Anti-locking system for a two-wheel road vehicle with hydraulic dual circuit braking installation
First Claim
1. An anti-locking system for a two-wheel road vehicle having a hydraulic dual circuit braking installation, a front wheel brake and a rear wheel brake, with a wheel rotational speed sensor means provided individually for the front and rear vehicle wheels, means for generating deceleration signals respectively therefor and with braking pressure control means, the braking pressure control means having braking pressure control valves for controlling the front wheel brake and rear wheel brake, the braking pressure control valves having at least a pressure maintaining position and a pressure reduction position,first comparator means receiving said front wheel deceleration signal bF and comprisingfirst means transmitting a signal when front wheel deceleration bF exceeds a threshold value bF1 for driving the pressure control valve means into the pressure maintaining position and second means transmitting a signal when front wheel deceleration bF exceeds a second threshold value bF2 which is greater than the threshold value bF1 for driving the pressure control valve means into the pressure reduction position,second comparator means receiving said rear wheel deceleration signal bR and comprisingthird means transmitting a signal when rear wheel deceleration bR is greater than a threshold value bR1 for driving the pressure control valve means into the pressure maintenance position, and fourth means transmitting a signal when rear wheel deceleration bR is greater than a second threshold value bR2 which is greater than threshold value bR1 for driving the pressure control valve means into the pressure reduction position,a processing means receiving front wheel rotation speed signals and rear wheel rotation speed signals for generating a front brake slip signal λ
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F and a rear wheel brake slip signal λ
R, said signals λ
F and λ
R being referenced to a reference velocity vr,third comparator means receiving said front and rear brake slip signals λ
F and λ
R and comprisingfifth means transmitting a signal when front brake slip λ
F is greater than or equal to a value which is less than the rear wheel brake slip λ
R by an amount D1 for driving the pressure control valve means into the pressure maintaining position,sixth means generating a signal when front wheel brake slip λ
F differs from the rear wheel brake slip λ
R only by an amount d which is smaller than D1 for driving the braking pressure control valves into the pressure reduction position,seventh means transmitting a signal when front wheel braking slip λ
F equals or exceeds a first threshold value λ
F1 for driving the braking pressure control valves into the pressure maintaining position, and
1 Assignment
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Accused Products
Abstract
An anti-locking system is provided for a two-wheel road vehicle which is equipped with electro-hydraulic braking pressure control equipment, which generates the driving signals necessary for appropriate driving or braking pressure control valves by processing wheel rotational speed sensor output signals. In order to obtain both good braking effect and good driving stability when the control equipment responds, the brake slip λF of the front wheel is controlled to a value which is always less than the rear wheel brake slip λR. The control responds if, on the one hand, critical values of the wheel deceleration are exceeded and/or, on the other hand, if the brake slip λF on the front wheel exceeds a threshold value still considered as permissible. As part of the anti-locking system, the braking installation is so designed that for both manual actuation and pedal actuation both wheel brake circuits respond with the installed braking force distribution. This is so arranged that for adhesion coefficients of more than 0.3 between the track and the wheel, the rear wheel would lock before the front wheel should the control equipment not operate.
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Citations
10 Claims
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1. An anti-locking system for a two-wheel road vehicle having a hydraulic dual circuit braking installation, a front wheel brake and a rear wheel brake, with a wheel rotational speed sensor means provided individually for the front and rear vehicle wheels, means for generating deceleration signals respectively therefor and with braking pressure control means, the braking pressure control means having braking pressure control valves for controlling the front wheel brake and rear wheel brake, the braking pressure control valves having at least a pressure maintaining position and a pressure reduction position,
first comparator means receiving said front wheel deceleration signal bF and comprising first means transmitting a signal when front wheel deceleration bF exceeds a threshold value bF1 for driving the pressure control valve means into the pressure maintaining position and second means transmitting a signal when front wheel deceleration bF exceeds a second threshold value bF2 which is greater than the threshold value bF1 for driving the pressure control valve means into the pressure reduction position, second comparator means receiving said rear wheel deceleration signal bR and comprising third means transmitting a signal when rear wheel deceleration bR is greater than a threshold value bR1 for driving the pressure control valve means into the pressure maintenance position, and fourth means transmitting a signal when rear wheel deceleration bR is greater than a second threshold value bR2 which is greater than threshold value bR1 for driving the pressure control valve means into the pressure reduction position, a processing means receiving front wheel rotation speed signals and rear wheel rotation speed signals for generating a front brake slip signal λ -
F and a rear wheel brake slip signal λ
R, said signals λ
F and λ
R being referenced to a reference velocity vr,third comparator means receiving said front and rear brake slip signals λ
F and λ
R and comprisingfifth means transmitting a signal when front brake slip λ
F is greater than or equal to a value which is less than the rear wheel brake slip λ
R by an amount D1 for driving the pressure control valve means into the pressure maintaining position,sixth means generating a signal when front wheel brake slip λ
F differs from the rear wheel brake slip λ
R only by an amount d which is smaller than D1 for driving the braking pressure control valves into the pressure reduction position,seventh means transmitting a signal when front wheel braking slip λ
F equals or exceeds a first threshold value λ
F1 for driving the braking pressure control valves into the pressure maintaining position, and - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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F and a rear wheel brake slip signal λ
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2. eigth means transmitting a signal when front wheel brake slip λ
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F is greater than a second threshold value λ
F2 which is greater than the threshold value λ
F1 for driving the pressure control valve means into the pressure reduction position.
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F is greater than a second threshold value λ
Specification