阅读说明：本技术 一种用于车辆的发动机扭矩的测量方法和测量系统 (Measuring method and measuring system for engine torque of vehicle ) 是由 蔡文远 霍元 王一戎 马帅营 于 2020-05-08 设计创作，主要内容包括：本发明提供了一种用于车辆的发动机扭矩的测量方法和测量系统,涉及増程器控制领域。测量方法包括：获取所述发电机的扭矩；获取所述増程器的旋转角加速度；根据所述发电机的扭矩和所述増程器的旋转角加速度来获得所述发动机当前的实际扭矩。本发明提供的测量方法和测量系统可以简单且精准地测量发动机扭矩。(The invention provides a method and a system for measuring engine torque of a vehicle, and relates to the field of range extender control. The measuring method comprises the following steps: acquiring the torque of the generator; acquiring the rotation angular acceleration of the range extender; and obtaining the current actual torque of the engine according to the torque of the generator and the rotation angular acceleration of the range extender. The measuring method and the measuring system provided by the invention can simply and accurately measure the torque of the engine.)

1. A method for measuring engine torque of a vehicle, the vehicle comprising a range extender, the range extender comprising an engine and a generator, the method comprising:

acquiring the torque of the generator;

acquiring the rotation angular acceleration of the range extender;

and obtaining the current actual torque of the engine according to the torque of the generator and the rotation angular acceleration of the range extender.

2. The measurement method according to claim 1, further comprising, after obtaining the current actual torque of the engine:

acquiring a required torque of the engine;

and adjusting the current actual torque of the engine to be consistent with the required torque.

3. The measurement method according to claim 1, wherein the obtaining of the current actual torque of the engine from the torque of the generator and the angular acceleration of rotation of the range extender is performed according to the following formula:

where Te denotes a current actual torque of the engine, Tm denotes a current actual torque of the generator, J denotes a moment of inertia of a rotating component in the range extender, and ω denotes the rotational angular velocity.

4. A method of measurement according to claim 3, wherein the generator is a permanent magnet synchronous motor, the torque of the generator being obtained according to the following formula:

wherein, p represents the number of pole pairs,denotes flux linkage, iq denotes quadrature current, id denotes direct current, L_dRepresenting the direct-axis inductance, L_qRepresenting quadrature inductance.

5. A measuring method according to claim 3, characterized in that the angular velocity of rotation is obtained by means of a sensor.

6. The utility model provides a measurement system for engine torque for vehicle, the vehicle includes increases journey ware, it includes engine and generator to increase journey ware, its characterized in that, measurement system includes:

a generator controller for obtaining a torque of the generator;

and the range extender controller is connected with the generator controller and used for acquiring the rotation angular acceleration of the range extender and obtaining the current actual torque of the engine according to the torque of the generator and the rotation angular acceleration of the range extender.

7. The measurement system of claim 6, wherein the range extender controller is further configured to:

acquiring a required torque of the engine;

and adjusting the current actual torque of the engine to be consistent with the required torque.

8. The measurement system of claim 6, wherein the range extender controller obtains the current actual torque of the engine according to the following formula:

where Te denotes a current actual torque of the engine, Tm denotes a torque of the generator, J denotes a moment of inertia of a rotating component in the range extender, and ω denotes the rotational angular velocity.

9. The measurement system of claim 8, wherein the generator is a permanent magnet synchronous motor, and the generator controller obtains the torque of the generator according to the following formula:

wherein, p represents the number of pole pairs,denotes flux linkage, iq denotes quadrature current, id denotes direct current, L_dRepresenting the direct-axis inductance, L_qRepresenting quadrature inductance.

10. The measurement system of claim 9, wherein the range extender controller further comprises:

a sensor for acquiring the rotational angular velocity.

Technical Field

The invention relates to the field of range extender control, in particular to a method and a system for measuring engine torque of a vehicle.

Background

In order to control the output torque of the engine in the range extender vehicle, it is necessary to obtain the actual output torque of the engine. In the prior art, the actual output torque of an engine cannot be directly measured and calculated through a sensor, and is calculated through a torque model, although an engine electric control system is developed for many years, the torque model is still complex, certain errors exist in torque control in a limit environment, and particularly the torque model needs to be corrected at high temperature or low pressure.

Disclosure of Invention

It is an object of a first aspect of the invention to provide a simple and accurate method of measuring engine torque.

