| 摘要 |
PCT No. PCT/DE82/00006 Sec. 371 Date Aug. 19, 1982 Sec. 102(e) Date Aug. 19, 1982 PCT Filed Jan. 7, 1982 PCT Pub. No. WO82/04019 PCT Pub. Date Nov. 25, 1982.To determine aquaplaning or, in general, the adhesion factor of tires of a vehicle on a road surface, test braking pressure (p1, p2, p3, p4) is applied to a wheel or wheels, preferably the rolling wheels, of a vehicle. Wheel slip, that is, difference between deceleration of a wheel and deceleration of the vehicle is determined upon application of the test pressure, and an output signal is generated, indicated of wheel slippage, if a given wheel slip occurs at a test pressure below that which would be expected on a gripping or rough surface, so that wheel slippage with respect to the road surface is determined early. The test braking cycle can be initiated manually (switch 12) by an operator, from time to time, and, preferably, can be commanded automatically by an antibrake lock system (ABS, 10) by applying a braking pressure well below that required, for example, for vehicle operation under traffic conditions, and merely to determine wheel slippage.
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