Method and device for controlling cylinder deactivation and oil cut-off of internal combustion engine cam overhead type closed cylinder

Abstract

The invention relates to a method and a device for controlling cylinder deactivation and oil cut-off through cam overhead type cylinder closing of an internal combustion engine. A two-way holding electromagnet is installed on a rocker arm, a movable iron core of the two-way holding electromagnet is located between a cam and the rocker arm when being in an extending state, the cam and the rocker arm have interaction, the rocker arm has acting force on a valve, and the valve works normally; when the movable iron core of the bidirectional holding electromagnet is in a retracted state, the cam and the rocker arm do not interact, the rocker arm does not generate acting force on the valve, the valve is in a closed state, the damping shaft is arranged between the rocker arm and the cam, the damping spring is installed on the damping shaft, and the damping spring solves the problems of vibration and noise after cylinder deactivation. The internal combustion engine cylinder closing control cylinder deactivation and fuel cut-off technology is achieved.

Description

Technical Field

[0001] This invention relates to a method and apparatus for cylinder deactivation control and fuel cut-off in internal combustion engines with a camshaft-mounted cylinder deactivation system, and pertains to the field of cylinder deactivation control and fuel cut-off technology for internal combustion engines. Background Technology

[0002] As early as 100 years ago, people discovered that cylinder deactivation technology in internal combustion engines—that is, stopping some cylinders from working when the internal combustion engine is running at low to medium power—can reduce fuel consumption and emissions. However, due to the high cost and poor cost-effectiveness of cylinder deactivation technology, it has only been implemented in high-end vehicles and has not been widely used. Now, with increasingly stringent environmental protection requirements, people have begun to conduct in-depth research on cylinder deactivation technology for internal combustion engines. Currently, most mainstream internal combustion engine cylinder deactivation control technologies at home and abroad are mainly based on hydraulic and solenoid valve control. However, there are also a few different technical solutions. Chrysler's MDS system uses solenoid valves to control the opening and closing of oil passages. Oil pressure pushes the internal locking pins of the tappets to change the state of the tappets and realize valve start-stop. General Motors' LSY engine uses solenoid valves to control hydraulic pressure to push the camshaft to slide axially and switch to a zero-lift cam to achieve cylinder deactivation. Mercedes-Benz's M113 V8 engine uses a control module to operate hydraulic solenoid valves. Oil pressure pushes the valve rocker arm control valve to close a designated cylinder. Volkswagen's ACT technology also uses solenoid valves to control the cam position and uses hydraulic related structures to complete the cylinder deactivation switching. FreeValve uses solenoid valves to independently control each valve, eliminating the need for hydraulic assistance. In Volvo tests, this solution reduced fuel consumption by another 27%. BMW's cylinder deactivation solution introduces exhaust gas into the deactivated cylinder to maintain thermal balance. Its valve train is controlled by a servo motor-driven eccentric shaft, departing from the conventional combination of hydraulics and solenoid valves.

[0003] All of the above technologies have drawbacks, such as requiring significant modifications to the internal combustion engine, high cost, and poor cost-effectiveness. Cummins' cylinder deactivation technology has been applied to heavy-duty vehicles, but the cost per unit is $1,700 to $2,800, which is still too high for widespread application.

[0004] All of the above technologies suffer from drawbacks such as requiring significant modifications to the internal combustion engine, high cost, and poor cost-effectiveness. Summary of the Invention

[0005] To overcome the numerous shortcomings of existing internal combustion engine cylinder deactivation control technologies, this invention proposes a method and apparatus for cylinder deactivation control and fuel cut-off in an internal combustion engine with a cam-mounted cylinder deactivation mechanism. The method involves installing a bidirectional holding electromagnet on a rocker arm, using the electromagnet as a component to control whether the rocker arm and the cam interact. A damping shaft is installed between the rocker arm and the cam, and a damping spring is installed on the damping shaft. The damping spring solves the vibration and noise problems after cylinder deactivation, thereby realizing the internal combustion engine cylinder deactivation control and fuel cut-off technology.

[0006] The specific structure is as follows:

[0007] A two-way holding electromagnet is installed on the rocker arm. When the moving iron core of the two-way holding electromagnet is in the extended state, it is between the cam and the rocker arm. The cam and the rocker arm interact, and the rocker arm exerts a force on the valve, so the valve works normally. When the moving iron core of the two-way holding electromagnet is in the retracted state, the cam and the rocker arm do not interact, the rocker arm does not exert a force on the valve, and the valve is in the closed state. A damping shaft is set between the rocker arm and the cam, and a damping spring is installed on the damping shaft. The damping spring solves the vibration and noise problems after cylinder deactivation. Attached Figure Description

[0008] The attached figure is a schematic diagram of the structure of the present invention.

[0009] In the diagram, 1 is the valve rocker arm, 2 is the camshaft, 3 is the cam, 4 is the moving iron core, 5 is the bidirectional holding electromagnet, 6 is the bidirectional holding electromagnet terminal, 7 is the damping spring shaft, and 8 is the damping spring. Detailed Implementation

[0010] In the diagram, 5 bidirectional holding electromagnets are installed on rocker arm 1. When the moving iron core 4 is in the extended state, it is between cam 3 and rocker arm 1. Cam 3 interacts with rocker arm 1, and rocker arm 1 exerts force on the valve, so the valve works normally. When the moving iron core 4 is in the retracted state, cam 3 and rocker arm 1 do not interact, rocker arm 1 does not exert force on the valve, so the valve is in the closed state. A damping shaft 7 is set between rocker arm 1 and cam 3. A damping spring is installed on the damping shaft 7. The damping spring solves the vibration and noise problems after cylinder deactivation. The terminal of the bidirectional holding electromagnet 6 is connected to the power supply.

[0011] Beneficial effects

[0012] This invention completely overcomes the shortcomings of existing internal combustion engine cylinder deactivation control technology, which requires changes to the internal combustion engine structure, resulting in complex structure, high processing difficulty, high cost, poor cost-effectiveness, and limited widespread application. This invention has a simple structure and low cost, consisting of only a bidirectional holding electromagnet installed on the rocker arm. Electromagnets are a mature product with a century of history and guaranteed reliability.

[0013] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method and device for controlling the stop of the cylinder of the internal combustion engine with the cam on top, the method comprising: installing a bidirectional holding electromagnet on the rocker arm, using the bidirectional holding electromagnet as the element for controlling the interaction between the rocker arm and the cam, and arranging a damping shaft between the rocker arm and the cam, and installing a damping spring on the damping shaft to solve the problem of vibration and noise after the stop of the cylinder. The specific structure is as follows: A bidirectional holding electromagnet is installed on the rocker arm, the moving iron core of the bidirectional holding electromagnet is in the extended state between the cam and the rocker arm, the cam and the rocker arm have interaction, the rocker arm has force on the valve, the valve works normally, the moving iron core of the bidirectional holding electromagnet is in the retracted state, the cam and the rocker arm have no interaction, the rocker arm does not have force on the valve, and the valve is in the closed state, a damping shaft is arranged between the rocker arm and the cam, a damping spring is installed on the damping shaft, and the damping spring solves the problem of vibration and noise after the stop of the cylinder.

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