It is a further object of the first aspect of the present invention to provide a method of measuring engine torque that does not require correction.

It is a still further object of the first aspect of the present invention to provide a method of measuring engine torque that enables closed loop control of engine torque.

It is an object of a second aspect of the invention to provide a simple and accurate engine torque measurement system.

According to a first aspect of the present invention, there is provided a method of measuring engine torque for a vehicle, the vehicle including a range extender including an engine and a generator, the method comprising:

acquiring the torque of the generator;

acquiring the rotation angular acceleration of the range extender;

and obtaining the current actual torque of the engine according to the torque of the generator and the rotation angular acceleration of the range extender.

Optionally, after obtaining the current actual torque of the engine, the method further comprises:

acquiring a required torque of the engine;

and adjusting the current actual torque of the engine to be consistent with the required torque.

Optionally, the obtaining of the current actual torque of the engine according to the torque of the generator and the angular acceleration of the range extender is performed according to the following formula:

where Te denotes a current actual torque of the engine, Tm denotes a torque of the generator, J denotes a moment of inertia of a rotating component in the range extender, and ω denotes the rotational angular velocity.

Optionally, the generator is a permanent magnet synchronous motor, and the torque of the generator is obtained according to the following formula:

wherein, p represents the number of pole pairs,denotes flux linkage, iq denotes quadrature current, id denotes direct current, L_dRepresenting the direct-axis inductance, L_qRepresenting quadrature inductance.

Alternatively, the angular velocity of rotation is obtained by a sensor.

According to a second aspect of the present invention, there is also provided a measurement system for engine torque of a vehicle, the vehicle including a range extender including an engine and a generator, the measurement system including:

a generator controller for obtaining a torque of the generator;

and the range extender controller is connected with the generator controller and used for acquiring the rotation angular acceleration of the range extender and obtaining the current actual torque of the engine according to the torque of the generator and the rotation angular acceleration of the range extender.

Optionally, the range extender controller is further configured to:

acquiring a required torque of the engine;

and adjusting the current actual torque of the engine to be consistent with the required torque.

Optionally, the range extender controller obtains a current actual torque of the engine according to the following formula:

where Te denotes a current actual torque of the engine, Tm denotes a torque of the generator, J denotes a moment of inertia of a rotating component in the range extender, and ω denotes the rotational angular velocity.

Optionally, the generator is a permanent magnet synchronous motor, and the generator controller obtains a torque of the generator according to the following formula:

wherein, p represents the number of pole pairs,denotes flux linkage, iq denotes quadrature current, id denotes direct current, L_dRepresenting the direct-axis inductance, L_qRepresenting quadrature inductance.

Optionally, the range extender controller further includes:

a sensor for acquiring the rotational angular velocity.

Firstly, the scheme provided by the invention obtains the current actual torque of the engine by obtaining the torque of the generator and the rotation angular acceleration of the range extender and then according to the torque of the generator and the rotation angular acceleration of the range extender. In the range extending vehicle, the torque of engine output is transmitted to the generator on the one hand, and on the other hand is transmitted to the spare part of rotation in the range extender, therefore can directly obtain the current actual torque of engine through above-mentioned mode to realize the direct measurement of the current actual torque of engine, guaranteed the accuracy of measuring result moreover. Furthermore, the engine torque model is simplified, the complexity of a control system is reduced, and the calibration workload of engine torque control is greatly reduced.

Secondly, since the torque of the generator and the torque of the rotating parts of the range extender are not affected by the environment, the current actual torque of the engine obtained by the method of the present invention under the limit condition does not need to be corrected.

And finally, comparing the current actual torque of the engine with the current required torque, and adjusting the actual torque of the engine according to the required torque, so that the torque of the engine meets the requirement of the actual required torque, and the closed-loop control of the torque of the engine is realized.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

FIG. 1 is a block flow diagram of a method of measuring engine torque for a vehicle according to one embodiment of the present invention;

FIG. 2 is a block flow diagram of a method of measuring engine torque for a vehicle according to another embodiment of the present invention;

fig. 3 is a schematic configuration diagram of an engine torque measuring system for a vehicle according to an embodiment of the present invention.

