Engine brake control device, system and method

Abstract

The application relates to an engine brake control device, system and method, belonging to the field of engine valve train oil circuit design, which mainly controls the engine oil in a rocker shaft through a brake electromagnetic valve to realize brake control, and is different from the prior art in that the rocker shaft in the application adopts a single oil circuit design, the single oil circuit is used for lubrication and braking at the same time, and the functions of braking and lubrication can be realized at the same time by controlling the opening and closing of the brake electromagnetic valve. Compared with the prior art, the single oil circuit design of the application greatly reduces the machining difficulty of the rocker shaft, in addition, the application can also carry out pressure relief through the brake electromagnetic valve, so that the requirement for an engine oil pump can be reduced, not only solving the problem of high machining difficulty in the existing engine auxiliary brake system, but also solving the problem of difficult lubrication system design in the existing engine auxiliary brake system.

Description

Technical Field

[0001] This invention relates to the field of engine valve train oil circuit design technology, and in particular to an engine braking control device, system and method. Background Technology

[0002] Current engine-assisted braking systems typically use solenoid valves to control the oil flow, which drives the brake piston of the brake rocker arm. This, combined with the engine brake cam profile, completes engine-assisted braking. The brake fluid passages and lubrication passages in the engine are independent. The rocker arm shaft, however, requires two oil passages: one for brake fluid, controlled by a solenoid valve to open and close the brake fluid flow to control braking action; and the other for lubrication, which needs to be constantly open to lubricate the engine.

[0003] Clearly, the existing technologies described above have the following two drawbacks: Firstly, the independent design of the engine's brake oil passages and lubrication oil passages results in the rocker arm shaft requiring dual oil passages. Combined with the long oil passage design of the rocker arm shaft, this makes the existing rocker arm shaft manufacturing process demanding high precision, difficult, and costly. Secondly, because the lubrication oil passages need to be constantly open, the lubrication oil pressure in the valve train must consider both high and low engine operating speeds, employing a design with excess lubrication pressure. This places high demands on the engine oil pump's capacity, hindering the development of low-pressure lubrication systems for engines.

[0004] Therefore, there is a need for a solution to the problems of high machining difficulty and lubrication system design in existing engine auxiliary braking systems. Summary of the Invention

[0005] In view of this, it is necessary to provide an engine braking control device, system and method to solve the problems of high machining difficulty and difficult lubrication system design in existing engine auxiliary braking systems.

[0006] To address the above problems, the present invention provides an engine braking control device, comprising:

[0007] A rocker arm shaft, which is connected to a braking rocker arm via a drive mechanism, and a single oil passage is provided inside the rocker arm shaft;

[0008] A brake solenoid valve, the oil outlet of which is connected to the oil inlet of the single oil circuit, is used to control the oil in the single oil circuit to lubricate the engine and drive the brake rocker arm to brake.

[0009] In one possible implementation, the braking solenoid valve includes:

[0010] The valve body has an oil inlet, an oil outlet, and a drain port. The oil inlet is connected to both the oil outlet and the drain port, and the oil outlet is connected to the single oil circuit.

[0011] A steel ball, which is movably disposed within the valve body;

[0012] A push rod is movably disposed within the valve body, one end of which abuts against the steel ball. The push rod is used to press the steel ball between the oil inlet and the drain port of the valve body based on a preset lubrication pressure, so as to disconnect the connection between the oil inlet and the drain port of the valve body when the oil pressure at the oil inlet of the valve body is less than the preset lubrication pressure.

[0013] In one possible implementation, the braking solenoid valve further includes:

[0014] The solenoid valve moving iron is slidably disposed in the valve body, and the movable end of the solenoid valve moving iron abuts against the other end of the push rod;

[0015] A first slider is slidably disposed within the valve body. The first slider has a first oil drain channel, one end of which is connected to the oil drain port of the valve body. The steel ball is movably abutting against one end of the first oil drain channel.

[0016] The second slider is slidably disposed in the valve body. The second slider, the valve body, and the first slider form an independent oil chamber. The second slider has a second oil drain channel. The independent oil chamber is connected to the other end of the first oil drain channel and one end of the second oil drain channel. The other end of the second oil drain channel is connected to the oil inlet of the valve body and the oil outlet of the valve body. The second slider is used to slide to change the opening degree of the oil inlet of the valve body and the opening degree of the oil outlet of the valve body.

