WO2013078915A1

WO2013078915A1 - Power matching system for electronic control engine and variable capacity hydraulic pump and the method thereof

Info

Publication number: WO2013078915A1
Application number: PCT/CN2012/082349
Authority: WO
Inventors: 单晓宁; 王科; 陈志�
Original assignee: 中联重科股份有限公司; 湖南中联重科专用车有限责任公司
Priority date: 2011-11-28
Filing date: 2012-09-28
Publication date: 2013-06-06
Also published as: CN102505996A; CN102505996B

Abstract

Disclosed in the present invention is a power matching system for an electronic control engine and a variable capacity hydraulic pump. The system comprises an electronic control engine (11); an engine controller (12) for measuring actual rotating speed of the electronic control engine; a master controller (13) for comparing the actual rotating speed with acquired target rotating speed, if the actual rotating speed is smaller than the target rotating speed and the difference between the target rotating speed and the actual rotating speed is larger than a set threshold value, suitable fine adjustment current is output to a proportional solenoid (14) according to the difference; the proportional solenoid (14), the opening of which is increased according to the received fine adjustment current; and a variable capacity hydraulic pump (15) which runs under the effect of power of the electronic control engine. The system increases the rotating speed of the electronic control engine by means of reducing load of the electronic control engine, reduces oil consumption for adjusting the rotating speed of the electronic control engine via the engine controller (12) and simultaneously makes the variable capacity hydraulic pump (15) stably run at the optimal power point of the electronic control engine. Also disclosed in the present invention is a method corresponding to the system.

Description

Power matching system and method for electronically controlled engine and variable hydraulic pump

The invention relates to the technical field of engineering machinery, and in particular to a power matching system and method for an electronically controlled engine and a variable hydraulic pump. Background technique

The efficiency and fuel economy of hydraulic engineering drives (especially excavators) are closely related to the performance of hydraulic pumps and engines. In daily engineering operations, on the one hand, the hydraulic pump is required to absorb the maximum torque of the engine to ensure the working capacity and working efficiency of the hydraulic pump; on the other hand, the absorption power of the hydraulic pump is stabilized at the optimal power point of the engine to reduce fuel consumption. . The external characteristic curve of the traditional mechanical engine is completely determined by the governor, and the torque, power and rotational speed of the working point have a direct corresponding relationship in the steady state. When power matching between a traditional mechanical engine and a hydraulic pump, the main engine speed is controlled, and the spindle speed is used as a feedback value of the closed loop control to achieve the maximum torque of the conventional mechanical engine for the hydraulic pump.

When the electronically controlled engine is used to drive the hydraulic pump, the speed control of the electronically controlled engine is relatively flexible, and the engine controller is connected with various sensors. When the sensor receives the signal that the abnormal speed is abnormal, the engine controller passes the fuel intake amount. The speed is automatically adjusted to achieve a constant speed. However, if the electronically controlled engine loses speed, it is completely controlled by its engine controller to control the amount of fuel, which leads to high energy consumption. And when the engine controller is used to adjust the speed of the electronically controlled engine, in the case where the absorption power of some hydraulic pumps suddenly increases, the adjustment is not timely, and the absorbed power of the variable hydraulic pump is not the optimal power of the electronically controlled engine. The situation at the point occurred. Summary of the invention

The invention provides a power matching system and method for an electronically controlled engine and a variable hydraulic pump. The system reduces the rotational speed of the electronically controlled engine by reducing the load of the electronically controlled engine, and reduces the speed of the electronically controlled engine by the engine controller. The fuel consumption also stabilizes the variable hydraulic pump at the optimal power point of the electronically controlled engine.

