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Control device

A control device and data transmission technology, applied in the field of high signal resolution and inertial sensors, to achieve the effect of high signal resolution

Inactive Publication Date: 2009-12-09
BOSCH AUTOMOTIVE PROD SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A further disadvantage is that error messages during analog signal transmission can only be detected to a very limited extent

Method used

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Embodiment Construction

[0019] According to the invention, it is proposed to transmit data digitally between the inertial sensor and the processor in the control device. Therefore, it is preferable to use a serial synchronous interface, so that the digital signal will have better transmission guarantee. The transmitted information is extremely stable relative to the voltage fluctuation caused by interference, because the voltage range of the logic value 1 or 0 is relatively large, generally greater than or equal to 80% of the full level value or less than or equal to 20% of the level value. Despite the greater stability, if a transmission error occurs, this is easier to detect. Digital items that are ambiguous with respect to current processor requirements can be easily identified by the system. In addition, the transmission of the status bits and error bits, as well as the transmission of the entire data item including a detailed description of the sensor state, can be carried out without significa...

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Abstract

The invention relates to a control device in which at least one inertial sensor and a processor are accommodated in a housing. The data transmission between the inertial sensors and the control unit takes place digitally. Transmissions include error bits or status bits. Data transmission is especially bidirectional. There are four wires between the controller and the sensor, one of which is used to select the sensor.

Description

technical background [0001] The invention relates to a control device having a processor and at least one inertial sensor in a housing. Background technique [0002] Inertial sensors are currently used in control units as seat belt retraction systems, which transmit their measurement signals in analog form to the analog input of the microcontroller of the control unit. The microcontroller has an analog-to-digital converter. Therefore, since the acceleration sensor and the rotational speed sensor are used as inertial sensors, the acceleration signal or rotational speed signal will be described by an analog voltage-time curve. The actual measured value is the instantaneous value of the deviation from the static value, which is typically half of the inertial sensor supply voltage. It is matched by the sensitivity of the sensor itself, and the sensitivity is expressed in millivolts per unit acceleration or the millivolts corresponding to the angle change per unit time. Additi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60R21/0132G06F7/00G01P15/08B60R21/01G05B19/042G05B19/05G08C19/00
CPCB60R2021/01122B60R21/0132G05B19/0423G05B2219/2637B60R2021/01184G05B2219/25025G05B2219/25317G05B2219/25338G05B2219/25241G05B2219/37388G05B2219/25258
Inventor E·施泰格尔C·奥尔H·舒马赫尔
Owner BOSCH AUTOMOTIVE PROD SUZHOU