[0017] A pressure regulating spring is disposed in the independent oil chamber. The two ends of the pressure regulating spring abut against the first slider and the second slider, respectively. The sliding trajectory of the solenoid valve moving iron, the sliding trajectory of the push rod, the sliding trajectory of the steel ball, the sliding trajectory of the first slider, the axis of the first oil drain channel, the axis of the pressure regulating spring, the sliding trajectory of the second slider, and the axis of the second oil drain channel are all located on the same straight line.

[0018] One possible implementation also includes:

[0019] A single-channel connector, wherein one channel of the single-channel connector is connected to the oil outlet of the brake solenoid valve, and the other channel of the single-channel connector is connected to the oil inlet of the single oil circuit.

[0020] The present invention also provides an engine braking control system, comprising:

[0021] A rocker arm shaft, which is connected to a braking rocker arm via a drive mechanism, and a single oil passage is provided inside the rocker arm shaft;

[0022] A brake solenoid valve, wherein the oil outlet of the brake solenoid valve is connected to the oil inlet of the single oil circuit, and the brake solenoid valve is used to control the oil in the single oil circuit to lubricate the engine and drive the brake rocker arm to brake.

[0023] The control module is electrically connected to the brake solenoid valve, and the control module is used for:

[0024] Obtain the engine operating mode;

[0025] If the engine is in positive power mode, the brake solenoid valve is set based on the preset lubrication pressure so that the oil in the single oil circuit lubricates the engine.

[0026] If the engine is in braking mode, the brake solenoid valve is opened based on the preset braking pressure, so that the oil in the single oil circuit drives the brake rocker arm to brake.

[0027] In one possible implementation, the braking solenoid valve includes:

[0028] The valve body has an oil inlet, an oil outlet, and a drain port. The oil inlet is connected to both the oil outlet and the drain port, and the oil outlet is connected to the single oil circuit.

[0029] A steel ball, which is movably disposed within the valve body;

[0030] A push rod is movably disposed within the valve body, one end of which abuts against the steel ball. The push rod is used to press the steel ball between the oil inlet and the oil outlet of the valve body based on a preset lubrication pressure, so as to disconnect the connection between the oil inlet and the oil outlet of the valve body when the oil pressure at the oil inlet of the valve body is less than the preset lubrication pressure.

[0031] If the engine is in positive power mode, the brake solenoid valve is set based on a preset lubrication pressure to lubricate the engine with the oil in the single oil circuit, including:

[0032] Based on the preset lubrication pressure, a push rod control signal is sent to the preset solenoid valve, causing the push rod to abut against the steel ball based on the push rod control signal.

[0033] In one possible implementation, the braking solenoid valve further includes:

[0034] The solenoid valve moving iron is slidably disposed in the valve body, and the movable end of the solenoid valve moving iron abuts against the other end of the push rod;

[0035] A first slider is slidably disposed within the valve body. The first slider has a first oil drain channel, one end of which is connected to the oil drain port of the valve body. The steel ball is movably abutting against one end of the first oil drain channel.

[0036] The second slider is slidably disposed in the valve body. The second slider, the valve body, and the first slider form an independent oil chamber. The second slider has a second oil drain channel. The independent oil chamber is connected to the other end of the first oil drain channel and one end of the second oil drain channel. The other end of the second oil drain channel is connected to the oil inlet of the valve body and the oil outlet of the valve body. The second slider is used to slide to change the opening degree of the oil inlet of the valve body and the opening degree of the oil outlet of the valve body.

[0037] A pressure regulating spring is disposed in the independent oil chamber. The two ends of the pressure regulating spring abut against the first slider and the second slider, respectively. The sliding trajectory of the solenoid valve moving iron, the sliding trajectory of the push rod, the sliding trajectory of the steel ball, the sliding trajectory of the first slider, the axis of the first oil drain channel, the axis of the pressure regulating spring, the sliding trajectory of the second slider, and the axis of the second oil drain channel are all located on the same straight line.

