An in-cylinder braking type automotive engine

Abstract

The present invention discloses an in-cylinder braking type automotive engine, belonging to the technical field of automotive braking. It includes a set of cylinders of the in-cylinder braking type automotive engine, an intake pipe of the in-cylinder braking type automotive engine, and an exhaust pipe of the in-cylinder braking type automotive engine. The intake ports and exhaust ports of each cylinder are respectively connected to the intake pipe and the exhaust pipe in the front and rear order of the outer ports of the intake pipe and the exhaust pipe. It further includes an intake and exhaust cycle supercharging control device; the intake and exhaust cycle supercharging control device includes a controller, an actuator, and an intake and exhaust cycle supercharging pipe. The actuator includes an intake pipe opening and closing self-control valve, a cycle supercharging pipe opening and closing self-control valve, and a front end throttling self-control valve of the exhaust pipe. The intake and exhaust cycle supercharging control device forms the intake passage of the braking cylinder from the exhaust passage of the supercharging cylinder, so that the braking cylinder generates additional vehicle driving resistance during the compression stroke. It has the characteristics of reasonable structure, good braking performance, high safety and reliability, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive braking. Background Art

[0002] Automobiles face the problem of speed control when going downhill, especially trucks. The greater the load weight, the greater the potential energy contained when going downhill. To control the speed, it is necessary to effectively reduce the potential energy. If only the brake pads are relied on to consume its potential energy to control the speed, due to the long braking time, during the long braking pad friction (potential energy conversion) process, the brake drum will overheat, and dangerous situations such as tire fires and brake failures are likely to occur. Most large trucks are equipped with exhaust brakes, although the problem is alleviated to a certain extent, but the effect is not very ideal. At present, the relatively advanced exhaust valve brake (for example, the Weichai WEVB exhaust valve brake system) has an ideal braking effect, but in the case of heavy vehicles and steep slopes, the braking force is still insufficient, which affects driving safety to a certain extent. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an in-cylinder braking type automotive engine, which has the characteristics of reasonable structure, good braking performance, high safety and reliability, etc.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is:

[0005] An in-cylinder braking type automotive engine includes a set of cylinders of the in-cylinder braking type automotive engine, an intake pipe of the in-cylinder braking type automotive engine, and an exhaust pipe of the in-cylinder braking type automotive engine. The intake ports of each cylinder and the exhaust ports of each cylinder are respectively communicated with the intake pipe and the exhaust pipe in the front and rear order of the outer ports of the intake pipe and the exhaust pipe. It further includes an intake and exhaust circulation supercharging control device;

[0006] The intake and exhaust circulation supercharging control device includes a controller, an actuator, and an intake and exhaust circulation supercharging pipe. The actuator includes an intake pipe opening and closing automatic control valve, a circulation supercharging pipe opening and closing automatic control valve, and an exhaust pipe front end throttling automatic control valve; the intake pipe opening and closing automatic control valve is arranged on the intake pipe and is located between any two adjacent cylinder intake ports. Taking the intake pipe opening and closing automatic control valve as the boundary, the cylinders located at its front end are supercharging cylinders, and the cylinders located at its rear end are braking cylinders; the intake pipe located at the front end of the intake pipe opening and closing automatic control valve is the front section intake pipe, and the intake pipe located at its rear end is the rear section intake pipe; the exhaust pipe front end throttling automatic control valve is arranged on the exhaust pipe and is located at the front end of the exhaust port of the frontmost supercharging cylinder. The intake port of the intake and exhaust circulation supercharging pipe is communicated with the exhaust pipe and is located at the rear end of the exhaust pipe front end throttling automatic control valve. The exhaust port of the intake and exhaust circulation supercharging pipe is communicated with the intake pipe and is located at the rear end of the intake pipe opening and closing automatic control valve. The circulation supercharging pipe opening and closing automatic control valve is arranged on the intake and exhaust circulation supercharging pipe; the exhaust pipe located at the rear end of the exhaust pipe front end throttling automatic control valve is the rear section exhaust pipe;

[0007] The controller is used to receive the in-cylinder brake start control signal, which is a start control signal of the in-cylinder brake type automobile engine auxiliary brake device, so as to control the in-cylinder brake type automobile engine to switch from the fuel working state to the in-cylinder brake working state;

