CN107420211B - Control method and system for position type electric control distribution pump - Google Patents
Control method and system for position type electric control distribution pump Download PDFInfo
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- CN107420211B CN107420211B CN201710841982.0A CN201710841982A CN107420211B CN 107420211 B CN107420211 B CN 107420211B CN 201710841982 A CN201710841982 A CN 201710841982A CN 107420211 B CN107420211 B CN 107420211B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/3082—Control of electrical fuel pumps
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Abstract
The invention discloses a control method and a system for a position type electric control distribution pump, wherein the method comprises the following steps: an intelligent control module is integrated on the oil injection pump, and the intelligent control module can store basic MAP of each oil injection pump, such as a rotating speed, an oil amount and an oil amount slip ring position relation table, so that the consistency of the oil amount is guaranteed. The intelligent control module is integrated with the position type electric control distribution pump, is buried in the oil quantity actuator, receives an oil quantity position signal and an oil injection advance angle signal sent by the ECU through a bus, and controls the oil quantity actuator and the timing electromagnetic valve. The method can greatly reduce the probability of faults on the wire harness, improve the reliability of the system and solve the technical problems of inconsistent oil quantity and advance angle of the oil injection pump caused by manufacturing and processing errors of the existing position type electric control distribution pump.
Description
Technical Field
The invention relates to a control method and a control system of a position type electric control distribution pump.
Background
With the promotion of national energy conservation and emission reduction regulations, a fuel system serving as a core part of a diesel engine is also upgraded all the time, for example, an electric control fuel system is more and more widely applied to a diesel engine. The present electric control distribution pump fuel system is a scheme for solving the problem of diesel engine discharge upgrading, and mainly comprises a position control type electric control distribution pump system, and the core of the position control type electric control distribution pump system is a position control type electric control distribution pump, an engine control module (ECU) and a fuel injector. However, the existing position-type electronic control fuel system has some risks in terms of product consistency and system reliability, especially in application environments such as off-road and the like which have severe requirements on reliability.
The existing position type electric control distribution pump mainly comprises an oil injection quantity regulating mechanism, an oil injection timing regulating mechanism, an oil pumping component, a distribution component (plunger) and the like, and an electric control distribution pump fuel system is formed by the electric control distribution pump fuel system, an ECU, an oil injector and related sensors. With the upgrading of emission regulations, the requirement on the production consistency of the fuel injection pump is higher and higher. The traditional position type electric control dispensing pump cannot ensure the consistency of oil quantity at each rotating speed due to the processing dispersion of mechanical parts. In addition, because the ECU is connected with the electric control distribution pump through a long-distance engine or whole vehicle wiring harness, the reliability problem of poor contact or circuit burnout of connectors on the wiring harnesses often occurs in practical use.
The position type electric control distribution pump is mainly used in diesel engine, and it, engine Control Unit (ECU) and oil sprayer constitute fuel oil system, and is responsible for sucking diesel oil from low-pressure oil circuit and spraying it to combustion chamber for combustion. The existing solution at home and abroad is as follows: the electronic oil quantity regulating module is integrated on the pump, and the module drives a sliding sleeve on a plunger piston so as to control the size of the injected oil quantity.
The main deficiency of the current electric control fuel oil system is that the fuel injection quantity of each pump at the same rotating speed and the same sliding ring position cannot be kept consistent due to the dispersion problem of mechanical manufacturing and electrical parts, so that the dispersion of the power and torque of the engine is caused, and the requirements of gradually improved national regulations on emission and product consistency cannot be met. For example, when under certain conditions, the fuel system is ready to inject 10cc of fuel. Because the fuel injection quantity is related to the rotating speed and the position of the fuel slip ring, the ECU can drive the fuel actuator on the fuel injection pump to rotate to a position of 23%. However, the key problem is that the oil injection amount at the same rotation speed and oil mass slip ring position is different between different oil injection pumps due to the dispersion of machining mechanical parts of each factory position oil injection pump, for example, 10 ± 1cc is corresponding to 23% of the position.
