CN201225209Y - Air intake auxiliary system - Google Patents

Abstract

An air inlet auxiliary system is characterized in that an auxiliary air inlet device is electrically connected to an electronic control unit and is in bypass connection with a main air inlet channel of a carburetor, and an air inlet end and an air outlet end of the auxiliary air inlet device are respectively connected between the carburetor and an air filter and between the carburetor and an engine. A temperature sensor, a rotating speed sensor, an accelerator position sensor and an oxygen content sensor on an exhaust pipe are electrically connected to the electronic control unit, and signals of the engine temperature, the engine rotating speed, the accelerator position, the oxygen content and the like obtained by detection are transmitted to the electronic control unit. The electronic control unit is according to the aperture of the supplementary air inlet unit of control such as engine temperature, engine speed, throttle position and oxygen content, the utility model discloses the air input of steerable supplementary admitting air to the air-fuel ratio that causes after the driving condition changes compensates the air input fast, revises it for best air-fuel ratio. Therefore, the vehicle can be burnt more completely by the extra air quantity when running at the medium and low speed, and the pollution chance is reduced.

Description

intake assist system

technical field

The utility model relates to an air intake auxiliary system, in particular to an air intake auxiliary system suitable for locomotives equipped with carburetors.

Background technique

Referring to Fig. 1, it is a schematic diagram of a locomotive system generally using a carburetor as an oil supply system. When the vehicle is started, the pure air section 1 of the main air intake channel from the carburetor will provide a pure air intake to mix with the gasoline sprayed from the oil cup (not shown), and then pass through the mixed oil-air section 2, and the engine will The generated suction makes the fuel gas enter the combustion chamber 3 for combustion.

Referring to FIG. 2 together with FIG. 1 , FIG. 2 is a schematic diagram of a conventional carburetor starter. The above-mentioned actuation process is that after the vehicle is started, the generator 4 is energized to the thermocouple resistor 5 to generate heat, and the temperature sensor (not shown) is thus heated and expanded to control the start-up valve 6 and the throttle nozzle 8 to control and supply the fuel needed for the engine to run. mixed gas. After heating for a period of time, it will be closed, and then all the functions of the vehicle fuel supply system will only cooperate with the main air inlet 1.

After the engine stops, due to the heat insulating material 7 in the starter, it can cooperate with the cooling characteristics of the engine to supply proper air mixture when restarting. Under the conditions of pure air section 1 and mixed oil-gas section 2, the warm-up performance of the vehicle sometimes cannot reach the required level, such as the poor acceleration of the cold car caused by excessive friction; or when the vehicle is running In order to consider the commercial demand of the product, the air-fuel ratio of each constant speed zone needs to be adjusted to a relatively rich state, but it will often have adverse effects on pollution and fuel consumption.

Utility model content

The purpose of this utility model is to provide an air intake assist system, which can control the intake air volume of its auxiliary intake air, and quickly compensate the intake air volume for the change of air-fuel ratio caused by the change of driving conditions.

The purpose of this utility model is achieved in that the air intake auxiliary system includes a carburetor, an auxiliary air intake device, a temperature sensor, a rotational speed sensor, a throttle position sensor, and an electronic control unit. The carburetor includes a main intake passage, a throttle nozzle, and a throttle, and the throttle nozzle and the throttle are all arranged in the main intake passage.

The above-mentioned auxiliary air intake device is connected to the main air intake passage by the side, and includes an air intake end and an air outlet end. The intake port is connected before the throttle nozzle, such as between the carburetor and the air filter, and the gas outlet is connected after the throttle, such as between the carburetor and the engine.

The temperature sensor, rotational speed sensor, and throttle position sensor are all electrically connected to the above-mentioned electronic control unit, and are used for detecting and transmitting engine temperature, engine rotational speed signal and throttle position signal respectively. The electronic control unit is also electrically connected to the above-mentioned auxiliary air intake device, and controls the opening and closing of the auxiliary air intake device according to received information such as engine temperature, engine speed, and opening of the accelerator. When the vehicle is idling and the detected engine temperature is lower than a working temperature, the electronic control unit controls the auxiliary air intake device to be turned on.

