Stroboscopic engine fuel-injection timing

(19)

(11)

EP 0 097 211 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	30.10.1985 Bulletin 1985/44

(43)	Date of publication A2:
	04.01.1984 Bulletin 1984/01

(21)	Application number: 82306191

(22)	Date of filing: 22.11.1982

(84)	Designated Contracting States:
	AT DE FR IT NL SE

(30)

Priority:

21.06.1982 GB 8217928

(71)	Applicant: FROUDE CONSINE LIMITED
	()

(72)	Inventor:
	Hitchcock, Keith Norman ()

(54)	Stroboscopic engine fuel-injection timing

(57) Fuel injection is detected by listening for pulses of sound at or near 40 KHz from the region of the fuel injection and used to produce a first series of pulses representing the instants of fuel injection. A second series of pulses is derived from the first series and used to control a strobe lamp flashing on a rotating timing marker of the engine. The timing of the second series of pulses is adjusted until the strobe lamp flashes at the instants that the timing marker passes a stationary reference marker. The timing relationship between the first and second series of pulses then indicates the timing of the fuel injection.

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