The power matching system of the electronically controlled engine and the variable hydraulic pump provided by the embodiment of the invention includes: an electronically controlled engine, an engine controller, a total controller, a proportional solenoid valve for controlling the displacement of the hydraulic pump of the variable, and a variable hydraulic pressure Pump, where

An electronically controlled engine, connected to a variable hydraulic pump through a coupling for driving a variable hydraulic pump; an engine controller for measuring the actual rotational speed of the electronically controlled engine;

The controller is connected to the engine controller for comparing the actual speed and the obtained target speed, if the actual speed is less than the target speed, and the difference between the target speed and the actual speed is greater than a set a threshold value, according to the magnitude of the difference, outputting a correspondingly adjusted trimming current to the proportional solenoid valve;

a proportional solenoid valve for adjusting the valve to reach a corresponding opening according to the received calibration current; adjusting the opening of the valve according to the received trimming current; the variable hydraulic pump for electricity The engine is operated under the power of the engine; during operation, the valve is discharged through the proportional solenoid valve.

The total controller is further configured to: when the difference between the target rotational speed and the actual rotational speed is not greater than a set threshold, the trimming current is approached to 0 by an initial value according to a set slope Output to a proportional solenoid valve;

The proportional solenoid valve is further configured to adjust the valve to gradually return to the opening degree before receiving the trimming current when the received trimming current approaches the initial value to 0 according to a set slope.

The overall controller is configured to obtain a target rotational speed according to performance data of the variable hydraulic pump and performance data of the electronically controlled engine.

The electronically controlled engine controller is connected to the overall controller via a CAN (Controller Area Network). The master controller is a PID (proportional-integral-derivative) controller.

Embodiments of the present invention also provide a power matching method for an electronically controlled engine and a variable hydraulic pump, including:

The engine controller measures an actual speed of the electronically controlled engine, and the electronically controlled engine is used to drive the variable hydraulic pump to operate;

The total controller compares the actual rotational speed with the obtained target rotational speed, and if the actual rotational speed is less than the target rotational speed, and the difference between the target rotational speed and the actual rotational speed is greater than a set threshold, The magnitude of the difference, the proportional solenoid valve outputs a correspondingly adjusted trimming current; the proportional solenoid valve adjusts its own valve to the corresponding opening according to the received calibration current; when the proportional solenoid receives the trimming current, according to the fine adjustment The size of the current is increased by the opening of the valve. The valve is a drain valve of the variable hydraulic pump during operation.

The method further includes:

If the difference between the comparison target speed and the actual speed is not greater than the set threshold, the total controller outputs the trimming current to the proportional solenoid valve according to a set slope from an initial value to 0;

When the trimming current received by the proportional solenoid valve approaches the initial value to 0 according to a set slope, the regulating valve gradually returns to the opening degree before receiving the trimming current.

The target rotational speed is obtained based on performance data of the variable hydraulic pump and performance data of the electronically controlled engine.

The electronically controlled engine controller is coupled to the overall controller via CAN.

The overall controller is a PID controller.

The power matching system and the corresponding method of the electronically controlled engine and the variable hydraulic pump provided by the invention pass the actual speed of the electronically controlled engine as a feedback signal, and the output is finely adjusted when the difference between the target speed and the actual speed is greater than the set threshold. The valve of the current regulating proportional solenoid valve achieves the effect of reducing the absorbed power of the variable hydraulic pump and reducing the load of the electronically controlled engine by controlling the discharge amount of the variable hydraulic pump, and the rotational speed of the electronically controlled engine is improved due to the load reduction. The solution of the invention reaches By reducing the absorbed power of the variable hydraulic pump and increasing the speed of the electronically controlled engine, the energy consumed by the engine controller to adjust the rotational speed is reduced; and the variable hydraulic pump is stabilized at the optimal power point of the electronically controlled engine. DRAWINGS

1 is a schematic structural diagram of a system according to an embodiment of the present invention;

2 is a schematic flow chart of a method according to an embodiment of the present invention. detailed description

In order to improve the electronically controlled engine speed by reducing the load of the electronically controlled engine, saving energy consumption solely by relying on the electronically controlled engine's own fuel quantity adjustment, and stabilizing the variable hydraulic pump at the optimal power point of the electronically controlled engine, the present invention provides An embodiment of a power matching system for an electronically controlled engine and a variable hydraulic pump.

