Output unit, receiver unit, data transmission for a motor vehicle and corresponding method
First Claim
1. An output unit for outputting a signal to a transmission channel having a first bus line and a second bus line of a motor vehicle, the output unit comprising:
- a fault-tolerant coding unit for receiving and converting a sensor signal into outgoing transmission signals TxA and TxB;
at least two high-speed driver modules connected antiparallel to one another and downstream from said coding unit for connecting the output unit to the transmission channel and for converting the outgoing transmission signals TxA and TxB into the signal to be emitted; and
a comparison unit performing a voltage comparison of the outgoing transmission signals TxA and TxB with incoming receive signals RxA and RxB, said comparison unit connected to said coding unit;
said coding unit operating under and programmed with a first coding rule for a normal operating mode if equivalence between voltages of TxA and RxA and/or of TxB and RxB is detected by said comparison unit;
said coding unit operating under and programmed with a second coding rule for a special operating mode in an event of inequivalence being detected by said comparison unit between the voltages of TxA and RxA and/or of TxB and RxB, and therefore in an event of one of the bus lines being externally short-circuited to ground or to a vehicle battery;
the first and second coding rules for the outgoing transmission signals TxA and TxB provide a first character set of at least n+1 characters if a second character set for the sensor signal has n characters.
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Accused Products
Abstract
The invention relates to the use of a first coding or decoding rule for a normal operation and of a second coding or decoding rule for a particular operation. Said invention provides the opportunity for speedily transmitting data between different satellite devices arranged in a motor vehicle and an evaluation unit arranged, for example in the central part thereof, even when the data bus (31, 32) of a transmission channel CAN (3) is externally short circuited, for example by a traffic accident, i.e. the data bus BUS L (32) and the data bus BUS H (31) are connected to earth (GND) or to a battery (Vbat). The invention can be used, in particular for protecting passengers.
16 Citations
29 Claims
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1. An output unit for outputting a signal to a transmission channel having a first bus line and a second bus line of a motor vehicle, the output unit comprising:
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a fault-tolerant coding unit for receiving and converting a sensor signal into outgoing transmission signals TxA and TxB; at least two high-speed driver modules connected antiparallel to one another and downstream from said coding unit for connecting the output unit to the transmission channel and for converting the outgoing transmission signals TxA and TxB into the signal to be emitted; and a comparison unit performing a voltage comparison of the outgoing transmission signals TxA and TxB with incoming receive signals RxA and RxB, said comparison unit connected to said coding unit; said coding unit operating under and programmed with a first coding rule for a normal operating mode if equivalence between voltages of TxA and RxA and/or of TxB and RxB is detected by said comparison unit; said coding unit operating under and programmed with a second coding rule for a special operating mode in an event of inequivalence being detected by said comparison unit between the voltages of TxA and RxA and/or of TxB and RxB, and therefore in an event of one of the bus lines being externally short-circuited to ground or to a vehicle battery; the first and second coding rules for the outgoing transmission signals TxA and TxB provide a first character set of at least n+1 characters if a second character set for the sensor signal has n characters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 28)
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16. A receiving unit for receiving a signal to be received from a transmission channel having a first bus line and a second bus line of a motor vehicle, the receiving unit comprising:
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a decoding unit for converting incoming receive signals into an operating signal; at least two high-speed driver modules connected antiparallel to one another and upstream from said decoding unit, said driver modules connecting said receiver unit to the transmission channel and converting the signal to be received into the incoming receive signals; a detection unit permitting detection of timing pulse edges of the incoming receive signals, said detection unit connected to said decoding unit; said decoding unit operating under and programmed with a first decoding rule for a normal operating mode when synchronism of the timing pulse edges is detected by said detection unit for a signal time unit; said decoding unit operating under and programmed with a second decoding rule for a special operating mode when asynchronism of the timing pulse edges is detected by said detection unit for the signal time unit; and the first and second decoding rules for the operating signal provide a first character set of n characters if a second character set for the incoming receive signals have at least n+1 characters. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 29)
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27. A system for transmitting data in a motor vehicle via a transmission channel having at least two bus lines, the system comprising:
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an output unit containing; a fault-tolerant coding unit for receiving and converting a sensor signal into outgoing transmission signals TxA and TxB; at least two high-speed driver modules connected antiparallel to one another and downstream from said coding unit for connecting the output unit to the transmission channel and for converting the outgoing transmission signals TxA and TxB into the signal to be emitted; a comparison unit performing a voltage comparison of the outgoing transmission signals TxA and TxB with incoming receive signals RxA and RxB, said comparison unit connected to said coding unit; said coding unit operating under and programmed with a first coding rule for a normal operating mode if equivalence between voltages of TxA and RxA and/or of TxB and RxB is detected by said comparison unit; said coding unit operating under and programmed with a second coding rule for a special operating mode in an event of inequivalence being detected by said comparison unit between the voltages of TxA and RxA and/or of TxB and RxB, and therefore in an event of one of the bus lines being externally short-circuited to ground or to a vehicle battery; the first and second coding rules for the outgoing transmission signals TxA and TxB provide a first character set of at least n+1 characters if a second character set for the sensor signal has n characters; and a receiver unit containing; a decoding unit for converting the incoming receive signals RxA and RxB into an operating signal; said driver modules connecting said receiver unit to the transmission channel and converting the signal to be received into the incoming receive signals RxA and RxB; a detection unit permitting detection of timing pulse edges from the incoming receive signals RxA and RxB, said detection unit connected to said decoding unit; said decoding unit operating under and programmed with the first decoding rule for the normal operating mode when synchronism of the timing pulse edges is detected by said detection unit for a signal time unit; said decoding unit operating under and programmed with the second decoding rule for the special operating mode when asynchronism of the timing pulse edges is detected by said detection unit for the signal time unit; the first and second decoding rules for the operating signal provide the second character set of n characters if the first character set for the incoming receive signals RxA and RxB have at least n+1 characters.
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Specification