CN104088743B - Electronically controlled high-pressure oil pump and detection device and method for reverse connection of its interface - Google Patents

Abstract

The present invention provides a kind of Electrocontrolled high-pressure oil pump and interface thereof to connect anti-detection device and detection method, it is possible to realize detecting whether interface connects instead rapidly and accurately.Described detection method includes: whether the pressure limiting valve of detection common rail pipe is opened, if it is, obtain the dutycycle of fuel gauging unit and the rail pressure of common rail pipe, and judges whether both are directly proportional, if it is, send interface to connect anti-signal.Described detection device includes controller and the acquisition device being connected with its signal, and acquisition device is for obtaining the dutycycle of fuel gauging unit and the rail pressure of common rail pipe, and judges both variation relations；Controller is connected with the pressure limiting valve signal of common rail pipe, and control acquisition device is operated when pressure limiting valve is opened；When acquisition device get dutycycle be directly proportional to rail pressure time, controller sends interface and connects anti-signal.The interface that present invention utilizes Electrocontrolled high-pressure oil pump connects the characteristic that inverse time dutycycle is directly proportional to rail pressure, and it is simple and convenient, and accuracy of detection is high.

Description

Electronically controlled high-pressure oil pump and detection device and method for reverse connection of its interface

technical field

The invention relates to the technical field of diesel engines, in particular to a detection method for reverse connection of an interface of an electronically controlled high-pressure oil pump. The present invention also relates to a detection device using the above detection method, and an electronically controlled high-pressure oil pump with the above detection device.

Background technique

The electronically controlled high-pressure common rail system means that the diesel oil is sucked out from the fuel tank by the gear pump, delivered to the diesel fine filter through the oil-water separator and the gear pump, and then delivered to the common rail pipe through the electronically controlled high-pressure oil pump, and then conveyed by the common rail pipe The entire oil circuit system to the fuel injector, as well as the closed-loop fuel supply system composed of sensors and ECU (Electronic Control Unit), is a fuel supply method that completely separates the generation of injection pressure and the injection process from each other .

The electronically controlled high-pressure common rail system in the prior art mainly includes four parts: electronically controlled high-pressure oil pump, common rail pipe, electronically controlled fuel injector and ECU; among them, the electronically controlled high-pressure oil pump is a plunger pump with electronically controlled inlet cut-off, It mainly includes relief valve, oil quantity metering unit, zero oil quantity hole and plunger pump.

Please refer to FIG. 1 . FIG. 1 is a structural schematic diagram of an oil circuit setting method in which an electronically controlled high-pressure oil pump supplies oil to a common rail pipe in the prior art.

The electronically controlled high-pressure oil pump in the prior art delivers high-pressure oil to the common rail pipe 5', which mainly includes a relief valve 1', an oil volume metering unit 2', a zero oil volume hole 3' and a plunger pump 4', as shown in the figure 1 is shown by the dotted line. The fuel metering unit 2' is an electromagnetic proportional valve, and its control signal is a PWM signal. When the duty cycle becomes smaller and the flow area becomes larger, more fuel will enter the plunger pump 4'; The pump 4' is connected to the common rail pipe 5', and the common rail pipe 5' is connected to the fuel injector. When the fuel injection volume of the fuel injector remains unchanged, the rail pressure of the common rail pipe 5' (that is, the pressure in the common rail pipe 5' The pressure) will increase; on the contrary, when the duty ratio becomes larger, the rail pressure of the common rail tube 5' will decrease.

Specifically, as shown in Figure 1, the direction indicated by the arrow in Figure 1 is the flow direction of the fuel. When the fuel enters from the inlet, due to the throttling effect of the fuel metering unit 2', a part of the oil returns to the fuel through the overflow valve 1'. To the outlet into the fuel tank, part of it continues to move forward; the fuel flowing forward is diverted through the zero oil volume hole 3', and the remaining fuel enters the plunger pump 4', and enters the common rail pipe 5 after being pressurized by the plunger pump 4' ’, and finally ejected through the injector.

Usually, the common rail pipe 5' has a pressure limiting valve 51' to prevent the excessive pressure in the common rail pipe 5' from affecting the stability of the fuel supply system. Under normal circumstances, during start-up, the duty cycle of the oil metering unit 2' changes from small to large, and the rail pressure first rises quickly and then tends to be stable. The duty cycle is inversely proportional to the rail pressure, and the rail pressure can be stabilized at Within a certain range, the pressure limiting valve 51' will not be flushed open.

