Hydraulic power brake system and method for abs control

Patent metadata

Field	Value
Publication number	US-2019016318-A1
Application number	US-201816012942-A
Country	US
Kind code	A1
Filing date	Jun 20, 2018
Priority date	Jul 11, 2017
Publication date	Jan 17, 2019
Grant date	—

Abstract

A hydraulic power brake system ( 1 ) of a wheeled vehicle or for a vehicle unit has a main brake line ( 20, 21 ), in which a setpoint brake pressure can be controlled via a brake valve ( 4 ) that is operated via a brake pedal ( 7 ), and from which an axle brake line or a wheel brake line ( 46, 49, 50 ) branches off. Inlet valves and outlet valves and a pilot control valve of the ABS control system for the vehicle unit or for each vehicle axle are respectively disposed together in an ABS modulator block ( 69 ), which also includes a temperature sensor ( 70, 71, 72 ) for detecting the oil temperature (T) and a heating element ( 73, 74, 75 ) for locally heating the hydraulic oil are disposed in each ABS modulator block ( 69 ).

First claim

What is claimed is:

1 . A hydraulic power brake system ( 1 ) for a wheeled vehicle unit, comprising:
a main brake line ( 20 , 21 ), configured to provide a setpoint brake pressure controlled via a brake valve ( 4 ) that is operated via a brake pedal ( 7 ), and from which an axle brake line or wheel brake line ( 46 , 49 , 50 ) leading to an actuating unit ( 13 , 15 , 17 , 19 ) of a wheel brake ( 12 , 14 , 16 , 18 ) branches off, a valve arrangement ( 8 ) of an ABS control system, which comprises respectively a hydraulic pressure-controlled inlet valve ( 28 , 34 , 40 ) disposed between the main brake line ( 20 , 21 ) and a respective axle brake line or wheel brake line ( 46 , 49 , 50 ), and a hydraulic pressure-controlled outlet valve ( 30 , 36 , 42 ) disposed between the respective axle brake line or wheel brake line ( 46 , 49 , 50 ) and an unpressurised return line ( 51 , 52 , 53 ), and a electromagnetically operated pilot control valve ( 32 , 33 , 38 , 39 , 44 , 45 ) connected upstream of each inlet valve and outlet valve ( 28 , 30 , 34 , 36 , 40 , 42 ), wherein the inlet valves and outlet valves ( 28 , 30 , 34 , 36 , 40 , 42 ) and the pilot control valves ( 32 , 33 , 38 , 39 , 44 , 45 ) of the ABS control system for the vehicle unit or for each vehicle axle respectively are disposed together in a respective ABS modulator block ( 69 ), wherein a temperature sensor ( 70 , 71 , 72 ) for detecting a local oil temperature T and a heating element ( 73 , 74 , 75 ) for locally heating the hydraulic oil are disposed in each respective ABS modulator block ( 69 ).

2 . The hydraulic power brake system as claimed in claim 1 , wherein the temperature sensor ( 70 , 71 , 72 ) and the heating element ( 73 , 74 , 75 ) are disposed close to the pilot control valves ( 32 , 33 , 38 , 39 , 44 , 45 ) within the respective ABS modulator block ( 69 ).

3 . The hydraulic power brake system as claimed in claim 2 , wherein in at least one of the respective ABS modulator blocks ( 69 ), at the temperature sensor ( 70 , 71 , 72 ) and the heating element ( 73 , 74 , 75 ) are disposed close to the pilot control valves ( 32 , 33 , 38 , 39 , 44 , 45 ) for each pair of inlet valves and outlet valves ( 28 , 30 , 34 , 36 , 40 , 42 ) of the axle brake lines or wheel brake lines ( 46 , 49 , 50 ).

4 . The hydraulic power brake system as claimed in claim 1 , wherein the respective ABS modulator block ( 69 ) is shielded by a thermal insulation against the surroundings, at least in the vicinity of the pilot control valves ( 32 , 33 , 38 , 39 , 44 , 45 ).

5 . The hydraulic power brake system as claimed in any one of claim 1 , wherein the heating element ( 73 , 74 , 75 ) is embodied as an electrical heating body configured to be alternately connected to or disconnected from an electrical power supply of the wheeled vehicle unit via an actuatable electrical switch.

6 . The hydraulic power brake system as claimed in claim 1 , wherein the heating element ( 73 , 74 , 75 ) is embodied as an electrical heating body that is configured to be alternately connected to or disconnected from an electrical power supply of the wheeled vehicle unit in a self-controlling manner via a bimetallic switch that is integrated within the heating element or on a pilot control valve ( 32 , 33 ; 38 , 39 ; 44 , 45 ) depending on a prevailing temperature.

7 . The hydraulic power brake system as claimed in claim 1 , wherein the heating element ( 73 , 74 , 75 ) is embodied as an oil heat exchanger that is alternately connected to or disconnected from a cooling oil circuit of an oil pump of a hydraulic pressure supply system or a combustion engine or a driving gearbox or a working gearbox of the wheeled vehicle unit via an actuatable solenoid valve that is disposed in a feed line or return line of the oil heat exchanger.

8 . The hydraulic power brake system as claimed in claim 1 , wherein the heating element ( 73 , 74 , 75 ) is embodied as a water heat exchanger that is alternately connected to or disconnected from a cooling water circuit of a combustion engine associated with the wheeled vehicle unit via an actuatable solenoid valve that is disposed in a feed line or return line of the water heat exchanger.

9 . A method for ABS control of a hydraulic power brake system ( 1 ) of a wheeled vehicle unit according to claim 1 , the method comprising the steps of
locally measuring the temperature (T) of the hydraulic oil via the temperature sensor ( 73 , 74 , 75 ), and activating the heating element ( 73 , 74 , 75 ) when the measured oil temperature (T) has reached or fallen below a specified switch-on limit value T H _ on , and deactivating the heating element when the detected oil temperature (T) has reached or exceeded a specified switch-off limit value T H _ off that is greater than the switch-on limit value T H _ on .

10 . The method for ABS control as claimed in claim 9 , comprising the further step of deactivating the ABS control system when the detected oil temperature (T) has reached or fallen below a specified operating limit value T ABS _ on that is greater than a minimum limit value T ABS _ min for satisfying predetermined minimum requirements on the ABS control system (T ABS _ on >T ABS _ min ), the minimum limit value T ABS _ min being less than the switch-on limit value T H _ on of the heating element (T ABS _ on <T H _ on ), (T≥T ABS _ on ).

11 . The method for ABS control system as claimed in claim 10 , comprising the further step of outputting a warning signal in a driver's cab associated with the wheeled vehicle unit upon deactivation of the ABS control system.

Assignees

• Wabco Gmbh

Inventors

• Brütt Mirko
• Haverkamp Michael

Classifications

• B60T8/3605

  wherein the pilot valve is mounted in a circuit controlling the working fluid system · CPC title

• B60T8/171 Primary

  Detecting parameters used in the regulation; Measuring values used in the regulation · CPC title

• B60T13/686

  in hydraulic systems or parts thereof · CPC title

• B60T2270/10

  ABS control systems · CPC title

• B60T17/22

  Devices for monitoring or checking brake systems; Signal devices · CPC title