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Method for tracking frequency signal, and corresponding sensor unit for vehicle

A sensor unit, frequency signal technology, applied in the monitoring pulse chain mode and other directions, to achieve the effect of eliminating the ASIC area

Inactive Publication Date: 2013-09-18
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to machining tolerances and process fluctuations these oscillators are only able to achieve an accuracy / tolerance of about 5% after oscillator calibration in terms of lifetime and temperature

Method used

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  • Method for tracking frequency signal, and corresponding sensor unit for vehicle
  • Method for tracking frequency signal, and corresponding sensor unit for vehicle
  • Method for tracking frequency signal, and corresponding sensor unit for vehicle

Examples

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Embodiment Construction

[0030] Such as Figure 1 to Figure 4 The illustrated sensor system 1 in a vehicle comprises at least one sensor unit 10 and a control unit 40 , which is embodied, for example, as an airbag control unit. In the illustrated embodiment, the sensor unit 10 comprises at least one sensor element 12 for acquiring a physical quantity, a clock generator 14 for providing a frequency signal T (which is generated, for example, at a frequency of 9 MHz), for generating a tracking Signal S N The setting unit 16, at least one interface unit 30 for data communication with the controller 40 and the monitoring unit 20 for monitoring the frequency signal T provided, the monitoring unit includes a second frequency signal T for counting A counter 22 and receives at least one control signal LS from at least one interface unit 30 .

[0031] According to the invention, the monitoring unit 20 comprises a first register 24 and a comparison unit 260, the first register stores the current counter readin...

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Abstract

The present invention relates to a method for tracking a frequency signal, and a corresponding sensor unit for a vehicle. The method for tracking the frequency signal is provided within a unit, and receives at least one signal through at least one interface unit, wherein the supplied frequency signal is counted by a first counter within the unit. A current count reading of the first counter is stored in a first register within the unit according to the at least one signal, and is compared with a preset value range by a comparator unit within the unit. The value range is defined by at least one preset threshold, and an adjusting signal is generated by the comparator unit. If the current count reading of the first counter output as an output signal of the first register is outside the preset value range, the comparator unit generates the adjusting signal to influence the tracking of the frequency of the frequency signal, and a tracking signal of the frequency signal is generated through the adjusting signal.

Description

technical field [0001] The invention relates to a method for tracking a frequency signal according to the preamble of independent claim 1 and a corresponding sensor unit for a vehicle according to the preamble of independent claim 8 . Background technique [0002] It is known from the prior art that digital and analog sensor units generally require a frequency signal as a clock signal for operation. This frequency signal can be fed in externally or generated internally by an oscillator. In rotational speed sensors, the mechanical sensor itself can also be used as an oscillator to generate an internal frequency signal via a conventional phase-locked loop (PLL). A sensor-internal oscillator can be realized for the inner central sensor unit and the peripheral sensors. Due to manufacturing tolerances and process fluctuations, these oscillators are only able to achieve an accuracy / tolerance of approximately 5% after calibration of the oscillator with respect to service life and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K5/19
Inventor H·特林S·科普林
Owner ROBERT BOSCH GMBH
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