In actual production, for the convenience of processing and assembly, the interface sizes of the inlet and outlet ports of the electronically controlled high-pressure oil pump are the same, so assembly errors are prone to occur; when assembly errors occur, the rail pressure may rise sharply, thereby opening the pressure limiting valve 51 ', affecting the normal use of the common rail pipe 5' and destroying the stability of the entire oil supply system.

Therefore, how to find another way to design a detection device and detection method for the reverse connection of the interface of the electronically controlled high-pressure fuel pump to detect whether the interface is reversed, thereby correcting the assembly method of the interface in time and improving the reliability of the fuel supply system is a matter for those skilled in the art. Current technical issues that need to be resolved.

Contents of the invention

The purpose of the present invention is to provide a detection method for the reverse connection of the interface of the electronically controlled high-pressure fuel pump, which can quickly and accurately detect whether the interface is reversed, so as to remind the operator to make changes in time, so that the fuel supply system remains stable.

Another object of the present invention is to provide a detection device adopting the above detection method to realize the detection of reverse connection of the interface, which has a simple structure, convenient operation and high detection accuracy.

Another object of the present invention is to provide an electronically controlled high-pressure oil pump including the above detection device, which can detect whether the interface is reversed, so as to adjust the assembly of the interface according to the detection result and avoid damage to the oil pump.

In order to solve the above technical problems, the present invention provides a detection method for reverse connection of the interface of the electronically controlled high-pressure oil pump, which includes the following steps:

11) Detect whether the pressure limiting valve of the common rail pipe is opened, if yes, then perform step 12), if not, then terminate;

12) Obtain the duty cycle of the oil quantity metering unit and the rail pressure of the common rail pipe, and judge whether the two are proportional, and if so, send a signal that the interface is reversed.

Under normal circumstances, the duty cycle of the oil metering unit is inversely proportional to the rail pressure of the common rail pipe, but when the inlet and outlet of the electronically controlled high-pressure oil pump are connected in reverse, the change characteristics of the duty cycle of the oil metering unit and the rail pressure will occur. The change between the two changes in direct proportion; the detection method of the present invention utilizes this characteristic, and judges whether the interface of the oil pump is reversed through the change relationship between the detection duty cycle and the rail pressure. The operation is simple and convenient, and the detection accuracy is relatively high. High, there will be no misjudgment, etc., and the information of reverse connection of the interface can be obtained accurately and timely, so as to correct the assembly state of the interface in time.

Preferably, step 00) is also included before step 11): detecting whether the rail pressure sensor of the common rail pipe is faulty, and if not, performing step 11).

In order to further improve the accuracy of detection, it is possible to first detect whether the rail pressure sensor is faulty, so as to obtain accurate rail pressure changes and avoid misjudgment.

Preferably, said step 12) specifically includes the following steps:

121) Set the duty cycle of the oil quantity metering unit to zero;

122) Detect whether the drop of the rail pressure exceeds a predetermined value, and then restore the duty cycle to a normal value, and if it exceeds the predetermined value, send a signal that the interface is reversed.

You can first set the duty cycle to zero, and then observe the drop of the rail pressure, so as to judge whether the duty cycle is proportional to the rail pressure; using the above method, first fix one variable, and then observe the change of the other variable, which can reduce the Difficulty of detection, simplifies the detection process, and can also improve the accuracy of the detection results; Intuitively and accurately observe the change of rail pressure, so as to quickly and accurately obtain the detection results.

Preferably, the following steps are also included between said step 11) and step 12):

111) Detect the rotational speed and fuel injection volume of the engine;

112) Judging whether the rotational speed and fuel injection quantity of the engine are greater than a certain value and kept stable, if yes, execute step 12), if not, return to execute step 111).

Before performing the detection operation of whether the duty cycle is proportional to the rail pressure, the engine speed and displacement can be detected first, and then the detection is performed when the speed and displacement are high and stable; on the one hand, after the pressure limiting valve is activated There will be fluctuations in the entire oil supply system when flushing, and testing at this time will affect the testing results; on the other hand, when the speed and displacement are high, the value of the rail pressure is relatively large, and its fluctuation is relatively more obvious. Can improve detection precision and accuracy.

