BMW 7_ая the E38 series from 1994 to 2002
1. Introduction
2. Governing bodies and operation receptions
2.1. Access, protection
2.2. Elements of systems of safety
2.3. Car equipment, arrangement of devices and governing bodies
2.4. Devices of ensuring comfort
2.5. Receptions of operation and auxiliary systems
2.5.1. Start and engine switching off, start of motion
2.5.2. Car running in
2.5.3. Use of 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. Systems of cooling 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. Kardanny and power shafts, reducer, differential and stupichny assemblies
11. Brake system
12. Suspension bracket and steering
13. Body
14. Onboard electric equipment
15. Electric equipment schemes



2.5.6. Auxiliary systems


Sensors on wheels define 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 capacity and, therefore, pro-slipping of driving wheels the engine torque goes down. In addition to it and without intervention of the driver the automatic podtormazhivaniye of a slipping driving wheel is made. Thereby the effect, comparable with effect of adjustable being self-blocked differential is reached. The similar podtormazhivaniye is possible at speed to 40 km/h. At speed 40 km/h are higher, but no more than 100 km/h for increase in force of draft are used a podtormazhivaniye of smaller intensity.


The regulator established 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 amortization racks are established. The electronic monitoring 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 pressure increase at increase in loading the regulator not only provides a constant road gleam, but also comfortable amortization at movement irrespective of car loading.

«previous page
2.5.5. Features of operation of the cars equipped with the catalytic converter
following page»
3. Settings and routine maintenance of the car