Intake temperature control systems and methods for intake manifold protection
View Patent ↗An engine control system of a vehicle includes a first temperature module, a second temperature module, and an exhaust gas recirculation (EGR) control module. The first temperature module determines a temperature of gas within an intake manifold of an engine. The second temperature module determines a temperature of an EGR conduit that is coupled to the intake manifold. The EGR control module reduces opening of an EGR valve when the temperature of the gas and the temperature of the conduit is greater than a predetermined temperature.
1. An engine control system of a vehicle, comprising:
a first temperature module that determines a temperature of gas within an intake manifold of an engine;
a second temperature module that determines a temperature of an exhaust gas recirculation (EGR) conduit that is coupled to the intake manifold based on a sum of the temperature of the gas within the intake manifold and a predetermined temperature offset; and
an EGR control module that reduces opening of an EGR valve when the temperature of the gas and the temperature of the conduit is greater than a predetermined temperature.
2. The engine control system of claim 1 wherein the predetermined temperature corresponds to a melting temperature of the intake manifold.
3. The engine control system of claim 1 wherein the EGR control module reduces the opening of the EGR valve to a predetermined opening when the temperature of the gas and the temperature of the conduit is greater than the predetermined temperature.
4. The engine control system of claim 1 wherein the EGR control module fully closes the EGR valve when the temperature of the gas and the temperature of the conduit is greater than the predetermined temperature.
5. The engine control system of claim 1 wherein the EGR control module reduces the opening of the EGR valve when the temperature of the gas and the temperature of the conduit is greater than the predetermined temperature for a predetermined period.
6. The engine control system of claim 1 wherein the EGR control module reduces the opening of the EGR valve until the temperature of the gas and the temperature of the conduit is less than a second predetermined temperature that is less than the predetermined temperature.
7. The engine control system of claim 6 wherein the EGR control module reduces the opening of the EGR valve until the temperature of the gas and the temperature of the conduit is less than the second predetermined temperature for a predetermined period.
8. The engine control system of claim 1 further comprising a coolant control module that at least one of turns on an electric coolant pump and increases a speed of the electric coolant pump when at least one of the temperature of the gas and the temperature of the conduit is greater than a third predetermined temperature that is less than the predetermined temperature.
9. The engine control system of claim 1 further comprising a coolant control module that opens an electric thermostat valve when at least one of the temperature of the gas and the temperature of the conduit is greater than a third predetermined temperature that is less than the predetermined temperature.
10. The engine control system of claim 1 further comprising a shutter control module that opens aerodynamic shutters of the vehicle when at least one of the temperature of the gas and the temperature of the conduit is greater than a third predetermined temperature that is less than the predetermined temperature.
11. An engine control method for a vehicle, comprising:
determining a temperature of gas within an intake manifold of an engine;
determining a temperature of an exhaust gas recirculation (EGR) conduit that is coupled to the intake manifold based on a sum of the temperature of the gas within the intake manifold and a predetermined temperature offset; and
reducing opening of an EGR valve when the temperature of the gas and the temperature of the conduit is greater than a predetermined temperature.
12. The engine control method of claim 11 wherein the predetermined temperature corresponds to a melting temperature of the intake manifold.
13. The engine control method of claim 11 further comprising reducing the opening of the EGR valve to a predetermined opening when the temperature of the gas and the temperature of the conduit is greater than the predetermined temperature.
14. The engine control method of claim 11 further comprising fully closing the EGR valve when the temperature of the gas and the temperature of the conduit is greater than the predetermined temperature.
15. The engine control method of claim 11 further comprising reducing the opening of the EGR valve when the temperature of the gas and the temperature of the conduit is greater than the predetermined temperature for a predetermined period.
16. The engine control method of claim 11 further comprising reducing the opening of the EGR valve until the temperature of the gas and the temperature of the conduit is less than a second predetermined temperature that is less than the predetermined temperature.
17. The engine control method of claim 16 further comprising reducing the opening of the EGR valve until the temperature of the gas and the temperature of the conduit is less than the second predetermined temperature for a predetermined period.
18. The engine control method of claim 11 further comprising, when at least one of the temperature of the gas and the temperature of the conduit is greater than a third predetermined temperature that is less than the predetermined temperature, at least one of:
turning on an electric coolant pump; and
increasing a speed of the electric coolant pump.
19. The engine control method of claim 11 further comprising opening an electric thermostat valve when at least one of the temperature of the gas and the temperature of the conduit is greater than a third predetermined temperature that is less than the predetermined temperature.
20. The engine control method of claim 11 further comprising opening aerodynamic shutters of the vehicle when at least one of the temperature of the gas and the temperature of the conduit is greater than a third predetermined temperature that is less than the predetermined temperature.
21. An engine control system of a vehicle, comprising:
a first temperature module that determines a temperature of gas within an intake manifold of an engine;
a second temperature module that determines a temperature of an exhaust gas recirculation (EGR) conduit that is coupled to the intake manifold;
an EGR control module that reduces opening of an EGR valve when the temperature of the gas and the temperature of the conduit is greater than a first predetermined temperature, wherein the first predetermined temperature is based on a melting temperature of the intake manifold; and
a coolant control module that, when the temperature of the gas and the temperature of the conduit is greater than a second predetermined temperature, at least one of (i) turns on an electric coolant pump and (ii) increases a speed of the electric coolant pump,
wherein the second predetermined temperature is less than the first predetermined temperature.