The system structure of the embodiment of the present invention will be described below with reference to FIG.

As shown in Fig. 1, the power matching system of the electronically controlled engine and the variable hydraulic pump includes: an electronically controlled engine 11, an engine controller 12, a total controller 13, a proportional solenoid valve 14 for controlling the displacement of the variable hydraulic pump, and a variable Hydraulic pump 15.

The electronically controlled engine 11 is connected to the variable hydraulic pump 15 via a coupling for driving the variable hydraulic pump. In normal operation, the electronically controlled engine 11 rotates through the coupling to drive the variable hydraulic pump 15 to operate.

The engine controller 12 is used to measure the actual speed of the electronically controlled engine. The engine controller 12 measures the actual rotational speed of the electronically controlled engine through the sensor and sends it to the overall controller 13.

The controller 13 is connected to the engine controller 12 for comparing the actual speed and the obtained target speed. If the actual speed is less than the target speed, and the difference between the target speed and the actual speed is greater than The predetermined threshold value is used to output a correspondingly adjusted trimming current to the proportional solenoid valve according to the magnitude of the difference. The overall controller 13 receives the measurement by the engine controller 12 The actual speed of the electronically controlled engine compares the actual speed with the target speed. If the result of the comparison is that the actual speed is less than the target speed, that is, the engine speed, the total controller 13 calculates the difference between the target speed and the actual speed, and makes the difference again with a set threshold. In comparison, if the difference is larger than the set threshold, the output size is correspondingly adjusted according to the difference between the target speed and the actual speed, that is, the larger the difference, the larger the trimming current of the output. The output trimming current is used to supply a proportional solenoid valve.

Preferably, the overall controller 13 is further adapted to obtain the target rotational speed based on the performance data of the variable hydraulic pump 15 and the performance data of the electronically controlled engine 11. The target speed is based on various performance data of the variable hydraulic pump and various performance data of the electronically controlled engine, combined with the working environment of the variable hydraulic pump, etc., and comprehensively considers the optimal rotational speed of the electronically controlled engine. This optimum speed is also set to the engine controller to control the electronically controlled engine to reach the set speed. The electronically controlled engine 11 drives the variable hydraulic pump 15 to operate at the optimum speed.

Preferably, the engine controller 12 is coupled to the overall controller 13 via a controller area network. The controller area network is used for data transfer between the engine controller 12 and the overall controller 13.

Preferably, the overall controller is a PID controller. The PID controller is often used to compare the collected data with a reference value and use the difference as a new input value so that the system data reaches or remains at the reference value. The PID controller is used as a total controller to output a size-dependent trimming current according to the difference between the target speed and the actual speed.

The proportional solenoid valve 14 adjusts the valve to the corresponding opening according to the received calibration current; when the proportional solenoid receives the trimming current, adjusts the opening of the valve according to the magnitude of the trimming current, The valve is a drain valve for the variable hydraulic pump during operation. The proportional solenoid valve 14 controls the discharge amount of the variable hydraulic pump 15 by controlling the opening degree of the valve. When the variable hydraulic pump starts to work, the proportional solenoid valve 14 has a constant current supply, so that the opening degree of the valve remains unchanged, and the discharge amount of the control variable hydraulic pump does not change, so that the absorbed power of the variable hydraulic pump does not change.

When the proportional solenoid valve 13 receives the trimming current, the valve is controlled to increase the opening according to the magnitude of the trimming current, and the displacement of the variable hydraulic pump 15 is expanded. When the variable hydraulic pump 15 is drained When the amount is increased, the starting force of the variable hydraulic pump 15 is reduced, and the absorbed power is lowered. When the absorption power of the variable hydraulic pump is reduced, the load of the electronically controlled engine is reduced, and the rotational speed of the electronically controlled engine is increased.