In the existing position type electric control distribution pump control system scheme, sensor signals related to a whole vehicle/whole machine, an engine and an oil injection pump system are all input to a unique Engine Control Unit (ECU), and the ECU controls all actuators at different parts of the whole vehicle/whole machine. Taking the control of the fuel injection amount as an example, the realization path is described. The ECU calculates the target fuel injection quantity according to the received signals of the engine, the rotating speed and the like; and then the ECU calculates the position of the target oil mass slip ring by looking up a table according to the values of the rotating speed and the injected oil mass, and finally realizes oil mass control by driving an oil mass regulator on the oil injection pump. As shown in fig. 2. Because in the actual use in order to simple to operate, ECU and injection pump are not the complete set use. Therefore, the relationship between the rotational speed SP, the injected fuel quantity Q and the fuel slip ring position S in fig. 2 is taken as the fuel injection pump data in the intermediate state or the average state, which is only data in the sense of an average value. Therefore, when different ECUs are matched with different fuel injection pumps, the phenomenon of inconsistent fuel quantity occurs.
In addition, stability of the system is a problem. Because the position type electronic control distribution pump is provided with an oil quantity position signal, an oil injection advance angle signal, an oil quantity actuator drive, a timing electromagnetic valve drive and the like, the signals are more, and under the condition that the distance between the ECU and the oil injection pump is longer and the number of connectors in the middle is larger, the condition of poor contact between the ECU and the oil injection pump is easy to occur under severe environments, particularly under the conditions of non-road and other temperatures and larger vibration, and the severe consequences such as engine shutdown are caused.
Disclosure of Invention
Aiming at the technical problems, the invention provides a control method and a control system for a position type electric control distribution pump, which can solve the problems of consistency of pump oil quantity and advance angle, greatly reduce the probability of faults on a wire harness and improve the reliability of the system.
In order to achieve the technical purpose, the invention adopts the following specific technical scheme:
a control method for a position type electric control distribution pump is based on the arrangement of two independent control modules, namely a first control module arranged on an engine and a second control module arranged on an oil injection pump, and comprises the following steps:
s1, the first control module collects current engine rotating speed electric signals and vehicle signals to calculate a target fuel injection quantity value, a target fuel injection advance angle value, an expected state signal value of an oil inlet electromagnetic valve of a fuel injection pump and an engine rotating speed signal value, and transmits the four calculated signal values to a second control module;
s2, the second control module performs the following three actions according to the four signal values transmitted by the first control module, wherein the actions are as follows:
adjusting the fuel injection quantity: the second control module calculates the position of a target oil mass slip ring according to an engine rotating speed signal value and a target oil injection quantity value transmitted by the first control module and a temperature signal collected by a fuel oil temperature sensor on the self-injection pump, and then calculates the obtained position of the target oil mass slip ring and a signal of an oil mass slip ring position sensor on the self-injection pump together to obtain a proper driving current so as to drive an oil mass regulator on the oil injection pump to enable the oil mass regulator to reach the position of the target oil mass slip ring;
adjusting the fuel injection advance angle: the second control module combines a timing stroke sensor signal received from the oil injection pump according to a target oil injection advance angle signal transmitted from the first control module, obtains a proper driving current through calculation, and drives the timing electromagnetic valve to enable the oil injection advance angle to reach a target position;
controlling an oil inlet electromagnetic valve: the second control module receives the expected state signal value of the fuel feeding electromagnetic valve of the fuel injection pump transmitted from the first control module and then drives the fuel feeding electromagnetic valve of the fuel injection pump to be opened or closed.
In step S1, the vehicle signal includes: an accelerator pedal signal, an intake pressure temperature signal, an engine coolant temperature signal, a vehicle speed signal, a key switch signal and a brake switch signal.
In the step S2, a PID control algorithm is adopted when an oil quantity regulator on the oil injection pump is driven.
In step S2, a PID control algorithm is adopted when the timing electromagnetic valve is driven to inject oil.
