Mercedes develops acceleration control
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MERCEDES-BENZ is set to become the first truck and bus manufacturer to offer an anti-lock brake system with automatically-controlled drive-wheel slip during acceleration.
The system, called ASR (from the German for acceleration skid control — antriebs schulpf regelung), has been developed jointly with Wabco, the American Standard subsidiary, which, since 1981, has been supplying Mercedes with ABS anti-lock systems for trucks and buses.
ASR will become an option on all ABS-equipped rearwheel-drive Mercedes buses and trucks above six tonnes GVW in West Germany from later this year but is not likely to become available in the UK until 1987.
It will also be available as a retrofit kit.
The extra cost of AS12 has yet to be finalised, but Mercedes engineers in Germany are talking in terms of about 000 more than for a standard ABS system.
ASR employs one extra solenoid valve per A BS controlled axle, although neither additional brake modulator valves nor wheel speed sensors are needed.
When excessive wheel slip during acceleration is sensed, by comparing the speed of
each dm L. wheel with its di gonally opposite front whee the ABS/ASR electroni control unit gradually applie and releases the brake on tI, spinning wheel until tractio improves.
If both drive wheels spin, pneumatic control cylinde fitted in the accelerato linkage is signalled to reduc engine speed, regardless of as celerator pedal position, unt traction improves.
Wabco will be offering th system, which it originall called drive slip control, t other vehicle manufacturem who currently use its ABS in dividual wheel control anti lock.