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US 4,051,818 AGranted
Device for obtaining signals for the control unit of an electronic fuel injection system
AssigneeVolkswagenwerk Aktiengesellschaft
InventorJurgen Volckers
Life of this patent
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Abstract
A device modifies the signals for the control unit of an electronic fuel injection system of an internal combustion engine in order to reduce lengthwise vehicle vibrations. The signals are derived from a tachometer that measures the engine speed and a gauge that measures the air flow supply to the engine. The device dampens the a.c. components in the signal either symmetrically or asymmetrically. This device can be in the form of a passive RC circuit with diodes to determine the operating points or it can be an active circuit.
Claims10
An electronic fuel injection system of an internal combustion engine comprising:
- rotational speed measuring means for measuring the engine speed;
- air measuring means for measuring at least one of the flow of air supplied to the engine and the air intake pressure;
- analog signal means for assuring the creation of analog voltage signals from the output signals of said measuring means;
- at least one stabilizing means having a low pass transfer characteristic with a cut-off frequency in the range from about 2 to 8 Hz, said stabilizing means receiving the analog signal of at least one of said measuring means and producing a signal in which the a.c. voltage components resulting from longitudinal vehicle vibrations that occur in the analog voltage signal have been dampened;
- and
- a control unit for controlling the injection of fuel in response to at least the dampened signal from said stabilizing means.
3 more elements
Dependencies are inferred from the claim text.