A control system for a position type electric control distribution pump comprises an engine, an oil injection pump, a first control module, a second control module, a fuel oil temperature sensor, an oil quantity adjusting module, a timing electromagnetic valve, an oil inlet electromagnetic valve, an oil quantity slip ring position sensor and a timing stroke sensor, wherein the timing stroke sensor is connected with the oil inlet electromagnetic valve,
the first control module is arranged on the engine and used for acquiring current engine rotating speed electric signals and vehicle signals to calculate a target fuel injection quantity value, a target fuel injection advance angle value, an expected state signal value of an oil feeding electromagnetic valve of a fuel injection pump and an engine rotating speed signal value and transmitting the calculated four signal values to the second control module;
the fuel temperature sensor is arranged on the fuel injection pump and used for detecting a fuel temperature signal value on the fuel injection pump;
the oil mass slip ring position sensor is used for detecting to obtain an oil mass slip ring position feedback signal and feeding the oil mass slip ring position feedback signal back to the second control module;
the timing stroke sensor is used for detecting a timing stroke feedback signal of an oil injection advance angle position and feeding the timing stroke feedback signal back to the second control module;
the second control module is arranged on the fuel injection pump, receives an engine rotating speed signal value and a target fuel injection quantity value which are transmitted by the first control module and is combined with a temperature signal of the fuel temperature sensor to calculate a target fuel quantity slip ring position, combines the obtained target fuel quantity slip ring position with the fuel quantity slip ring position feedback signal to obtain a proper driving current through calculation, and then drives the fuel quantity adjusting module on the fuel injection pump to enable the fuel quantity adjusting module to reach the target fuel quantity slip ring position;
after receiving the oil injection advance angle value of the target collected by the first control module, calculating appropriate driving current by combining with the received timing travel feedback signal, and driving a timing electromagnetic valve to enable the oil injection advance angle to reach the target position;
and after receiving the expected state signal value of the oil feeding electromagnetic valve of the oil injection pump acquired by the first control module, driving the oil feeding electromagnetic valve of the oil injection pump to be opened or closed.
The first control module is an ECU (electronic control unit), the second control module is a PCU (Power control Unit), and the ECU and the PCU are communicated through a CAN (controller area network) bus; PCU directly places in the oil mass adjusting module of injection pump, and with the oil mass position feedback sensor and the temperature sensor integration of oil mass adjusting module in an organic whole, cools off through the fuel in the injection pump.
And a three-proofing adhesive coating covers the exterior of the PCU.
The invention has the beneficial effects that:
compared with the existing position type electric control dispensing pump, the invention has the following advantages:
firstly, because the intelligent module (PCU) is installed on the fuel injection pump, and the intelligent module contains a memory, each fuel injection pump can store the individualized fuel quantity and the fuel injection advance angle data of the fuel injection pump on the fuel injection pump for the ECU to read. Thereby solving the problems of consistency of oil pumping quantity and advance angle.
Secondly, because the intelligent object is on the injection pump, it can directly link to each other with the electrical component on the pump directly, and the circuit between with ECU only has power and communication line, has significantly reduced the probability of trouble on the pencil, has improved the reliability of system.
Drawings
FIG. 1 is a functional block diagram of the system of the present invention;
FIG. 2 is a diagram of the oil volume implementation path of the present invention;
FIG. 3 is a schematic diagram of a system control scheme of the present invention;
FIG. 4 is a diagram of a fuel injection amount adjustment process;
fig. 5 is a diagram illustrating a process of adjusting the fuel injection advance angle.
Detailed Description
The technical solution of the control system for a position-type electronically controlled dispensing pump according to the present invention will be described in further detail with reference to the drawings and the specific embodiments.
As described in relation to figure 1 of the drawings,
as shown in fig. 1, the present invention discloses a control method for an electronically controlled position dispensing pump by separating the control of the fuel pump system from the ECU and attaching it to the fuel pump as a separate control module (PCU). Namely, a sensor and an actuator on the fuel injection pump are directly connected with the PCU, and the PCU is communicated with the original ECU through a bus.
