DE102016213415A1 - DEVICE FOR DETERMINING AN ANOMALY IN A PRESSURE-DRIVEN FLUID FEEDING SYSTEM AND METHOD THEREFOR - Google Patents

Abstract

The present disclosure provides an apparatus 102 for determining an abnormality in a pressurized fluid delivery system 100 of a vehicle. An injector 114 is in fluid communication with a pump 104 through a supply path 112. The pump 104 delivers fluid from a tank 106 to the injector 114. The apparatus 102 is configured to drive the injector 114 with at least one duty cycle, a speed of To change pump 104 to at least two different speed values, to monitor a pressure gradient in the feed path 112 corresponding to the at least two different speed values, and based on the pressure gradient corresponding to the two different speed values, the anomaly of the injector 114 and / or the To determine pump 104. The device 102 also adapts to the anomaly of the injector 114 and improves the function.

Description

The following description describes and determines the nature of this invention and the manner in which it should be practiced.

Field of the invention:

The present disclosure relates to an apparatus and method for determining anomaly in a pressurized fluid delivery system, and further relates to the detection of and adaptation to a particular anomaly for an injector and / or pump. More particularly, the present disclosure relates to determining the anomaly of an injector or pump in a fuel injection system or in a selective catalytic reduction (SCR) system of a vehicle.

General state of the art:

According to patent literature US 20100114455 comprises a process for checking the functionality of a metering valve of a reducing agent system of an internal combustion engine, wherein the metering device is advanced by means of a controllable pump with a constant pressure from a tank to the metering valve, that the metering valve is influenced by a control variable which causes a change of state of the Dosing valve, a variable is detected, which identifies the flow rate of the pump, and from this variable, which indicates the flow rate, is based on the functionality of the metering valve.

To ensure the desired mass flow rate, a system pressure is kept constant and the metering valve is opened for a certain time. The calculation of the opening time is based on the metering valve characteristics. The metering valve properties have manufacturing tolerances and aging effects. Due to aging and tolerances, the software calculated opening time can not ensure a desired mass flow rate. In order to ensure an accurate mass flow rate, it is necessary to recognize and adapt new metering valve properties after aging and other anomalies.

Brief description of the accompanying drawings:

An embodiment of the invention will be described with reference to the following accompanying drawings.

1 13 illustrates an apparatus for determining anomaly in a pressurized fluid delivery system of a vehicle according to an embodiment of the present disclosure;

2 FIG. 12 illustrates a method for determining anomaly in a pressurized fluid delivery system of the vehicle according to an embodiment of the present disclosure; and FIG

3 FIG. 12 illustrates a graph illustrating a variation in the pressure gradient used to determine the anomaly in a pressurized fluid delivery system of a vehicle according to an embodiment of the present disclosure. FIG.

Detailed description of the embodiments:

1 FIG. 10 illustrates an apparatus for determining anomaly in a pressurized fluid delivery system of a vehicle according to an embodiment of the present disclosure. FIG. It is a block diagram of the system 100 shown. A pump 104 , also referred to as a supply module, supplies a fluid from a tank 106 to a feed path 112 , which is also known as a pressure line. An injector 114 the fluid injects into the pressurized fluid delivery system based on the application 100 one. The pump 104 is continuously / periodically / timely operated at a desired speed to ensure that a system pressure in the supply path 112 remains constant. A pressure sensor 110 is at the supply path 112 connected to measure the system pressure and the controller or device 102 to provide a signal.

The device 102 is a controller or electronic control unit (ECU) having at least one input means and at least one output means and other components known in the art. Alternatively, it is a dedicated device 102 or an ECU provided to the anomaly of the injector 114 or the existing ECUs are designed to determine the anomaly. If a dedicated device 102 is provided, the device communicates 102 with other ECUs such as a pump controller, an engine controller, an injector controller and the like of the pressurized fluid supply system 100 to the anomaly of the injector 114 and / or the pump 104 to determine.