The present invention also provides a detection device for the reverse connection of the interface of the electronically controlled high-pressure oil pump, including a controller and an acquisition device connected to the signal, and the acquisition device is used to obtain the duty cycle of the oil quantity metering unit and the rail pressure of the common rail pipe , and judge the change relationship between the two; the controller is connected with the pressure limiting valve signal of the common rail pipe, and controls the acquisition device to work when the pressure limiting valve is opened; when the acquisition device acquires the When the empty ratio is directly proportional to the rail pressure, the controller sends a signal that the interface is reversed.

The detection device of the present invention is provided with an acquisition device and a controller. The acquisition device can obtain the change relationship between the duty ratio and the rail pressure, so that the controller can judge whether the interface is reversed according to the change relationship. The structure of the whole detection device is relatively simple, and the operation It is convenient, and makes full use of the changing relationship between the duty cycle and the rail pressure, and has high detection accuracy.

Preferably, the acquisition device includes a comparator, a duty ratio acquisition unit for acquiring the duty ratio of the oil metering unit, and a rail pressure sensor for detecting rail pressure, and the comparator acquires the duty ratio The duty cycle acquired by the unit is compared with the rail pressure detected by the rail pressure sensor to determine whether the duty cycle is proportional to the rail pressure.

Preferably, the controller is signal-connected with the oil quantity metering unit to control the duty cycle of the oil quantity metering unit; the acquisition device includes a comparator signal-connected with the controller and a device for detecting rail pressure A rail pressure sensor, the comparator pre-stores a predetermined value of the rail pressure drop, and when the comparator receives a signal from the controller with a duty cycle to zero, the detected value of the rail pressure drop is consistent with the predetermined value. Value comparison, so as to determine whether the duty cycle is proportional to the rail pressure according to whether the rail pressure drop exceeds the predetermined value.

The fuel quantity metering unit can be connected with the controller signal, so that the controller can control the duty ratio, and the information of the duty ratio can be directly transmitted to the comparator, without specially setting up a device for detecting the duty ratio, which simplifies the acquisition The structure of the device; more importantly, when the controller controls the duty cycle, the comparator can directly compare the relationship between the rail pressure drop and the predetermined value, so as to obtain the relationship between the duty cycle and the rail pressure, and then The detection efficiency is improved.

Preferably, it also includes a first detection part for detecting the engine speed, the first detection part is connected with the controller signal, and the controller pre-stores the first fixed value of the engine speed; the controller according to the The detection signal of the first detection part judges whether the engine speed is greater than the first fixed value and remains stable, and if so, controls the acquisition device to work.

It is also possible to set a first detection part for detecting the engine speed, so that the controller can grasp the condition of the engine, thereby controlling the acquisition device to work under appropriate conditions, and ensuring the accuracy of the detection results.

Preferably, it also includes a second detection part for detecting the fuel injection quantity of the engine, the second detection part is connected with the controller signal, and the second fixed value of the engine displacement is pre-stored in the controller; the control The device judges whether the fuel injection quantity of the engine is greater than the second fixed value and remains stable according to the detection signal of the second detection part, and if so, controls the acquisition device to work.

A second detection part for detecting the fuel injection quantity of the engine can also be provided, so that the controller can grasp the condition of the engine, thereby controlling the acquisition device to work when the engine remains in a steady state, so as to ensure the accuracy of the detection results.

The present invention also provides an electronically controlled high-pressure oil pump, including a detection device for detecting whether its inlet and outlet are reversed, and the detection device is the detection device described in any one of the above.

Since the electronically controlled high-pressure oil pump of the present invention has the detection device described in any one of the above, the technical effects produced by the detection device described in any of the above are applicable to the electronically controlled high-pressure oil pump of the present invention, and will not be repeated here. .

Description of drawings

Fig. 1 is a structural schematic diagram of an oil circuit setting method in which an electronically controlled high-pressure oil pump supplies oil to a common rail pipe in the prior art;

Fig. 2 is a schematic diagram of the fuel supply oil circuit when the interface of the electronically controlled high-pressure oil pump provided by the present invention is reversed;

Fig. 3 is a schematic flow chart of a specific embodiment of the detection method for reverse connection of the interface of the electronically controlled high-pressure oil pump provided by the present invention.

