CN202789270U - Portable common-rail pressure gauge - Google Patents

Abstract

The utility model relates to a portable common-rail pressure gauge including a measuring indicating unit and a connecting wire harness. The innovation of the pressure gauge lies in that the pressure gauge can be directly connected when a common-rail system is under on/off state to carry out pressure measurement, and can communicate with an upper computer through a RS232 serial communication interface. A high-pressure low-threshold warning lamp and a system setting button are arranged on the front panel of the measuring indicating unit. The high-pressure low-threshold warning lamp employs flickery red and yellow LED for indication, and the flicker frequency can be adjusted through the setting button. Sensors of other types can be measured by changing the input and output connectors of the connecting wire harness and carrying out calibration setting on the system. The pressure gauge can conveniently measure and monitor common-rail pressure on site, and is simple in structure, convenient for use, and low in cost.

Description

Portable common rail pressure measuring device

technical field

The utility model relates to pressure measurement of a common rail system, including a measurement display unit and a connecting wire harness, which can be directly connected to a measuring device for common rail pressure measurement in both working and non-working states of the common rail system, and can communicate with a host through an RS232 serial communication interface. It is a device that can conveniently measure and monitor the common rail pressure on site. the

Background technique

With the improvement of internal combustion engine emission regulations, the market application of electronically controlled common rail fuel injection systems is becoming more and more extensive. For electronically controlled common rail fuel injection systems, the common rail pressure is one of the most important monitoring parameters of the system. For an engine equipped with an electronically controlled common rail fuel injection system, when the engine fails to start or its performance is abnormal, a large part of the failure is caused by the common rail pressure control, such as the pressure cannot be established, the pressure control fluctuates abnormally, etc. Therefore, the common rail Pressure is one of the most critical monitoring parameters in system maintenance. the

At present, the maintenance tools for electronically controlled common rail fuel injection systems on the market mainly rely on professional diagnostic instruments or notebooks. Although the special diagnostic instrument can monitor a large amount of system information and is very convenient to use, it is expensive, usually 10,000 to tens of thousands Between, and requires the operator to have a certain technical foundation, the professional diagnostic instrument is mainly aimed at high-end users or designated 4S service stations of enterprises; the notebook mode diagnosis needs to be used in conjunction with professional diagnostic software, and the system data monitoring and analysis is carried out through computer communication. The special diagnostic software of the method is also aimed at professional technical users, and has higher requirements on the quality of the operators, and the continuous working time of the battery power supply is limited during the notebook on-board diagnosis, making it impossible to perform long-term diagnosis and monitoring. the

In the domestic engine fuel system maintenance market, in addition to dedicated high-end users or 4S service stations designated by enterprises, there are also a large number of small and medium-sized individual industrial and commercial households. Diagnostic tools and personal experience, therefore, more convenient and affordable diagnostic testing tools are needed for fault analysis and troubleshooting of electronically controlled common rail fuel injection systems. This utility model is proposed for such a market application background. the

Contents of the invention

The purpose of this utility model is to propose a portable common rail pressure measuring device, which does not cause any damage to electrical circuits, and can be directly connected to the measuring device for common rail pressure measurement in the working and non-working states of the common rail system, providing a fast and effective The tool is used to detect the pressure of the common rail system, so as to quickly detect and troubleshoot on-site faults. the

To achieve this purpose, the technical solution of the utility model is to provide a portable common rail pressure measuring device, which consists of a measurement display unit and a connecting harness, which can be directly connected to the measuring device in the working and non-working states of the electronically controlled common rail fuel injection system Common rail pressure measurement is different from the prior art. The advantages and positive effects of the utility model in application are as follows:

1. The utility model includes a measurement display unit and a connecting wire harness. The connecting wire harness includes an input joint, an output joint, a measurement display unit joint and wire components, wherein the input joint is connected with the common rail pressure sensor, and the output joint is connected with the system wire harness. The display unit connector is docked with the measurement display unit. the

2. The front panel of the measurement display unit is equipped with high pressure and low limit alarm lights and system setting buttons. The high pressure and low limit alarm lights are red and yellow light-emitting diodes; the high pressure and low limit alarms adopt the LED frequency flashing method, The flashing frequency can be adjusted by the setting button. the

3. The rear panel of the measurement display unit is equipped with an RS232 serial communication interface, which is used for communication between the portable common rail pressure measurement device and the computer for dynamic collection and storage of measurement data. the