The pump 104 will be with a like through the device 102 signaled desired speed operated. The device 102 calculates the desired speed based on the pressure sensor 110 measured System pressure. The system pressure corresponds to the pressure of the fluid in the supply path 112 , If a piston-based pump 104 is used, a duty cycle / duration of the pump 104 controlled accordingly. The injector 114 is through the device 102 operated with a desired duty cycle. Similar to the case of the pump 104 calculates the device 102 also the desired duty cycle of the injector 114 based on the system pressure and the desired mass flow rate. Alternatively, in a memory, that of the device 102 is pre-stored, a relationship between the desired mass flow rate and the desired duty cycle, which is used for all calculations.

As in 1 Shown is a reflux module 108 or a throttle valve is provided. The mass flow rate through the reflux module 108 depends on the system pressure. If no mass flow requirement from the injector 114 is present, the pump 104 operated to the system pressure in the supply path 112 maintain. The return line ensures that the fluid passing through the pump 104 is delivered to the tank 106 is returned to maintain system pressure.

If, on the basis of the engine conditions, it is necessary for a certain amount of the fluid to be in an injection range 116 is injected, the device calculates 102 based on the system pressure and the desired injection quantity of the fluid, the opening time of the injection nozzle 114 , As a result of opening of the injector 114 the system pressure drops / decreases in the supply path 112 and the speed of the pump 104 is through the device 102 increased to maintain system pressure.

In one embodiment of the present disclosure, the injector is located 114 through the supply path 112 in fluid communication with the pump 104 , The pressure of the feed path 112 is done with the help of the pressure sensor 110 detected and monitored. The pump 104 delivers fluid from the tank 106 to the injector 114 , The device 102 is designed to be the injector 114 with at least one duty cycle, a speed of the pump 104 to change at least two different values, a pressure gradient in the feed path 112 corresponding to the at least two different values of the speed, and an anomaly of the injector based on the pressure gradient corresponding to the two different values of the speed 114 and / or the pump 104 to determine.

The pressurized fluid delivery system 100 is at least one selected from a fuel injection system, an exhaust treatment system, and the like. The fluid is selected from a group including gasoline, diesel, flex-fuel, compressed natural gas (CNG), pipe gas (PNG), diesel exhaust fluid (DEF), and the like. The injector 114 is selected from a group including an electromagnetic / electromechanical injector, a piezoelectric injector, an electrospray injector, a mechanical valve connected to a nozzle that operates in response to a certain pressure, and the like. Further, the pump is selected from a group including, but not limited to, a solenoid pump, a linear motion pump, a rotary pump, a vane pump, a positive displacement pump, a gear pump, a servo pump, or other fluid delivery device.

The device 102 operates the pump 104 and the injector 114 in at least two states, ie, two different speeds of the pump 104 , and with at least one operating cycle of the injection nozzle 114 , In each state, the duty cycle of the injector remains 114 same and the only change is a different speed of the pump 104 , In an alternative embodiment, a same speed of the pump 104 considered and the injector 114 operated with at least two different duty cycles and a corresponding pressure gradient is monitored to determine the anomaly.

The device 102 monitors the change in the pressure gradient in the feed path 112 , A change in system pressure in the feed path 112 is an integral of the mass flow rate through the pump 104 minus the mass flow rate from the return line and the mass flow rate of the injector 114 , The mass flow rate of the pump 104 depends in addition to the speed and the volumetric properties of the pump 104 from the pressure in the supply path 112 from. Similarly, a mass flow rate of the injector depends 114 and the reflux module 108 besides the respective opening time and the volumetric characteristics of the pressure in the supply path 112 from. The mass flow rate is measured in milligrams per second or any other unit of skill.