In Figure 1:

1' overflow valve, 2' oil quantity metering unit, 3' zero oil quantity hole, 4' plunger pump, 5' common rail pipe, 51' pressure limiting valve

In Figure 2-3:

1 Relief valve, 2 Oil quantity metering unit, 3 Zero oil quantity hole, 4 Plunger pump, 5 Common rail pipe, 51 Pressure limiting valve

detailed description

The core of the present invention is to provide a detection method for the reversed connection of the interface of the electronically controlled high-pressure fuel pump, which can quickly and accurately detect whether the interface is reversed, so as to remind the operator to make changes in time, so that the fuel supply system remains stable.

Another core of the present invention is to provide a detection device adopting the above detection method to realize the detection of reverse connection of the interface, which has a simple structure, convenient operation and high detection accuracy.

Another core of the present invention is to provide an electronically controlled high-pressure oil pump including the above detection device, which can detect whether its interface is reversed, so as to adjust the assembly of the interface according to the detection result and avoid damage to the oil pump.

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Please refer to FIG. 2 . FIG. 2 is a schematic diagram of the fuel supply circuit when the interface of the electronically controlled high-pressure fuel pump provided by the present invention is reversed.

The electronically controlled high-pressure oil pump of the present invention includes a detection device for detecting whether the connection of the interface is reversed, so as to detect whether the connection of its inlet and outlet is reversed. Specifically, the electronically controlled high-pressure oil pump usually includes a relief valve 1, an oil volume metering unit 2, a zero oil volume hole 3, and a plunger pump 4. The oil outlet of the plunger pump 4 is connected with a common rail pipe 5, so that the common rail The pipe 5 transports fuel oil outward; the fuel quantity metering unit 2 is used to control the fuel quantity entering the plunger pump 4; the overflow valve 1 is opened after the pressure rises to a certain value, and is used for pressure relief to reduce the pressure in the pipeline; When fuel supply is not required, the fuel metering unit 2 cannot be completely closed due to its own structural limitations. At this time, the fuel can be divided through the zero fuel hole 3 to minimize the fuel entering the plunger pump 4 .

As mentioned in the background art, in actual production, for the convenience of processing and assembly, the interface sizes of the inlet and outlet ports of the electronically controlled high-pressure oil pump are the same, so assembly errors are prone to occur. As shown in Figure 2, the direction of the arrow in Figure 2 indicates the flow direction of the fuel. If the inlet and outlet of the electronically controlled high-pressure fuel pump are reversed, the fuel enters from the zero oil volume hole 3 and is divided by the fuel volume metering unit 2, and part of it passes through The outlet flows back to the fuel tank, and part of it enters the plunger pump 4; at this time, the duty ratio of the oil metering unit 2 becomes smaller, the flow area becomes larger, and more oil returns to the fuel tank through the oil metering unit 2, and then enters the plunger pump 4. The fuel of the plunger pump 4 becomes less, which in turn leads to less fuel delivered from the plunger pump 4 to the common rail pipe 5, and the rail pressure of the common rail pipe 5 becomes smaller; on the contrary, when the duty cycle of the fuel metering unit 2 becomes larger , the rail pressure increases.

Therefore, in the case of reverse connection of the interface, during the startup process, the duty cycle changes from small to large, and the rail pressure changes from small to large. When the rail pressure rises to a certain level, the pressure limiting valve 51 in the common rail pipe 5 will be flushed open. ; After the pressure limiting valve 51 is opened, the duty ratio changes in direct proportion to the rail pressure.

Those skilled in the art should be able to understand that when the rail pressure continues to rise, there is a greater potential safety hazard, affecting the stability of the fuel supply oil circuit, and further affecting the normal use of the engine. Therefore, in actual use, it is best to avoid the reverse connection of the oil inlet and outlet as much as possible, and adjust the assembly relationship of the interface in time when the connection of the interface is reversed, so as to maintain the stability of the fuel supply system.

Since the interface size of the inlet and outlet is the same, it is not easy to detect when the interface is reversed, and it is not easy to produce obvious effects in a short time. Therefore, in practice, the engine failure is often caused by the reverse connection of the interface; and there are many reasons for engine failure. When performing fault diagnosis, it is necessary to check one by one, which seriously affects the normal use of the engine.

The present invention aims at the above technical problems, discovers the relationship between the duty ratio and the rail pressure when the interface is reversed, and uses this relationship to detect the reversed connection of the interface, so as to detect the reversed connection of the interface in time and avoid affecting the fuel supply due to interface errors The normal operation of the system, thereby reducing the failure rate of the engine.

