Speed regulation control method based on TSC1 rotating speed request

Abstract

The invention discloses a speed regulation control method based on a TSC1 rotating speed request, which comprises the following steps: when a VCU (Complete Controller Unit) sends the TSC1 rotating speed request to an ECU (Engine Control Unit) through a CAN (Controller Area Network) bus, synchronously sending a Droop request, and according to the received rotating speed request information and speed regulation request information, carrying out speed regulation on the TSC1 rotating speed request in the controller according to the working load rate of an engine, and the corresponding speed regulation target rotating speed is calculated in real time, so that TSC1 speed regulation control is realized. According to the method, the defect that when an engineering machinery equipment main engine plant (OEM) requests the rotating speed of the engine in a TSC1 control mode, the speed of the engine cannot be controlled is overcome.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy-saving matching of diesel engines for engineering machinery applications, and relates to a method for speed regulation control of a diesel engine operating speed, and in particular to a speed regulation control method based on a TSC1 speed request. Background Art

[0002] Non-road construction machinery applications such as excavators, rotary drilling rigs, and air compressors have the characteristics of fixed gear operation. During operation, the load changes frequently and the speed fluctuates violently. Therefore, full-range speed control is usually required to maintain the stability of the working gear speed. In full-range speed control, the speed regulation rate is a very important control concept. It refers to the percentage of the stable speed at full load relative to the stable speed at no load when the engine is under full load. The speed regulation rate represents the ability of the engine to overcome speed fluctuations when the external load changes. The larger the value, the greater the degree of speed deviation allowed by the engine, the milder the engine speed control, and the lower the fuel consumption and noise of the whole machine. However, excessive speed regulation rate will also cause a large speed drop, affecting work efficiency. Being able to match the appropriate engine speed regulation rate to participate in speed control according to the application requirements of construction machinery equipment will help further reduce the equipment's operating fuel consumption.

[0003] At present, there are two main control methods for construction machinery to request the engine to operate at a certain speed. One is the throttle opening control method, commonly known as the throttle percentage control method, and the other is the torque speed control method, commonly known as the TSC1 control method.

[0004] The throttle opening control method is the most traditional and widely used control method. It can be requested through a hard line or by sending a message request through the CAN bus. Under this control method, the engine ECU will control the output of the engine speed corresponding to the throttle opening percentage based on the throttle opening requested by the whole machine. At the same time, the whole machine can synchronously request a suitable speed regulation rate (Droop) from the engine to participate in speed control, such as 6%, 8%, 12%, etc., to achieve the purpose of reducing working fuel consumption. The control strategy is relatively mature.

[0005] The second control method, TSC1 control, has been used more and more widely in recent years, especially for excavator applications. Many OEMs have chosen to use TSC1 speed control. TSC1 control directly sends speed requests through the bus, and OEMs do not need to consider the corresponding relationship between speed and throttle opening, so the request is simpler and more direct.

[0006] However, the TSC1 speed can only be requested through the CAN bus. Currently, according to public information inquiries, no diesel engine manufacturer has provided a speed control strategy and algorithm in its controller calibration software to implement the TSC1 speed regulation calculation. That is, when TSC1 requests a speed, the speed regulation control cannot be implemented. This is a shortcoming for engineering machinery applications that require the use of different speed regulation rates for energy-saving matching. Summary of the invention

[0007] In view of the fact that no diesel engine manufacturer in the prior art has provided a speed regulation control strategy and algorithm in its controller calibration software to implement TSC1 speed regulation calculation, that is, when TSC1 requests a speed, speed regulation control cannot be implemented, the present invention provides a speed regulation control method based on TSC1 speed request for TSC1 speed request control mode, and provides a new speed regulation control strategy and algorithm. When the whole machine controller VCU sends a TSC1 speed request to the engine controller ECU through the CAN bus, a speed regulation (Droop) request is sent synchronously. The engine controller calculates the corresponding speed regulation target speed in real time according to the engine workload rate inside the controller based on the received speed request information and speed regulation request information, thereby implementing TSC1 speed regulation control. This method solves the shortcoming that the engine has no speed regulation control when the OEM uses the TSC1 control mode to request the engine speed.

