calculating means for calculating a reference rotational speed difference between rotational speeds of the front left and right road wheels based on an output signal from said running condition detecting means; first pressure reduction determining means for comparing said front rotational speed difference and said rear rotational speed difference to determine a pneumatic tire pressure reduction of said front left and right road wheels or said rear left and right road wheels; second pressure reduction determining means for comparing said front rotational speed difference or said rear rotational speed difference and said reference rotational speed difference to determine a pneumatic tire pressure reduction of one of said front left and right road wheels or said rear left and right road wheels; and final pressure reduction determining means for determining a pneumatic tire pressure reduction from output signals from said first pressure reduction determining means and said second pressure reduction determining means based on at least a combination of a first ratio in said first pressure reduction determining means and a second ratio in said second pressure reduction determining means corresponding to one of;
(a) at least a steering angle, (b) at least a yaw rate, and (c) at least a lateral acceleration of said motor vehicle. - View Dependent Claims (2, 3)
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Specification