Control system for internal combustion engine
First Claim
1. A control system for an internal combustion engine, comprising:
- pressure change amount-detecting means for detecting an amount of change in pressure within a cylinder of the engine as a pressure change amount;
heat release amount-calculating means for calculating an amount of heat released in the cylinder as a heat release amount, according to the detected pressure change amount;
load detecting means for detecting load on the engine; and
fuel property-estimating means for estimating a property of fuel, based on the calculated heat release amount and the detected load on the engine.
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Accused Products
Abstract
A control system for an internal combustion engine, which is capable of estimating a property of fuel accurately even when the engine is in an operating condition other than idling. An in-cylinder pressure sensor detects an amount of change in pressure in a cylinder #1 of the engine as a pressure change amount. An ECU calculates an amount of heat released in the cylinder #1 as a heat release amount, according to the pressure change amount. A vehicle speed sensor, a crank angle sensor, and an accelerator pedal opening sensor detect load on the engine. The ECU estimates a cetane number of fuel based on the calculated heat release amount and the detected load on the engine.
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Citations
8 Claims
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1. A control system for an internal combustion engine, comprising:
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pressure change amount-detecting means for detecting an amount of change in pressure within a cylinder of the engine as a pressure change amount; heat release amount-calculating means for calculating an amount of heat released in the cylinder as a heat release amount, according to the detected pressure change amount; load detecting means for detecting load on the engine; and fuel property-estimating means for estimating a property of fuel, based on the calculated heat release amount and the detected load on the engine. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A control system for an internal combustion engine, comprising:
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pressure change amount-detecting means for detecting an amount of change in pressure within a cylinder of the engine as a pressure change amount; heat release amount-calculating means for calculating an amount of heat released in the cylinder as a heat release amount, according to the detected pressure change amount; load detecting means for detecting load on the engine; and cetane number-estimating means for estimating a cetane number of fuel, based on the calculated heat release amount and the detected load on the engine.
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8. A control system for an internal combustion engine that sequentially performs a pilot injection and a main injection to thereby inject fuel into a cylinder, comprising:
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pressure change amount-detecting means for detecting an amount of change in pressure within a cylinder of the engine caused by combustion of fuel injected by the pilot injection, as a pressure change amount; heat release amount-calculating means for calculating an amount of heat released in the cylinder as a heat release amount, according to the detected pressure change amount; load detecting means for detecting load on the engine; and fuel property-estimating means for estimating a property of fuel, based on the calculated heat release amount and the detected load on the engine.
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Specification