CN203717208U - Injection rail performance testing device of compressed natural gas vehicle - Google Patents

Abstract

The utility model relates to an injection rail performance testing device of a compressed natural gas vehicle. The testing device comprises a high speed data measure and control device, an injection rail driver and an injection rail testing unit, wherein the high speed data measure and control device comprises a communication interface, a direct current voltage adjuster, a signal processing unit, a digital output unit, a digital input unit, an analog output unit and an analog input unit; the injection rail driver comprises an injection rail drive unit, a coil resistance measure unit and a coil voltage/current testing unit; the injection rail testing unit comprises an injection rail, four pressure transmitters, four temperature transmitters and four flowmeters. The injection rail performance testing device can be used for accurately measuring pressure, temperature and flow at each port of the injection rail and realize real-time display of a computer.

Description

Compressed Natural Gas Vehicle Rail Injection Performance Test Device

technical field

The utility model belongs to the technical field of detection, and in particular relates to a performance test device for rail injection of compressed natural gas vehicles.

Background technique

The problem of urban air pollution caused by automobile exhaust is becoming more and more serious. The main source of pollution in the ten most polluted cities in the world is vehicle exhaust. In my country, urban air pollution is very serious, and the exhaust pollution of ordinary gasoline and diesel vehicles accounts for more than 70% of urban air pollution, which is one of the main sources of air pollution. Therefore, advocating and promoting environmentally friendly vehicles is of great significance to protecting the environment, and it is also an important measure to respond to the national "energy saving and emission reduction" policy. In recent years, compressed natural gas (CNG) vehicles have developed rapidly around the world, and have made great progress in popularization, application and demonstration operations. Since natural gas is a clean energy source, compared with gasoline, the exhaust emissions of CNG vehicles contain no lead, basically no sulfur, 97% reduction in carbon monoxide, 72% reduction in hydrocarbons, and 39% reduction in nitrogen oxides; its price is 50% lower than that of gasoline %, the economic and social benefits are huge. At present, there are more than 1.6 million CNG vehicles in the world, and my country is also vigorously promoting them in recent years. Sichuan, Xinjiang, Chongqing, Harbin, Shenzhen, Shanghai, Jilin, Xi'an, Haikou and other provinces and cities have actively formulated preferential policies to support the development of natural gas vehicles .

Correspondingly, the market demand for injection rails as a special component of CNG automobiles is gradually increasing, and the production and sales volumes are increasing at a rate of 4-5 times per year, which is in line with the needs of domestic green environmental protection. It is estimated that in 2020, the number of domestic natural gas vehicles will reach 1 million, and the market demand for injection rails will be even greater at that time. However, in the face of such a large market, there is a lack of performance testing equipment and quality assurance systems for compressed natural gas injection rails, and there is a lack of standard and scientific testing methods and special equipment for testing the flow output characteristics of injection rail nozzles. The power performance and consistency of individual products cannot be guaranteed.

The injection rail is an important part of the CNG vehicle gas control system, and its performance is related to the dynamic performance of the vehicle. The gas control system utilizes the natural gas injection rail to realize the control. The injection rail equipped with a high-speed solenoid valve adopts the pulse width modulation control method, and injects natural gas to the intake pipe of the corresponding cylinder at regular intervals according to the instructions of the electronic control unit. The injected natural gas is mixed with the fresh air entering the engine and enters the cylinder for combustion. Accurate metering of natural gas injection flow under various working conditions is a prerequisite for controlling the engine speed to maintain high precision and high stability throughout the service life. Due to the differences in the machining process of the spray rail nozzles, different nozzles of the same spray rail, or different flow characteristics between nozzles of different spray rails, need to be adjusted before leaving the factory. However, according to the current relevant reports, there are not many devices for rail injection performance testing, which leads to unstable or even non-normal operation of the engine. The utility model is designed in order to make up for the vacancy of the CNG automobile rail injection performance testing device.

Contents of the invention

Aiming at the deficiencies of the prior art, the utility model provides a test device for the rail injection performance of a compressed natural gas vehicle.

In order to solve the above problems, the utility model adopts the following technical means:

The utility model includes a high-speed data measuring and controlling device, a spray rail driver and a spraying rail testing unit, and the high-speed data measuring and controlling device includes a communication interface, a DC voltage regulator, a signal processing unit, a digital output unit, a digital input unit, an analog output unit, and an analog input unit ; The spray rail driver includes a spray rail drive unit, a coil resistance measurement unit and a coil voltage/current test unit; the spray rail test unit includes a spray rail, four pressure transmitters, four temperature transmitters and four flowmeters.

The output end of the communication interface of the high-speed data controller is connected to the signal processing unit input end, the digital output end of the signal processing unit is connected to the digital output unit input signal, and the digital input end of the signal processing unit is connected to the digital input unit signal , the analog output terminal of the signal processing unit is connected to the signal of the analog output unit, the analog input terminal of the signal processing unit is connected to the signal of the analog input unit, and the DC voltage regulator is the signal processing unit, the digital output unit, the digital input unit, the analog output unit and the The analog input unit provides power.

The output end of the digital output unit in the described high-speed data measuring and controlling device is connected with the input end signal of the spray rail driving unit, the output end of the digital output unit is connected with the input end signal of the coil resistance measuring unit, and the output end of the coil resistance measuring unit is It is connected with the input terminal signal of the analog input unit, and the output terminal of the coil voltage/current measurement unit is connected with the input terminal signal of the analog input unit.

The signal input end of the spray rail is connected to the output end of the spray rail drive unit, and the signal output end of the spray rail is connected to the input ends of four pressure transmitters, four temperature transmitters and four flow meters. The output terminals of four pressure transmitters, four temperature transmitters and four flowmeters are connected to the input terminals of the analog input unit.

