Load dependent control arrangements
AssigneeBendix Westinghouse Limited
InventorDavid John Knight
Life of this patent
Estimating the term…
Abstract
A load dependent control arrangement wherein an electrical load sensor such as a strain gauge controls the mark-to-space ratio of a pulse train output from a pulse generator. The pulse train operates a solenoid valve to control a pneumatic output pressure in proportion to the ratio of marks to spaces. The output pressure may be amplified in a self-lapping pneumatic relay valve. The final output pressure may be utilized in any suitable manner, for example, in operating the pneumatic brakes of a vehicle whose load is being measured by the sensor.
Claims32
A load sensing arrangement comprising:
- load sensor means for generating an analogue electric signal dependent on a load;
- electric signal conversion means coupled to said load sensor means for converting said analogue signal to a binary signal having a mark-to-space ratio dependent on the magnitude of said analogue signal;
- electrically operated fluid valve means coupled to said conversion means to alternately open and close a fluid valve in accordance with the marks and spaces in said binary signal;
- a source of predetermined fluid pressure coupled to said fluid valve means to have said predetermined fluid pressure alternately passed and blocked by the opening and closing of said valve to produce an output of said fluid valve means which is dependent both on said predetermined pressure and on said load.
A load-dependent braking system comprising:
- fluid pressure control means for generating a fluid pressure which is dependent on a desired degree of braking of a vehicle;
- load sensor means for generating an analogue electric signal dependent on the load of the vehicle;
- electric signal conversion means coupled to said load sensor means for converting said analogue signal to a binary signal having a mark-to-space ratio dependent on the magnitude of said analogue signal;
- electrically operated fluid valve means coupled to said conversion means to alternately open and close a fluid valve in accordance with the marks and spaces in said binary signal;
- said fluid pressure control means being coupled to said fluid valve means to have said generated fluid pressure alternately passed and blocked by the opening and closing of said valve to produce an output of said fluid valve means which is dependent both on said desired degree of braking of a vehicle and on the load of said vehicle.
Dependencies are inferred from the claim text.