Trailer braking in electronically controlled braking systems
AssigneeLucas Industries public limited company
InventorsMalcolm Brearley, Richard B. Moseley
Life of this patent
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Abstract
An electronic braking system (EBS) for a towing vehicle which provides for trailer service brake pressure supply via an additional EBS sub-system, and wherein, in order to speed up the application of trailer braking, the electrical signal representing the driver's braking demand is processed to generate an additional pressure pre-pulse of predetermined amplitude to pressurise the trailer braking circuit in advance of the proportional pressure setting determined by the driver. The pre-pulse is made up of two parts, a preset fixed duration pulse followed without break by a variable duration continuation pulse. The variable duration of the variable duration pulse is determined primarily by the rate of increase of the driver's demand signal.
Claims7
An electronic braking system (EBS) for a towing vehicle, having provision for a controlled braking pressure supply for a trailer vehicle having its own braking circuit, comprising:
- (a) a driver's braking demand transducer for producing an electrical signal representative of the braking demand level;
- (b) at least one pressure control channel adapted to be controlled by the driver's demand signal for controlling the extent of braking of the towing vehicle in proportion to the magnitude of said braking demand signal;
- (c) a separate EBS sub-system for providing controlled braking pressure to the braking circuit of the trailer;
- and
- (d) means in said EBS sub-system for the trailer for producing said electrical signal representing the driver's braking demand to generate a pressure speed-up pulse, at least a part of which is of preset fixed duration, which pulse is directed to the trailer to pressurize the trailer braking circuit in advance of the start to the proportional pressure control which follows the braking demand set by the driver.
An electronic braking system (EBS) for a towing vehicle, having provisions for a controlled braking pressure supply for a trailer vehicle fitted with its own braking circuit, comprising:
- (a) a driver's braking demand transducer for producing an electrical signal representative of the braking demand level;
- (b) at least one pressure control demand adapted to be controlled by the driver's demand signal for controlling the extent of braking of the towing vehicle in proportion to the magnitude of said braking demand signal;
- (c) a separate EBS sub-system for providing controlled braking pressures to the braking circuit at the trailer;
- and
- (d) a means in said EBS sub-system for the trailer for processing said electrical signal representing the driver's braking demand to generate a pressure speed-up pulse which is directed to the trailer to pressurize the trailer braking circuit in advance of the start of the proportional control which follows the braking demand set by the driver, said pulse being made of two parts, a preset fixed duration part followed without a break by a variable duration part whose variable duration is determined in response to the rate of change of the driver's demand signal.
Dependencies are inferred from the claim text.