Air/fuel induction system for a multi-cylinder internal combustion engine

Patent 4545345 Issued on October 8, 1985. Estimated Expiration Date:

November 28, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventors

Assignee

Solex

Application

No. 06/555406 filed on 11/28/1983

US Classes:

123/299, Using multiple injectors or injections123/448, Sequential distributor123/478, Actuator circuit (e.g., engine condition responsive electronic circuit actuates injector valve)123/527Gaseous fuel and air mixer

Examiners

Primary: Cross, E. Rollins

Attorney, Agent or Firm

Parkhurst & Oliff

International Classes

F02D 19/00 (20060101)
F02D 41/00 (20060101)
F02D 19/02 (20060101)
F02D 41/10 (20060101)
F02D 41/08 (20060101)
F02D 41/36 (20060101)
F02D 41/32 (20060101)

Foreign Application Priority Data

1982-12-01 GB

Abstract

An air/fuel induction system includes a pair of solenoid valves injecting fuel into an induction passage of a multi-cylinder engine. The valves supply fuel upstream of the inlet manifold to the engine and do not therefore direct fuel to specific cylinders. The solenoids (36, 36a) operate alternatively through pulses developed by drive units controlled by a microprocessor-based control unit (19). Each valve is independently timed by a respective timer-counter (44, 45) and valve operation overlaps in some circumstances. This allows smaller valves to be used and overcomes the problem of gusting at low speeds. The system may be applied to an LPG fuel system used as an additional fuel supply.