Circuit arrangement for monitoring pressure and temperature of tires
First Claim
1. A circuit arrangement for monitoring air volume in a vehicle wheel tire, and circuit arrangement comprising sensor means rotatably fastened to the vehicle wheel for sensing air pressure and temperature in the tire and for generating respective signals;
- an evaluating circuit for generating a warning signal when the air volume in the tire falls below a predetermined value, and fixed with respect to the vehicle;
electromagnetic transmitter means for transmitting the respective signals from said sensor means to said evaluating circuit, said evaluating circuit including a correction circuit connected with said electromagnetic transmitter means for receiving the respective signals and predetermined correction parameters and for outputting measurement values of the tire temperature and the tire air pressure in accordance with the correction parameters.
1 Assignment
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Accused Products
Abstract
A circuit arrangement is suggested for monitoring the air volume in vehicle tires which effects the most accurate possible correction of the temperature measured by a sensor fastened at the wheel to the actual air temperature in the tire. For this purpose, the temperature and pressure measurement value of the tire measured by the rotating sensor (13) of the wheel to be monitored is fed to a correction circuit (18) which is also receives a plurality of correction parameters (p, F, K, v). A corrected value for the temperature (tk) or for the air pressure in the tire is transmitted at the output of the correction circuit (18) as a function of the correction parameters (FIG. 1).
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Citations
7 Claims
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1. A circuit arrangement for monitoring air volume in a vehicle wheel tire, and circuit arrangement comprising sensor means rotatably fastened to the vehicle wheel for sensing air pressure and temperature in the tire and for generating respective signals;
- an evaluating circuit for generating a warning signal when the air volume in the tire falls below a predetermined value, and fixed with respect to the vehicle;
electromagnetic transmitter means for transmitting the respective signals from said sensor means to said evaluating circuit, said evaluating circuit including a correction circuit connected with said electromagnetic transmitter means for receiving the respective signals and predetermined correction parameters and for outputting measurement values of the tire temperature and the tire air pressure in accordance with the correction parameters. - View Dependent Claims (2, 3, 4, 5, 6)
- an evaluating circuit for generating a warning signal when the air volume in the tire falls below a predetermined value, and fixed with respect to the vehicle;
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7. A circuit arrangement as set forth in claim 7, wherein said correction parameters include a temperature differential value between the temperature measurement value during test drives and the tire temperature measurement value during regular driving of the vehicle.
Specification