阅读说明：本技术 一种用于压路机的发动机控制方法 (Engine control method for road roller ) 是由 邓庆华 于 2020-05-25 设计创作，主要内容包括：本发明涉及一种用于压路机的发动机控制方法,包括负载检测单元,用于检测压路机的整车负载,根据所述整车负载生成目标扭矩；转速设置单元,用于设置发动机转速为预设转速；所述发动机转速通过如下方式控制：A.获取设定转速以及工况模式；B.基于工况模式确定对应的转速控制策略；C.获取与车辆负载相关的参数,并计算得到车辆负载；D.基于所述设定转速以及所述车辆负载,采用确定出的转速控制策略确定实际转速,控制发动机在实际转速下运行；ECU,根据所述预设转速计算预设扭矩,比较所述目标扭矩与所述预设扭矩。本发明不仅采用ECU来调整压路机的发动机转速,可以保证压路机在遇到负载变化时,快速稳定转速,进而保证对于路面的压实效果。(The invention relates to an engine control method for a road roller, which comprises a load detection unit, a torque detection unit and a torque control unit, wherein the load detection unit is used for detecting the load of the whole road roller and generating a target torque according to the load of the whole road roller; the rotating speed setting unit is used for setting the rotating speed of the engine to be a preset rotating speed; the engine speed is controlled as follows: A. acquiring a set rotating speed and a working condition mode; B. determining a corresponding rotating speed control strategy based on the working condition mode; C. obtaining parameters related to vehicle load, and calculating to obtain the vehicle load; D. determining an actual rotating speed by adopting a determined rotating speed control strategy based on the set rotating speed and the vehicle load, and controlling an engine to operate at the actual rotating speed; and the ECU calculates a preset torque according to the preset rotating speed and compares the target torque with the preset torque. The invention not only adopts the ECU to adjust the engine rotating speed of the road roller, but also can ensure that the rotating speed of the road roller is quickly stabilized when the road roller meets load change, thereby ensuring the compaction effect on the road surface.)

1. A method of controlling an engine for a road roller, comprising:

the load detection unit is used for detecting the whole vehicle load of the road roller and generating a target torque according to the whole vehicle load;

the rotating speed setting unit is used for setting the rotating speed of the engine to be a preset rotating speed, and the rotating speed of the engine is controlled in the following mode:

A. acquiring a set rotating speed and a working condition mode;

B. determining a corresponding rotating speed control strategy based on the working condition mode; the rotating speed control strategy at least comprises a constant rotating speed control strategy and a speed regulation control strategy;

C. obtaining parameters related to vehicle load, and calculating to obtain the vehicle load based on the obtained parameters related to the vehicle load;

D. determining an actual rotating speed by adopting a determined rotating speed control strategy based on the set rotating speed and the vehicle load, and controlling an engine to operate at the actual rotating speed;

and the ECU calculates a preset torque according to the preset rotating speed, compares the target torque with the preset torque, controls the rotating speed of the engine to be smaller than the preset rotating speed if the target torque is larger than the preset torque, and controls the rotating speed of the engine to be larger than the preset rotating speed if the target torque is smaller than the preset torque.

2. A method for controlling an engine for a road roller as claimed in claim 1, wherein: the remote pedal unit is connected to the rotating speed setting unit and the ECU and used for sending preset rotating speed data set by the rotating speed setting unit to the ECU, and the ECU controls the rotating speed of the engine to be the preset rotating speed.

3. A method for controlling an engine for a road roller as claimed in claim 2, wherein: the remote pedal unit includes: the electronic control unit comprises a first remote pedal and a second remote pedal, wherein the first remote pedal transmits a first signal to the ECU, the second remote pedal transmits a second signal to the ECU, the ECU is used for judging whether the ratio of the voltage of the first signal to the voltage of the second signal is equal to a preset ratio or not, and if not, prompt information is generated.

4. A method for controlling an engine for a road roller as claimed in claim 1, wherein: the rotation speed setting unit includes: the rotary switch and/or the point switch group is used for setting the rotating speed of the engine, wherein the point switch group comprises a first point switch, a second point switch, a third point switch and a fourth point switch, and the first point switch is used for continuously or discontinuously increasing the rotating speed of the engine; the second point switch is used for continuously or discontinuously reducing the rotating speed of the engine; the third point switch is used for starting a function of setting the rotating speed of the engine; the fourth switch is used to turn off the function of setting the rotational speed of the engine.

5. A method for controlling an engine for a road roller as claimed in claim 1, wherein: the working condition modes at least comprise an H gear, an A gear and an E gear;

wherein the determining a corresponding speed control strategy based on the operating mode comprises:

if the working condition mode is H gear, determining that the rotating speed control strategy is a constant rotating speed control strategy;

and if the working condition mode is the A gear or the E gear, determining that the rotating speed control strategy is a speed regulation control strategy.

