System for controlling the operation of modules using information transmitted from a control device via a data bus, a trigger device and a test circuit
First Claim
1. A system for controlling the operation of modules by transmitting information from a control device via a databus, comprising:
- a communications interface which is connected to the control device via a data line and has an input, which communications interface converts data transmitted by the control module into code words which are transmitted via a communications bus and which includes information relating to the data and a signal state of the input, wherein the communications interface connected to the control device has a plurality of inputs to which signals are configured to be applied, and the communications bus is connected to the modules via a module-end communications interface which has a plurality of outputs to which signals are configured to be applied, the signal state of the inputs being transmitted to the outputs via the communications bus such that there is a predetermined relationship between the signal states of the inputs and outputs, such that functions of the modules are disabled and enabled by means of the signal states of the inputs.
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Accused Products
Abstract
In a data communication system, data is transmitted from a control device to a communication interface and from there via a communication bus to additional communication interfaces of trigger devices. The communication interface on the control device side has inputs, to which signals from said control device and a disarming switch can be assigned. The disarming switch can be circumvented by a bypass switch which is controlled by the control device. The state of the signal at the inputs of the communication interface on the control device side is transmitted to coresponding outputs of the communication interfaces of the triggger devices. A trigger device has a safety unit which is used to test at least one trigger unit, when the state of the signal of the outputs authorizes such a test and the trigger voltage source is not yet charged wth the full trigger voltage. In said state, the safety unit also blocks triggering as soon as the trigger voltage has been reached. The inventive system ensures a high degree of functional safety and flexibility.
65 Citations
14 Claims
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1. A system for controlling the operation of modules by transmitting information from a control device via a databus, comprising:
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a communications interface which is connected to the control device via a data line and has an input, which communications interface converts data transmitted by the control module into code words which are transmitted via a communications bus and which includes information relating to the data and a signal state of the input, wherein the communications interface connected to the control device has a plurality of inputs to which signals are configured to be applied, and the communications bus is connected to the modules via a module-end communications interface which has a plurality of outputs to which signals are configured to be applied, the signal state of the inputs being transmitted to the outputs via the communications bus such that there is a predetermined relationship between the signal states of the inputs and outputs, such that functions of the modules are disabled and enabled by means of the signal states of the inputs. - View Dependent Claims (2, 3, 11, 13)
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4. A system for controlling the operation of modules by transmitting information from a control device via a databus, comprising:
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a communications interface which is connected to the control device via a data line and has a sating input connected to a safing switch, which communications interface converts data transmitted by the control module into code words which are transmitted via the communications bus and which include information relating to the data and a signal state of the safing input, wherein the control devices has a test output to which a test signal is configured to be applied from the control device and which is connected to a further input of the communications interface, and a bypass switch is provided parallel to the safing switch such that when the test signal generated by the control device is present a signal state corresponding to the closed safing switch is present at the safing input irrespective of the switch state of the safing switch, and the communications bus is connected to the modules via a module-end communications interface which has a safing output and at least one further output, the signal state of the safing input or of the further input being available at the safing output or further output to disable or enable functions of the modules. - View Dependent Claims (5, 6, 7, 8, 9, 10, 12)
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14. A safety circuit for a firing device of a vehicle occupant protection system, comprising:
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an input to which a signal can be applied and a test input to which a test signal can be applied; and
an AND element having inputs connected to the test output and to a firing voltage source and having an output connected to a safety switch which connects the input to ground if a test signal is applied to the test output and the firing voltage source has a voltage which is not sufficient to fire the firing unit.
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Specification