The device 102 calculated on the basis of a system pressure generated by the pressure sensor 110 is detected, and the opening time based on the volumetric properties of the injection nozzle 114 a desired mass flow rate of fluid entering the injection area 116 to be injected. Alternatively, the device calculates 102 based on system pressure generated by the pressure sensor 110 and at least one engine operating condition, a desired mass flow rate of fluid entering the injection region 116 to be injected. On the basis of the required desired mass flow of the fluid, the opening time of the injector 114 depending on the volumetric properties of the injector 114 and the pressure passing through the pressure sensor 110 is detected, calculated. The device 102 begins the examination / diagnosis of the system 100 by operating the pump 104 and the injector 114 each having at least one control parameter value and storing the results / information of the test / diagnosis in the memory element (not shown). The control parameter for the injector 114 is considered the duty cycle, and that for the pump 104 is the speed, but there is no limit to it. The device 102 accesses the storage element and monitors the pressure drop due to the anomaly of the injector 114 and / or the pump 104 changed when the supply path 112 by operating at a different rate of pump speeds 104 and a different duty cycle of the injector 114 , is exposed to a change in system pressure. The device 102 compares the rate of change of pressure (the pressure gradient) of the feed path 112 , which operates on two different sets of parameters, and determines the anomaly parameter of the injector 114 ,

The anomaly parameter / factor for each of the pump 104 and the injector 114 is determined. The anomaly parameter of the pump 104 and the injector 114 is due to aging and manufacturing tolerances and deterioration due to continued use and other emerging defects. The anomaly is only for the injector 114 or only for the pump 104 or jointly determined for both.

In one embodiment of the present disclosure, the device conforms 102 to the specific anomaly of the injector 114 and / or the pump 104 and corrects the amount of fluid entering the injection area 116 to be injected. The particular anomaly is a value that the device 102 on at least one of a control parameter of the injection nozzle 114 and / or the pump 104 applies. The device 102 Determines the anomaly while driving without normal operation of the injector 114 and / or the pump 104 to interrupt. Alternatively, the device determines 102 the anomaly by operating the system 100 in a test mode or an anomaly detection mode, interrupting the normal operation of the system.

When the device 102 is used for a fuel injection system, the tank stores 106 the fuel and deliver the pump 104 the fuel from the tank 106 through the injector to the combustion chamber or intake manifold of an engine. The injection area 116 corresponds to the combustion chamber or the intake manifold. Further, the pump 104 a low pressure pump or a high pressure pump.

When the device 102 is used for an exhaust treatment system, the tank 106 used to store the diesel exhaust fluid (DEF) or reducing agent. The pump called the supply module 104 delivers the DEF through a dosing module or a reducing agent injection valve to the exhaust pipe, which serves as the injection area 116 acts.

According to another embodiment of the present disclosure, the device determines 102 an anomaly parameter of the pump 104 and fits the control parameter of the pump 104 to ensure their proper functioning. The device 102 determines the anomaly parameter of the injector 114 and adapts to the control parameter of the injector 114 to ensure their optimal function. Thus, an adaptation to any malfunction or any defect of the injector 114 or the pump 104 and a corresponding operation by the device 102 , The device 102 corrects the error and operates the pump 104 and the injector 114 such that a normal function is fulfilled.

In one embodiment of the present disclosure, the system is 100 with the device 102 to determine the anomaly of the injector 114 Mistake. Alternatively, the system 100 with the device 102 for determining the anomaly of the pump 104 Mistake. In yet another alternative is the system 100 with the device 102 for determining the anomaly of the pump 104 as well as the injector 114 Mistake.

2 FIG. 10 illustrates a method for determining an anomaly in a pressurized fluid delivery system of a vehicle according to an embodiment of the present disclosure. The injector 114 stands by the supply path 112 in fluid communication with the pump 104 , where the pump 104 Fluid from the tank 106 to the injector 114 supplies. The method includes the step 202 driving of the injector 114 with at least one work cycle. The injector 114 is operated at a fixed / constant duty cycle by the device 102 is designed or calculated based on the requirements. The next step 204 involves changing the speed of the pump 104 to at least two different values. Under Reference to the specified duty cycle of the injector 114 operates the device 102 the pump 104 at two different speeds. The next step 206 includes monitoring a pressure gradient in the feed path 112 that corresponds to the at least two different speed values. The step 208 includes determining the anomaly of the injector 114 and / or the pump 104 based on the fluctuation in the pressure gradient, which corresponds to the at least two different speed values.

