Boots – shoes – and leggings
Patent
1991-10-10
1994-07-26
Black, Thomas G.
Boots, shoes, and leggings
36442602, 303100, G06F 1548, B60T 858
Patent
active
053331087
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to systems of the type where slippage of the driven wheels is controlled by monitoring the wheel speeds to determine slippage and generating control signals for braking the driven wheels and limiting engine torque when slippage is determined. They use the wheel acceleration of the driven. Drive slip control systems having the features of the preamble of claim 1 are known. They use the wheel acceleration of the driven wheels and/or the wheel slippage of the driven wheels obtained by means of the speed signals of the non-driven wheels to actuate control. In order to avoid control errors caused by interference suppressing the wheel speeds, e.g. wheel-induced vibrations, it is known to reduce these interferences by filtering.
U.S. Pat. No. 4,760,893 discloses deriving the reference value needed to determine slippage from the speeds of the non-driven wheels. The reference value is observed for physically impossible changes and disregarded when this occurs.
SUMMARY OF THE INVENTION
The inventive solution of the problem provides a control that is improved and more effective as compared to known solutions. The quotient of the engine speed and the average speed of the driven wheels determined from the sensed speeds thereof is compared to a reference quotient and a signal is generated when the deviation exceeds a prescribed amount. The signal prompts the use of a reference wheel speed determined from the engine speed and the instantaneous gear ratio to determine slippage. The reference wheel speed may be used to replace the sensed wheel speed or to limit the acceleration derived from the sensed wheel speeds. In the latter case the limited wheel accelerations are used to determine slippage, i.e., tendency of the wheels to spin. This invention ensures that the use of the recognition of such vibrations does not negatively affect the control. (The control does not enhance the wheel vibrations).
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagram of the inventive system
FIG. 2 is a detailed partial diagram of a possible evaluation circuit of FIG. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In FIG. 1, the wheel speed sensors 1, 2 determine the speeds of the driven wheels of a vehicle, and the sensors 3, 4 determine the speeds of the non-driven wheels. An evaluation circuit 5 converts the sensor signals into control signals to avoid drive slippage, two valves 6, 7 varying the brake pressure of the driven wheels, and a modifier element 8 changing the engine torque.
In order to carry out the control in a known way, the evaluation circuit 5 can use the wheel slippage as well as wheel acceleration and deceleration.
If interference vibrations are superimposed on the sensor signals, these vibrations simulate acceleration and deceleration as well as wheel slippage which activate and change control.
Here the invention sets in. The engine speed sensed by an engine speed sensor 9 and the averaged speed V.sub.m of the driven wheels determined in a mean value generator 10 are used to determine an actual quotient Q in block 11. This quotient is proportional to n/V.sub.m (or V.sub.m
). In vehicles with a stick shift, when a gear is energized and without interference, this quotient is a gear-dependent constant, i.e. there are as many constant values as there are gears (desired quotient). These values are stored in a memory 12. In a comparator 13, the quotient determined in block 11 is compared to the closest value stored in memory 12. If there is a deviation greater than an allowed tolerance, an interference is indicated and comparator 13 supplies an output signal. Comparator 13 is adjusted such that this output signal corresponds to the reference quotient just selected. In a multiplier 14, a reference wheel speed signal is formed from the engine speed and the given reference quotient. This signal is supplied to the evaluation circuit 5 where it is used as an instantaneous wheel speed for slippage formation or acceleration/deceleration determination and for control
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Folke Reiner
Hessmert Ulrich
Meissner Manfred
Meurer Martin
Black Thomas G.
Nguyen Tan Q.
Robert & Bosch GmbH
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