When each pump leaves the factory, the basic oil quantity MAP with the relation of oil quantity, rotating speed, fuel oil temperature and fuel injection quantity is solidified in the PCU to become the special oil quantity basic MAP. Because of the memory on the PCU, a dedicated fuel quantity basis MAP (i.e., a table of fuel quantity Q, speed SP, fuel temperature T and fuel quantity slip ring position S) can be stored on the PCU on the pump for each fuel injection pump. In this case, the fuel injection amount of the system is realized by the path shown in fig. 2.
The specific technical scheme is as follows:
as shown in fig. 3 to 5, a control method for a position-type electronically controlled dispensing pump is based on the arrangement of two independent control modules, namely a first control module arranged on an engine and a second control module arranged on an injection pump, and comprises the following steps:
s1, the first control module collects current engine rotating speed electric signals and vehicle signals to calculate a target fuel injection quantity value, a target fuel injection advance angle value, an expected state signal value of an oil inlet electromagnetic valve of a fuel injection pump and an engine rotating speed signal value, and transmits the four calculated signal values to a second control module;
step S2, the second control module performs the following three actions according to the four signal values transmitted by the first control module, wherein the actions are as follows:
adjusting the fuel injection quantity: the second control module calculates the position of a target oil mass slip ring according to an engine rotating speed signal value and a target oil injection quantity value transmitted by the first control module and a temperature signal collected by a fuel oil temperature sensor on the self-injection pump, and then calculates the obtained position of the target oil mass slip ring and a signal of an oil mass slip ring position sensor on the self-injection pump together to obtain a proper driving current so as to drive an oil mass regulator on the oil injection pump to enable the oil mass regulator to reach the position of the target oil mass slip ring;
adjusting the advance angle of oil injection: the second control module combines a timing stroke sensor signal received from the oil injection pump according to a target oil injection advance angle signal transmitted from the first control module, obtains a proper driving current through calculation, and drives the timing electromagnetic valve to enable the oil injection advance angle to reach a target position;
controlling an oil inlet electromagnetic valve: the second control module receives the expected state signal value of the fuel feeding electromagnetic valve of the fuel injection pump transmitted from the first control module and then drives the fuel feeding electromagnetic valve of the fuel injection pump to be opened or closed.
Further, as a preferred scheme of the method of the present invention, in step S1, the vehicle signal includes: an accelerator pedal signal, an intake pressure temperature signal, an engine coolant temperature signal, a vehicle speed signal, a key switch signal and a brake switch signal.
Further, as a preferred scheme of the method of the present invention, in step S2, a PID control algorithm is adopted when driving the oil amount regulator on the injection pump.
Further, as a preferable scheme of the method of the invention, in the step S2, a PID control algorithm is adopted when the timing solenoid valve is driven to inject oil.
The invention also discloses a control system for the position type electric control distribution pump, which comprises an engine, an oil injection pump, a first control module, a second control module, a fuel oil temperature sensor, an oil quantity adjusting module, a timing electromagnetic valve, an oil inlet electromagnetic valve, an oil quantity slip ring position sensor and a timing stroke sensor, wherein,
the first control module is arranged on the engine and used for acquiring current engine rotating speed electric signals and vehicle signals to calculate a target fuel injection quantity value, a target fuel injection advance angle value, an expected state signal value of an oil feeding electromagnetic valve of a fuel injection pump and an engine rotating speed signal value and transmitting the calculated four signal values to the second control module;
the fuel temperature sensor is arranged on the fuel injection pump and used for detecting a fuel temperature signal value on the fuel injection pump;
the oil mass slip ring position sensor is used for detecting to obtain an oil mass slip ring position feedback signal and feeding the oil mass slip ring position feedback signal back to the second control module;
the timing stroke sensor is used for detecting a timing stroke feedback signal of an oil injection advance angle position and feeding the timing stroke feedback signal back to the second control module;
the second control module is arranged on the fuel injection pump, receives an engine rotating speed signal value and a target fuel injection quantity value transmitted by the first control module and combines a temperature signal of the fuel temperature sensor to calculate a target fuel quantity slip ring position, then combines the obtained target fuel quantity slip ring position with the fuel quantity slip ring position feedback signal to obtain a proper driving current through calculation, and then drives the fuel quantity adjusting module on the fuel injection pump to enable the fuel quantity adjusting module to reach the target fuel quantity slip ring position;
after receiving the oil injection advance angle value of the target collected by the first control module, calculating appropriate driving current by combining with the received timing travel feedback signal, and driving a timing electromagnetic valve to enable the oil injection advance angle to reach the target position;
and after receiving the expected state signal value of the oil feeding electromagnetic valve of the oil injection pump acquired by the first control module, driving the oil feeding electromagnetic valve of the oil injection pump to be opened or closed.