The injector 114 is selected from a group including an electromagnetic injector, a piezoelectric injector, and the like. The anomaly of the injector 114 is detected and made an adjustment to correct the amount of fluid to be injected. After determining the anomaly parameter, the device corrects 102 the particular component, ie, the pump 104 or the injector 114 , This may adapt to any failure or malfunction of the pump 104 or the injector 114 be made over time. The device 102 regulates the corresponding control parameter, ie, the speed of the pump 104 and the duty cycle of the injector 114 , based on the determined anomaly parameter. The anomaly is determined while driving, without normal operation on at least one of the injector 114 and the pump 104 to interrupt. The pressure sensor 110 Helps to detect pressures during diagnosis.

3 FIG. 12 illustrates a graph illustrating a pressure differential variation used to determine anomaly in a pressurized fluid delivery system of a vehicle according to an embodiment of the present disclosure. FIG. That as in 2 Illustrated method is described with the help of the diagram in 3 is explained in detail. In the diagram represents the X-axis 302 represents the time and represents the Y-axis 304 It is assumed that a respective unit for both axes is known to a person skilled in the art. At the beginning puts the device 102 the speed of the pump 104 to a constant value n ₁ (such as rpm). The device 102 then sets a constant / fixed duty cycle of d [%] for the injector 114 firmly. When the device 102 the system 100 based on the specified speed of the pump 104 and the specified duty cycle of the injector 114 operates, the pressure of the fluid reaches in the supply path 112 an equilibrium state or the desired system pressure. With reference to 3 refers to the initial reference point 306 to a state of balance. The pressure rises in the supply path 112 on when the pump 104 and the injector 114 operated at the speed and duty cycle that have been set. The reference point 308 represents an end value or equilibrium value upon reaching the set pressure in the supply path 112 dar. The reference point 308 differs for different operating conditions of the pump 104 and the injector 114 ,

During the process of reaching the equilibrium state, ie, in a dynamic / transient operating state, the device stores 102 the values for the pressure and the time from the reference point 306 to 308 in the memory element. The stored values represent the curve 312 The device 102 also selects a particular reference point on the curve using the stored values for the pressure and time in the memory element 312 , where the pressure gradient is close to zero, ie just before the equilibrium state, as the reference point 310 referred to as. The device 102 calculates the slope of the curve 312 by selecting at least two reference points of interest (shown in dashed lines) between 306 and 310 and processes the respective values for the pressure and the time. The reference point 310 is chosen so as to ensure that the device 102 the at least two points of interest for each out of the bend 312 (and the later mentioned curve 314 ) between the reference points 306 and 310 chooses. The device 102 is preconfigured to be the reference point of interest based on 306 and one from the reference points 308 and 310 to choose. The points of interest are determined based on the properties of the pump and / or injector, which also vary based on speed, type, size, and the like.

The process explained above is for a different curve 314 which is a result of the operation of the pump 104 with a different speed n ₂ , repeated. The pressure rises in the supply path 112 on when the pump 104 operated at the different speed and the injector 114 with the same duty cycle d [%] as the first curve 312 is operated. The curve 314 also includes a reference point 308 as the final value or equilibrium value indicating the achievement of the system pressure. Similar to the calculation for the curve 312 is through the device 102 also a slope for the curve 314 calculated. The device 102 then calculates based on the monitored pressure gradient due to the at least two different speeds of the pump 104 and the at least one operating cycle of the injection nozzle 114 the anomaly parameter.

After definition of anomaly of an injector 114 and the pump 104 is the device 102 designed to be the injector 114 and / or the pump 104 selectively adjust to correct the injection amount of the fluid.

According to one embodiment of the present disclosure, the device 102 also an actuation signal for determining the anomalies in the pressurized fluid delivery system 100 controlled. The device 102 is configured to begin the determination of the anomaly periodically or based on the distance the vehicle has traveled and the like. Alternatively, the device 102 be instructed by an operator to begin the diagnostics.