When the speed of the electronically controlled engine rises back to a certain level, it is also necessary to adjust the absorption power of the variable hydraulic pump to match the optimal power when the electronically controlled engine returns to the target speed. Therefore, the overall controller 13 is further configured to: when the difference between the target rotational speed and the actual rotational speed is not greater than a set threshold, the trimming current is approached to 0 by an initial value according to a set slope. The output to the proportional solenoid valve; the proportional solenoid valve 14 is further used to adjust the valve to gradually return to the opening degree before receiving the trimming current when the received trimming current approaches the initial value to 0 according to a set slope. When the rotational speed of the electronically controlled engine 11 begins to rise, the engine controller 12 sends its actual rotational speed to the overall controller 13, and the overall controller 13 determines that the difference between the target rotational speed and the actual rotational speed is less than the set threshold value, The trimming current is output to the proportional solenoid valve 13 according to the set slope, and the valve of the proportional solenoid valve 13 gradually decreases the opening degree as the trimming current approaches the set slope according to the set slope, and the displacement of the variable hydraulic pump is gradually increased. Revert to the amount of liquid that is calibrated when the current control proportional solenoid valve is calibrated. At the end of the system adjustment process, the absorbed power of the variable hydraulic pump is restored, which is comparable to the optimal power point of the electronically controlled engine.

In the system of the embodiment, the detected electronically controlled engine speed is fed back to the overall controller by the engine controller, and the total controller compares the actual speed and the obtained target speed, when the actual speed is less than the target speed, and When the difference between the target rotational speed and the actual rotational speed is greater than the set threshold value, the total controller outputs a valve for increasing the opening degree of the trimming current control proportional solenoid valve 13 corresponding to the magnitude of the difference. When the valve opening is increased, the displacement of the variable hydraulic pump is increased, the starting force is reduced, and the absorbed power of the variable hydraulic pump is reduced. The reduced absorption power of the variable hydraulic pump reduces the load on the electronically controlled engine, and the rotational speed of the electronically controlled engine begins to rise. With this method, the energy consumption when adjusting solely by the electronically controlled engine controller can be reduced.

And in this embodiment, when the electronically controlled engine is raised to the target rotational speed, by gradually reducing the trimming current input to the proportional solenoid valve, the valve of the proportional solenoid valve is restored to the state before the fine adjustment current adjustment, and the displacement of the variable hydraulic pump The amount also returned to before the adjustment. In this way, the absorption work of the variable hydraulic pump The rate can be restored to match the optimal power of the electronically controlled engine.

The present invention also provides a power matching method for a corresponding variable hydraulic pump and an electronically controlled engine, and a method embodiment will be described below with reference to the accompanying drawings.

As shown in Figure 2, the method includes:

Step S201, the engine controller measures the actual speed of the electronically controlled engine.

The electronically controlled engine is used to drive variable hydraulic pump operation.

Step S202, the controller compares the actual speed and the obtained target speed. If the actual speed is less than the target speed, and the difference between the target speed and the actual speed is greater than a set threshold, then According to the magnitude of the difference, a proportionally-sized trimming current is output to the proportional solenoid valve.

Step S203: When the proportional solenoid valve receives the trimming current, adjust the opening degree of the valve according to the magnitude of the trimming current. The valve is a drain valve of the variable hydraulic pump during operation.

A constant calibration current is supplied to the proportional solenoid valve before the proportional solenoid valve receives the trimming current. The proportional solenoid valve adjusts its own valve to the corresponding opening according to the received calibration current, so that the displacement of the variable hydraulic pump is constant, and the absorbed power is constant. When the trimming current is received, the valve of the proportional solenoid valve increases.

In this embodiment, when the rotational speed is increased, the absorbed power of the variable hydraulic pump is also restored, and the method further includes: if the difference between the comparison target rotational speed and the actual rotational speed is not greater than the set threshold, The total controller outputs the trimming current to the proportional solenoid valve according to a set slope from an initial value to 0; when the trimming current received by the proportional solenoid valve approaches the initial value to 0 according to a set slope, the adjustment The valve gradually returns to the opening before receiving the trimming current. This step is used to restore the absorbed power of the variable hydraulic pump to the optimal power of the electronically controlled engine after the speed of the electronically controlled engine is increased.