Detailed Description

FIG. 1 is a block flow diagram of a method of measuring engine torque for a vehicle according to one embodiment of the present invention. As shown in fig. 1, the present invention provides a method for measuring an engine torque of a vehicle, the vehicle including a range extender including an engine 50 and a generator 40, the method generally including:

s10: acquiring the output torque of the generator 40;

s20: acquiring the rotation angular acceleration of the range extender;

s30: the current actual torque of the engine 50 is obtained from the output torque of the generator 40 and the rotational angular acceleration of the range extender.

According to the scheme provided by the embodiment, the current actual torque of the engine 50 is obtained by acquiring the output torque of the generator 40 and the rotational angular acceleration of the range extender and then according to the output torque of the generator 40 and the rotational angular acceleration of the range extender. In the extended range vehicle, the torque output by the engine 50 is transmitted to the generator 40 on one hand and the rotating parts in the range extender on the other hand, so that the current actual torque of the engine 50 can be directly obtained through the above manner of the embodiment. Thereby enabling a direct measurement of the actual torque currently at the engine 50 and ensuring accurate results. Further, the engine 50 torque model is simplified, the complexity of a control system is reduced, and the calibration workload of the engine 50 torque control is greatly reduced.

Next, since the torque of the generator 40 and the torque of the rotating parts of the range extender are not affected by the environment, the current actual torque of the engine 50 obtained by the method of the present invention does not need to be corrected even under the limit condition.

Furthermore, the method provided by the embodiment can be completed through the original system of the extended range vehicle, and can be realized by only implanting a corresponding program into the original system, and neither a new structure nor a change to the vehicle structure is required to be added, so that the current actual torque of the engine 50 can be obtained by adopting the method after the corresponding program is implanted into the existing extended range vehicle, and the method provided by the embodiment is beneficial to control and development and has very high applicability.

Fig. 2 is a block flow diagram of a method for measuring torque of an engine 50 for a vehicle according to another embodiment of the present invention, as shown in fig. 2, and in a specific embodiment, after obtaining a current actual torque of the engine 50, the method further includes:

s40: acquiring a required torque of the engine 50;

s50: the current actual torque of the engine 50 is adjusted to coincide with the required torque.

The purpose of measuring the current actual torque of the engine 50 is to implement closed-loop control of the engine torque, and by comparing the current actual torque with the current required torque, the actual torque of the engine 50 is adjusted according to the required torque, so that the torque of the engine 50 meets the requirement of the actual required torque.

Specifically, when the current actual torque of the engine 50 is smaller than the required torque, the range extender controller 30 controls the engine 50 to increase the torque so that the torque of the engine 50 reaches the required torque. Conversely, when the current actual torque of the engine 50 is greater than the required torque, the range extender controller 30 controls the engine 50 to reduce the torque so that the torque of the engine 50 reaches the required torque. The current actual torque and the required torque of the engine 50 are verified to realize the closed-loop control of the torque, so that the torque of the engine 50 can meet the actual requirement, the engine 50 can work at the optimal torque, and the problems that the vehicle dynamic performance is poor due to the fact that the torque of the engine 50 is lower than the required torque and the fuel oil is wasted due to the fact that the torque of the engine 50 is higher than the required torque are avoided.

Specifically, in one embodiment, obtaining the current actual torque of the engine 50 according to the output torque of the generator 40 and the angular acceleration of the rotation of the range extender is performed according to the following formula:

where Te denotes the current actual torque of the engine 50, Tm denotes the torque of the generator 40, J denotes the moment of inertia of the rotating component in the range extender, and ω denotes the rotational angular velocity.

In particular, the rotating parts are, for example, the rotor of the generator and/or the engine flywheel.

Preferably, the generator 40 is a permanent magnet synchronous motor, and the output torque thereof can be obtained by measuring the current thereof, and the torque of the generator 40 (permanent magnet synchronous motor) is obtained according to the following formula:

wherein, p represents the number of pole pairs,denotes flux linkage, iq denotes quadrature current, id denotes direct current, L_dRepresenting the direct-axis inductance, L_qRepresenting quadrature inductance.

Preferably, in one embodiment, the rotation angular velocity is obtained by a sensor 31, in particular the sensor 31 may be a crankshaft phase sensor or a generator revolution sensor.