[0008] The signal output end of the controller outputs a brake cylinder boost control signal to control the action of each actuator and switch the in-cylinder brake type automobile engine to the enhanced braking working state: the intake pipe opening and closing automatic control valve is switched from open to closed, the circulation boost pipe opening and closing automatic control valve is switched from closed to open, and the exhaust pipe front end throttling automatic control valve is switched from open to closed, thereby changing the intake and exhaust passages of the boost cylinder and the brake cylinder: the front section of the intake pipe forms the intake passage of the boost cylinder, and the rear section of the exhaust pipe, the intake and exhaust circulation boost pipe and the rear section of the intake pipe form the intake passage of the brake cylinder, thereby forming the exhaust passage of the boost cylinder into the intake passage of the brake cylinder.

[0009] The present invention is further improved in that:

[0010] The in-cylinder brake type automobile engine has four cylinders and one supercharged cylinder.

[0011] The in-cylinder brake type automobile engine is an automobile engine that utilizes WEVB exhaust valve braking technology.

[0012] The beneficial effects of adopting the above technical solution are:

[0013] The present invention adds an intake and exhaust cycle boost control device in the engine. After the intake and exhaust cycle boost control device is started, the intake and exhaust passages of the corresponding cylinder are changed, and the cylinder is functionally divided into a boost cylinder and a brake cylinder. The exhaust passage of the boost cylinder forms the intake passage of the brake cylinder. After the boost cylinder compresses the air through the exhaust stroke (the boost cylinder plays the role of an air compressor at this time), the compressed air is then transported to the brake cylinder, thereby increasing the air input amount of the brake cylinder. The brake cylinder will greatly increase the air pressure in the cylinder during the compression stroke, so as to generate a larger running resistance to the piston in the brake cylinder during the compression stroke, so that the brake cylinder absorbs more energy during the compression stroke. Therefore, during the compression stroke, the brake cylinder in the present device will generate additional vehicle running resistance than the ordinary cylinder of the in-cylinder brake type automobile engine. Thus, the vehicle running resistance is increased and the braking performance is improved.

[0014] The invention has the characteristics of reasonable structure, good braking performance, high safety and reliability, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] In the accompanying drawings: 1. Cylinder; 2. Intake pipe; 2-1. Front-section intake pipe; 2-2. Rear-section intake pipe; 3. Exhaust pipe; 3-1. Rear-section exhaust pipe; 4. Intake and exhaust circulation supercharging pipe; 5. Intake pipe opening and closing automatic control valve; 6. Circulation supercharging pipe opening and closing automatic control valve; 7. Exhaust pipe front-end throttling automatic control valve.

[0017] Throttling automatic control valve: A type of two-position automatic control valve, having two working states of opening and closing. The valve core is driven relative to the valve seat through electric, pneumatic, hydraulic or electromagnetic means to control the opening and closing of the valve. When the throttling automatic control valve is in the open state, a passage is formed between the valve core and the valve seat. When the throttling automatic control valve is in the closed state, the valve core and the valve seat do not completely close, but there is a certain throttling section or throttling hole to throttle the fluid, so as to form a pressure difference between the front end and the rear end of the valve. For example, an exhaust brake valve.

[0018] The in-cylinder braking type automotive engine in the present invention refers to an automotive engine with in-cylinder braking function in the prior art. By adding an auxiliary braking device in the engine, when the automotive electronic control system receives an in-cylinder braking start control signal, the automotive electronic control system controls the fuel supply control device to act to stop fuel supply to the in-cylinder braking type automotive engine, so that the in-cylinder braking type automotive engine stops fuel work. At the same time, the automotive electronic control system controls the in-cylinder braking type automotive engine auxiliary braking device to act, converting the power-generating engine into an air compressor that absorbs energy. This conversion can open the exhaust valve near the end of the compression stroke of the engine piston, allowing the compressed air to be released. The energy absorbed by the engine when compressing the gas in the compression stroke cannot return to the engine piston in the subsequent expansion stroke, but is dissipated through the exhaust and heat dissipation systems of the engine, generating effective engine braking, slowing down the vehicle speed, and helping heavy trucks or buses control vehicle deceleration when continuously going downhill, and safely and quickly passing through long downhill sections. For example, the Weichai automotive engine using the WEVB exhaust valve braking technology. Specific embodiments

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] The standard parts used in the present invention can all be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the accompanying drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, welding, and pasting that are mature in the prior art, and will not be elaborated here.