The beneficial effects of the utility model are:

1. Control the solenoid valve to control the closing or opening of each nozzle of the spray rail;

2. Accurately test the solenoid valve coil resistance and voltage/current performance;

3. By controlling the opening and closing state of the nozzle, the flow test is realized when one outlet is opened and the other three outlets are closed, and the output performance of the nozzle can be accurately measured; when the four outlets are opened at the same time, the flow rate of each outlet is accurately tested, which is used to adjust the four outlets. Consistency of nozzle flow;

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1, the utility model includes three parts: a high-speed data measuring and controlling device 1, a spray rail driver 2, and a spray rail test unit 3.

High-speed data controller includes communication interface 1-1, DC voltage regulator (DC/DC) 1-2, signal processing unit 1-3, digital output unit 1-4, digital input unit 1-5, analog output unit 1- 6. Analog input units 1-7. The output end of the communication interface is connected to the input end of the signal processing unit, the digital output end of the signal processing unit is connected to the input end of the digital output unit, the digital input end of the signal processing unit is connected to the digital input unit signal, and the analog output of the signal processing unit is The terminal is connected to the signal of the analog output unit, and the analog input terminal of the signal processing unit is connected to the signal of the analog input unit. The DC voltage regulator (DC/DC) supplies power to the Signal Processing Unit, Digital Output Unit, Digital Input Unit, Analog Output Unit, and Analog Input Unit.

The spray rail driver includes a spray rail drive unit 2-1, a coil resistance measurement unit 2-2 and a coil voltage/current test unit 2-3. The output end of the digital output unit is connected to the input end signal of the spray rail drive unit, the output end of the digital output unit is connected to the input end signal of the coil resistance measurement unit, the coil resistance measurement unit is connected to the input end signal of the analog input unit, and the coil voltage The output terminal of the current measurement unit is connected to the input terminal of the analog input unit.

The spray rail test unit includes a spray rail 3-1, 4 pressure transmitters 3-2, 4 temperature transmitters 3-3 and 4 flow meters 3-4. The signal input end of the spray rail is connected to the output end of the spray rail drive unit, and the signal output end of the spray rail is connected to the input ends of 4 pressure transmitters, 4 temperature transmitters and 4 flowmeters. Transmitter, 4 temperature transmitters and 4 flowmeter outputs and analog input unit input signal connections.

The test method of the device is as follows:

After the computer gets the control command, the computer sends the control signal to the signal processing unit 1-2 of the high-speed data measuring and controlling device through its own USB interface and the communication interface 1-1 of the high-speed data measuring and controlling device; the signal processing unit converts the signal Create a digital signal that can be recognized by the jet rail driver 2 and send the control signal to the jet rail driver 2 through the digital output unit 1-4; the coil resistance measurement unit 2-2 and the coil voltage/current test unit 2-3 of the jet rail driver 2 After getting the control signal sent by the digital output unit 1-4, it will stimulate it to test the resistance and voltage/current of the high-speed solenoid valve in real time; after the spray rail drive unit 2-1 gets the control signal sent by the digital output unit 1-4 The working status (open or close) of each nozzle of the spray rail 3-1 will be controlled by the high-speed solenoid valve; the coil resistance measurement unit 2-2, the coil voltage/current measurement unit 2-3, the spray rail 3-1 and the pressure reducing regulator The pressure transmitter, temperature transmitter and flowmeter respectively send their measured signals to the analog input unit 1-7 of the high-speed data controller with an analog current signal of 4 ~ 20mA; the analog input unit then sends the signal to The signal processing unit of the high-speed data controller performs processing; the measurement information processed by the signal processing unit is then transmitted to the computer equipped with analysis software through the communication interface and USB of the high-speed data controller to realize the intuitive display and data storage of the data. The analysis software adopts the existing commercial software; besides being able to accept the commands sent by the computer, the high-speed data controller can also accept the commands sent by the digital input unit 1-5 of the data controller and can pass the analog output of the high-speed data controller Units 1-6 simulate the measured analog signal for display.

Claims (1)

1. Compressed natural gas vehicle injection rail performance test device, including high-speed data measurement and controller, injection rail driver and injection rail test unit, characterized in that: high-speed data measurement and control device includes communication interface, DC voltage regulator, signal processing unit, digital output unit , digital input unit, analog output unit, analog input unit; spray rail driver includes spray rail drive unit, coil resistance measurement unit and coil voltage/current test unit; spray rail test unit includes spray rail, four pressure transmitters, four temperature transmitters and four flowmeters; The output end of the communication interface of the high-speed data controller is connected to the signal processing unit input end, the digital output end of the signal processing unit is connected to the digital output unit input signal, and the digital input end of the signal processing unit is connected to the digital input unit signal , the analog output terminal of the signal processing unit is connected to the signal of the analog output unit, the analog input terminal of the signal processing unit is connected to the signal of the analog input unit, and the DC voltage regulator is the signal processing unit, the digital output unit, the digital input unit, the analog output unit and the The analog input unit provides power; The output end of the digital output unit in the described high-speed data measuring and controlling device is connected with the input end signal of the spray rail driving unit, the output end of the digital output unit is connected with the input end signal of the coil resistance measuring unit, and the output end of the coil resistance measuring unit is It is connected with the input terminal signal of the analog input unit, and the output terminal of the coil voltage/current measurement unit is connected with the input terminal signal of the analog input unit; The signal input end of the spray rail is connected to the output end of the spray rail drive unit, and the signal output end of the spray rail is connected to the input ends of four pressure transmitters, four temperature transmitters and four flow meters. The output terminals of four pressure transmitters, four temperature transmitters and four flowmeters are connected to the input terminals of the analog input unit.