Electro-Hydraulic Steering System EHPS
Electro-hydraulic steering system EHPS
For the first time in a MINI, an electro-hydraulic steering system is being used.
Design
Electric drive - motor with control module
Hydraulic pump
Oil tank
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 module.
The speed of the electric motor is controlled in the EHPS control module, 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 230 �F (110 �C).
When the EHPS control module detects the end of the steering maneuver or, for example, detects that a wheel has hit the curb, 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 module with diagnostic facility. The following faults can be stored in the fault memory.
Power supply fault
Electric motor fault
Fault caused by excess temperature
Control module fault
In the case of damage, the diagnosis is to be run after the short test with the test modules of the suggested test plan.
If no fault is stored in the case of a complaint, select the corresponding document and test module from the function selection. The control-module functions can also be used.