Technical Field

The invention relates to the technical field of road rollers, in particular to an engine control method for a road roller.

Background

The road roller is widely used for filling compaction operation of large engineering projects such as high-grade highways, railways, airport runways, dams, stadiums and the like, and in order to ensure the compaction operation effect of the road roller, the fluctuation of the engine speed of the road roller is required to be as small as possible, and even the engine speed is required to be output at a constant speed.

When the load suddenly changes or the engine starts to vibrate, the torque output by the engine cannot automatically adapt to the load change of the engine in the compaction process or under different working conditions, so that the engine needs to be adjusted by a speed regulator to ensure the stability of the rotating speed.

The speed regulator is mainly of a mechanical structure, and an induction element of the speed regulator can be converted into mechanical quantity according to the load change of the diesel engine so as to adjust oil supply equipment and automatically increase and decrease the oil supply quantity of an oil injection pump, so that the diesel engine can run at a relatively stable rotating speed, and the compaction effect of the road roller is ensured. Because the existing speed regulators all adopt mechanical structures, the defects of poor control precision, inaccurate adjustment of fuel injection quantity, slow response of the mechanical structures and the like exist, the fluctuation time of the engine speed is long, the engine speed of the road roller is unstable for a long time, and the original set value cannot be reached after the load changes, so that the compaction effect of the road roller is influenced.

Disclosure of Invention

In view of the above, the present invention provides a method of controlling an engine for a road roller.

The technical scheme adopted by the invention for solving the technical problems is as follows: the engine control method for the road roller comprises a load detection unit, a torque conversion unit and a torque conversion unit, wherein the load detection unit is used for detecting the whole vehicle load of the road roller and generating a target torque according to the whole vehicle load;

the rotating speed setting unit is used for setting the rotating speed of the engine to be a preset rotating speed, and the rotating speed of the engine is controlled in the following mode:

A. acquiring a set rotating speed and a working condition mode;

B. determining a corresponding rotating speed control strategy based on the working condition mode; the rotating speed control strategy at least comprises a constant rotating speed control strategy and a speed regulation control strategy;

C. obtaining parameters related to vehicle load, and calculating to obtain the vehicle load based on the obtained parameters related to the vehicle load;

D. determining an actual rotating speed by adopting a determined rotating speed control strategy based on the set rotating speed and the vehicle load, and controlling an engine to operate at the actual rotating speed;

and the ECU calculates a preset torque according to the preset rotating speed, compares the target torque with the preset torque, controls the rotating speed of the engine to be smaller than the preset rotating speed if the target torque is larger than the preset torque, and controls the rotating speed of the engine to be larger than the preset rotating speed if the target torque is smaller than the preset torque.

Preferably, the device further comprises a remote pedal unit connected to the rotating speed setting unit and the ECU and used for sending preset rotating speed data set by the rotating speed setting unit to the ECU, and the ECU controls the rotating speed of the engine to be the preset rotating speed.

Preferably, the remote pedal unit includes: the electronic control unit comprises a first remote pedal and a second remote pedal, wherein the first remote pedal transmits a first signal to the ECU, the second remote pedal transmits a second signal to the ECU, the ECU is used for judging whether the ratio of the voltage of the first signal to the voltage of the second signal is equal to a preset ratio or not, and if not, prompt information is generated.

Preferably, the rotation speed setting unit includes: the rotary switch and/or the point switch group is used for setting the rotating speed of the engine, wherein the point switch group comprises a first point switch, a second point switch, a third point switch and a fourth point switch, and the first point switch is used for continuously or discontinuously increasing the rotating speed of the engine; the second point switch is used for continuously or discontinuously reducing the rotating speed of the engine; the third point switch is used for starting a function of setting the rotating speed of the engine; the fourth switch is used to turn off the function of setting the rotational speed of the engine.

Preferably, the working condition modes at least comprise an H gear, an A gear and an E gear;

wherein the determining a corresponding speed control strategy based on the operating mode comprises:

if the working condition mode is H gear, determining that the rotating speed control strategy is a constant rotating speed control strategy;

and if the working condition mode is the A gear or the E gear, determining that the rotating speed control strategy is a speed regulation control strategy.

Compared with the prior art, the invention has the following beneficial effects:

the ECU is adopted to adjust the engine speed of the road roller, and compared with a mechanical structure, the ECU has the advantages of high precision and quick response, and can ensure that the speed of the road roller is quickly stabilized when the road roller meets load change, thereby ensuring the compaction effect on the road surface.

Detailed Description

The invention will now be described in detail with reference to exemplary embodiments thereof and the description herein being illustrative of the invention and not limiting thereof.

