| 摘要 |
An electronic throttle body fuel injection system in which a fuel pump delivers fuel at constant flow and pressure to a jet in a pressure controlled chamber which is continuously ported upstream of the jet discharge to a fuel nozzle in a throttle bore and is periodically ported to bypass back to the pump fuel supply by an electrically operated on-off valve. The valve has an atmospheric reference pressure bias and is operable with a fuel demand signal from a conventional electronic fuel injection control system to open and close for time periods which vary with the fuel signal to vary the pressure in the controlled chamber between a value which induces fuel flow through the fuel nozzle for such time periods and a value which does not to thereby effect a metered flow to the fuel nozzle according to the fuel demand signal to provide the desired air/fuel ratio for optimum engine running conditions.
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