Engine control system and method

Patent metadata

Field	Value
Publication number	US-11499496-B2
Application number	US-201815872389-A
Country	US
Kind code	B2
Filing date	Jan 16, 2018
Priority date	Jan 16, 2018
Publication date	Nov 15, 2022
Grant date	Nov 15, 2022

Abstract

A method for controlling an engine in response to an increase in a load on the engine is disclosed. The engine includes a cylinder with a piston slidably disposed therein between a top dead center position and a bottom dead center position. The cylinder and the piston define a combustion chamber. The method includes initiating a first injection event and a second injection event. The first injection event includes introducing a first predetermined quantity of fuel into the combustion chamber at least 5 degrees before the piston reaches the top dead center position. The second injection event includes introducing a second predetermined quantity of fuel into the combustion chamber not earlier than 30 degrees after the piston moves away from the top dead center position.

First claim

What is claimed is:

1. A method for controlling a diesel compression engine in response to an increase in a load on the engine in the form of a transient load condition resulting from application of a near-instantaneous load, the diesel compression engine including a cylinder having a piston slidably disposed therein between a top dead center position and a bottom dead center position, the cylinder and the piston defining a combustion chamber, the method comprising:
responsive to detection of the increase in the load of the diesel compression engine in the form of the transient load condition resulting from application of the near-instantaneous load:
performing a first injection event within an engine compression ignition cycle, the first injection event including introducing a first predetermined quantity of fuel into the combustion chamber at least 5 degrees before the piston reaches the top dead center position; and
performing a second injection event within said engine compression ignition cycle, with combustion of the first injection event still in progress, the second injection event including introducing a second predetermined quantity of fuel into the combustion chamber not earlier than 30 degrees after the piston moves away from the top dead center position and before starting an engine compression ignition cycle immediately subsequent to said engine compression ignition cycle,

wherein the diesel compression engine includes a plurality of said cylinders, the method further comprising deactivating, for the first injection event and the second injection event for said engine compression ignition cycle, at least one of the plurality of cylinders while maintaining a remaining plurality of cylinders in an active state to introduce the first and second predetermined quantities of fuel into the combustion chambers of the maintained remaining active state cylinders for said engine compression ignition cycle, and
wherein said deactivating includes stopping supply of the fuel to said at least one of the plurality of cylinders.

2. The method of claim 1 further comprising combusting the second predetermined quantity of fuel in the combustion chamber, resulting in exhaust gas having an amount of thermal energy.

3. The method of claim 2 further comprising:
directing the exhaust gas to a turbocharger, the turbocharger having a turbine portion including a turbine inlet and a turbine outlet, and a compressor portion driven by the turbine portion and including a compressor inlet and a compressor outlet, wherein the exhaust gas is directed to the turbine inlet; and
extracting a portion of the thermal energy from the exhaust gas by the turbine portion.

4. The method of claim 3 , wherein the amount of thermal energy in the exhaust gas as a result of combusting the second predetermined quantity of fuel is greater than an amount of thermal energy that would have been available by combusting the first predetermined quantity of fuel alone, resulting in the turbine portion driving the compressor portion at a speed greater than a speed by combusting the first predetermined quantity of fuel alone, thereby resulting in greater boost pressure from the compressor outlet.

5. The method of claim 1 , wherein the second injection event occurs not later than 70 degrees after a movement of the piston from the top dead center position.

6. The method of claim 1 , wherein half of the plurality of cylinders are deactivated and half of the plurality of cylinders are active.

7. The method of claim 1 further including detecting, by a controller, the increase in the load and calibrating a specific quantity of the first predetermined quantity of fuel and a specific quantity of the second predetermined quantity of fuel based on the increase in the load.

8. The method of claim 1 , wherein a quantity of the first predetermined quantity of fuel is directly proportional to the increase in the load, while a quantity of the second predetermined quantity of fuel is determined as a fixed predetermined value.

9. A control system for controlling a diesel compression engine in response to an increase in a load on the diesel compression engine in the form of a transient load condition resulting from application of a near-instantaneous load, the diesel compression engine including a cylinder having a piston slidably disposed therein between a top dead center position and a bottom dead center position, the cylinder and the piston defining a combustion chamber, the control system comprising:
a controller configured to
control performance of, responsive to detection of the increase in the load of the diesel compression engine in the form of the transient load condition resulting from application of the near-instantaneous load, a first injection event within an engine compression ignition cycle, the first injection event including introducing a first predetermined quantity of fuel into the combustion chamber at least 5 degrees before the piston reaches the top dead center position, and
control performance of a second injection event within said engine compression ignition cycle, with combustion of the first injection event still in progress, the second injection event including introducing a second predetermined quantity of fuel into the combustion chamber not earlier than 30 degrees after the piston moves away from the top dead center position and before starting an engine compression ignition cycle immediately subsequent to said engine compression ignition cycle,

wherein the diesel compression engine includes a plurality of said cylinders, and the controller is further configured to deactivate, for the first injection event and the second injection event for said engine compression ignition cycle, at least one of the plurality of cylinders while maintaining a remaining plurality of cylinders in an active state to introduce the first and second predetermined quantities of fuel into the combustion chambers of the maintained remaining active state cylinders for said engine compression ignition cycle, and
wherein, when said at least one of the plurality of cylinders is deactivated no fuel is supplied to said at least one of the plurality of cylinders.

10. The control system of claim 1 , wherein the second predetermined quantity of fuel is combusted in the combustion chamber, resulting in exhaust gas having an amount of thermal energy.

11. The control system of claim 10 ,
wherein the diesel compression engine further includes a turbocharger, the turbocharger having a turbine portion including a turbine inlet and a turbine outlet, and a compressor portion driven by the turbine portion and including a compressor inlet and a compressor outlet, wherein the exhaust gas is directed to the turbine inlet and a portion of the thermal energy from the exhaust gas is extracted by the turbine portion, and
wherein the amount of thermal energy in the exhaust gas as a result of combusting the second predetermined quantity of fuel is greater than an amount of thermal energy that would have been available by combusting the first predetermined quantity of fuel alone, resulting in the turbine portion driving the compressor portion at a speed greater than a speed by combusting the first predetermined quantity of fuel alone, thereby resulting in greater boost pressure from the compressor outlet.

12. The control system of claim 9 , wherein the controller is configured to initiate the second injection event not later than 70 degrees after a movement of the piston from the top dead center position.

13. The control system of claim 9 , wherein the controller is configured to detect the increase in the load and calibrate a specific quan

Assignees

• Caterpillar Inc

Inventors

• Sunley Ryan T
• Pierpont David A
• Rasmussen Jason J

Classifications

• Y02T10/40

  Engine management systems · CPC title

• F02B39/08

  Non-mechanical drives, e.g. fluid drives having variable gear ratio · CPC title

• F02B2037/122

  Control of rotational speed of the pump · CPC title

• F02D41/0087

  Selective cylinder activation, i.e. partial cylinder operation (deceleration cut-off F02D41/123) · CPC title

• F02D41/402 Primary

  Multiple injections · CPC title