[0021] By Figure 1As can be seen from the illustrated embodiment, this embodiment includes a set of cylinders 1 of an in-cylinder braking type automotive engine, an intake pipe 2 of the in-cylinder braking type automotive engine, and an exhaust pipe 3 of the in-cylinder braking type automotive engine. The intake ports and exhaust ports of each cylinder are respectively connected to the intake pipe 2 and the exhaust pipe 3 in the front-back order from the outer ports of the intake pipe 2 and the exhaust pipe 3. It further includes an intake and exhaust cycle supercharging control device;

[0022] The intake and exhaust cycle supercharging control device includes a controller, an actuator, and an intake and exhaust cycle supercharging pipe 4. The actuator includes an intake pipe opening and closing self-control valve 5 [Model: ZCN-100FS], a cycle supercharging pipe opening and closing self-control valve 6 [Model: ZCN-100FS], and a front-end throttling self-control valve 7 of the exhaust pipe [using an exhaust brake valve, Model: KE300 3541010-KE300]; The intake pipe opening and closing self-control valve 5 is arranged on the intake pipe 2 and is located between any two adjacent cylinder intake ports. Taking the intake pipe opening and closing self-control valve 5 as the boundary, let the cylinder 1 in front of it be a supercharging cylinder, and the cylinder 1 behind it be a braking cylinder, that is, there is at least one supercharging cylinder and one braking cylinder; The intake pipe 2 in front of the intake pipe opening and closing self-control valve 5 is the front-section intake pipe 2-1, and the intake pipe 2 behind it is the rear-section intake pipe 2-2; The front-end throttling self-control valve 7 of the exhaust pipe is arranged on the exhaust pipe 3 and is located in front of the exhaust port of the frontmost supercharging cylinder. The intake port of the intake and exhaust cycle supercharging pipe 4 is connected to the exhaust pipe 3 and is located behind the front-end throttling self-control valve 7 of the exhaust pipe. The exhaust port of the intake and exhaust cycle supercharging pipe 4 is connected to the intake pipe 2 and is located behind the intake pipe opening and closing self-control valve 5. The cycle supercharging pipe opening and closing self-control valve 6 is arranged on the intake and exhaust cycle supercharging pipe 4; Let the exhaust pipe 3 behind the front-end throttling self-control valve 7 of the exhaust pipe be the rear-section exhaust pipe 3-1;

[0023] The controller is used to receive an in-cylinder braking start control signal, and the in-cylinder braking start control signal is the start control signal of the auxiliary braking device of the in-cylinder braking type automotive engine, so as to control the in-cylinder braking type automotive engine to switch from the fuel working state to the in-cylinder braking working state;

[0024] When the signal input end of the automotive electronic control system and the controller receives the in-cylinder braking start control signal, the automotive electronic control system controls the fuel supply control device to act to stop fuel supply to the in-cylinder braking type automotive engine, so that the in-cylinder braking type automotive engine stops fuel work. The automotive electronic control system controls the auxiliary braking device of the in-cylinder braking type automotive engine to act, so that the in-cylinder braking type automotive engine switches from the fuel working state to the in-cylinder braking working state;

[0025] The signal output terminal of the controller outputs a brake cylinder pressure increasing control signal to control the actions of each actuator, and switches the in-cylinder braking type vehicle engine to the boosting braking working state: the intake pipe opening and closing self-control valve 5 is switched from open to closed, the circulating supercharging pipe opening and closing self-control valve 6 is switched from closed to open, and the exhaust pipe front end throttling self-control valve 7 is switched from open to closed, thereby changing the intake and exhaust passages of the supercharging cylinder and the braking cylinder: making the front section intake pipe 2-1 form the intake passage of the supercharging cylinder, and making the rear section exhaust pipe 3-1, the intake and exhaust circulating supercharging pipe 4 and the rear section intake pipe 2-2 form the intake passage of the braking cylinder, so as to form the exhaust passage of the supercharging cylinder into the intake passage of the braking cylinder;

