Systems and methods for measuring engine boost pressure
View Patent ↗An engine system includes a correction factor generation module and a boost pressure correction module. The correction factor generation module generates a correction factor based on a first pressure difference, wherein the first pressure difference corresponds to a difference between an intake manifold absolute pressure (MAP) when an engine is on and a barometric pressure. The boost pressure correction module generates a corrected boost pressure based on the MAP when the engine is on, a second pressure difference, and the correction factor, wherein the second pressure difference corresponds to a difference between the MAP when the engine is off and the barometric pressure.
1. An engine system, comprising:
a correction factor generation module that generates a correction factor based on a first pressure difference, wherein the first pressure difference corresponds to a difference between an intake manifold absolute pressure (MAP) when an engine is on and a barometric pressure;
a boost pressure correction module that generates a corrected boost pressure based on the MAP when the engine is on, a second pressure difference, and the correction factor, wherein the second pressure difference corresponds to a difference between the MAP when the engine is off and the barometric pressure; and
a combustion control module that controls at least one of a plurality of fuel injectors and a plurality of spark plugs based on the corrected boost pressure.
2. The engine system of claim 1 , wherein the corrected boost pressure is generated by adding the MAP when the engine is on to a product of the second pressure difference and the correction factor.
3. The engine system of claim 1 , wherein the correction factor is greater than or equal to zero and less than or equal to one.
4. The engine system of claim 1 , wherein the correction factor decreases when the first pressure difference increases, and wherein the correction factor increases when the first pressure difference decreases.
5. The engine system of claim 1 , further comprising:
a MAP sensor that generates the MAP based on a pressure inside an intake manifold of the engine.
6. The engine system of claim 1 , further comprising:
a barometric pressure sensor that generates the barometric pressure based on atmospheric pressure.
7. The engine system of claim 1 , further comprising:
an air compressor that compresses air into an intake manifold at a pressure higher than atmospheric pressure.
8. The engine system of claim 7 , wherein the air compressor includes one of a turbocharger and a supercharger.
9. The engine system of claim 1 , further comprising:
a key sensor that determines whether a key is inserted into an ignition controller; and
an ignition sensor that determines whether the key is turned and the engine is started,
wherein the first pressure difference corresponds to a time period after the key is inserted into the ignition controller and before the engine is started, and wherein the second pressure difference corresponds to a time period after the engine is started.
10. A method, comprising:
generating a correction factor based on a first pressure difference, wherein the first pressure difference corresponds to a difference between an intake manifold absolute pressure (MAP) when an engine is on and a barometric pressure;
generating a corrected boost pressure based on the MAP when the engine is on, a second pressure difference, and the correction factor, wherein the second pressure difference corresponds to a difference between the MAP when the engine is off and the barometric pressure; and
controlling at least one of a plurality of fuel injectors and a plurality of spark plugs based on the corrected boost pressure.
11. The method of claim 10 , wherein the corrected boost pressure is generated by adding the MAP when the engine is on to a product of the second pressure difference and the correction factor.
12. The method of claim 10 , wherein the correction factor is greater than or equal to zero and less than or equal to one.
13. The method of claim 10 , wherein the correction factor decreases when the first pressure difference increases, and wherein the correction factor increases when the first pressure difference decreases.
14. The method of claim 10 , further comprising:
generating the MAP based on a pressure inside an intake manifold of the engine.
15. The method of claim 10 , further comprising:
generating the barometric pressure based on atmospheric pressure.
16. The method of claim 10 , further comprising:
compressing air into an intake manifold at a pressure higher than atmospheric pressure.
17. The method of claim 16 , wherein one of a turbocharger and a supercharger compresses the air into the intake manifold at the pressure higher than atmospheric pressure.
18. The method of claim 10 , further comprising:
determining whether a key is inserted into an ignition controller; and
determining whether the key is turned and the engine is started,
wherein the first pressure difference corresponds to a time period after the key is inserted into the ignition controller and before the engine is started, and wherein the second pressure difference corresponds to a time period after the engine is started.