For the first time in a MINI, an electro-hydraulic steering system is being used.
Design
The hydraulic lines and 2 plug connectors for electrical cables are connected to the EHPS unit. The first plug connector contains the voltage supply of the electric motor. The second connector contains the cable for terminal 15, 61 and the D bus for the EHPS control unit.
The speed of the electric motor is controlled in the EHPS control unit, depending on the requirements.
The EHPS runs in two operating modes. If no power-assisted steering is required, the system is in standby mode. When the steering wheel is moved, the system is immediately on maximum operation mode.
The electrical assistance for steering is only in standby mode with the speed signal from the engine. In this case, the speed signal is supplied by the alternator on terminal 61.
If excess temperature is detected during operation, the current intake of the motor is reduced. The reduction takes place in steps as of 110 degrees Celsius.
When the EHPS control unit detects the end of the steering manoeuvre or, for example, detects that a wheel has hit the kerb, the current is briefly reduced to 30 A.
The current of the electric motor with an in idling pump is around 8 A.
The operational readiness of the EHPS steering is ensured between 9 and 16 V. Outside this range, there is no power-assisted steering.
The EHPS unit contains its own control unit with diagnostic facility. The following faults can be stored in the defect code memory.
In the case of damage, the diagnosis is to be run after the quick test with the test modules of the test schedule.
If no fault is stored in the case of a complaint, select the corresponding document and test module from the function selection. The control unit functions can also be used.