The need for convenience and the increasing safety requirements, following the more and more widespread use of power-window units, electronic seat or mirror adjustment and air-conditioning, have finally led to development of the electric park brake. Whereas the basic concept remains the same for all vehicles, in future there will be differences between the vehicle manufacturers concerning the functions and the operating concepts. For this the electric park brake offers numerous possibilities. As with all new electric systems, when it is first introduced into serial production a direct cost advantage cannot be expected, but in the long term the product has corresponding potential, particularly if it is controlled from one of the chassis control units. The idea of pulling on the existing brake cables with electric actuators is more than 20 years old. For TRW, installation advantages at equal costs have led the development of a solution, which is integrated in the brake calliper. The two actuators, which are mounted on the brake calliper, are controlled via a separate control unit. The control unit is connected to the power supply via two lines with 30 A fuses. The redundant control element is connected directly to the control unit. The electronics receives all necessary signals tram the CAN network. Separate control of the warning lamp is provided. The system is designed for 100,000 load alterations with full clamping force. The full clamping force must always be generated, because responsibility passes tram the driver to the vehicle manufacturer and after 'ignition off' essential conditions for parking may change. The lifetime calculations and tests ware carried out with a superimposed braking pressure of 40 bar, because it is assumed that the driver who is parking on a hill is still depressing the service brake pedal. The result is a greater bridge thickness of the brake.
Design and control of an electric park brake
Konstruktion und Regelung einer elektrischen Feststellbremse
2001
5 Seiten, 7 Bilder
Conference paper
English
Design and control of an electric park brake
Automotive engineering | 2002
|Design and Control of an Electric Park Brake
SAE Technical Papers | 2002
|