[0026] The intake and exhaust circulating supercharging control device can be combined with the vehicle electronic control system into an integral structure, and the controller of the vehicle electronic control system can be compatible with the controller of the intake and exhaust circulating supercharging control device;

[0027] When the engine is running, under the action of the intake stroke of the supercharging cylinder, air is inhaled into the supercharging cylinder from the outer port of the intake pipe 2 through the front section intake pipe 2-1 and the supercharging cylinder intake port. During the exhaust stroke of the supercharging cylinder, the piston discharges the air inhaled by the supercharging cylinder from the supercharging cylinder exhaust port to the intake passage of the braking cylinder. Under the throttling action of the exhaust pipe front end throttling self-control valve 7, the continuously discharged air is compressed in the intake passage of the braking cylinder to form compressed gas, and the compressed gas is transported from the intake port of the braking cylinder to the inside of the braking cylinder to increase the input air pressure of the braking cylinder, thereby increasing the air pressure generated by the braking cylinder during the compression stroke, increasing the piston running resistance, so that the braking cylinder absorbs more energy during the compression stroke, increasing the vehicle driving resistance, and improving the braking performance.

[0028] The cylinders of the in-cylinder braking type vehicle engine are four, and the supercharging cylinder is one.

[0029] The in-cylinder braking type vehicle engine is a vehicle engine using the WVEB exhaust valve braking technology.

[0030] Working principle:

[0031] The mechanism of the in-cylinder braking type vehicle engine to increase the vehicle driving resistance is as described above: when the engine piston is close to the end of the compression stroke, the exhaust valve is opened to allow the compressed air to be released. The energy absorbed by the compressed gas by the engine during the compression stroke cannot return to the engine piston during the subsequent expansion stroke, but is dissipated through the engine exhaust and heat dissipation systems to generate effective engine braking.

[0032] Therefore, the braking force (vehicle driving resistance) generated by an in-cylinder braking automotive engine is produced by the energy absorbed when compressing the gas during the compression stroke (i.e., the resistance caused by the compressed air to the piston movement). The greater the pressure of the compressed air in the cylinder during the compression stroke, the greater the resistance to the piston movement. Since this air pressure is generated by compressing the air inhaled at the cylinder intake port, the greater the amount of air inhaled at the cylinder intake port, the greater the pressure generated during the compression stroke, and thus the greater the vehicle driving resistance and the better the braking effect.

[0033] Currently, the air inhaled at the cylinder intake port of an in-cylinder braking automotive engine is at atmospheric pressure, and the amount of air inhaled is relatively small. Therefore, the pressure generated during the compression stroke is relatively small. However, by adding an intake and exhaust cycle supercharging control device in the engine, after the intake and exhaust cycle supercharging control device is started, the intake and exhaust passages of the corresponding cylinder are changed, so that the cylinder is functionally divided into a supercharging cylinder and a braking cylinder. The exhaust passage of the supercharging cylinder forms the intake passage of the braking cylinder. After the supercharging cylinder compresses the air inhaled from the outer port of the intake pipe 2 during the exhaust stroke (the supercharging cylinder acts as an air compressor at this time), the compressed air is then transported into the braking cylinder, thereby increasing the air input volume of the braking cylinder. During the compression stroke of the braking cylinder, the air pressure in the cylinder will be increased to generate a greater running resistance to the piston in the braking cylinder during the compression stroke, increasing the vehicle driving resistance and improving the braking performance. Therefore, during the compression stroke, the braking cylinder in this device will generate additional vehicle driving resistance compared to the cylinder of a conventional in-cylinder braking automotive engine.

[0034] Since the magnitude of the driving resistance required when a vehicle decelerates and brakes downhill is positively correlated with the vehicle weight and the downhill slope, therefore, under the conditions of the vehicle's rated load and the maximum slope allowed on the road, the required driving resistance can be obtained through experiments.