Further, as a preferable scheme of the system of the present invention, the first control module is an ECU, the second control module is a PCU, and the ECU and the PCU communicate with each other through a CAN bus; PCU directly places in the fuel regulation module of injection pump, and with the oil mass position feedback sensor and the temperature sensor integration of fuel regulation module in an organic whole, cools off through the fuel in the injection pump.
Further, as a preferable embodiment of the system of the present invention, in order to immerse the PCU in oil, it is necessary to cover the chip surface with a three-proof adhesive to prevent the electronic components from being corroded by the diesel oil and the water mixture.
In addition, in order to enhance the reliability and convenience of the system, the connection wire harness of the PCU, the sensor and the actuator on the pump is as short as possible and is connected by adopting an independent connector; the interface of PCU and ECU adopts extra connector to connect.
Fault processing and fault information feedback on the fuel injection pump:
the faults of a sensor and an actuator on the fuel injection pump are divided into two stages according to hazard grades, wherein one is a serious fault, and the engine is caused to fly; the other is a regular failure. When a sensor or an actuator on the pump has a conventional fault, the PCU feeds back relevant fault information to the ECU in time in the form of fault codes through the bus. When a serious fault occurs, the PCU directly controls to close the oil inlet electromagnetic valve and simultaneously sends fault information to the ECU.
Claims (7)
1. A control method for an electronically controlled position-type distribution pump, based on two independent control modules, respectively a first control module arranged on the engine and a second control module arranged on the injection pump, characterized in that it comprises the following steps:
s1, the first control module collects current engine rotating speed electric signals and vehicle signals to calculate a target oil injection quantity value, a target oil injection advance angle value, an expected state signal value of an oil inlet electromagnetic valve of an oil injection pump and an engine rotating speed signal value, and transmits the four calculated signal values to a second control module;
step S2, the second control module performs the following three actions according to the four signal values transmitted by the first control module, wherein the actions are as follows:
adjusting the fuel injection quantity: the second control module calculates the position of a target oil mass slip ring according to the engine rotating speed signal value and the target oil injection quantity value transmitted by the first control module and the temperature signal collected by the fuel oil temperature sensor on the self-injection pump, and then calculates the position of the target oil mass slip ring and the signal of the oil mass slip ring position sensor on the self-injection pump together to obtain a proper driving current so as to drive an oil mass regulator on the oil injection pump to enable the oil mass regulator to reach the position of the target oil mass slip ring;
adjusting the advance angle of oil injection: the second control module combines a timing stroke sensor signal received from the oil injection pump according to a target oil injection advance angle signal transmitted from the first control module, obtains a proper driving current through calculation, and drives the timing electromagnetic valve to enable the oil injection advance angle to reach a target position;
controlling an oil inlet electromagnetic valve: and the second control module receives the expected state signal value of the oil feeding electromagnetic valve of the oil injection pump transmitted from the first control module and then drives the oil feeding electromagnetic valve of the oil injection pump to be opened or closed.
2. A control method for an electronically controlled position dispensing pump according to claim 1, wherein in step S1, said vehicle signal comprises: an accelerator pedal signal, an intake pressure temperature signal, an engine coolant temperature signal, a vehicle speed signal, a key switch signal and a brake switch signal.
