BMW 7_aya the E38 series from 1994 to 2002
1. Introduction
2. Governing bodies and methods of operation
2.1. Access, protection
2.2. Elements of security systems
2.3. Car equipment, arrangement of devices and governing bodies
2.4. Devices of ensuring comfort
2.5. Methods of operation and auxiliary systems
2.5.1. Start and switching off of the engine, start of motion
2.5.2. Car running in
2.5.3. Use of the automatic transmission (AT)
2.5.4. Brake system
2.5.5. Features of operation of the cars equipped with the catalytic converter
2.5.6. Auxiliary systems
3. Settings and routine maintenance of the car
4. Engine
5. Cooling systems of the engine, heating, ventilation and air conditioning
6. A power supply system and production of the fulfilled gases
7. Systems of electric equipment of the engine
8. Manual box of gear shifting and coupling
9. Automatic transmission
10. Cardan and power shafts, reducer, differential and stupichny assemblies
11. Brake system
12. Suspension bracket and steering
13. Body
14. Onboard electric equipment
15. Schemes of electric equipment


2.5.6. Auxiliary systems


Sensors on wheels determine their angular speeds. On this basis the control system draws a conclusion about pro-slipping of driving wheels. Depending on road conditions two mechanisms of adjustment are used. At big surplus of power and, therefore, pro-slipping of driving wheels the torque of the engine goes down. In addition to it and without intervention of the driver the automatic podtormazhivaniye of the slipping driving wheel is made. Thereby the effect, comparable with effect of adjustable self-locking differential is reached. The similar podtormazhivaniye is possible at a speed up to 40 km/h. At a speed over 40 km/h, but no more than 100 km/h for increase in force of draft are used a podtormazhivaniye of smaller intensity.


The regulator installed on the back bridge provides a constant road gleam at any loading of the car.

For this purpose on the back bridge instead of ordinary shock-absorbers and steel springs pneumatic depreciation racks are established. The electronic control system determines by two sensors the actual height of a body over the road and if necessary connects the compressor which is pumping up compressed air in racks.

Thanks to increase in pressure at increase in loading the regulator not only provides a constant road gleam, but also comfortable depreciation at the movement irrespective of loading of the car.

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2.5.5. Features of operation of the cars equipped with the catalytic converter
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3. Settings and routine maintenance of the car