The method for obtaining the target rotational speed in the embodiment is as follows: The total controller obtains the target rotational speed based on the performance data of the variable hydraulic pump and the performance data of the electronically controlled engine. Preferably, the engine controller and the overall controller are connected via a controller area network. Preferably, the overall controller is a PID controller.

In the method flow in this embodiment, the detected electronic control engine speed is fed back to the overall controller by the engine controller, and the total controller compares the actual speed and the obtained target speed, when the actual speed is less than the target speed, and When the difference between the target rotational speed and the actual rotational speed is greater than the set threshold value, the total controller outputs a valve for increasing the opening degree of the trimming current control proportional solenoid valve 13 corresponding to the magnitude of the difference. When the valve opening is increased, the displacement of the variable hydraulic pump is increased, the starting force is reduced, and the absorbed power of the variable hydraulic pump is reduced. The reduced absorption power of the variable hydraulic pump reduces the load on the electronically controlled engine, and the rotational speed of the electronically controlled engine begins to rise. With this method, the energy consumption when adjusting solely by the electronically controlled engine controller can be reduced. Moreover, the present embodiment also provides a solution for adjusting the absorbed power of the variable displacement hydraulic pump to the optimal power matching state with the electronically controlled engine when the electronically controlled engine is raised to the target rotational speed.

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Rights request

1. A power matching system for an electronically controlled engine and a variable hydraulic pump, the system comprising: an electronically controlled engine, an engine controller, a total controller, a proportional solenoid valve for controlling a displacement of a hydraulic pump of a variable, Variable hydraulic pump, wherein

a proportional solenoid valve for adjusting the valve to reach a corresponding opening according to the received calibration current; and adjusting the opening of the valve according to the magnitude of the trimming current received;

Variable hydraulic pump for operation under the power of an electronically controlled engine; during operation, the valve is drained through a proportional solenoid valve.

2. The system according to claim 1, wherein the total controller is further configured to: when a difference between the target rotational speed and the actual rotational speed is not greater than a set threshold, Outputting the trimming current to the proportional solenoid valve according to a set slope from an initial value to 0;

The proportional solenoid valve is further configured to adjust the valve to gradually return to an opening degree before receiving the trimming current when the received trimming current approaches the initial value to 0 according to a set slope.

3. The system according to claim 1, wherein the total controller is configured to obtain a target rotational speed based on performance data of the variable hydraulic pump and performance data of the electronically controlled engine.

4. The system of claim 1 wherein the engine controller is coupled to the overall controller via a controller area network CAN.

5. The system of claim 1 wherein said total controller is a PID ratio-integral-derivative controller.

6. A power matching method for an electronically controlled engine and a variable hydraulic pump, the method comprising:

An engine controller measures an actual speed of the electronically controlled engine, and the electronically controlled engine is used to drive a variable hydraulic pump to operate;

The total controller compares the actual rotational speed with the obtained target rotational speed, and if the actual rotational speed is less than the target rotational speed, and the difference between the target rotational speed and the actual rotational speed is greater than a set threshold, The magnitude of the difference, and output a correspondingly adjusted trimming current to the proportional solenoid valve;

The proportional solenoid valve adjusts the valve to the corresponding opening according to the received calibration current; when the proportional solenoid receives the trimming current, according to the magnitude of the trimming current, the opening of the valve is adjusted, and the valve is The displacement hydraulic pump is a drain valve during operation.

7. The method according to claim 6, wherein the method further comprises: if the difference between the comparison target speed and the actual speed is not greater than a set threshold, the total controller The trimming current is output to the proportional solenoid valve from an initial value approaching zero according to a set slope;

8. The method of claim 6 wherein the method further comprises: The controller obtains the target speed based on the performance data of the variable hydraulic pump and the performance data of the electronically controlled engine.

9. The method of claim 6 wherein the engine controller is coupled to the overall controller via CAN.

10. The method of claim 6 wherein the total controller is a PID controller.