The portable common rail pressure measurement device described in the utility model is composed of a measurement display unit and a connecting wire harness. It has the characteristics of simple structure, convenient use, and low cost. It can be directly connected and measured in the working and non-working states of the electronically controlled common rail fuel injection system. The device measures the common rail pressure, providing a fast and effective tool for on-site detection of the common rail pressure, so that fault detection and troubleshooting can be carried out quickly. the

The embodiments of the present utility model are described in further detail below in conjunction with the accompanying drawings, in order to analyze the application characteristics and advantages of the technical solution. Meanwhile, the following embodiments are descriptive and not restrictive. Protection scope of utility model. the

Description of drawings

Fig. 1 is a functional block diagram of the utility model system;

Fig. 2 is a schematic diagram of connection of wire parts of the present utility model;

Fig. 3 is a structural schematic diagram of the measurement display unit of the present utility model;

Fig. 4 is a structural diagram of the front panel of the present utility model;

Fig. 5 is a structure diagram of the rear panel of the utility model. the

Detailed ways

The working principle, specific structure and preferred embodiments of the portable common rail pressure measuring device of the present invention will be described in detail below in conjunction with the accompanying drawings. the

FIG. 1 is a functional block diagram of the system of the utility model, which is composed of a measurement display unit 50 and a connecting wire harness 60 . Wherein the measurement display unit 50 is used for the acquisition and dynamic display processing of the measured pressure signal; the connection harness 60 includes an input joint 10, an output joint 20, a measurement display unit joint 30 and a wire part 40, wherein the input joint 10 is connected to the measured common rail pressure The sensor, that is, the input connector 10 is customized according to the measured common rail pressure sensor connector; the output connector 20 is connected to the system harness, that is, the output connector 20 is customized according to the system harness connector; the measurement display unit connector 30 is connected to the corresponding connector of the measurement display unit 50. the

When measuring the common rail pressure of the electronically controlled common rail fuel injection system, disconnect the connector of the common rail pressure sensor from the system wiring harness, and use the input connector 10 and output connector 20 of the measurement device to connect them in series to the system, that is, the input The connector 10 is connected to the connector of the tested common rail pressure sensor, and the output connector 20 is connected to the corresponding plug-in of the system wiring harness, so as to ensure that the state of the original system does not change. The common rail pressure signal of the electronically controlled common rail fuel injection system passes through the measurement display unit 50 Direct display, convenient and quick to use. the

Fig. 2 is the connection schematic diagram of wire part of the present utility model, and wire part 40 comprises wire 31, 32 and 33 to form, and their definition is power supply, signal and ground wire respectively, and wherein signal output is voltage type, and the corresponding order of each wire is determined by concrete sensor Determined by the characteristics, the signal of the joint 30 of the measurement display unit is obtained by connecting the corresponding wires of the common rail pressure sensor in parallel. For the convenience of description, it is assumed that wires 31, 32, and 33 correspond to power, signal, and ground respectively. If the definition of the wires is inconsistent with the above, it is only necessary to adjust the corresponding jacks of the input connector 10, output connector 20, and measurement display unit connector 30. The location is enough, and the principle of the system does not change in any way. Therefore, this description is only based on the fact that wires 31, 32, and 33 correspond to power, signal, and ground wires, respectively. the

Fig. 3 is a structural schematic diagram of the measurement display unit of the utility model, which is mainly composed of a rectification processing circuit, a dry battery pack, a single-chip microcomputer system, a serial port processing circuit, and an RS232 serial communication interface 220. The rectification processing circuit completes the processing from AC 220V to the +5V power supply system required by the single-chip microcomputer in the AC input power supply mode, which meets the working requirements of the single-chip microcomputer system; the dry battery pack uses +9V power supply, which improves the energy storage capacity of the system and is processed by the circuit as + The 5V power supply system meets the working requirements of the single-chip microcomputer system. The positive output terminal of the dry battery pack power supply is connected to the switch 41 and the diode 42, and the diode 42 is used to prevent the battery pack from being charged when the switch is turned on and the AC power supply is adopted, thereby causing damage to the dry battery pack. 1, 2, 3, 4, 5, and 6 are system input and output interface terminals, of which terminals 1, 2, and 3 form the output interface, which can be directly connected to multimeters or oscilloscopes and other equipment for signal measurement and analysis, and terminals 4, 5, and 6 are composed of The input interface is docked with the connector 30 of the measurement display unit, where terminal 4 is the ground wire, terminal 5 is the output signal of the common rail pressure sensor, and terminal 6 is the power supply of the common rail pressure sensor. In terms of electrical characteristics, terminals 1 and 4, terminal 2 and 5, terminals 3 and 6 are connected respectively. the