[0038] If the engine is in braking mode, the brake solenoid valve is opened based on a preset braking pressure, causing the oil in the single oil circuit to drive the brake rocker arm for braking, including:

[0039] Based on the preset lubrication pressure, a moving iron control signal is sent to the preset solenoid valve, causing the moving iron of the solenoid valve to push the push rod based on the moving iron control signal.

[0040] The present invention also provides an engine braking control method, applied to an engine braking control device, the engine braking control device comprising:

[0041] A rocker arm shaft, which is connected to a braking rocker arm via a drive mechanism, and a single oil passage is provided inside the rocker arm shaft;

[0042] A brake solenoid valve, wherein the oil outlet of the brake solenoid valve is connected to the oil inlet of the single oil circuit, and the brake solenoid valve is used to control the oil in the single oil circuit to lubricate the engine and drive the brake rocker arm to brake.

[0043] The engine braking control method includes:

[0044] Obtain the engine operating mode;

[0045] If the engine is in positive power mode, the brake solenoid valve is set based on the preset lubrication pressure so that the oil in the single oil circuit lubricates the engine.

[0046] If the engine is in braking mode, the brake solenoid valve is opened based on the preset braking pressure, so that the oil in the single oil circuit drives the brake rocker arm to brake.

[0047] In one possible implementation, the braking solenoid valve includes:

[0048] The valve body has an oil inlet, an oil outlet, and a drain port. The oil inlet is connected to both the oil outlet and the drain port, and the oil outlet is connected to the single oil circuit.

[0049] A steel ball, which is movably disposed within the valve body;

[0050] A push rod is movably disposed within the valve body, one end of which abuts against the steel ball. The push rod is used to press the steel ball between the oil inlet and the oil outlet of the valve body based on a preset lubrication pressure, so as to disconnect the connection between the oil inlet and the oil outlet of the valve body when the oil pressure at the oil inlet of the valve body is less than the preset lubrication pressure.

[0051] If the engine is in positive power mode, the brake solenoid valve is set based on a preset lubrication pressure to lubricate the engine with the oil in the single oil circuit, including:

[0052] Based on the preset lubrication pressure, a push rod control signal is sent to the preset solenoid valve, causing the push rod to abut against the steel ball based on the push rod control signal.

[0053] In one possible implementation, the braking solenoid valve further includes:

[0054] The solenoid valve moving iron is slidably disposed in the valve body, and the movable end of the solenoid valve moving iron abuts against the other end of the push rod;

[0055] A first slider is slidably disposed within the valve body. The first slider has a first oil drain channel, one end of which is connected to the oil drain port of the valve body. The steel ball is movably abutting against one end of the first oil drain channel.

[0056] The second slider is slidably disposed in the valve body. The second slider, the valve body, and the first slider form an independent oil chamber. The second slider has a second oil drain channel. The independent oil chamber is connected to the other end of the first oil drain channel and one end of the second oil drain channel. The other end of the second oil drain channel is connected to the oil inlet of the valve body and the oil outlet of the valve body. The second slider is used to slide to change the opening degree of the oil inlet of the valve body and the opening degree of the oil outlet of the valve body.

[0057] A pressure regulating spring is disposed in the independent oil chamber. The two ends of the pressure regulating spring abut against the first slider and the second slider, respectively. The sliding trajectory of the solenoid valve moving iron, the sliding trajectory of the push rod, the sliding trajectory of the steel ball, the sliding trajectory of the first slider, the axis of the first oil drain channel, the axis of the pressure regulating spring, the sliding trajectory of the second slider, and the axis of the second oil drain channel are all located on the same straight line.

[0058] If the engine is in braking mode, the brake solenoid valve is opened based on a preset braking pressure, causing the oil in the single oil circuit to drive the brake rocker arm for braking, including:

[0059] Based on the preset lubrication pressure, a moving iron control signal is sent to the preset solenoid valve, causing the moving iron of the solenoid valve to push the push rod based on the moving iron control signal.

