Exhaust gas recirculation flow control system
First Claim
1. In a control valve, a housing having an inlet, and an outlet, said housing defining a chamber therewithin, pressure responsive means dividing said chamber into a first section communicated to a first independent control pressure parameter, a second section communicated to a predetermined pressure level, valve means shiftable from a first condition communicating said second section with said outlet to a second condition, said valve means in said second condition terminating communication between said second section and said outlet but permitting communication between said inlet and said outlet, first means responsive to the pressure differential between said first and second sections to actuate said valve means, and second means responsive to a second independent control pressure for opposing the force generated by said pressure differential created between the first and second sections, said second independent control pressure being affected by the pressure level at said outlet to provide a feedback control on the operation of said valve elements.
3 Assignments
0 Petitions
Accused Products
Abstract
The present invention relates in general to reducing the internal combustion engine exhaust emission polutants. More specifically, it relates to a control device that regulates the amount of exhaust gas being recirculated into the intake manifold of an internal combustion engine such that the exhaust gas recirculation flow is nearly proportional to engine air flow, and is a controlled function of intake manifold vacuum. The flow may be completely inhibited at low engine temperatures and also at times of low manifold vacuum and high engine air flow in order to maintain acceptable driveability.
13 Citations
10 Claims
- 1. In a control valve, a housing having an inlet, and an outlet, said housing defining a chamber therewithin, pressure responsive means dividing said chamber into a first section communicated to a first independent control pressure parameter, a second section communicated to a predetermined pressure level, valve means shiftable from a first condition communicating said second section with said outlet to a second condition, said valve means in said second condition terminating communication between said second section and said outlet but permitting communication between said inlet and said outlet, first means responsive to the pressure differential between said first and second sections to actuate said valve means, and second means responsive to a second independent control pressure for opposing the force generated by said pressure differential created between the first and second sections, said second independent control pressure being affected by the pressure level at said outlet to provide a feedback control on the operation of said valve elements.
Specification