Through the function of the auxiliary air intake device of the air intake auxiliary system of the utility model, the rotational speed of the vehicle is increased, thereby speeding up the warm-up time of the vehicle and improving the stability of the idle speed of the vehicle.

The above-mentioned auxiliary air intake device can be an electromagnetic pulse type auxiliary air intake device, which performs time-controlled operation of full opening or full closing; it can also be a stepping motor type auxiliary air intake device, which can perform various degrees of valve opening, To control the air intake.

In addition, the electronic control unit can be set such that when the accelerator position sensor detects a momentary change in the accelerator position, the electronic control unit controls the auxiliary air intake device to close, thereby avoiding low mixture concentration or unnecessary opening.

The electronic control unit can be further set to control the auxiliary air intake device to close when the engine speed is equal to zero.

The utility model has the advantage that another aspect of the auxiliary air intake system is that when the engine temperature reaches the working temperature, the above-mentioned electronic control unit detects the throttle opening, the engine speed, and the content of the oxygen sensor according to the throttle position sensor. Oxygen level and other signals to control the opening or closing of the auxiliary air intake device, thereby controlling the intake air volume of the auxiliary intake air, quickly compensating the intake air volume for changes in the air-fuel ratio caused by changes in driving conditions, and correcting it to the optimum air-fuel ratio. Therefore, when the vehicle is running at a medium or low speed, the extra air volume can make the combustion more complete and reduce the chance of pollution.

Description of drawings

FIG. 1 is a schematic diagram of a conventional engine system equipped with a carburetor.

Fig. 2 is a schematic diagram of a conventional carburetor starter.

Fig. 3 is a schematic diagram of an intake assist system of a preferred embodiment of the present invention.

Fig. 4 is a flow chart of the intake assist operation of a preferred embodiment of the present invention.

Fig. 5 and Fig. 6 all are the flow charts of the special setting of the emergency accelerator of the intake assist operation of the utility model.

Explanation of main component symbols

Pure air section 1 mixed oil-gas section 2

Combustion chamber 3 Generator 4

Thermocouple resistor 5 Start valve 6

Insulation material 7 Throttle nozzle 8

Carburetor 10 Main intake passage 101

Pure air section 1011 mixed oil and gas section 1012

Throttle nozzle 102 Throttle 103

Auxiliary air intake device 11 Intake port 111

Gas outlet 112 Temperature sensor 12

Speed sensor 13 Electronic control unit 14

Cold car state calculation module 141 Hot car state calculation module 142

Throttle position sensor 15 Oxygen sensor 16

Air filter 17 Engine 18

exhaust pipe 19

Detailed ways

Refer to Figure 3. The air intake auxiliary system of the utility model is applied to a vehicle carrier equipped with a carburetor. The air intake auxiliary system includes a carburetor 10, an auxiliary air intake device 11, a temperature sensor 12, a rotational speed sensor 13, and an electronic control unit 14. An accelerator position sensor 15 and an oxygen sensor 16 on the exhaust pipe 19.

The carburetor 10 includes a main intake passage 101 , a throttle nozzle 102 , and a throttle 103 , and the throttle nozzle 102 and the throttle 103 are both disposed in the main intake passage 101 . The main intake passage 101 is divided into a pure air section 1011 and a mixed oil-air section 1012 by the throttle nozzle 102 and the throttle 103. The pure air section 1011 represents the section where pure air enters and has not passed through the throttle nozzle 102, while the mixed oil-air section 1012 represents The section where the air mixed with the fuel passes through the throttle nozzle 102 and the throttle 103 .

The auxiliary air intake device 11 is adjacent to the main air intake passage 101 and includes an air intake end 111 and an air outlet end 112 . The intake port 111 is connected before the throttle nozzle 102 , specifically, between the carburetor 10 and the air filter 17 , so as to serve as another branch path of the pure air of the main intake channel 101 . The air outlet 112 is connected behind the accelerator 103 , specifically between the carburetor 10 and the engine 18 , as the port for the above-mentioned branch air to enter the rear section of the carburetor, that is, the mixed oil-air section 1012 .

