Patent ID: 6443175
Filing Date: 2002-09-03
Classification: F04F,Y10T

Abstract:
A vacuum generation and control device for use with an independent pressure source, the vacuum control device comprising:a. a master control valve, having a master control pressure inlet coupled to a master control pressure exhaust, the master control valve controllable by a first transducer that enables selection of, a first state that retards pressure exchange between the master control pressure inlet and the master control pressure exhaust and, a second state that enables pressure exchange between the master control pressure inlet and the master control pressure exhaust, the master control pressure inlet coupled to the independent pressure source, b. a master pressure valve, having a master pressure inlet coupled to a master pressure exhaust, the master pressure valve controllable by a first pressure sensor that is coupled to the master control pressure exhaust and that enables selection of, a first state that retards pressure exchange between the master pressure inlet and the master pressure exhaust and, a second state that enables pressure exchange between the master pressure inlet and the master pressure exhaust, the master pressure inlet also coupled to the master control pressure exhaust; c. a vacuum pressure generator, having a positive pressure inlet coupled to a positive pressure exhaust and a vacuum pressure port, the positive pressure inlet coupled also to the master pressure exhaust of the master pressure valve; d. a feedback pressure valve, having a feedback pressure inlet coupled to a feedback pressure exhaust, the feedback pressure valve controllable by a second pressure sensor that is coupled to the vacuum pressure port and that enables selection of, a first state that retards pressure exchange between the feedback pressure inlet and the feedback pressure exhaust and, a second state that enables pressure exchange between the feedback pressure inlet and the feedback pressure exhaust; e. a feedback-control pressure valve, having a feedback-control pressure inlet coupled to a feedback-control pressure exhaust, the feedback-control pressure valve controllable by a second transducer that enables selection of, a first state that retards pressure exchange between the feedback-control pressure inlet and the feedback-control pressure exhaust, and a second state that enables pressure exchange between the feedback-control pressure inlet and the feedback-control pressure exhaust, the feedback-control pressure inlet coupled to the independent pressure source and the feedback-control pressure exhaust coupled to the feedback pressure inlet; and f. a check valve coupled between feedback pressure exhaust and the first pressure sensor, the check valve permitting unidirectional flow of feedback pressure to the first pressure sensor.