Please refer further to FIG. 3 . FIG. 3 is a schematic flowchart of a method for detecting reverse connection of an interface of an electronically controlled high-pressure oil pump provided by the present invention in a specific embodiment.

The invention provides a detection method for reverse connection of the interface of an electronically controlled high-pressure oil pump, which includes the following steps:

S11: Detect whether the rail pressure sensor is faulty, if not, execute step S12, if yes, return to the beginning step and start again;

S12: Detect whether the pressure limiting valve 51 of the common rail pipe 5 is flushed, or whether the pressure limiting valve 51 is opened, if yes, then execute step S13, if not, then terminate;

S13: Detect the rotational speed and fuel injection quantity of the engine;

S14: Determine whether the speed and fuel injection volume are greater than a certain value and remain stable, if yes, execute step S15, if not, return to step S13 until the above conditions are met, that is, the engine speed and fuel injection volume are both greater than a certain value and remain stable;

S15: set the duty cycle of the fuel quantity metering unit 2 to zero;

S16: Detect whether the rail pressure drop of the common rail pipe 5 exceeds a predetermined value, if yes, execute step S17, if not, execute step S18;

S17: restore the duty cycle to the normal value, and send a signal that the interface is reversed;

S18: restore the duty ratio to a normal value, and send a signal that the interface is normal.

It can be seen that the present invention adopts the method described in steps S15-S17. First, the duty ratio is set to zero, and then the drop of the common rail tube 5 is detected to determine whether the duty ratio is proportional to the rail pressure, and finally whether the interface is reversed. the result of. Normally, when the electronically controlled high-pressure oil pump is started, the duty cycle of the oil quantity metering unit 2 will gradually increase, that is to say, the value of the duty cycle is usually far greater than zero; Therefore, when the duty cycle is set to zero in step S15, the duty cycle decreases greatly, and correspondingly, the rail pressure changes greatly, and the rail pressure change can be detected more intuitively at this time , to avoid misjudgment. Furthermore, when the duty cycle reaches zero, it is equivalent to fixing the value of the duty cycle. At this time, it is only necessary to detect the variation of the rail pressure, which simplifies the detection steps and improves the detection efficiency and accuracy.

It can be understood that the above steps S15-S17 are only a way of judging whether the duty cycle is proportional to the rail pressure, and the detection method of the present invention is not limited to the detection of whether the duty cycle is proportional to the rail pressure using the above-mentioned specific implementation. For example, the duty cycle can be controlled to rise and fall within a certain range, and then the change of the corresponding rail pressure at this time can be detected, and whether the two are proportional can be judged by comparing the duty cycle and the rise and fall of the rail pressure. Alternatively, it is possible to detect the change of the duty cycle within a period of time, and then detect the change of the rail pressure within this period of time, and then compare the change rules of the two, so as to judge the corresponding relationship between the duty cycle and the rail pressure.

That is to say, any method of obtaining the duty cycle and rail pressure and judging whether the two are proportional to whether the interface is reversed according to the relationship between the two belongs to the protection scope of the detection method of the present invention and is not limited to the above steps Specific forms described in S15-S17.

It can also be understood that during specific execution, step S11 can be omitted, and step S12 can be directly performed. Since the failure rate of the rail pressure sensor is generally low, the probability of detection result errors caused by a rail pressure sensor failure is low. Therefore, it is also possible to There is no need to detect whether the rail pressure sensor is faulty, thereby simplifying the detection steps and improving the detection efficiency.

Obviously, in step S11, if it is detected that the rail pressure sensor is faulty, the detection program can also be terminated, so that the rail pressure sensor can be repaired and other operations, and then the detection process can be restarted; only when the rail pressure sensor is not faulty, the step is executed S12, there are various ways to deal with the failure of the rail pressure sensor, which is not limited in the detection method of the present invention.

It can be further understood that steps S13 and S14 can also be omitted, and step S15 is directly executed when step S12 is executed and it is detected that the duty cycle is proportional to the rail pressure. In the case of reverse connection of the interface, the process of increasing the duty cycle will inevitably lead to a large increase in rail pressure, thereby opening the pressure limiting valve 51, so when the connection is reversed, the pressure limiting valve 51 must be in the open state, but the pressure limiting valve There are many factors for 51 to open, not limited to the reverse connection of the interface. Therefore, in step S12, the opening state of the pressure-limiting valve 51 can be detected first, and subsequent detection is performed only when the pressure-limiting valve 51 is opened; otherwise, the detection procedure can be directly terminated to simplify the detection steps and improve detection efficiency.

