Cylinder deactivation control method and apparatus of engine, and engine

Patent metadata

Field	Value
Publication number	US-12292011-B2
Application number	US-202418748392-A
Country	US
Kind code	B2
Filing date	Jun 20, 2024
Priority date	Apr 20, 2023
Publication date	May 6, 2025
Grant date	May 6, 2025

Abstract

In a cylinder deactivation control method of an engine, a cylinder deactivation trigger moment of a to-be-controlled engine is determined; a second cycle and a cylinder deactivation mode corresponding to the next first cycle are determined according to the crankshaft rotation speed at the cylinder deactivation trigger moment, the target torque at the cylinder deactivation trigger moment, and a second cycle and a cylinder deactivation mode corresponding to the previous first cycle at the cylinder deactivation trigger moment; the fuel injection quantity of the ignition cylinder in the next first cycle is determined.

First claim

What is claimed is:

1. A cylinder deactivation control method of an engine, comprising:
acquiring a current crankshaft rotation angle of a to-be-controlled engine and a current crankshaft rotation speed of the to-be-controlled engine;
determining, based on the current crankshaft rotation angle, whether the to-be-controlled engine is at a cylinder deactivation trigger moment;
in response to a determination that the to-be-controlled engine is at the cylinder deactivation trigger moment, determining a working condition region of a next first cycle based on the current crankshaft rotation speed and a target torque of the next first cycle;
determining whether the working condition region of the next first cycle is identical to a working condition region corresponding to a second cycle in which a previous first cycle is located;
in response to a determination that the working condition region of the next first cycle is identical to the working condition region corresponding to the second cycle in which the previous first cycle is located, determining a fuel injection quantity of an ignition cylinder in the next first cycle based on a second cycle matrix in which the next first cycle is located and the target torque of the next first cycle; and
in response to a determination that the working condition region of the next first cycle is different from the working condition region corresponding to the second cycle in which the previous first cycle is located, determining a position of the next first cycle in a second cycle corresponding to the next first cycle based on a relationship between a number of working cylinders in a working condition region in which the previous first cycle is located and a number of working cylinders in the working condition region in which the next first cycle is located, and determining a fuel injection quantity of an ignition cylinder in the next first cycle based on a determined position of the next first cycle in the second cycle corresponding to the next first cycle;
wherein determining the position of the next first cycle in the second cycle corresponding to the next first cycle based on the relationship between the number of working cylinders in the working condition region in which the previous first cycle is located and the number of working cylinders in the working condition region in which the next first cycle is located, and determining the fuel injection quantity of the ignition cylinder in the next first cycle based on the determined position of the next first cycle in the second cycle corresponding to the next first cycle comprises:
determining whether a number of working cylinders in a working condition region corresponding to a second cycle matrix in which the previous first cycle is located is less than the number of working cylinders in the working condition region of the next first cycle;
in response to a determination that the number of working cylinders in the working condition region corresponding to the second cycle matrix in which the previous first cycle is located is less than the number of working cylinders in the working condition region of the next first cycle, determining a position of the next first cycle in the second cycle matrix corresponding to the next first cycle based on whether the previous first cycle is a first exiting cycle of the second cycle matrix in which the previous first cycle is located;
in response to a determination that the number of working cylinders in the working condition region corresponding to the second cycle matrix in which the previous first cycle is located is greater than the number of working cylinders in the working condition region of the next first cycle, determining a position of the next first cycle in the second cycle matrix corresponding to the next first cycle based on whether the previous first cycle is a second exiting cycle of the second cycle matrix in which the previous first cycle is located; and
determining the fuel injection quantity of the ignition cylinder in the next first cycle based on the position of the next first cycle in the second cycle matrix corresponding to the next first cycle.

2. The cylinder deactivation control method of an engine of claim 1 , after determining the fuel injection quantity of the ignition cylinder in the next first cycle, the cylinder deactivation control method of the engine further comprises: controlling, based on a cylinder deactivation mode of the next first cycle and the fuel injection quantity, the to-be-controlled engine to work.

3. The cylinder deactivation control method of an engine of claim 1 , wherein the first cycle is a working period during which a crankshaft of the to-be-controlled engine completes a 720-degree rotation, the second cycle is a working period of the to-be-controlled engine and is formed by a preset number of first cycles, where a number of cylinders that ignite normally is equal in each first cycle and a number of ignition times of each cylinder is equal; the second cycle matrix represents an ignition state of each cylinder in the second cycle, and one second cycle matrix corresponds to and characterizes one second cycle.

4. The cylinder deactivation control method of an engine of claim 1 , wherein determining the position of the next first cycle in the second cycle matrix corresponding to the next first cycle based on whether the previous first cycle is the first exiting cycle of the second cycle matrix in which the previous first cycle is located comprises:
determining whether the previous first cycle is the first exiting cycle of the second cycle matrix in which the previous first cycle is located;
in response to a determination that the previous first cycle is the first exiting cycle of the second cycle matrix in which the previous first cycle is located, making the next first cycle as a first entering cycle of the second cycle matrix in which the next first cycle is located; and
in response to a determination that the previous first cycle is not the first exiting cycle of the second cycle matrix in which the previous first cycle is located, making the second cycle matrix in which the next first cycle is located identical to the second cycle matrix in which the previous first cycle is located, and making a cylinder deactivation mode of the next first cycle as a next row of a row in which the previous first cycle is located in the second cycle matrix.

5. The cylinder deactivation control method of an engine of claim 4 , wherein the first exiting cycle refers to a first cycle after a second cycle with a number of ignition cylinders being k-1 is exited, in a case where the to-be-controlled engine is entered to a second cycle with a number of ignition cylinders being k from the second cycle with the number of ignition cylinders being k-1; and
the first entering cycle refers to a first cycle from which a second cycle with the number of ignition cylinders being k is entered, in a case where the to-be-controlled engine is entered to the second cycle with the number of ignition cylinders being k from the second cycle with the number of ignition cylinders being k-1.

6. The cylinder deactivation control method of an engine of claim 1 , wherein determining the position of the next first cycle in the second cycle matrix corresponding to the next first cycle based on whether the previous first cycle is the second exiting cycle of the second cycle matrix in which the previous first cycle is located comprises:
determining whether the previous first cycle is the second exiting cycle of the second cycle matrix in which the previous first cycle is located;
in response to a determination that the previous first cycle is the second exiting cycle of the second cycle matrix in which the previous first cycle is located, making the next first cycle as a

Assignees

• Weichai Power Co Ltd

Inventors

• Ren Haifeng
• Wang Fei
• Pang Bin
• Ma qingzhen
• Wang Huihui
• Chen Lin
• Mo Wenchao
• Xu Xianfa

Classifications

• F02D2200/101

  Engine speed · CPC title

• F02D2200/0614

  Actual fuel mass or fuel injection amount · CPC title

• F02D41/009

  using means for generating position or synchronisation signals · CPC title

• F02D17/02 Primary

  Cutting-out (cutting-out engines in multiple engine arrangements F02D25/04) · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title