Combustion-pressure-data acquisition system of multi-cylinder engine
First Claim
1. A combustion-pressure-data acquisition system of a multi-cylinder engine, comprising:
- an in-cylinder pressure sensor, provided for each cylinder, for outputting an electric-charge signal according to pressure in the cylinder;
an amplifier circuit, provided for each cylinder, being connected to the in-cylinder pressure sensor, converting the electric-charge signal from the in-cylinder pressure sensor into a voltage signal and outputting the voltage signal, having a reset function for discharging an electric charge with an externally input reset signal; and
a switching circuit for selecting a system to be measured from among output signals of the amplifier circuits for the cylinders with a signal based on an engine cylinder determination result to output combustion pressure data and for outputting the reset signal to an amplifier circuit of a system with which measurement ends.
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Abstract
A combustion-pressure-data acquisition system of a multi-cylinder engine according to the present invention includes an in-cylinder pressure sensor CPS#n for directly detecting combustion pressure in each cylinder; an amplifier unit AP#n to which the in-cylinder pressure sensor CPS#n for each cylinder is connected; and a channel switching unit MUX to which the amplifier unit AP#n for each cylinder is connected. It selects a system to be measured from among a plurality of systems of signals from the amplifier units AP#n with a channel selection signal outputted from an engine-controlling electronic control unit and outputs combustion pressure data to the ECU. Further, it outputs to an amplifier unit AP#n with which measurement ends a reset signal for discharging the electric charge between the in-cylinder pressure sensor CPS#n and the amplifier circuit to efficiently acquire combustion pressure data of each cylinder with a simple structure without complicated processing.
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Citations
2 Claims
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1. A combustion-pressure-data acquisition system of a multi-cylinder engine, comprising:
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an in-cylinder pressure sensor, provided for each cylinder, for outputting an electric-charge signal according to pressure in the cylinder; an amplifier circuit, provided for each cylinder, being connected to the in-cylinder pressure sensor, converting the electric-charge signal from the in-cylinder pressure sensor into a voltage signal and outputting the voltage signal, having a reset function for discharging an electric charge with an externally input reset signal; and a switching circuit for selecting a system to be measured from among output signals of the amplifier circuits for the cylinders with a signal based on an engine cylinder determination result to output combustion pressure data and for outputting the reset signal to an amplifier circuit of a system with which measurement ends. - View Dependent Claims (2)
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Specification