[0008] The purpose of the present invention is achieved through the following technical solutions:

[0009] The speed control method based on TSC1 speed request is also a TSC1 speed control strategy and algorithm for engineering machinery, including the following steps:

[0010] 1) The "TCS1 speed control" function is developed in the engine ECU control calibration software. The algorithm of TSC1 speed control target speed is as follows:

[0011] TSC1 speed regulation target speed = TSC1 requested speed - (TSC1 requested speed - TSC1 requested speed / (1 + requested speed regulation rate)) × engine workload rate

[0012] When the engine workload rate is 0%, that is, no-load and no speed regulation, the speed regulation target speed is equal to the TSC1 request speed itself;

[0013] When the engine load rate is 100%, that is, full-load speed regulation, the speed regulation target speed is equal to the lowest deviation speed allowed under the current requested speed regulation;

[0014] 2) During the operation of the engine, the vehicle control unit (VCU) sends TSC1 speed request messages and Droop speed adjustment request messages to the engine control unit (ECU) in real time through the CAN bus according to the matching requirements;

[0015] 3) The engine controller reads the current engine load rate in real time;

[0016] 4) The engine controller calculates the TSC1 speed control target speed in real time based on the received TSC1 request speed, requested speed control information and the current engine load rate, and performs speed control.

[0017] Furthermore, in step 2), the TSC1 speed request message is sent to the engine controller (ECU) in real time via the CAN bus, wherein the message complies with the J1939 protocol, PGN 0, SPN 898 specification.

[0018] Furthermore, in step 2), the Droop rate adjustment request message, wherein the message is in accordance with the J1939 protocol, PGN64971, SPN 2881 specifications.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] The speed control method based on TSC1 speed request described in the present invention can realize speed control of engineering machinery diesel engine under TSC1 speed control mode, so that the engine runs in a better fuel economy area, meeting the better fuel economy matching requirements of engineering machinery. Comparative verification shows that compared with the traditional TCS1 speed control method without speed control, the TSC1 speed control strategy provided by the present invention reduces the fuel consumption of crawler excavators using common gears by 5%-7% under 8%-12% speed control, with significant results. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a comparison chart of the effect of reducing working fuel consumption before and after the TSC1 speed control strategy provided by the present invention is applied to a certain brand of 22T crawler excavator;

[0022] Figure 2 It is a logic schematic diagram of the speed control method based on TSC1 speed request of the present invention;

[0023] Figure 3 It is a flow chart of the speed control method based on TSC1 speed request described in the present invention. DETAILED DESCRIPTION

[0024] The specific implementation modes of the present invention are further described below in conjunction with examples.

[0025] Example:

[0026] Taking a certain brand of 22T crawler excavator as an example, the speed control method based on TSC1 speed request includes the following steps:

[0027] 1) The "TCS1 speed control" function is developed in the engine ECU control calibration software. The algorithm of TSC1 speed control target speed is as follows:

[0028] TSC1 speed regulation target speed = TSC1 requested speed - (TSC1 requested speed - TSC1 requested speed / (1 + requested speed regulation rate)) × engine workload rate

[0029] When the engine workload rate is 0%, that is, no-load and no speed regulation, the speed regulation target speed is equal to the TSC1 request speed itself;

[0030] When the engine load rate is 100%, that is, full-load speed regulation, the speed regulation target speed is equal to the lowest deviation speed allowed under the current requested speed regulation;

[0031] 2) During the operation of the engine, the vehicle control unit (VCU) sends the TSC1 speed request message (message according to the J1939 protocol, PGN 0, SPN 898 specification) and the Droop speed adjustment request message (message according to the J1939 protocol, PGN 64971, SPN 2881 specification) to the engine control unit (ECU) in real time through the CAN bus according to the matching requirements;