[0060] The beneficial effects of this invention are:

[0061] This invention provides an engine braking control device, system, and method. It primarily achieves braking control by controlling the oil in the rocker arm shaft through a brake solenoid valve. Unlike existing technologies, the rocker arm shaft in this invention employs a single oil circuit design, where the single oil circuit serves both lubrication and braking. By controlling the opening and closing of the brake solenoid valve, both braking and lubrication functions can be achieved simultaneously. When the engine is in positive power mode, the brake solenoid valve can be set based on a preset lubrication pressure, acting as a pressure-reducing valve to release pressure from the oil in the single oil circuit, thereby achieving lubrication. When the engine is in braking mode, the brake solenoid valve can be opened based on a preset braking pressure, allowing oil at the preset braking pressure to enter the single oil circuit to drive the braking rocker arm for braking. Compared to existing technologies, the single oil circuit design of this invention significantly reduces the machining difficulty of the rocker arm shaft. Furthermore, this invention can release pressure through the brake solenoid valve, eliminating the need to consider the engine's high and low operating speeds when adjusting the lubrication oil pressure in the valve train. This reduces the requirements for the engine oil pump's capacity, solving not only the high machining difficulty of existing engine auxiliary braking systems but also the design difficulties of the lubrication system in existing engine auxiliary braking systems. Attached Figure Description

[0062] Figure 1 This is a schematic diagram of the existing technology;

[0063] Figure 2 This is a schematic diagram of an embodiment of the engine braking control device provided by the present invention;

[0064] Figure 3 A schematic diagram of the structure of the brake solenoid valve in one embodiment of the engine brake control device provided by the present invention;

[0065] Figure 4 This is a system architecture diagram of an embodiment of the engine braking control system provided by the present invention;

[0066] Figure 5 This is a flowchart of an embodiment of the engine braking control method provided by the present invention. Detailed Implementation

[0067] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0068] Figure 1 This is a schematic diagram of the existing engine braking hydraulic circuit, which mainly consists of a brake solenoid valve 110, a dual hydraulic circuit connector 120, and a dual hydraulic circuit rocker arm shaft 130. The brake solenoid valve 110 is located on the dual hydraulic circuit connector 120 and controls the opening and closing of the brake hydraulic circuit 121 of the dual hydraulic circuit connector 120 to achieve the braking function. Simultaneously, the brake hydraulic circuit 121 is also connected to the brake hydraulic passage 131 of the dual hydraulic circuit rocker arm shaft. The lubrication hydraulic circuit 122 of the dual hydraulic circuit connector 120 is constantly connected to the lubrication hydraulic passage 132 in the dual hydraulic circuit rocker arm shaft 130 to achieve real-time lubrication of the engine.

[0069] It is evident that existing technologies require four oil passages within the aforementioned small structures to achieve both lubrication and braking functions, demanding advanced processing techniques and increasing manufacturing costs. Furthermore, the oil passages used for braking and lubrication have different oil pressure requirements during operation, and the lubrication passages need to be constantly open. To ensure both functions are achieved, the lubrication oil pressure in the valve train must consider both high and low engine speeds, employing a design with excess lubrication pressure. This places high demands on the engine oil pump's capacity and also increases the development difficulty of the engine's low-pressure lubrication system.

[0070] And combined Figure 2 As shown, a specific embodiment of the present invention discloses an engine braking control device, comprising:

[0071] A rocker arm shaft 210 is provided, which is connected to a braking rocker arm. A single oil passage 211 is provided inside the rocker arm shaft 210.

[0072] The brake solenoid valve 220 has its oil outlet connected to the oil inlet of the single oil circuit 211. The brake solenoid valve 220 is used to control the engine oil in the single oil circuit 211 to lubricate the engine and drive the brake rocker arm to brake.