Fig. 4 is a structural diagram of the front panel of the utility model, which is composed of a light emitting diode (Light Emitting Diode) display area 170, a setting button and a limit alarm light, wherein the light emitting diode display area 170 is used for displaying measurement information and setting information. The limit value alarm light is divided into high limit value alarm light and low limit value alarm light, among which 120 is the high limit value alarm light, and the limit threshold is set by the setting button. When the measured common rail pressure value exceeds the high limit value, the high limit value The limit alarm light 120 starts to flash and alarm, that is, the red light-emitting diode flashes to give an alarm prompt, wherein the flash frequency can be adjusted by setting the button. When the measured common rail pressure value does not exceed the high limit, the high limit alarm light 120 goes out. 110 is a low limit alarm light, and the limit threshold is set by the setting button. When the measured common rail pressure value does not exceed the low limit, the low limit alarm light 110 starts to flash and alarm, that is, the yellow light-emitting diode flashes to give an alarm prompt. The frequency can be adjusted through the setting button, and when the measured common rail pressure exceeds the lower limit, the lower limit alarm light 110 goes out. the

Using different colors for the high and low limit alarm lights can effectively prevent information confusion in practical applications. The information of high and low limit value is confused, so as to give misleading information, and the alarm light adopts flashing mode to prompt, which enhances the warning effect of information alarm. Because the maintenance site environment is noisy, it can effectively overcome the disadvantage of poor sound alarm effect. the

There are four setting buttons, which are 130, 140, 150, and 160 respectively. Among them, the setting button 160 is used for system function setting, and the system enters the setting state by pressing 160; the setting button 150 is used for function selection. After entering the setting state, sensor calibration, High limit value setting, low limit value setting, high limit value alarm light frequency setting, low limit value alarm light frequency setting and other functions, the setting button 150 is used to switch between different functions; the setting button 140 is used to turn up the value, press once The set value is increased by 1; the setting button 130 is used to scroll down the value, and the set value is decremented by 1 when pressed once, and the value is automatically saved in the non-volatile memory of the single-chip system after being changed, and these set data will not be lost after power off . the

Fig. 5 is the structural diagram of the rear panel of the utility model, wherein 200 is an AC voltage input interface; 41 is a switch, which is used to disconnect and connect the positive pole power supply signal of the battery pack; 220 is a serial communication interface, through which the interface communicates with the upper computer software Communication, the real-time measurement value of the common rail pressure can be collected to the computer for display, storage and analysis; 230 is the cover of the dry battery pack, and the dry battery pack is placed inside; , 3 correspond to; 250 is the input interface, three of which correspond to 4, 5, 6 in Fig. 3 respectively. the

The above is the specific implementation of the present utility model. There can be multiple modifications and changes within the scope of the present utility model and the claims. , and set the system calibration through the setting button, then other types of sensor signals can be measured. Therefore, the described embodiments do not limit the protection scope of the claims of the present utility model. the

Claims (6)

1. portable common rail pressure measuring device, comprise and measure display unit and rat tail, it is characterized in that, measuring the display unit joint docks with the measurement display unit, rat tail comprises input adapter, out splice going splice, measurement display unit joint and wire guiding member, wherein input adapter docks with common rail pressure sensor, and out splice going splice docks with the system wire harness.

2. portable common rail pressure measuring device according to claim 1 is characterized in that, measures the display unit power supply for dry battery and exchanges the input dual mode.

3. portable common rail pressure measuring device according to claim 1 is characterized in that, the positive source output loop of measuring display unit dry battery power supply mode has switch and unilateral diode.

4. portable common rail pressure measuring device according to claim 1 is characterized in that, the high and low limit value warning light of pressure is set measurement display unit front panel and system arranges button.

5. portable common rail pressure measuring device according to claim 4 is characterized in that, measures the high and low limit value warning of pressure of display unit front panel and adopts light emitting diode frequency scintillation mode, and flicker frequency can be by arranging the button adjustment.

6. portable common rail pressure measuring device according to claim 1 is characterized in that, measures the display unit rear board RS232 serial communication interface is set.

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