System for estimating peak cylinder pressure in an internal combustion engine
AssigneeCummins Inc.
InventorJohn F. Wright
Life of this patent
Estimating the term…
Abstract
A system for estimating peak cylinder pressure in an internal combustion engine includes a pressure sensor producing a pressure signal indicative of pressure within an intake manifold of the engine, a temperature sensor producing a temperature signal indicative of temperature within the intake manifold, means for determining a charge fuel ratio corresponding to a ratio of in-cylinder trapped charge mass and in-cylinder trapped fuel mass, and a control computer determining a start-of-injection value corresponding to a start of fuel injection into the engine. The control computer is operable to estimate peak cylinder pressure as a function of the pressure signal, the temperature signal, the charge fuel ratio and the start-of-injection value.
Claims14
System for estimating peak cylinder pressure in an internal combustion engine, comprising:
- a pressure sensor producing a pressure signal indicative of pressure within an intake manifold of the engine;
- a temperature sensor producing a temperature signal indicative of temperature within said intake manifold;
- means for determining a charge fuel ratio corresponding to a ratio of in-cylinder trapped charge mass and in-cylinder trapped fuel mass;
- and
- a control computer determining a start-of-injection value corresponding to a timing of start of fuel injection into the engine, said control computer estimating peak cylinder pressure as a function of said pressure signal, said temperature signal, said charge fuel ratio and said start-of-injection value.
A method of estimating peak cylinder pressure in an internal combustion engine, the method comprising the steps of:
- determining a pressure value indicative of pressure within an intake manifold of the engine;
- determining a temperature value indicative of temperature within said intake manifold;
- determining a charge fuel ratio corresponding to a ratio of in-cylinder trapped charge mass and in-cylinder trapped fuel mass;
- determining a start-of-injection value corresponding to a timing of start of fuel injection into the engine;
- and
- estimating peak cylinder pressure as a function of said pressure value, said temperature value, said charge fuel ratio and said start-of-injection value.
Dependencies are inferred from the claim text.