Engine control strategy for a hybrid HCCI engine
First Claim
1. A method of operating a hybrid homogenous-charge compression-ignition (HCCI) engine and spark ignition (SI) engine, the engine having at least two cylinder groups, each of said cylinder groups comprising at least one cylinder, the method comprising the steps of:
- detecting a transition request to transition the engine from a current operating mode to a desired operating mode and, in response;
transitioning the first cylinder group from the current engine operating mode to the desired engine operating mode during a first time period; and
transitioning the second cylinder group from the current engine operating mode to the desired engine operating mode during a second time period, wherein the second time period is later than the first time period.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of operating a hybrid homogenous-charge compression-ignition (HCCI) engine and spark ignition (SI) engine. The engine includes at least two cylinder groups, and each of the cylinder groups further include at least one cylinder. The method comprises the steps of detecting a transition request to transition the engine from a current operating mode to a desired operating mode. For example, a transition request from HCCI combustion mode to SI combustion mode, or vice versa. In response, the method transitions the first cylinder group from the current engine operating mode to the desired engine operating mode during a first time period, and transitions the second cylinder group from the current engine operating mode to the desired engine operating mode during a second time period. The second time period begins after the start of the first time period. In one aspect of the invention, the second time period begins after the end of the first time period, and in another aspect of the invention, the second time period overlaps the first time period.
-
Citations
20 Claims
-
1. A method of operating a hybrid homogenous-charge compression-ignition (HCCI) engine and spark ignition (SI) engine, the engine having at least two cylinder groups, each of said cylinder groups comprising at least one cylinder, the method comprising the steps of:
-
detecting a transition request to transition the engine from a current operating mode to a desired operating mode and, in response;
transitioning the first cylinder group from the current engine operating mode to the desired engine operating mode during a first time period; and
transitioning the second cylinder group from the current engine operating mode to the desired engine operating mode during a second time period, wherein the second time period is later than the first time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
modifying the engine intake air temperature;
modifying the engine intake air pressure; and
modifying the timing of an intake and an exhaust valve of each cylinder associated with said group of cylinders.
-
-
8. The method of claim 7 wherein the steps of transitioning further include the step of modifying an exhaust gas recirculation (EGR) rate of said engine.
-
9. The method of claim 7 wherein the step of modifying the timing of said intake and exhaust valves includes the steps of operating the intake valve by a first variable camshaft and operating the exhaust valve by a second variable camshaft.
-
10. The method of claim 7 wherein the step of modifying the timing of said intake and exhaust valves includes the steps of operating the intake valve by a first electronic valve actuator and operating the exhaust valve by a second electronic valve actuator.
-
11. A hybrid homogenous-charge compression-ignition (HCCI) engine and spark ignition (SI) engine system comprising:
-
an engine comprising at least two cylinder groups, each of said cylinder groups comprising at least one cylinder; and
a controller in operative communication with said engine, said controller programmed to perform the following steps;
determine an engine load condition; and
determine a desired engine operating mode from between an HCCI operating mode and SI operating mode as a function of said engine load condition and, if said desired engine operating mode is different that a current engine operating mode, transition the first cylinder group from the current engine operating mode to the desired engine operating mode during a first time period, and transition the second cylinder group from the current engine operating mode to the desired engine operating mode during a second time period, wherein the second time period is later than the first time period. - View Dependent Claims (12, 13, 14, 15, 16)
-
-
17. In a vehicle having a hybrid homogenous-charge compression-ignition (HCCI) engine and spark ignition (SI) engine, the engine having at least two cylinder groups, each of said cylinder groups comprising at least one cylinder, a method of transitioning between HCCI combustion mode and SI combustion mode, the method comprising the steps of:
-
detecting a transition request to transition the engine from a current operating mode selected from HCCI combustion mode and SI combustion mode to the other operating mode and, in response;
transitioning the first cylinder group from the current engine operating mode to the other engine operating mode during a first time period; and
transitioning the second cylinder group from the current engine operating mode to the other engine operating mode during a second time period, wherein the second time period begins after the start of the first time period. - View Dependent Claims (18, 19, 20)
-
Specification