Robert Boschgmbh

Walter Berger

Ewald Stuible

Martin Pfau

Robert Weiland

The invention proceeds from a system for detecting a condition of the wheels of a motor vehicle. For this purpose, means are provided for generating rpm signals, which represent the rotational movements of the wheels, and evaluation means, by means of which a signal is outputted in dependence upon the generated signals, which signal represents the display-relevant condition. The essence of the invention is that the evaluation means are so configured that, first, and dependent upon the generated rpm signals, first difference values are formed for the rpm differences of at least two vehicle wheels on the two sides of the vehicle. Depending upon a first comparison of the formed difference values to each other and/or to pregivable first threshold values, the signal, which represents a display-relevant condition, is outputted. With the invention, one obtains a very simple and cost-effective wheel condition detection (emergency wheel detection, tire air loss detection) which operates correctly also when the vehicle drives through a curve.

System for monitoring tire status

An error signal is generated in a motor vehicle with at least two wheels located on the right and left in the front and rear areas of the motor vehicle. This is accomplished by detecting signals representing the rotational speeds of the vehicle wheels. In addition, cornering is detected, depending on the signals detected in particular. The signals detected in cornering are then compared with an ideal cornering performance, whereupon the error signal is generated, depending on the result of the comparison. With the comparison, it is possible to detect by a simple method erroneous rotational speed sensor signals, e.g., due to transposition of the lines.

Process and device for generating an error signal in a motor vehicle

At certain operating points, a plausibility test of the detected rotational speed signals is used to recognize an existing defect. The operating point for implementing the plausibility test is determined when it is detected that the motor vehicle has accelerated. The operating point at which defects in speed sensors are detected is determined in a simple manner but in such a way that any defect which may be present can be recognized reliably.

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Erligheim, Germany

Walter Berger