After step S12 is executed, when it is detected that the pressure limiting valve 51 is opened, it can be directly detected whether the duty cycle is proportional to the rail pressure to judge whether the interface is reversed. When it is detected that the duty cycle is proportional to the rail pressure, an interface connection reverse signal. The specific method for detecting whether the duty ratio is directly proportional to the rail pressure can be steps S15-S17, or other methods, as described above.

Furthermore, since the oil supply system fluctuates to a certain extent after the pressure limiting valve 51 is opened, if step S15 is directly executed at this time, a misjudgment may occur, so the engine speed and fuel injection volume can be detected, and when both are greater than a certain When the value remains stable, it indicates that the oil supply system is relatively stable, and at this time, performing step S15 and subsequent steps can obtain more accurate detection results. That is to say, the setting of steps S13 and S14 can improve the accuracy of the detection result. On the other hand, in step S14, it is required that the engine speed and fuel injection volume must be greater than a certain value. At this time, the corresponding rail pressure is relatively high. Normal use of the engine to reduce the impact of the detection process on the engine. When detecting whether the rotational speed of the engine and the fuel injection quantity are greater than a certain value in step S14, the determination of the certain value can refer to the above-mentioned factors, that is, the certain value should be relatively large, and it can meet the requirements that will not affect the normal use of the engine during the detection process. greater impact.

In detail, in step S16, the predetermined value can be calibrated according to the actual situation, for example, the predetermined value can be set between 50-100bar, so that the drop of the rail pressure can be clearly observed, and at the same time, it will not affect the normal operation of the engine. Use has a noticeable effect.

The detection method of the present invention can also omit step S18, as long as the signal that the interface is reversed can be obtained, and no signal needs to be generated when the interface is normal, that is, the present invention does not limit the processing situation where the duty cycle is not proportional to the rail pressure .

In addition, in steps S17 and S18, since the duty ratio is set to zero in step S15, no matter how the rail pressure changes in the subsequent detection, the duty ratio needs to be restored to a normal value to avoid engine failure. Obviously, when other methods are used to detect whether the duty cycle is directly proportional to the rail pressure, if there is no case of reducing the duty cycle to zero, that is, if the duty cycle is always within the range of normal values, there is no need to restore the duty cycle to normal value. The normal value refers to the value within the variation range of the duty ratio during the normal use of the engine, please refer to the prior art for details.

It should be noted that the drop of the rail pressure can be a positive value or a negative value. When the interface is reversed and the duty cycle is set to zero, the rail pressure will drop, and the drop is of course a positive value. ; When the interface is normal, set the duty cycle to zero. Since the duty cycle is inversely proportional to the rail pressure at this time, the drop of the rail pressure is a negative value, that is, the rail pressure rises. Therefore, if the predetermined value is a positive value, it will obviously not exceed the predetermined value when the drop amount is a negative value, so it can be judged that the interface is in a normal assembly state.

The present invention also provides a detection device for the reverse connection of the interface of the electronically controlled high-pressure oil pump, which includes a controller and an acquisition device connected to the signal. pressure, and judge the change relationship between the two; the controller is connected with the pressure limiting valve signal of the common rail pipe, and controls the acquisition device to work when the pressure limiting valve is opened; when the acquisition device acquires the When the duty cycle is proportional to the rail voltage, the controller sends a signal that the interface is reversed.

The detection device of the present invention firstly controls the pressure limiting valve through the controller, and only controls the acquisition device to work when the pressure limiting valve is in an open state, so as to improve the detection efficiency and simplify the detection process; then use the acquisition device to obtain the ratio of duty ratio and rail pressure Change the relationship to judge whether the duty cycle is proportional to the rail pressure, so that the controller sends a signal that the interface is reversed when the duty cycle is proportional to the rail pressure. It can be seen that the detection device of the present invention is simple in structure and convenient in operation, and utilizes the relationship between the duty ratio and the rail pressure to detect and judge whether the interface is reversed, thereby improving the accuracy of the detection results, and can quickly and accurately obtain the interface reverse connection. signal to adjust the fit of the interface based on that signal.