[0073] This invention primarily achieves braking control by controlling the oil in the rocker arm shaft 210 through a brake solenoid valve 220. Unlike existing technologies, the rocker arm shaft 210 in this invention employs a single oil passage 211 design, where the single oil passage 211 serves both lubrication and braking. By controlling the opening and closing of the brake solenoid valve 220, both braking and lubrication functions can be achieved simultaneously. When the engine is in positive power mode, the brake solenoid valve 220 can be set based on a preset lubrication pressure, acting as a pressure relief valve to release the oil in the single oil passage 211, thereby achieving the lubrication function. When the engine is in braking mode, the brake solenoid valve 220 can be opened based on a preset braking pressure, allowing oil at the preset braking pressure to enter the single oil passage 211 to drive the brake rocker arm for braking. Compared with the prior art, the single oil circuit 211 design of the present invention greatly reduces the machining difficulty of the rocker arm shaft 210. In addition, the present invention can also release pressure through the brake solenoid valve 220, so that the lubricating oil pressure of the valve train does not need to take into account the high and low operating speeds of the engine, and the requirements for the engine oil pump capacity are low. This not only solves the problem of high machining difficulty in the existing engine auxiliary braking system, but also solves the problem of difficult lubrication system design in the existing engine auxiliary braking system.

[0074] Furthermore, in combination Figure 3 As shown, in a preferred embodiment, the brake solenoid valve 220 includes:

[0075] The valve body 2201 has an oil inlet 2202, an oil outlet 2203, and an oil drain 2204. The oil inlet 2202 is connected to both the oil outlet 2203 and the oil drain 2204. The oil outlet 2203 is connected to the single oil circuit 211.

[0076] Steel ball 2205, which is movably disposed within valve body 2201;

[0077] A push rod 2206 is movably disposed within the valve body 2201. One end of the push rod 2206 abuts against the steel ball 2205. The push rod 2206 is used to press the steel ball 2205 between the valve body oil inlet 2202 and the valve body oil drain 2204 based on a preset lubrication pressure, so as to disconnect the connection between the valve body oil inlet 2202 and the valve body oil drain 2204 when the oil pressure at the valve body oil inlet 2202 is less than the preset lubrication pressure.

[0078] Other details of the aforementioned brake solenoid valve 220 are existing technologies and will not be elaborated upon herein. In this embodiment, the push rod 2206 can be controlled to press against the steel ball 2205 based on a preset lubrication pressure, enabling the steel ball 2205 to control the opening and closing of the valve body oil inlet 2202 and valve body oil outlet 2204 with a preset lubrication pressure, thereby achieving the pressure relief function and ensuring a low-pressure state for the lubricating oil.

[0079] Furthermore, in a preferred embodiment, the brake solenoid valve 220 further includes:

[0080] The solenoid valve moving iron 2207 is slidably disposed in the valve body 2201, and the movable end of the solenoid valve moving iron 2207 abuts against the other end of the push rod 2206.

[0081] The first slider 2208 is slidably disposed inside the valve body 2201. The first slider 2208 has a first oil drain channel 2209. One end of the first oil drain channel 2209 is connected to the oil drain port 2204 of the valve body. The steel ball 2205 is movably abutting against one end of the first oil drain channel 2209.

[0082] The second slider 2210 is slidably disposed within the valve body 2201. The second slider 2210, the valve body 2201, and the first slider 2208 form an independent oil chamber. The second slider 2210 has a second oil drain channel 2211. The independent oil chamber is simultaneously connected to the other end of the first oil drain channel 2209 and one end of the second oil drain channel 2211. The other end of the second oil drain channel 2211 is connected to the valve body inlet 2202 and the valve body outlet 2203. The second slider 2210 is used to slide to change the opening degree of the valve body inlet 2202 and the opening degree of the valve body outlet 2203.

[0083] A pressure regulating spring 2212 is disposed in the independent oil chamber. The two ends of the pressure regulating spring 2212 abut against the first slider 2208 and the second slider 2210, respectively. The sliding trajectory of the solenoid valve moving iron 2207, the sliding trajectory of the push rod 2206, the sliding trajectory of the steel ball 2205, the sliding trajectory of the first slider 2208, the axis of the first oil drain channel 2209, the axis of the pressure regulating spring 2212, the sliding trajectory of the second slider 2210, and the axis of the second oil drain channel 2211 are all located on the same straight line.

[0084] Similarly, other details of the aforementioned brake solenoid valve 220 are also existing technologies, and therefore will not be described in detail here. In this embodiment, the moving iron 2207 of the solenoid valve can be controlled to push the push rod 2206 and the steel ball 2205 to move. This utilizes the oil pressure in the independent oil chamber in conjunction with the pressure regulating spring 2212 to further push the first slider 2208 and the second slider 2210 in the brake solenoid valve 220, thereby changing the opening degree of the valve body oil inlet 2202 and the opening degree of the valve body oil outlet 2203. This allows the engine oil to enter the rocker arm shaft 210 without depressurization, thus performing the braking function.

