having an enrichment mechanism modifying fuel flow to injectors, e.g. by acting on the fuel metering device or on the valves throttling fuel passages to injection nozzles or overflow passages

Child Classifications

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• F02M 69/38 using fuel pressure, e.g. by varying fuel pressure in the control chambers of the fuel metering device (the means varying fuel pressure in a fuel by-pass passage, the pressure acting on a throttle valve against the action of metered or throttled fuel pressure for variably throttling fuel flow to injection nozzles F02M69/26) since 1990 +2 CPC IPC+CPC Available in IPC and CPC
• F02M 69/40 using variably controlled air pressure, e.g. by modifying the intake air vacuum signal acting on the fuel metering device since 1990 IPC+CPC Available in IPC and CPC
• F02M 69/42 using other means than variable fluid pressure, e.g. acting on the fuel metering device mechanically or electrically since 1990 IPC+CPC Available in IPC and CPC