According to one embodiment of the present disclosure, after detecting the anomaly of the injector 114 and adjusting to achieve a desired mass flow rate with optimum spray quality. The injector 114 Depending on the application, it is also referred to as a dosing valve or other terminology. The device 102 allows diagnosis and correction of injector anomalies 114 in the vehicle, without having to visit a repair shop, thus saving labor, time and costs associated therewith. The device 102 detects anomalies in the mass flow rate of the pump 104 , the mass flow rate of the injector 114 and corrects them. The device 102 adapts to the aging and the manufacturing / manufacturing tolerance of components that alter the volumetric properties of the system 100 cause, before. The spray quality through the injector 114 is improved, whereupon the injection of the required mass flow rate through the injection nozzle 114 without any deviation follows. The device 102 is able to measure the anomaly of at least one component of a system 100 , which is a pressurized supply of a fluid from a tank 106 to an injection nozzle 114 includes to determine. Thus, the device is also applicable to the dosing of chemicals / medicaments in other industries such as pharmaceuticals and the like. It should be understood that embodiments explained in the above description are merely illustrative and not limiting of the scope of this invention. Many such embodiments and other variations and modifications to the embodiment explained in the description are conceivable. The scope of the invention is limited only by the scope of the claims.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 20100114455 [0003]

Claims (10)

Contraption ( 102 ) for determining an anomaly in a pressurized fluid delivery system ( 100 ) of a vehicle that has a pump ( 104 ) in a flow connection through a feed path ( 112 ) with an injection nozzle ( 114 ), wherein the pump ( 104 ) a fluid from a tank ( 106 ) to the injection nozzle ( 114 ), the device ( 102 ) is designed: the injection nozzle ( 114 ) with at least one working cycle, the speed of the pump ( 104 ) to at least two different values, a pressure gradient in the feed path ( 112 ), which corresponds to the at least two different speed values, and to monitor the anomaly of the injection nozzle ( 114 ) and / or the pump ( 104 ) based on the pressure gradient corresponding to the at least two different velocity values. Contraption ( 102 ) according to claim 1, wherein the pressurized fluid supply system ( 100 ) is at least one selected from a fuel injection system, an exhaust treatment system and the like. Contraption ( 102 ) according to claim 1, wherein the fluid is selected from a group comprising diesel exhaust fluid (DEF), gasoline, diesel, flex-fuel, compressed natural gas (CNG), tubular gas (PNG) and the like. Contraption ( 102 ) according to claim 1, wherein the injection nozzle ( 114 ) is selected from a group including an electromagnetic injector, a piezoelectric injector and the like. Contraption ( 102 ) according to claim 1, wherein an adaptation to the particular anomaly of the injection nozzle ( 114 ) and / or the pump ( 104 ) and the amount of fluid to be injected is corrected. Contraption ( 102 ) according to claim 1, wherein the anomaly during driving without interrupting a normal operation of the injection nozzle ( 114 ) and / or the pump ( 104 ) is determined. Method for determining anomaly in a pressurized fluid delivery system ( 100 ) of a vehicle that has a pump ( 104 ) in a flow connection through a feed path ( 112 ) with an injection nozzle ( 114 ), wherein the pump ( 104 ) a fluid from a tank ( 106 ) to the injection nozzle ( 114 ), the method comprising the steps of: operating the injection nozzle ( 114 ) with at least one working cycle, changing the speed of the pump ( 104 to at least two different values, monitoring a pressure gradient in the feed path (FIG. 112 ) corresponding to the at least two different velocity values, and determining the anomaly of the injection nozzle ( 114 ) and / or the pump ( 104 ) based on the pressure gradient corresponding to the at least two different speed values. Method according to claim 7, wherein the injection nozzle ( 114 ) is selected from a group including an electromagnetic injector, a piezoelectric injector and the like. Method according to claim 7, wherein the anomaly of the injection nozzle ( 114 ) and an adjustment is made to correct the amount of fluid to be injected. Method according to claim 7, wherein the anomaly is determined during the journey without the normal operation of the injection nozzle ( 114 ) and / or the pump ( 104 ) to interrupt.

Images