More specifically, the acquisition device may include a comparator, a duty ratio acquisition unit for acquiring the duty ratio of the oil quantity metering unit, and a rail pressure sensor for detecting rail pressure; the comparator and the duty cycle The signal connection of the duty ratio acquisition unit is connected with the rail pressure sensor signal at the same time, so that the duty ratio obtained by the duty ratio acquisition unit is compared with the rail pressure detected by the rail pressure sensor, thereby judging the difference between the duty ratio and the rail pressure sensor. Whether the rail pressure is proportional.

As described in the above detection method, the comparator can obtain the value of the duty ratio within a period of time, and then compare the change of the duty ratio within the period; at the same time, judge the rail pressure within the period according to the rail pressure detected by the rail pressure sensor Finally, according to the change of duty cycle and rail pressure, it is judged whether the two are proportional.

Or, in another more specific implementation manner, the controller can be connected with the oil quantity metering unit for signal connection, thereby controlling the duty cycle of the oil quantity metering unit; the acquisition device can include a comparator and a rail for detecting the rail pressure The pressure sensor, the rail pressure sensor is connected with the comparator signal, so that the rail pressure detected by it is transmitted to the comparator for processing; the comparator is connected with the controller signal, and the controller can transmit the information of the duty ratio to the comparator, and The comparator pre-stores a predetermined value of rail pressure drop. The controller can set the duty cycle to zero under certain conditions. Compared with the predetermined value, it is judged whether the detection value exceeds the predetermined value, and thus judges whether the duty cycle is proportional to the rail pressure.

When the controller is connected to the signal of the fuel quantity metering unit, the acquisition device can obtain the duty ratio without setting up a special duty ratio acquisition unit, and the controller can directly send the duty ratio information to the comparator; at the same time, the comparator can also There is no need to compare the duty cycle, the controller directly controls the duty cycle to zero to minimize it, then it can only obtain the drop amount of the rail pressure, and then judge whether the drop amount exceeds the predetermined value, and then obtain the duty cycle and Whether the rail pressure is proportional.

That is to say, at this time, the structure of the acquisition device can be simplified, and the processing process of the comparator can also be simplified, thereby improving the detection efficiency.

Further, there are various types of acquisition devices. It is possible to set a detection piece that detects the duty cycle and the rail pressure respectively, and then compare the detection results of the two detection pieces to determine whether the duty cycle is proportional to the rail pressure; or it can be set It is a detection piece used to detect the duty cycle and the variation of rail pressure, and then directly compare the relationship between the variation of the two over a period of time.

The detection device of the present invention may also include a first detection part for detecting the engine speed, the first detection part is connected with the controller signal, and the controller pre-stores the first fixed value of the engine speed; the first detection The component transmits the detected rotation speed to the controller, and the controller compares the detection value of the rotation speed with the first fixed value to judge whether it is greater than the first fixed value, and judges whether the rotation speed of the engine at this time is maintained according to the detection value of the rotation speed within a period of time. Stable, if and only when the rotational speed of the engine is greater than the first fixed value and remains stable, the controller controls the obtaining device to work.

Further, it may also include a second detection part for detecting the fuel injection quantity of the engine, the second detection part is connected with the controller signal, and the second detection part is pre-stored with the second fixed value of the engine displacement; the second detection The component sends the detection value of the fuel injection quantity of the engine to the controller, and the controller compares the detection value with the second fixed value, and judges whether it is stable according to the detection value of the fuel injection quantity within a period of time. Only when the fuel injection quantity of the engine is greater than When the second constant value remains stable, the controller controls the acquiring device to work.

When the first detection part and/or the second detection part are provided, the controller can monitor the running state of the engine in real time, so as to control the acquisition device to work in a relatively stable state of the engine, so as to avoid other unstable factors of the engine from affecting the detection results. influence, improve detection accuracy, and avoid misjudgment.

Preferably, the present invention can also include an alarm, and the alarm is connected to the controller signal, so that when the controller sends a signal that the interface is reversed, it controls the alarm to send an alarm signal to warn the staff that there is an error in the interface and correct it in time. Assembly error of the interface.

The alarm can be an audible alarm or a photoelectric alarm, and can also be an audible and visual alarm to send out alarm signals such as an alarm sound or an alarm signal light.

The predetermined value described herein can be defined with reference to the definition of the predetermined value in the detection method above; the first fixed value and the second fixed value can be determined according to the certain value in the detection method that the engine speed and the fuel injection quantity are greater than a certain value. The value is set and will not be repeated here.

