Device and method for determining the sensor position of sensor units of a driver assistance system
A device and a method determine sensor positions of sensor units of a driver assistance system, especially a parking aid system of a vehicle. The sensor units each have a plurality of terminals of different identification positions. A data bus is connected for an exchange of data with a central control and evaluation unit in this case with one or more terminals of the sensor unit according to a specific connection scheme, which is different for each of the sensor units, in order to provide an identity code for the sensor position of a sensor unit in this way.
1. A device for determining a sensor position of a sensor unit of a driver assistance system of a motor vehicle, the device comprising:
a plurality of sensor units disposed for monitoring purposes on the motor vehicle and each having a data input and a data output, with said data input being activated and said data output deactivated in an initial state;
a data bus connecting said sensor units to each other in series so that said data output of one of said sensor units is connected to said data input of a following one of said sensor units; and
a central control and evaluation unit connected for an exchange of data over said data bus to individual ones of said sensor units, said central control and evaluation unit allocating a respective sensor unit a new individual identity code and said respective sensor unit activating said data output for a data connection to a next one of said sensor units being a next sensor unit.
2. The device according to claim 1 , wherein each of said sensor units has a controllable switch for activating or deactivating said data output.
3. The device according to claim 2 , wherein each of said sensor units has a sensor control unit for controlling said controllable switch.
4. The device according to claim 2 , wherein each of said sensor units has a non-volatile memory for storing the individual identity code.
5. The device according to claim 4 , wherein said non-volatile memory stores a switching state of said controllable switch of said respective sensor unit.
6. The device according to claim 1 , wherein said central control and evaluation unit transmits a reset signal over said data bus to said sensor units, through which said sensor units performs at least one of deactivating a respective said data output and discards the individual identity code.
7. The device according to claim 1 , wherein said data bus is selected from the group consisting of LIN buses, CAN buses and Flexray buses.
8. The device according to claim 1 , wherein said sensors units are selected from the group consisting of ultrasound sensors, radar sensors, LIDAR sensors and image detection sensors.
9. A method for determining a sensor position of sensor units of a driver assistance system of a vehicle, which comprises the steps of:
connecting the sensor units in series with each other and with a central control and evaluation unit for an exchange of data, with a passage of the data through a sensor unit being blocked in an initial state;
identifying a respective sensor unit by allocation of a new individual identity code to the respective sensor unit by the central control and evaluation unit; and
canceling a blocking of the passage of the data of an identified sensor unit to create a data connection to a next sensor unit.
10. The method according to claim 9 , which further comprises allocating to a last sensor unit in the series, a new individual identity code, without canceling the blocking of the passage of data.
11. The method according to claim 9 , which further comprises storing the new individual identity code in a memory device.
12. The method according to claim 9 , which further comprises sending, via the central control and evaluation unit, a reset signal to the sensor units through which the sensor units are made to perform one of deactivate a respective data output and to discard the individual identity code.