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US 7,114,787 B2Granted
Braking system for trailers of utility vehicles
AssigneeKNORR-BREMSE Systeme fuer Nutzfahrzeuge GmbH
InventorsMartin Mederer, Ansgar Fries, Gergely Szabo, Matthew Fry
Life of this patent
Estimating the term…
Abstract
The brakes of the front axle of the trailer of a utility vehicle are impinged upon with a brake pressure by way of a single, common ABS valve. Said ABS valve is electrically actuated by an EBS module associated with the rear wheel brakes depending on a differential slip between the front axle and the rear axle.
Claims25
Braking system for a utility vehicle trailer having a steerable front axle, the system comprising:
- front axle brake cylinders, rear axle brake cylinders, and rotational wheel speed sensors;
- an ABS valve assigned jointly to both front axle brake cylinders for controlling brake pressure into the front axle brake cylinders;
- an EBS module assigned to the rear axle brake cylinders for controlling brake pressure into the rear axle brake cylinders;
- an electric control output of the EBS module coupled with an electric control input of the ABS valve;
- wherein the rotational wheel speed sensors are connected to the EBS module for determining a differential slip (Δs) between the steerable front axle and a rear axle of the trailer;
- wherein the EBS module controls the ABS valve as a function of the determined differential slip (Δs);
- and
- wherein the differential slip (Δs) is determined from a mean front axle speed (vVA) and a front axle reference speed (vVA,Ref), according to the formula:
- Δ
-
-
- s
- =
- v
- VA
- -
- v
- VA
- ,
- Ref
- v
- VA
- ,
- Ref
- =
- v
- VA
- v
- VA
- ,
- Ref
- -
- 1.
30 more elements
Braking system for a utility vehicle trailer having a steerable front axle, the system comprising:
- front axle brake cylinders, rear axle brake cylinders, and rotational wheel speed sensors;
- an ABS valve assigned jointly to both front axle brake cylinders for controlling brake pressure into the front axle brake cylinders;
- an EBS module assigned to the rear axle brake cylinders for controlling brake pressure into the rear axle brake cylinders;
- an electric control output of the EBS module coupled with an electric control input of the ABS valve;
- wherein the rotational wheel speed sensors are connected to the EBS module for determining a differential slip (Δs) between the steerable front axle and a rear axle of the trailer;
- wherein the EBS module controls the ABS valve as a function of the determined differential slip (Δs);
- and
- wherein the ABS valve has a control input coupled with a pneumatic control line, and further wherein, in the case of a disturbance of the EBS module, the ABS valve controls a brake pressure defined by a driver by way of the pneumatic control line into the front axle brake cylinders.
5 more elements
Braking system for a utility vehicle trailer having a steerable front axle, the system comprising:
- front axle brake cylinders, rear axle brake cylinders, and rotational wheel speed sensors;
- an ABS valve assigned jointly to both front axle brake cylinders for controlling brake pressure into the front axle brake cylinders;
- an EBS module assigned to the rear axle brake cylinders for controlling brake pressure into the rear axle brake cylinders;
- an electric control output of the EBS module coupled with an electric control input of the ABS valve;
- wherein the rotational wheel speed sensors are connected to the EBS module for determining a differential slip (Δs) between the steerable front axle and a rear axle of the trailer;
- wherein the EBS module controls the ABS valve as a function of the determined differential slip (Δs);
- and
- wherein in the case of a disturbance of one or more of the rotational wheel speed sensors, the ABS valve is controlled such that a front axle brake pressure (pVA) is identical with the rear axle brake pressure (pVA) controlled in by the EBS module.
5 more elements
A braking method for a utility vehicle trailer having a steerable front axle, the braking method comprising the acts of:
- controlling brake pressures into front axle brake cylinders via a single joint ABS valve;
- controlling brake pressures into rear axle brake cylinders via an EBS module, said EBS module being electrically coupled with the ABS valve;
- determining a differential slip value between the steerable front axle and a rear axle via the EBS module;
- controlling the ABS valve via the EBS module as a function of the determined differential slip value;
- and
- wherein for controlling the ABS valve, the EBS module determines a desired front axle brake pressure (pVA) as a function of a control pressure defined by a driver, the control pressure being defined by the driver by way of a pneumatic control line, or a momentarily controlled-in rear axle brake pressure (pVA) and a momentary differential slip (ΔVA).
3 more elements
A braking method for a utility vehicle trailer having a steerable front axle, the braking method comprising the acts of:
- controlling brake pressures into front axle brake cylinders via a single joint ABS valve;
- controlling brake pressures into rear axle brake cylinders via an EBS module, said EBS module being electrically coupled with the ABS valve;
- determining a differential slip value between the steerable front axle and a rear axle via the EBS module;
- controlling the ABS valve via the EBS module as a function of the determined differential slip value;
- and
- wherein the differential slip (Δs) is determined from a mean front axle speed (vVA) and a front axle reference speed (vVA,Ref), according to the formula:
- Δ
-
-
- s
- =
- v
- VA
- -
- v
- VA
- ,
- Ref
- v
- VA
- ,
- Ref
- =
- v
- VA
- v
- VA
- ,
- Ref
- -
- 1.
28 more elements
Dependencies are inferred from the claim text.