A method of controlling an engine for a road roller, comprising: the load detection unit is used for detecting the whole vehicle load of the road roller and generating a target torque according to the whole vehicle load; the rotating speed setting unit is used for setting the rotating speed of the engine to be a preset rotating speed, and the rotating speed of the engine is controlled in the following mode:

A. acquiring a set rotating speed and a working condition mode;

B. determining a corresponding rotating speed control strategy based on the working condition mode; the rotating speed control strategy at least comprises a constant rotating speed control strategy and a speed regulation control strategy;

C. obtaining parameters related to vehicle load, and calculating to obtain the vehicle load based on the obtained parameters related to the vehicle load;

D. determining an actual rotating speed by adopting a determined rotating speed control strategy based on the set rotating speed and the vehicle load, and controlling an engine to operate at the actual rotating speed;

and the ECU calculates a preset torque according to a preset rotating speed, compares the target torque with the preset torque, controls the rotating speed of the engine to be smaller than the preset rotating speed if the target torque is larger than the preset torque, and controls the rotating speed of the engine to be larger than the preset rotating speed if the target torque is smaller than the preset torque.

The engine of the embodiment is an electronic control engine which is provided with an ECU (electronic control unit), the ECU can accurately respond to the load change of the road roller, and the increase and decrease of the rotating speed of the engine are accurately controlled through a constant rotating speed control logic.

Compared with a mechanical structure, the ECU is an electronic control element, the control precision is high, the response is fast, the stable rotating speed can be quickly recovered after the engine meets load change, the rotating speed of the engine can be further ensured to be consistent with the preset rotating speed set in advance, and therefore the compaction effect of the road roller on the road surface is ensured.

The ECU in this embodiment has the functions of calculation and control, and when the engine is running, the ECU can collect signals of each sensor, perform calculation, convert the result of the calculation into a control signal, and control the operation of a controlled object (for example, the engine). Control of the memory, input/output interfaces, and other external circuitry is also achieved.

Preferably, the system further comprises:

and the remote pedal unit is connected to the rotating speed setting unit and the ECU and used for sending preset rotating speed data set by the rotating speed setting unit to the ECU, and the ECU controls the rotating speed of the engine to be a preset rotating speed.

Preferably, the remote pedal unit comprises: a first remote pedal transmitting a first signal to the ECU and a second remote pedal transmitting a second signal to the ECU,

the ECU is used for judging whether the ratio of the voltage of the first signal to the voltage of the second signal is equal to a preset ratio or not, and if not, prompt information is generated.

The first remote pedal and the second remote pedal are respectively connected to corresponding pins of the ECU, for example, the pins X1-24 may provide a voltage signal for the first remote pedal, a controllable voltage dividing element (such as a variable resistor) is disposed in the first remote pedal, the controllable voltage dividing element changes a voltage dividing amount according to preset speed data, so that a voltage dividing amount related to the preset speed data is transmitted to the pins X1-07 of the ECU, wherein the pins X1-25 may be grounded.

The ECU may determine the preset rotation speed based on the first signal or the second signal. Generally, the ratio of the voltage of the first signal to the voltage of the second signal may be preset to be a constant value, for example, 2/1, and when the ratio of the two voltages is not equal to 2/1, it may be determined that there is a problem in the input preset speed data, so that a prompt message may be generated to prompt an operator to prevent the preset rotating speed input by the operator from being inconsistent with the preset rotating speed received by the ECU, which may result in poor compacting effect. Thus, the input preset speed data is verified through the two remote pedals.

The engine in the embodiment can run at a preset speed preset by a user, so that the user does not need to step on a driving accelerator and only needs to operate a steering wheel. The engine can also be controlled to run in real time by a user, for example, when the user steps on a driving accelerator, an acceleration signal can be transmitted to the ECU through the first accelerator pedal and the second accelerator pedal, and further the rotating speed of the engine is improved. Similarly to the first and second remote pedals, the acceleration signal can also be verified by the first and second accelerator pedals.

Preferably, the rotation speed setting unit includes:

a knob switch and/or a point switch group for setting the rotating speed of the engine,

wherein the point switch group comprises a first point switch, a second point switch, a third point switch and a fourth point switch,

the first point switch is used for continuously or discontinuously increasing the rotating speed of the engine;

the second point switch is used for continuously or discontinuously reducing the rotating speed of the engine;

the third point switch is used for starting the function of setting the rotating speed of the engine;

the fourth switch is used to turn off the function of setting the rotational speed of the engine. And the ECU controls the rotating speed of the engine to be smaller than or larger than the preset rotating speed by adjusting the oil injection quantity of the engine oil injection nozzle, and controls the rotating speed of the engine to be larger than the preset rotating speed.

The working condition modes at least comprise an H gear, an A gear and an E gear;

wherein the determining a corresponding speed control strategy based on the operating mode comprises:

if the working condition mode is H gear, determining that the rotating speed control strategy is a constant rotating speed control strategy;

and if the working condition mode is the A gear or the E gear, determining that the rotating speed control strategy is a speed regulation control strategy.

The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.