Method and apparatus for indicating air filter maintenance is required

A system for indicating required maintenance of an air filter used with an internal combustion engine, such system comprising:

• a manifold absolute pressure sensor;
• and
• a processor, responsive to a first reading of such manifold absolute pressure sensor taken at a first time and at a second reading of the manifold absolute pressure sensor taken at a second time, for determining, as a function of a difference between such first and second readings whether the air filter is in need of maintenance.

A method for indicating required maintenance of an air filter used with an internal combustion engine, such engine including a throttle plate for adjusting an amount of air flow passing into cylinders of the engine, such method comprising:

• determining, as a function of a throttle plate position signal produced by a throttle plate position sensor, whether the air filter is in need of maintenance.

A method for indicating required maintenance of an air filter used with an internal combustion engine, comprising:

• obtaining a first reading of a manifold absolute pressure sensor at a first time and at a second reading of the manifold absolute pressure sensor taken at a second time;
• and
• determining, as a function of a difference between such first and second readings whether the air filter is in need of maintenance.

An article of manufacture comprising:

• a computer storage medium having a computer program encoded therein code for determining, as a function of a throttle plate position signal produced by a throttle plate position sensor, whether the air filter is in need of maintenance.

An article of manufacture comprising:

• a computer storage medium having a computer program encoded therein code for determining, as a function an obtaining first reading of a manifold absolute pressure sensor at a first time and at a second reading of the manifold absolute pressure sensor taken at a second time and a function of a difference between such first and second readings whether the air filter is in need of maintenance.