[0032] 3) The engine controller reads the current engine load rate in real time;

[0033] 4) The engine controller calculates the TSC1 speed control target speed in real time based on the received TSC1 request speed, the requested speed control information and the current engine load rate, and performs speed control;

[0034] Figure 1 This is a comparison chart of the effect of reducing working fuel consumption before and after the TSC1 speed control strategy provided by the present invention is applied to a certain brand of 22T crawler excavator;

[0035] from Figure 1 It can be seen that, taking the E8 gear as an example, in step 2), the TSC1 speed requested by the vehicle controller VCU is 1800rpm, and the requested speed regulation rate is 12%. At the same time, if the current engine workload rate read by the engine controller in step 3 is 80%, according to the control algorithm of the present invention, the final actual TSC1 speed regulation target control speed is 1645rpm. Compared with the original TSC1 requested speed of 1800rpm, the 1645rpm after speed regulation falls within the engine's optimal economic zone speed range, thereby reducing actual working fuel consumption.

[0036] Figure 2 is a logic schematic diagram of the speed control method based on TSC1 speed request described in the embodiment;

[0037] Figure 3 It is a flow chart of the speed control method based on TSC1 speed request described in the embodiment.

[0038] Comparative Example:

[0039] The existing traditional TSC1 speed control method is very simple, as follows:

[0040] During the operation of the engine, the vehicle control unit (VCU) directly sends a TSC1 speed request message to the engine control unit (ECU) in real time through the CAN bus (the message is in accordance with the J1939 protocol, PGN 0, SPN 898 specification). The requested speed value is the final target value, there is no speed adjustment request and calculation, no engine workload rate reading and calculation, and the TSC1 speed request is the result. For example, for a certain brand of 22T excavator mentioned in the embodiment, before applying the control strategy of the present invention, in the E8 gear working gear, the TSC1 requested speed is 1800rpm, and the final control speed is also 1800rpm, and there is no speed adjustment control in the whole process.

[0041] The above description is only a preferred embodiment of the present invention. It should be pointed out that it is possible for a person skilled in the art to make several improvements and changes without departing from the creative concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A speed control method based on TSC1 speed request, characterized in that: The steps include: 1) The "TCS1 speed control" function is developed in the engine ECU control calibration software. The control algorithm of the TSC1 speed control target speed is as follows: TSC1 speed regulation target speed = TSC1 requested speed - (TSC1 requested speed - TSC1 requested speed / (1 + requested speed regulation rate)) × engine workload rate When the engine workload rate is 0%, that is, no-load and no speed regulation, the speed regulation target speed is equal to the TSC1 request speed itself; When the engine load rate is 100%, that is, full-load speed regulation, the speed regulation target speed is equal to the lowest deviation speed allowed under the current requested speed regulation; 2) During the operation of the engine, the vehicle controller VCU sends TSC1 speed request message and Droop speed adjustment request message to the engine controller ECU in real time through the CAN bus according to the matching requirements; 3) The engine controller reads the current engine load rate in real time; 4) The engine controller calculates the TSC1 speed control target speed in real time based on the received TSC1 request speed, requested speed control information and the current engine load rate, and performs speed control.

2. The speed control method based on TSC1 speed request according to claim 1, characterized in that: In step 1), the control algorithm of the TSC1 speed regulation target speed is: TSC1 speed regulation target speed = TSC1 request speed - (TSC1 request speed - TSC1 request speed / (1 + request speed regulation rate)) × engine workload rate.

3. The speed control method based on TSC1 speed request according to claim 1, characterized in that: In step 2), the TSC1 speed request message is sent to the engine controller in real time via the CAN bus, wherein the message complies with the J1939 protocol, PGN 0, SPN 898 specification.

4. The speed control method based on TSC1 speed request according to claim 1, characterized in that: In step 2), the Droop rate adjustment request message, wherein the message is in accordance with the J1939 protocol, PGN 64971, SPN 2881 specifications.

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