The vehicle carrier is also provided with a temperature sensor 12 that can detect the temperature of the engine, a speed sensor 13 that can detect the engine speed, and a throttle position sensor 15 that detects the opening position of the accelerator, and an oxygen sensor on the exhaust pipe 19. 16 , are electrically connected to the electronic control unit (ECU) 14 to transmit respective electronic signals to the electronic control unit 14 . The electronic control unit 14 is also electrically connected to the auxiliary air intake device 11 to control the opening and closing of the auxiliary air intake device 11 .

The auxiliary air intake device 11 is a general valve type device, and its state is set to be normally closed. It is preferable to use a stepping motor type auxiliary air intake device that can carry out various openings of different sizes. The description of the following embodiments is to use step In the case of the motor-type auxiliary air intake device. Of course, the electromagnetic pulse type (pulse) auxiliary air intake device that is fully opened or fully closed can also be used according to the requirements, and then the control mode of the electronic control unit to the auxiliary air intake device becomes to open a specific time.

Referring also to FIG. 4 , the operation of the air intake assist system of the present invention is described below with an example. Firstly, in step A, the temperature sensor 12 and the speed sensor 13 are used to detect the temperature and speed of the engine, and the throttle position sensor 15 is used to detect whether the throttle 103 is opened or not, and the sensing signal is sent to the electronic control unit 14 .

In step B, after receiving the sensing signal, the electronic control unit 14 performs an action of comparing the temperature and judging whether the accelerator is open, and compares a preset working temperature with the received sensing temperature value as a standard value.

In step C1, if it is found after the comparison that the sensed temperature of the engine is lower than the preset operating temperature and the engine is in an idle state where the accelerator has not been opened, the electronic control unit 14 will select a cold engine state calculation module 141 in the built-in program Perform follow-up calculations. In fact, the operating environment at this time is the so-called cold car stage, that is, the engine temperature is still low when the vehicle is just started.

In step D1, in the case that the electronic control unit 14 selects the cold car state calculation module 141 as the operation basis, if the received engine sensed speed is an idle speed lower than a cold car target speed, the electronic control unit 14 uses the cold car state calculation module 141 as the operating basis. The state calculation module 141 calculates the received sensed temperature and rotational speed to obtain a corresponding opening angle, and sends a control signal to control the auxiliary air intake device 11 to open the angle. After the auxiliary air intake device 11 is turned on, the pure air in the pure air section 1011 enters the mixed oil-air section 1012 through the auxiliary air intake device 11, and the engine speed can be increased due to the increase in air volume. Since the required opening degree can be determined according to various vehicle specifications and performance requirements, it is not a fixed design.

It should be noted that if the electronic control unit controls the auxiliary air intake device by sending a trigger signal to open the valve, that is, the auxiliary air intake device is normally closed as in this embodiment, it is designed so that the engine senses that the rotational speed is zero. does not trigger. Conversely, if the electronic control unit controls the auxiliary air intake device by sending a trigger signal to close the valve, that is, the auxiliary air intake device is normally open, it is designed to be triggered when the engine senses that the rotational speed is zero.

Therefore, in the process of the above step A, step B, step C1, and step D1, it is to deal with the problem of insufficient speed-up performance caused by insufficient air intake when the vehicle is cold-started, and thus too long a waiting time to reach the warm-up state. By means of the auxiliary air intake control of the utility model, the speed of the vehicle can be increased to a higher and proper speed, and eventually the proper working temperature of the vehicle can be reached faster.

After the temperature comparison in the above step B, if it is found that the sensed temperature of the engine has reached the working temperature, and the throttle 103 is detected to be in an open state, then as in step C2, the electronic control unit 14 selects another built-in program, that is, warming up the car The state calculation module 142 performs subsequent calculations. Because at this time the state has reached the desired vehicle operating temperature. The operating temperature of the locomotive is generally about 120 to 135°C temperature sensor temperature.

Then in step D2, when the electronic control unit 14 selects the hot vehicle state calculation module 142 as the operation basis, it can control the auxiliary air intake device 11 to open a fixed opening degree according to the sensed temperature and sensed speed, so as to maintain a relatively high temperature. The state of the best air-fuel ratio; or preferably use the oxygen sensor 16 to detect the oxygen content, and the electronic control unit 14 uses the hot vehicle state calculation module 142 for the received sensed temperature, sensed speed, oxygen content information, Even the throttle opening parameters are integrated to calculate whether the air-fuel ratio in the vehicle is too high or too low to more accurately judge whether the air-fuel ratio in the vehicle is too high or too low, and obtain a corresponding opening angle, and control the auxiliary air intake device 11 to open this angle value, so that the air-fuel ratio is closer to the optimum value.

