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US 6,142,582 AGranted
Hydraulic vehicle brake system
AssigneeVolvo Wheel Loaders AB
InventorBo Karlsson
Life of this patent
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Abstract
A hydraulic vehicle brake system, especially for wheeled vehicles, in which a triggered alarm for excessively low pressure in a brake circuit is maintained and where the alarm can be reset first after a pressure sensor coordinated with the brake circuit downstream of the brake valve unit, registers a pressure in the circuit which exceeds a predetermined minimum pressure level.
Claims6
Hydraulic vehicle brake system, comprising:
- a pump-fed hydraulic pressure accumulator unit (10) for selective feeding of a hydraulic pressure medium to at least one brake circuit (18,20) via an operable brake valve unit (28),
- a first pressure sensor (32) which is arranged, when the pressure in the pressure accumulator unit (10) is below a predetermined pressure level, to activate a warning unit (34) for triggering an alarm,
- a means (36;50) coordinated with said warning unit for maintaining a triggered alarm therein, and
- a second pressure sensor (40,42) coordinated with a brake circuit section (18b,20b) downstream of the brake valve unit (28),
- said second pressure sensor being arranged to deactivate the triggered warning unit (34) first when a minimum pressure level has been exceeded in the brake circuit section downstream of the brake valve unit (28) when operating the latter to an open position.
2 more elements
Hydraulic vehicle brake system comprising:
- two brake circuits (18,20),
- a pump-fed hydraulic pressure accumulator unit (10) for selective feeding of a hydraulic pressure medium to said brake circuits via an operable brake valve unit (28),
- a first pressure sensor (32) which is arranged, when the pressure in the pressure accumulator unit (10) is below a predetermined pressure level, to activate a warning unit (34) for triggering an alarm,
- a means (36;50) coordinated with said warning unit for maintaining a triggered alarm therein, and
- a second alarm-deactivating pressure sensor (40,42) coordinated with at least one of two brake circuit sections (18b,20b) downstream of the brake valve unit (28),
- said second alarm-deactivating pressure sensor being arranged to deactivate the triggered warning unit (34) first when a minimum pressure level has been exceeded in the respective brake circuit sections downstream of the brake valve unit (28) when operating the latter to an open position.
3 more elements
Dependencies are inferred from the claim text.