[0085] Furthermore, in a preferred embodiment, the engine braking control device further includes:

[0086] A single-channel connector 230, one of its channels is connected to the oil outlet of the brake solenoid valve 220, and the other channel is connected to the oil inlet of the single oil circuit 211.

[0087] In the prior art, the design of two oil passages in the rocker arm shaft 210—one for lubrication and one for braking—needs to create a dual oil passage in the connector between the rocker arm shaft 210 and the valve. However, this invention allows for a single oil passage in the structure connecting the rocker arm shaft 210 and the braking solenoid valve 220, as shown in the single-channel connector 230 of this embodiment, further reducing the processing difficulty and cost of the entire device in this embodiment.

[0088] Furthermore, in combination Figure 4 As shown, the present invention also provides an engine braking control system 400, which includes a rocker arm shaft 401, a brake solenoid valve 402, and a control module 403 as described above. The control module is electrically connected to the brake solenoid valve and is used for:

[0089] Obtain the engine operating mode;

[0090] If the engine is in positive power mode, the brake solenoid valve is set based on the preset lubrication pressure so that the oil in the single oil circuit lubricates the engine.

[0091] If the engine is in braking mode, the brake solenoid valve is opened based on the preset braking pressure, so that the oil in the single oil circuit drives the brake rocker arm to brake.

[0092] The control module can be implemented using any existing hardware with computational and control functions. The principles and beneficial effects of the above system can be found in the preceding description, and will not be elaborated upon here.

[0093] Furthermore, in a preferred embodiment, the system further includes the valve body, steel ball, and push rod as described above, wherein the control module:

[0094] If the engine is in positive power mode, the brake solenoid valve is set based on a preset lubrication pressure to lubricate the engine with the oil in the single oil circuit, including:

[0095] Based on the preset lubrication pressure, a push rod control signal is sent to the preset solenoid valve, causing the push rod to abut against the steel ball based on the push rod control signal.

[0096] Furthermore, in a preferred embodiment, the system further includes the solenoid valve moving iron, the first slider, the second slider, and the pressure regulating spring as described above, wherein the control module includes:

[0097] If the engine is in braking mode, the brake solenoid valve is opened based on a preset braking pressure, causing the oil in the single oil circuit to drive the brake rocker arm for braking, including:

[0098] Based on the preset lubrication pressure, a moving iron control signal is sent to the preset solenoid valve, causing the moving iron of the solenoid valve to push the push rod based on the moving iron control signal.

[0099] Furthermore, in combination Figure 5 As shown, the present invention also provides an engine braking control method, applied to the engine braking control device described above, the engine braking control method comprising:

[0100] S501, Obtain engine operating mode;

[0101] S502. If the engine is in the positive power mode, the brake solenoid valve is set based on the preset lubrication pressure so that the oil in the single oil circuit lubricates the engine.

[0102] S503. If the engine is in braking mode, the brake solenoid valve is opened based on the preset braking pressure, so that the oil in the single oil circuit drives the brake rocker arm to brake.

[0103] Furthermore, in a preferred embodiment, the brake solenoid valve further includes the valve body, steel ball, and push rod as described above. In step S502, if the engine is in positive power mode, the brake solenoid valve is set based on a preset lubrication pressure to lubricate the engine with the oil in the single oil circuit. Specifically, this includes:

[0104] Based on the preset lubrication pressure, a push rod control signal is sent to the preset solenoid valve, causing the push rod to abut against the steel ball based on the push rod control signal.

[0105] Furthermore, in a preferred embodiment, the brake solenoid valve further includes the solenoid valve moving iron, the first slider, the second slider, and the pressure adjusting spring as described above. In step S503, if the engine is in braking mode, the brake solenoid valve is opened based on a preset braking pressure, causing the oil in the single oil circuit to drive the brake rocker arm for braking. Specifically, this includes:

[0106] Based on the preset lubrication pressure, a moving iron control signal is sent to the preset solenoid valve, causing the moving iron of the solenoid valve to push the push rod based on the moving iron control signal.

