Back to results
US 10,744,982 B2Granted
Hydraulic power brake system and method for abs control
AssigneeWABCO GmbH
InventorsMirko Brütt, Michael Haverkamp
Life of this patent
Estimating the term…
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).
Claims14
A hydraulic power brake system (1) for a wheeled vehicle unit, comprising:
- a pressure oil source (24) supplying pressurized hydraulic oil serving as pressure medium,
- a main brake line (20, 21), configured to provide a setpoint brake pressure controlled via a brake valve (4) that is downstream of the pressure oil source and 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 respective pressure control line with an electromagnetically operated pilot control valve (32, 33, 38, 39, 44, 45) connected to a control input (29, 35, 41, 31, 37, 43) of each inlet valve and outlet valve (28, 30, 34, 36, 40, 42), wherein each respective pressure control line is connected to the pressure source (24) by bypassing the brake valve (4),
- wherein the inlet valve and outlet valve (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).
1 more element
A method for ABS control of a hydraulic power brake system (1) of a wheeled vehicle unit having:
- a pressure oil source (24) supplying pressurized hydraulic oil;
- a main brake line (20, 21), configured to provide a setpoint brake pressure controlled via a brake valve (4) that is downstream of the pressure oil source and 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) controlling a control pressure line (57, 58, 59, 60, 61, 62) providing a hydraulic control pressure to control 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);
- the method comprising the steps of
- locally measuring the temperature (T) of the hydraulic oil in the control pressure line via the temperature sensor (73, 74, 75), and
- activating the heating element (73, 74, 75) when the measured oil temperature (T) locally measuring the temperature (T) of the hydraulic oil in the control pressure line has reached or fallen below a specified switch-on limit value TH_on, and deactivating the heating element when the detected oil temperature (T) has reached or exceeded a specified switch-off limit value TH_off that is greater than the switch-on limit value TH_on.
4 more elements
Dependencies are inferred from the claim text.