3. The control method for the position type electric control distribution pump according to claim 1, wherein in step S2, a PID control algorithm is adopted when driving the oil quantity regulator on the injection pump.
4. A control method for an electronically controlled position distributor pump according to claim 1, wherein in step S2, a PID control algorithm is used when the timing solenoid valve is driven to inject fuel.
5. A control system for a position type electric control distribution pump is characterized by comprising an engine, an oil injection pump, a first control module, a second control module, a fuel oil temperature sensor, an oil quantity adjusting module, a timing electromagnetic valve, an oil inlet electromagnetic valve, an oil quantity slip ring position sensor and a timing stroke sensor, wherein the engine is connected with the fuel oil injection pump through a transmission line,
the first control module is arranged on the engine and used for acquiring a current engine rotating speed electric signal and a whole vehicle signal to calculate a target oil injection quantity value, a target oil injection advance angle value, an expected state signal value of an oil feeding electromagnetic valve of an oil injection pump and an engine rotating speed signal value and transmitting the calculated values to the second control module;
the fuel temperature sensor is arranged on the fuel injection pump and used for detecting a fuel temperature signal value on the fuel injection pump;
the oil mass slip ring position sensor is used for detecting and obtaining an oil mass slip ring position feedback signal and feeding the oil mass slip ring position feedback signal back to the second control module;
the timing stroke sensor is used for detecting a timing stroke feedback signal of an oil injection advance angle position and feeding the timing stroke feedback signal back to the second control module;
the second control module is arranged on the fuel injection pump, receives an engine rotating speed signal value and a target fuel injection quantity value which are transmitted by the first control module and is combined with a temperature signal of the fuel temperature sensor to calculate a target fuel quantity slip ring position, combines the target fuel quantity slip ring position with the fuel quantity slip ring position feedback signal to obtain a proper driving current through calculation, and then drives the fuel quantity adjusting module on the fuel injection pump to enable the fuel quantity adjusting module to reach the target fuel quantity slip ring position;
after receiving the oil injection advance angle value of the target collected by the first control module, calculating appropriate driving current by combining with the received timing travel feedback signal, and driving a timing electromagnetic valve to enable the oil injection advance angle to reach the target position;
and after receiving the expected state signal value of the oil feeding electromagnetic valve of the oil injection pump acquired by the first control module, driving the oil feeding electromagnetic valve of the oil injection pump to be opened or closed.
6. A control system for an electric position control dispensing pump according to claim 5, wherein said first control module is an ECU and said second control module is a PCU, and wherein said ECU and PCU communicate via a CAN bus; PCU directly places in the oil mass adjusting module of injection pump, and with the oil mass position feedback sensor and the temperature sensor integration of oil mass adjusting module in an organic whole, cools off through the fuel in the injection pump.
7. Control system for an electronically controlled position dispensing pump according to claim 6, characterized in that the PCU is externally covered with a three-proof glue coating.
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| CN201710841982.0A CN107420211B (en) | 2017-09-18 | 2017-09-18 | Control method and system for position type electric control distribution pump |
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| EP0737807A2 (en) * | 1995-04-12 | 1996-10-16 | Toyota Jidosha Kabushiki Kaisha | Electronically controlled fuel injection system for a diesel engine |
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| CN206429311U (en) * | 2016-12-02 | 2017-08-22 | 斯太尔动力（常州）发动机有限公司 | Unit injector diesel engine fuel-firing electric control gear |
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2017
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| JPH08177587A (en) * | 1994-12-21 | 1996-07-09 | Nippondenso Co Ltd | Fuel injection control device for diesel engine |
| EP0737807A2 (en) * | 1995-04-12 | 1996-10-16 | Toyota Jidosha Kabushiki Kaisha | Electronically controlled fuel injection system for a diesel engine |
| JPH09119336A (en) * | 1995-10-27 | 1997-05-06 | Nissan Motor Co Ltd | Injection quantity controller of distributing-type pump |
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