Control method
First Claim
1. A control method for controlling the operation of a compression ignition internal combustion engine having an accelerometer associated therewith and arranged to sense vibrations of the engine, and monitor means arranged to monitor the output signal of the accelerometer, the method comprising the steps of monitoring the output signal during a detection time interval and a reference time interval, wherein the reference time interval occurs during a period in which no combustion variations occur, using the output signal during the reference time interval to compensate for background noise, and using the noise compensated signal in controlling the operation of the engine.
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Accused Products
Abstract
A control method as described, the method being intended for use controlling the operation of a compression ignition internal combustion engine having an accelerometer associated therewith and arranged to sense vibrations of the engine, and a monitor arranged to monitor the output signal of the accelerometer, by monitoring the output signal during a detection time interval and a reference time interval, using the output signal during the reference time interval to compensate for background noise, and using the noise compensated signal in controlling the operation of the engine.
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Citations
10 Claims
- 1. A control method for controlling the operation of a compression ignition internal combustion engine having an accelerometer associated therewith and arranged to sense vibrations of the engine, and monitor means arranged to monitor the output signal of the accelerometer, the method comprising the steps of monitoring the output signal during a detection time interval and a reference time interval, wherein the reference time interval occurs during a period in which no combustion variations occur, using the output signal during the reference time interval to compensate for background noise, and using the noise compensated signal in controlling the operation of the engine.
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7. A control method for controlling the operation of a compression ignition internal combustion engine having an accelerometer associated therewith and arranged to sense vibrations of the engines, and monitor means arranged to monitor the output signal of the accelerometer, the method comprising the steps of monitoring the output signal during a detection time interval and a reference time interval, wherein the detection time interval occurs just prior to a cylinder of the engine reaching its top-dead-center condition, filtering the output signal, wherein the filtering step is arranged to remove from the output signal components other than those indicative of combustion abnormalities, using the output signal during the reference time interval to compensate for background noise, and using the noise compensated signal in controlling the operation of the engine, further comprising the step of varying the quantity of fuel supplied during the pilot injection when a combustion abnormality is sensed in order to determine the maximum quantity of fuel which is permitted during a pilot injection.
- 8. A control method for controlling the operation of a compression ignition internal combustion engine having an accelerometer associated therewith and arranged to sense vibrations of the engine, and monitor means arranged to monitor the output signal of the accelerometer, the method comprising the steps of monitoring the output signal during a detection time interval and a reference time interval, wherein the detection time interval occurs just prior to a cylinder of the engine reaching its top-dead-center condition, filtering the output signal using the output signal during the reference time interval to compensate for background noise, and using the noise compensated signal in controlling the operation of the engine, wherein the filtering step is arranged to remove from the output signal components other than those indicative of injector needle movement.
Specification