Transceiver for a bus system and method for reducing line-associated emissions
AssigneeRobert Bosch GmbH
InventorsSteffen Walker, Cyrille Brando
Life of this patent
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Abstract
A transceiver for a CAN bus system and a method for reducing line-associated emissions. The transceiver includes a transmitter for transmitting a transmitted signal to a first bus wire of a bus of the bus system, and for transmitting the transmitted signal to a second bus wire of the bus, the bus system being ensured exclusive, collision-free access of a subscriber station to the bus of the bus system at least temporarily; a receiver for receiving the bus signal transmitted on the bus wires; and an emissions reduction unit which is configured to control the signals for the bus wires on the basis of a measured level of a differential bus voltage of the signals on the bus wires, when a dominant state of the transmitted signal occurs.
Claims11
A transceiver of a station of a bus system, comprising:
- a transmitter connected to a first bus wire of a bus of the bus system and to a second bus wire of the bus, wherein, in the bus system, exclusive, collision-free access of a subscriber station to the bus of the bus system is ensured at least temporarily;
- and
- a receiver that includes a comparator and a controller and that is connected to the first and second bus wires so that a received signal from another station can be obtained from the first and second bus wires;
- wherein, when a dominant state of a transmitted signal that is transmitted by the station to another station via the first and second bus wires occurs, the controller is configured to reduce a difference, measured by the comparator, between (a) a voltage level of the transmitted signal as placed by the transmitter onto the first bus wire and (b) a voltage level of the transmitted signal as placed by the transmitter onto the second bus wire, as long as the measured difference is determined to be above a predefined value.
A bus system, comprising:
- a bus;
- at least two subscriber stations interconnected by the bus in such a manner that they may communicate with each other;
- wherein:
- each respective one of at least one of the at least two subscriber stations includes a transceiver, the transceiver including:
- a transmitter connected to a first bus wire of the bus and to a second bus wire of the bus;
- and
- a receiver that includes a comparator and a controller and that is connected to the first and second bus wires so that a received signal from another of the at least two subscriber stations can be obtained from the first and second bus wires;
- when a dominant state of a transmitted signal that is transmitted by the respective subscriber station to the other of the at least two subscriber stations via the first and second bus wires occurs, the controller is configured to reduce a difference, measured by the comparator, between (a) a voltage level of the transmitted signal as placed by the transmitter onto the first bus wire and (b) a voltage level of the transmitted signal as placed by the transmitter onto the second bus wire, as long as the measured difference is determined to be above a predefined value;
- and
- in the bus system, exclusive, collision-free access of a subscriber station to the bus of the bus system is ensured at least temporarily.
A method for reducing line-associated emissions, the method being executed by a transceiver for a bus system, where exclusive, collision-free access of a subscriber station to a bus of the bus system is ensured at least temporarily, the transceiver including a transmitter and a receiver that includes a comparator and a controller, the method comprising the following steps:
- transmitting a transmitted signal to a first bus wire of the bus, using the transmitter;
- transmitting the transmitted signal to a second bus wire of the bus;
- receiving a bus signal transmitted on the first and second bus wires, using the receiver;
- and
- when a dominant state of the transmitted signal occurs, the controller reducing a difference, measured by the comparator, between (a) a voltage level of the transmitted signal as placed by the transmitter onto the first bus wire and (b) a voltage level of the transmitted signal as placed by the transmitter onto the second bus wire, the reduction being performed as long as the measured difference is determined to be above a predefined value.
Dependencies are inferred from the claim text.