Fig. 3 is a schematic configuration diagram of a system for measuring torque of an engine 50 for a vehicle according to an embodiment of the present invention. As shown in fig. 3, the present invention further provides a system for measuring torque of an engine 50 of a vehicle, wherein the vehicle includes a range extender, the range extender includes the engine 50 and a generator 40, and the measuring system generally includes a generator controller 10 and a range extender controller 30. And a generator controller 10 for acquiring an output torque of the generator 40. During the use of the range-extended vehicle, the generator controller 10 is further configured to control the generator 40 in the range extender. The range extender controller 30 is connected to the generator controller 10, and is configured to obtain a rotational angular acceleration of the range extender, and obtain a current actual torque of the engine 50 according to the output torque of the generator 40 and the rotational angular acceleration of the range extender. In the process of obtaining the torque of the engine 50, the existing range extender controller 30 sends a torque measurement instruction, and the generator controller 10 obtains the output torque of the generator 40 according to the torque measurement instruction. The measuring system further comprises an engine controller 20 connected with the range extender controller 30.

According to the scheme provided by the embodiment, the output torque of the generator 40 is obtained through the generator controller 10, the range extender controller 30 obtains the rotation angular acceleration of the range extender, and then the range extender controller 30 obtains the current actual torque of the engine 50 according to the output torque of the generator 40 and the rotation angular acceleration of the range extender. In the extended range vehicle, the torque output by the engine 50 is transmitted to the generator 40 on one hand and the rotating parts in the range extender on the other hand, so that the current actual torque of the engine 50 can be directly obtained through the above manner of the embodiment. Thereby enabling a direct measurement of the actual torque currently at the engine 50 and ensuring accurate results. Further, the engine 50 torque model is simplified, the complexity of a control system is reduced, and the calibration workload of the engine 50 torque control is greatly reduced.

Next, since the torque of the generator 40 and the torque of the rotating parts of the range extender are not affected by the environment, the current actual torque of the engine 50 obtained by the method of the present invention does not need to be corrected even under the limit condition.

Furthermore, the method provided by the embodiment can be completed through the original system of the extended range vehicle, and can be realized by only implanting a corresponding program into the original system, and neither a new structure nor a change to the vehicle structure is required to be added, so that the current actual torque of the engine 50 can be obtained by adopting the method after the corresponding program is implanted into the existing extended range vehicle, and the method provided by the embodiment is beneficial to control and development and has very high applicability.

The purpose of measuring the current actual torque of the engine 50 is to compare the current actual torque with the current required torque, and then to adjust the actual torque of the engine 50 so that the torque of the engine 50 meets the actual required torque. In a specific embodiment, the range extender controller 30 is further configured to: acquiring a required torque of the engine 50; and the current actual torque of the engine 50 is adjusted to coincide with the required torque.

Specifically, when the current actual torque of the engine 50 is smaller than the required torque, the range extender controller 30 controls the engine 50 to increase the torque so that the torque of the engine 50 reaches the required torque. Conversely, when the current actual torque of the engine 50 is greater than the required torque, the range extender controller 30 controls the engine 50 to reduce the torque so that the torque of the engine 50 reaches the required torque. The current actual torque and the required torque of the engine 50 are verified to realize the closed-loop control of the torque, so that the torque of the engine 50 can meet the actual requirement, the engine 50 can work at the optimal torque, and the problems that the vehicle dynamic performance is poor due to the fact that the torque of the engine 50 is lower than the required torque and the fuel oil is wasted due to the fact that the torque of the engine 50 is higher than the required torque are avoided.

Specifically, in one embodiment, the range extender controller 30 obtains the current actual torque of the engine 50 according to the following formula:

where Te denotes the current actual torque of the engine 50, Tm denotes the torque of the generator 40, J denotes the moment of inertia of the rotating component in the range extender, and ω denotes the rotational angular velocity. In particular, the rotating parts are, for example, the rotor of the generator and/or the engine flywheel.

Preferably, the generator 40 is a permanent magnet synchronous motor, the output torque of the generator can be obtained by measuring the current of the permanent magnet synchronous motor, and the generator controller 10 obtains the torque of the generator 40 according to the following formula:

wherein, p represents the number of pole pairs,denotes flux linkage, iq denotes quadrature current, id denotes direct current, L_dRepresenting the direct-axis inductance, L_qRepresenting quadrature inductance.

Preferably, referring to fig. 3, in one embodiment, the range extender controller 30 further includes a sensor 31 for acquiring a rotation angular velocity. The sensor 31 may specifically be a crankshaft phase sensor 31 or a generator 40 rotation sensor 31.

Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.