Data transmission process within a data processing system suitable for use in motor vehicles
First Claim
1. A data transmission process within a data processing system suitable for use in motor vehicles and comprising one control unit and at least one peripheral unit connected to the control unit via a data line, said process comprising the steps of:
- setting a period duration of a pulse width modulated (PWM) signal suitable for use with the control unit as a nominal value;
generating an actual pulse width modulated signal (PWM signal) by the at least one peripheral unit as the smallest unit of information;
transmitting the PWM signal to the control unit;
determining the period duration as an actual value of the transmitted PWM signal;
comparing the actual value with the nominal value; and
,if the actual and nominal values do not match, disregarding that particular transmitted unit of information represented by the PWM signal in the control unit.
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Accused Products
Abstract
A trigger circuit for occupant protection systems in motor vehicles comprises a control unit which will effect the triggering of a means of restraint such as an airbag, depending on sensor signals generated by one or more external sensor units. To achieve a degree of triggering certainty, data interrogation must take place in very short time intervals. A safe transmission of data between the control unit and the sensor units will be ensured if, in accordance with this invention, the information units to be transmitted will each be encoded by means of a PWM signal with a certain period duration. The control unit will check the period duration of the PWM signal received, and, in the event of this actual period duration not matching the specified nominal value, it will not accept the relevant unit of information.
33 Citations
8 Claims
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1. A data transmission process within a data processing system suitable for use in motor vehicles and comprising one control unit and at least one peripheral unit connected to the control unit via a data line, said process comprising the steps of:
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setting a period duration of a pulse width modulated (PWM) signal suitable for use with the control unit as a nominal value; generating an actual pulse width modulated signal (PWM signal) by the at least one peripheral unit as the smallest unit of information; transmitting the PWM signal to the control unit; determining the period duration as an actual value of the transmitted PWM signal; comparing the actual value with the nominal value; and
,if the actual and nominal values do not match, disregarding that particular transmitted unit of information represented by the PWM signal in the control unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification