Internal-combustion engines – Charge forming device – Gaseous fuel and air mixer
Patent
1982-12-14
1985-04-30
Cross, E. Rollins
Internal-combustion engines
Charge forming device
Gaseous fuel and air mixer
123478, 123480, 261 69R, 251 615, F02M 1306
Patent
active
045137285
ABSTRACT:
A motor vehicle fuel system operable selectively to supply metered quantities of petrol or LPG in its gaseous state to a carburetter induction passage. The LPG system includes a single stage pressure regulator and an injection valve which may be a digital or an analogue valve. The regulator operates to vary the pressure of gaseous LPG with variations in engine loading by referring that pressure across a single diaphragm to the pressure established in the induction passage downstream of the throttle valve by operation of the engine, while maintaining that regulated gas pressure above that subsisting in the induction passage upstream of the throttle valve. An electronic control system, which may be an analogue control system or a digital control system incorporating a microprocessor having a data store matrix, responds to certain engine operating conditions and controls operation of the injection valve whereby the latter injects metered quantities of gaseous LPG for presentation to the induction passage upstream of the throttle valve in accordance with the requirements of the engine. If a digital injection valve is used, provision is preferably made for smoothing the pulsed output of that valve before it is presented to the induction passage.
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Clarke Peter J.
Marriage David J.
Pagdin Brian C.
Shadbolt Colin F.
Sheppard Ian J.
Cross E. Rollins
Solex (U.K.) Limited
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