Modulator for anti-skid braking system
First Claim
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1. In an anti-skid braking system for modifying the action of a brake application means for a braked wheel of a vehicle, said system including means for utilizing information obtained from the rotation of said wheel to generate an input signal indicative of a braking condition;
- modulator means, responsive to the input signal, for generating a modulated brake control signal;
means, included in the modulator means, for generating a rate signal as a function of both the input signal and a threshold signal;
means, included in the modulator means, for generating the modulated brake control signal as a time integral function of the rate signal; and
means, responsive to the modulated brake control signal, for modifying the action of the brake application means;
the improvement comprising;
means, included in the modulator means, for generating the threshold signal as a function of a velocity signal generally indicative of the velocity of the braked wheel.
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Abstract
An improved modulator for an anti-skid brake control system generates a modulated brake control signal as a time integral function of the difference between an input signal indicative of a braking condition and a variable threshold signal. The preferred embodiment includes a computer which stores a number of threshold signals. An appropriate one of these threshold signals is selected depending on the magnitude of the velocity of the braked wheel.
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Citations
18 Claims
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1. In an anti-skid braking system for modifying the action of a brake application means for a braked wheel of a vehicle, said system including means for utilizing information obtained from the rotation of said wheel to generate an input signal indicative of a braking condition;
- modulator means, responsive to the input signal, for generating a modulated brake control signal;
means, included in the modulator means, for generating a rate signal as a function of both the input signal and a threshold signal;
means, included in the modulator means, for generating the modulated brake control signal as a time integral function of the rate signal; and
means, responsive to the modulated brake control signal, for modifying the action of the brake application means;
the improvement comprising;means, included in the modulator means, for generating the threshold signal as a function of a velocity signal generally indicative of the velocity of the braked wheel. - View Dependent Claims (2, 3, 4, 5, 6)
- modulator means, responsive to the input signal, for generating a modulated brake control signal;
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7. In an anti-skid braking system for modifying the action of a brake application means for a braked wheel of a vehicle;
- said system including means for generating a wheel signal indicative of rotational velocity of the braked wheel;
means, responsive to the wheel signal, for generating an input signal indicative of a braking condition;
modulator means, responsive to the input signal, for generating a modulated brake control signal;
means, included in the modulator means, for generating a rate signal as a function of the sum of the input signal and a threshold signal;
means, included in the modulator means, for generating the modulated brake control signal as a time integral function of the rate signal; and
means, responsive to the modulated brake control signal, for modifying the action of the brake application means;
the improvement comprising;means, included in the modulator means and responsive to the wheel signal, for generating the threshold signal as a function of the wheel signal, wherein the function of the wheel signal is chosen to promote effective control of the action of the brake application means. - View Dependent Claims (8, 9, 10, 11, 12)
- said system including means for generating a wheel signal indicative of rotational velocity of the braked wheel;
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13. In an anti-skid braking system for modifying the action of a brake application means for a braked wheel of a vehicle;
- said system including means for generating a wheel signal indicative of rotational velocity of the braked wheel;
means, responsive to the wheel signal, for generating an input signal indicative of a braking condition;
modulator means, responsive to the input signal, for generating a modulated brake control signal;
means, included in the modulator means, for generating a rate signal as a function of an algebraic combination of a selected threshold signal and the input signal;
means, included in the modulator means, for generating the modulated brake control signal as a time integral function of the rate signal; and
means, responsive to the modulated brake control signal, for modifying the action of the brake application means;
the improvement comprising;a computer; means, included in the computer, for storing a plurality of alternative threshold signals; and means, included in the computer, for selecting one of the plurality of alternative threshold signals in response to the amplitude of the wheel signal and for supplying the selected threshold signal to the rate generating means, said plurality of alternative threshold signals chosen such that the selected threshold signal is matched to the vehicle and braked wheel to promote effective control of the action of the brake application means. - View Dependent Claims (14, 15, 16, 17, 18)
- said system including means for generating a wheel signal indicative of rotational velocity of the braked wheel;
Specification