Device for testing an electronic control unit, comprising a hardware-in-the-loop simulator
A device for testing an electronic control unit with a hardware-in-the-loop simulator to simulate at least one sensor signal and equipped with a two-wire cable via which the sensor signal is outputted, and with a switchover device which is connected to the hardware-in-the-loop simulator via the two-wire cable, so that the sensor signal is receivable from the switchover device. The two-wire cable in the switchover device is routed to a two-pole interface of the switchover device to which the electronic control unit can be connected in order to receive the sensor signal, and the switchover device has two voltage sources, each of which is assigned to a wire of the two-wire cable and can be connected to the respective wire via a controllable switch. In this way, it is possible to continue to supply the sensor with electrical energy via two switchable voltage sources during diagnostics, thus avoiding diagnostic errors.
1 . A device to test an electronic control unit, the device comprising:
a hardware-in-the-loop simulator that is configured to simulate at least one sensor signal and comprises a two-wire cable via which the sensor signal is outputtable; and
a switchover device connected to the hardware-in-the-loop simulator via the two-wire cable so that the switchover device receives the sensor signal, the two-wire cable in the switchover device being routed to a two-pole interface of the switchover device to which the electronic control unit is connectable in order to receive the sensor signal;
two voltage sources arranged in switchover device, each of the two voltage sources being assigned to a wire of the two-wire cable and being connected to the respective wire via a controllable switch.
2 . The device according to claim 1 , wherein the switchover device comprises a sensing and switching device that is connected in the switchover device to one of the wires of the two-wire cable and is set up to detect the signal on this wire and is connected to the controllable switches such that they are switched with the sensing and switching device depending on the signal detected on the wire.
3 . The device according to claim 1 , wherein the sensor is a wheel speed sensor.
4 . The device according to claim 1 , wherein the sensing and switching device has a comparator.
5 . The device according to claim 1 , wherein the switchover device has one diode in each wire of the two-wire cable, and wherein the respective blocking direction of the diodes once points to the hardware-in-the-loop simulator and once away from the hardware-in-the-loop simulator.
6 . The device according to claim 1 , wherein the controllable switches each comprise a relay, a metal-oxide semiconductor field-effect transistor or a bipolar transistor.
7 . The arrangement according to claim 1 , wherein the switchover device comprises two diodes arranged such that the two diodes are operated in the blocking direction in the diagnostic state.
8 . The arrangement according to claim 1 , wherein the electric control unit is an electronic braking system.
9 . An arrangement comprising:
the device according to claim 1 ; and
an electronic control unit to be tested, the electronic control unit being connectable to the two-pole interface of the switchover device to receive the sensor signal, the electronic control unit comprising an evaluation unit, a diagnostics unit and a switching device, the evaluation unit being configured to evaluate the sensor signal and to supply a sensor that is connectable to the electronic control unit with electrical power,
wherein the diagnostics unit is set up to generate a diagnostic signal for the sensor that is connectable to the electronic control unit, and
wherein the switching device is connected between the two-pole interface and the evaluation unit and the diagnostics unit such that the switching device is either used to connect the evaluation unit to the two-pole interface for a normal state or connect the diagnostics unit to the two-pole interface for a diagnostic state.
10 . The arrangement according to claim 9 , wherein, in the normal state, the two voltage sources of the switchover device are disconnected from the two wires of the two-wire cable and, in the diagnostic state, the two voltage sources of the switchover device are connected to the two wires of the two-wire cable.