[0035] The air input volume of the braking cylinder is the air discharge volume of the supercharging cylinder. The magnitude of the air discharge volume of the supercharging cylinder depends on the number, compression ratio, and displacement of the supercharging cylinder, as well as the throttling effect (air resistance) of the throttle self-control valve 7 at the front end of the exhaust pipe. There are various types of automotive engines, such as four-cylinder, six-cylinder, eight-cylinder, and twelve-cylinder engines. Therefore, through conventional experiments, by reasonably selecting the throttling air resistance of the throttle self-control valve 7 at the front end of the exhaust pipe and the quantity ratio of the braking cylinder to the supercharging cylinder, the driving resistance required when the vehicle decelerates and brakes downhill can be obtained, thereby achieving a satisfactory braking effect.

Claims

1. An in-cylinder braking type automotive engine, comprising a set of cylinders (1) of the in-cylinder braking type automotive engine, an intake pipe (2) of the in-cylinder braking type automotive engine, and an exhaust pipe (3) of the in-cylinder braking type automotive engine. The intake ports of the respective cylinders and the exhaust ports of the respective cylinders are respectively communicated with the intake pipe (2) and the exhaust pipe (3) in the front-rear order with respect to the outer ports of the intake pipe (2) and the outer ports of the exhaust pipe (3). It is characterized in that: It also includes an intake and exhaust cycle supercharging control device; The intake and exhaust cycle supercharging control device includes a controller, an actuator, and an intake and exhaust cycle supercharging pipe (4). The actuator includes an intake pipe opening and closing self-control valve (5), a cycle supercharging pipe opening and closing self-control valve (6), and a front end throttle self-control valve (7) of the exhaust pipe. The intake pipe opening and closing self-control valve (5) is arranged on the intake pipe (2) and is located between any two adjacent cylinder intake ports. Taking the intake pipe opening and closing self-control valve (5) as the boundary, the cylinder (1) located at its front end is a supercharging cylinder, and the cylinder (1) located at its rear end is a braking cylinder. The intake pipe (2) located at the front end of the intake pipe opening and closing self-control valve (5) is a front section intake pipe (2-1), and the intake pipe (2) located at its rear end is a rear section intake pipe (2-2). The front end throttle self-control valve (7) of the exhaust pipe is arranged on the exhaust pipe (3) and is located at the front end of the exhaust port of the frontmost supercharging cylinder. The intake port of the intake and exhaust cycle supercharging pipe (4) is communicated with the exhaust pipe (3) and is located at the rear end of the front end throttle self-control valve (7) of the exhaust pipe. The exhaust port of the intake and exhaust cycle supercharging pipe (4) is communicated with the intake pipe (2) and is located at the rear end of the intake pipe opening and closing self-control valve (5). The cycle supercharging pipe opening and closing self-control valve (6) is arranged on the intake and exhaust cycle supercharging pipe (4). Let the exhaust pipe (3) located at the rear end of the front end throttle self-control valve (7) of the exhaust pipe be a rear section exhaust pipe (3-1); The controller is used to receive an in-cylinder braking start control signal, which is the start control signal of the in-cylinder braking type automotive engine auxiliary braking device, to control the in-cylinder braking type automotive engine to switch from the fuel working state to the in-cylinder braking working state; The signal output end of the controller outputs a braking cylinder supercharging control signal to control the actions of each actuator, and switches the in-cylinder braking type automotive engine to the enhanced braking working state: the intake pipe opening and closing self-control valve (5) switches from open to closed, the cycle supercharging pipe opening and closing self-control valve (6) switches from closed to open, and the front end throttle self-control valve (7) of the exhaust pipe switches from open to closed, thereby changing the intake and exhaust passages of the supercharging cylinder and the braking cylinder: making the front section intake pipe (2-1) form the intake passage of the supercharging cylinder, making the rear section exhaust pipe (3-1), the intake and exhaust cycle supercharging pipe (4), and the rear section intake pipe (2-2) form the intake passage of the braking cylinder, and thus forming the intake passage of the braking cylinder from the exhaust passage of the supercharging cylinder.

2. The in-cylinder braking type automobile engine according to claim 1, characterized in that: The cylinders of the in-cylinder braking type automotive engine are four, and the supercharging cylinder is one.

3. A cylinder internal braking type automotive engine according to claim 1 or 2, characterized in that: The in-cylinder braking type automotive engine is an automotive engine that utilizes the WVEB exhaust valve braking technology.

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