Because the combustion efficiency is poor at low speeds and more stable at high speeds, the fuel supply at low speeds is usually set to make the fuel injector richer, that is, to supply more fuel. Therefore, in the process of the above step A, step B, step C2, and step D2, it can be solved that the vehicle has reached the engine operating temperature in the hot state, and after the transition from the cold car to the hot car state, the combustion is incomplete due to the high concentration of oil and gas, pollution problems. With the auxiliary air intake control of the present invention, the above-mentioned problems can be solved by providing additional air intake in real time and quickly to make the combustion more complete.

In addition, it is preferable to design the program of the electronic control unit 14 so that even if the detected engine temperature has reached the operating temperature, if the accelerator 103 is not opened, the auxiliary air intake device 11 is controlled to be closed (step C4), thereby avoiding unnecessary air feed.

Similarly, in order to avoid unnecessary valve opening action, the program of the electronic control unit 14 can be additionally designed to control the auxiliary air intake device 11 to close (step C3) when the sensed engine speed detected in step A is zero. ).

In addition, refer to FIG. 5 and FIG. 6 at the same time. In the above-mentioned process, there is a special setting when accelerating the accelerator quickly, that is, if the accelerator position sensor 15 senses the instantaneous change of the accelerator position, such as the rapid acceleration of the full throttle or the sudden stop change of the throttle closing, the electronic control unit 14 That is, controlling the auxiliary air intake device 11 to be closed (step E1 and step E2) can avoid low fuel gas concentration and combustion delay due to a sudden increase in air volume, and thus better acceleration.

In the above-mentioned embodiment, after proceeding from step A to step D1, D2, C3, or C4, return to step A to re-monitor the driving environment to respond to changes in driving conditions.

From the above, it can be known that the air intake assist system of the present invention can speed up the warm-up of the car when the car is cold, that is, shorten the warm-up time, quickly reach the appropriate working temperature, and solve the problem of insufficient speed-up; It can quickly reduce the concentration of oil and gas, reduce incomplete combustion, and contribute to the prevention and control of air pollution.

Claims (6)

1. An air intake assist system, characterized in that it comprises: A carburetor comprising a main intake passage, a throttle nozzle, and a throttle, the throttle nozzle and the throttle are both arranged in the main intake passage; and An auxiliary air intake device is connected sideways to the main air intake passage, including an air intake end and an air outlet end, the air intake end is connected before the throttle nozzle, and the air outlet end is connected behind the throttle valve; a temperature sensor for detecting an engine temperature; a rotational speed sensor for detecting an engine rotational speed; an accelerator position sensor for detecting opening and closing of the accelerator; and An electronic control unit, electrically connected to the auxiliary air intake device, the temperature sensor, the speed sensor and the throttle position sensor, for controlling the auxiliary air intake device according to the engine temperature, the opening and closing of the throttle, and the engine speed opening; Wherein, when the engine temperature is lower than a working temperature and is idling, the electronic control unit controls the auxiliary air intake device to open. 2 . The air intake assist system according to claim 1 , wherein the auxiliary air intake device is an electromagnetic pulse auxiliary air intake device for fully open or fully closed operation. 3 . 3. The air intake assist system according to claim 1, characterized in that the auxiliary air intake device is a stepping motor type auxiliary air intake device, which can be opened in various degrees. 4. The air intake assist system according to claim 1, wherein the electronic control unit is set such that when the accelerator position sensor detects a momentary change of the throttle, the electronic control unit controls the auxiliary air intake device to close . 5. The air intake assist system according to claim 1, wherein the electronic control unit controls the auxiliary intake device to close when the engine speed is equal to zero. 6. The air intake assist system according to claim 1, further comprising an oxygen sensor installed on an exhaust pipe and electrically connected to the electronic control unit, the oxygen sensor is used to detect And send a signal of oxygen content to the electronic control unit.

Images