Device for combined detection of axle acceleration and wheel rotational speed and method for determining pressure
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Abstract
The pressure in a motor vehicle tire can be determined by means of a ‘wheel-independent’ device (1) that is in a largely rigid manner connected mechanically to an element (2) of the vehicle body (3, 14) oscillating with the motor vehicle wheel (4).
In order to determine the—preferably absolute—tire pressure by combining the evaluation of rotational speed data and axle frequency analysis, said device (1) includes a signal pre-processing element (6) provided with electronic components for processing the sensor signals, said element being connected to a magnetic sensor element (7) and an acceleration sensor element (8) or to a combined magnetic/acceleration sensor element (5) by means of an electrically conductive element connection (9), wherein the magnetic sensor element (7) or the magnetic/acceleration sensor element (5) is operatively connected to a magnetic encoder (16) arranged on the wheel side.
To improve determination of characteristic quantities, preferably the vibration behavior of at least two wheels (4) is analyzed.
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Citations
40 Claims
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1-20. -20. Canceled
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21. A device (1) for the combined detection of the axle acceleration and the wheel speed, wherein the device (1) is mechanically connectable to an element (2) of the motor vehicle chassis (3, 14) that resonates with one motor vehicle wheel (4) respectively,
wherein the device comprises a signal pre-processing element (6) with electronic components for the pre-processing of sensor signals, which is connected to a magnetic sensor element (7) and an acceleration sensor element (8) or a combined magnetic/acceleration sensor element (5) by means of electrically conductive element connections (9), and wherein the magnetic sensor element (7) or the magnetic/acceleration sensor element (5) is in operative engagement with a wheel-sided magnetic encoder (16).
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26. A method of determining the pressure in a motor vehicle tire by means of a wheel-speed based method which assesses the tire pressure loss (DDS) by evaluating wheel speed data from several wheel speed sensors and producing quantities of the ratio between wheel speed data of different wheel pairs while taking into account data about the current driving condition,
wherein the method uses data about the vibration behavior of at least one of the wheels (4), being acquired by means of an acceleration sensor (8), with the aid of specific tire parameters for improving the determination of parameters.
Specification