[0107] The present invention also provides a preferred embodiment to more clearly illustrate the above-described engine braking control device, system, and method:

[0108] This embodiment proposes an engine braking control device and method, wherein the device mainly consists of a brake solenoid valve with a brake solenoid valve, a single-channel connector (specifically a single-channel oil pipe), and a single-oil-circuit rocker arm shaft. The brake solenoid valve controls the oil pressure in the single-channel connector and the single-oil-circuit rocker arm shaft. When the engine is in a non-engine braking active state, the brake solenoid valve does not open. This valve is equivalent to a pressure reducing valve. The reduced oil pressure meets the lubrication requirements of the valve train mechanism. The brake solenoid valve maintains a lower oil pressure to meet the lubrication requirements of the valve train mechanism, which can reduce the flow requirements of the lubricating oil in the valve train mechanism and support the flow requirements of other parts of the engine's low-pressure lubrication system. When the engine is in a braking state, the brake solenoid valve opens. At this time, it is equivalent to the oil passage being always open, without reducing the oil pressure entering the solenoid valve, ensuring a higher pressure for the brake rocker arm to open. The brake solenoid valve controls a higher oil pressure to ensure that the brake rocker arm can open and work. In addition, the output pressure of the brake solenoid valve is maintained at intervals to prevent the brake rocker arm from opening abnormally due to high oil pressure under lubrication conditions.

[0109] For the brake solenoid valve with oil pressure regulation function in this embodiment, when the engine is running in positive power mode, the steel ball is pushed open by the oil pressure. Under the control of the pressure-limiting spring, the oil in the valve body inlet maintains the oil pressure balance of the valve body drain port, valve body inlet port, and valve body outlet port of the limiting body at a low outlet pressure. This pressure ensures that the brake rocker arm control valve cannot be driven to open, but can maintain normal lubrication. When the engine is running in braking mode, the moving iron of the solenoid valve pushes the push rod, and the push rod presses the steel ball onto the oil port leading to the valve body drain port (i.e., one end of the first drain channel in the first slider). Under the action of the pressure-limiting spring, the second slider is pushed to move towards the valve body outlet port of the limiting body, ensuring that the valve body inlet port and the side oil port on the second slider have a large overlap, reducing the throttling pressure drop, ensuring that the valve body outlet port has a high oil pressure output, and ensuring that the brake rocker arm control valve can open and work normally.

[0110] In this embodiment, the shared oil circuit design for engine braking and lubrication greatly improves the ease of designing and machining the long oil passage of the rocker arm shaft, and significantly reduces production costs.

[0111] Furthermore, this paper proposes for the first time an engine braking control oil circuit and method with a shared oil passage design for braking and lubrication. In this embodiment, the engine braking oil circuit design and the oil storage design of the shared oil passage eliminate the need for a large amount of brake oil replenishment during the positive power braking switching process, greatly improving the oil filling efficiency of the braking oil circuit and significantly improving the response speed of the brake rocker arm. It also cleverly reduces the demand of the valve train braking mechanism on the amount of engine lubricating oil, strongly supports the development of low-pressure lubrication systems for engines, reduces engine friction and wear power consumption, and improves the economic performance of the engine.