In addition, the order words such as first and second mentioned in this article are only for distinguishing different structural components, and do not indicate a specific order; the signal connection mentioned in this article refers to the realization of signal transmission in a wired or wireless way. a connection method.

Due to space limitation, the present invention only explains part of the structure of the electronically controlled high-pressure oil pump. Please refer to the prior art for the structure of other parts, and will not repeat them here.

The electronically controlled high-pressure oil pump provided by the present invention and the detection device and detection method for reverse connection of the interface have been introduced above in detail. In this paper, specific examples are used to illustrate the principles and implementation modes of the present invention, and the descriptions of the above embodiments are only used to help understand the core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (8)

1. an Electrocontrolled high-pressure oil pump interface connects anti-detection method, it is characterised in that include Following steps:

11) whether the pressure limiting valve of detection common rail pipe is opened, if it is, perform step 12), If it is not, then terminate；

12) obtain the dutycycle of fuel gauging unit and the rail pressure of common rail pipe, and judge that both are No it is directly proportional, if it is, send interface to connect anti-signal；

Described step 12) specifically include following steps:

121) by the dutycycle of fuel gauging unit to zero；

122) whether the slippage detecting described rail pressure exceeds predetermined value, then by described duty Than recovering to normal value, if beyond predetermined value, then sending interface and connect anti-signal.

2. detection method as claimed in claim 1, it is characterised in that in described step 11) The most also include step 00): the rail pressure sensor whether fault of detection common rail pipe, if it does not, Then perform step 11).

3. detection method as claimed in claim 1 or 2, it is characterised in that in described step Rapid 11) and step 12) between further comprising the steps of:

111) rotating speed and the distributive value of electromotor are detected；

112) judge that rotating speed and the distributive value of electromotor are the most stable more than certain value and holding, as Fruit is, then perform step 12), perform step 111 if it is not, then return).

4. an Electrocontrolled high-pressure oil pump interface connects anti-detection device, it is characterised in that include Controller and the acquisition device being connected with its signal, described acquisition device is used for obtaining fuel gauging The dutycycle of unit and the rail pressure of common rail pipe, and judge both variation relations；Described controller It is connected with the pressure limiting valve signal of common rail pipe, and controls described acquisition dress when described pressure limiting valve is opened Put and be operated；When described acquisition device get described dutycycle be directly proportional to described rail pressure time, Described controller sends interface and connects anti-signal；

Described controller is connected with described fuel gauging cell signal, to control described fuel gauging The dutycycle of unit；Described acquisition device include the comparator that is connected with described controller signals with And for detecting the rail pressure sensor of rail pressure, described comparator prestores the predetermined of rail pressure drop amount Value, when described comparator receives dutycycle that described controller sends to zero-signal, to rail pressure Whether the detected value of slippage compares with described predetermined value, in order to surpass according to described rail pressure drop amount Go out described predetermined value and judge whether dutycycle is directly proportional to rail pressure.

Detect device the most as claimed in claim 4, it is characterised in that described acquisition device Including comparator, for obtain the dutycycle of fuel gauging unit dutycycle acquiring unit and For detecting the rail pressure sensor of rail pressure, described dutycycle acquiring unit is obtained by described comparator Dutycycle and described rail pressure sensor detection rail pressure compare, to judge dutycycle and rail Whether pressure is directly proportional.

6. the detection device as described in claim 4 or 5, it is characterised in that also include using In the first detection piece of detection engine speed, described first detection piece and described controller signals Connecting, described controller prestores the first definite value of engine speed；Described controller is according to institute The detection signal stating the first detection piece judges that whether engine speed is more than described first definite value and guarantor Keep steady fixed, be operated if it is, control described acquisition device.

7. the detection device as described in claim 4 or 5, it is characterised in that also include using In the second detection piece of detection Engine Injection Mass, described second detection piece is believed with described controller Number connect, described controller prestores the second definite value of engine displacement；Described controller according to The detection signal of described second detection piece judges that whether Engine Injection Mass is more than described second definite value And keep stable, it is operated if it is, control described acquisition device.

8. an Electrocontrolled high-pressure oil pump, including for detecting whether its inlet and outlet connects anti- Detection device, it is characterised in that described detection device is any one of the claims 4-7 institute The detection device stated.