초록 ▼

An electronic engine controller for a diesel engine controls the mass of fuel injected by fuel injectors within the engine by receiving a Manifold Absolute Pressure (MAP) signal, from a MAP sensor positioned in an intake manifold of the engine, and generating a value indicative of the mass of fuel t

An electronic engine controller for a diesel engine controls the mass of fuel injected by fuel injectors within the engine by receiving a Manifold Absolute Pressure (MAP) signal, from a MAP sensor positioned in an intake manifold of the engine, and generating a value indicative of the mass of fuel to be injected by the fuel injectors as a function of the MAP signal. The engine controller also generates an estimate of the absolute air pressure existing in the intake manifold by retrieving a value from a table containing a plurality of values indicative of an absolute air pressure for a given engine speed and fuel injection quantity. If the MAP sensor fails then the engine controller utilizes the estimate to generate the value indicative of the mass of fuel to be injected by the fuel injectors.

대표청구항 ▼

Apparatus for controlling emissions produced by a diesel engine comprising: a microprocessor programmed to receive, from a manifold absolute pressure sensor, a manifold absolute pressure signal which is indicative of an average absolute air pressure within an intake manifold of said engine; generate

Apparatus for controlling emissions produced by a diesel engine comprising: a microprocessor programmed to receive, from a manifold absolute pressure sensor, a manifold absolute pressure signal which is indicative of an average absolute air pressure within an intake manifold of said engine; generate a manifold absolute pressure value as a function of said manifold absolute pressure signal; receive an engine speed signal which is indicative of the rotational speed of said engine; determine, as a function of said manifold absolute pressure value, a fuel injection value indicative of an amount of fuel to be injected by one or more fuel injectors within said engine; detect, in response to a signal transmitted by said manifold absolute pressure sensor, a failure in said manifold absolute pressure sensor; generate an inferred manifold absolute pressure value as a function of said fuel injection value and said engine speed value; and respond to said failure by determining a subsequent fuel injection value as a function of said inferred manifold absolute pressure value; and fuel injection means for injecting an amount of fuel which corresponds to said fuel injection value,