[0112] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An engine brake control device characterized by comprising: include: A rocker arm shaft, which is connected to a braking rocker arm via a drive mechanism, and a single oil passage is provided inside the rocker arm shaft; A brake solenoid valve, wherein the oil outlet of the brake solenoid valve is connected to the oil inlet of the single oil circuit, and the brake solenoid valve is used to control the oil in the single oil circuit to lubricate the engine and drive the brake rocker arm to brake. The braking solenoid valve includes: The valve body has an oil inlet, an oil outlet, and a drain port. The oil inlet is connected to both the oil outlet and the drain port, and the oil outlet is connected to the single oil circuit. A steel ball, which is movably disposed within the valve body; A push rod is movably disposed within the valve body, one end of which abuts against the steel ball. The push rod is used to press the steel ball between the oil inlet and the oil outlet of the valve body based on a preset lubrication pressure, so as to disconnect the connection between the oil inlet and the oil outlet of the valve body when the oil pressure at the oil inlet of the valve body is less than the preset lubrication pressure. The solenoid valve moving iron is slidably disposed in the valve body, and the movable end of the solenoid valve moving iron abuts against the other end of the push rod; A first slider is slidably disposed within the valve body. The first slider has a first oil drain channel, one end of which is connected to the oil drain port of the valve body. The steel ball is movably abutting against one end of the first oil drain channel. The second slider is slidably disposed in the valve body. The second slider, the valve body, and the first slider form an independent oil chamber. The second slider has a second oil drain channel. The independent oil chamber is connected to the other end of the first oil drain channel and one end of the second oil drain channel. The other end of the second oil drain channel is connected to the oil inlet of the valve body and the oil outlet of the valve body. The second slider is used to slide to change the opening degree of the oil inlet of the valve body and the opening degree of the oil outlet of the valve body. A pressure regulating spring is disposed in the independent oil chamber. The two ends of the pressure regulating spring abut against the first slider and the second slider, respectively. The sliding trajectory of the solenoid valve moving iron, the sliding trajectory of the push rod, the sliding trajectory of the steel ball, the sliding trajectory of the first slider, the axis of the first oil drain channel, the axis of the pressure regulating spring, the sliding trajectory of the second slider, and the axis of the second oil drain channel are all located on the same straight line.

2. The engine brake control device of claim 1, wherein Also includes: A single-channel connector, wherein one channel of the single-channel connector is connected to the oil outlet of the brake solenoid valve, and the other channel of the single-channel connector is connected to the oil inlet of the single oil circuit.

3. An engine braking control system, characterized in that, include: The engine braking control device as described in any one of claims 1-2; The control module is electrically connected to the brake solenoid valve, and the control module is used for: Obtain the engine operating mode; If the engine is in positive power mode, the brake solenoid valve is set based on the preset lubrication pressure so that the oil in the single oil circuit lubricates the engine. If the engine is in braking mode, the brake solenoid valve is opened based on the preset braking pressure, so that the oil in the single oil circuit drives the brake rocker arm to brake.

4. The engine braking control system according to claim 3, characterized in that, If the engine is in positive power mode, the brake solenoid valve is set based on a preset lubrication pressure to lubricate the engine with the oil in the single oil circuit, including: Based on the preset lubrication pressure, a push rod control signal is sent to the preset solenoid valve, causing the push rod to abut against the steel ball based on the push rod control signal.

5. The engine braking control system according to claim 4, characterized in that, If the engine is in braking mode, the brake solenoid valve is opened based on a preset braking pressure, causing the oil in the single oil circuit to drive the brake rocker arm for braking, including: Based on the preset lubrication pressure, a moving iron control signal is sent to the preset solenoid valve, causing the moving iron of the solenoid valve to push the push rod based on the moving iron control signal.

6. An engine braking control method, characterized in that, The engine braking control method, applied to the engine braking control device as described in any one of claims 1-2, comprises: Obtain the engine operating mode; If the engine is in positive power mode, the brake solenoid valve is set based on the preset lubrication pressure so that the oil in the single oil circuit lubricates the engine. If the engine is in braking mode, the brake solenoid valve is opened based on the preset braking pressure, so that the oil in the single oil circuit drives the brake rocker arm to brake.

7. The engine braking control method according to claim 6, characterized in that, If the engine is in positive power mode, the brake solenoid valve is set based on a preset lubrication pressure to lubricate the engine with the oil in the single oil circuit, including: Based on the preset lubrication pressure, a push rod control signal is sent to the preset solenoid valve, causing the push rod to abut against the steel ball based on the push rod control signal.

8. The engine braking control method according to claim 7, characterized in that, If the engine is in braking mode, the brake solenoid valve is opened based on a preset braking pressure, causing the oil in the single oil circuit to drive the brake rocker arm for braking, including: Based on the preset lubrication pressure, a moving iron control signal is sent to the preset solenoid valve, causing the moving iron of the solenoid valve to push the push rod based on the moving iron control signal.

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