CN114454863A

CN114454863A - Control method and system for output torque of electric control engine

Info

Publication number: CN114454863A
Application number: CN202210166203.2A
Authority: CN
Inventors: 孙卫军; ***; 朱娟娟; 柳雍靓; 张旭
Original assignee: Dongfeng Cummins Engine Co Ltd
Current assignee: Dongfeng Cummins Engine Co Ltd
Priority date: 2022-02-23
Filing date: 2022-02-23
Publication date: 2022-05-10
Anticipated expiration: 2042-02-23
Also published as: CN114454863B

Abstract

The invention relates to the technical field of electronic control engines, in particular to a method and a system for controlling output torque of an electronic control engine. Acquiring the power consumption of the electric equipment; calculating the input torque T required by the power consumption of the electric equipment at the current rotating speed of the generator_G(ii) a Calculating a limit torque T_L＝T₁+T_GAnd will limit the torque T_LTo the engine controller ECM, where T₁Maximum torque allowed for the running driveline; the engine controller ECM receives the limit torque T_LThen, the engine request torques T and T are compared_xOf (2), wherein T_xTo limit the torque T_LWith the maximum net torque T that the engine can deliver_FThe smaller of these; if the engine requires torque T<T_xLet the net torque T of the engine output_ET; if the engine demand torque T is more than or equal to T_xLet the net torque T of the engine output_E＝T_x. Avoid the power transmission system from being receivedThe large torque is used for damage, a power transmission system with higher strength does not need to be designed, the product cost is reduced, and the popularization and the implementation are easy.

Description

Control method and system for output torque of electric control engine

Technical Field

The invention relates to the technical field of electronic control engines, in particular to a method and a system for controlling output torque of an electronic control engine.

Background

Some special vehicles are divided into an upper mounting part and a lower mounting part, wherein the lower mounting part is a vehicle running power transmission system, and the maximum design torque of the lower mounting part is T₁. The upper part is provided with a plurality of high-power electric equipment which is supplied with power by a generator, and the maximum input torque required by the generator is T₂. The vehicle running power transmission system and the generator are powered by an electric control engine.

The net torque output capacity of the engine is higher than the torque bearing capacity of the lower-mounted power transmission system, and when the power consumption of the upper-mounted electric equipment is low and the load borne by the power transmission system is large, the power transmission system can be damaged.

In order to avoid the above problems, the conventional method adopts measures such as a mechanical design structure with higher strength, selection of materials with higher quality and the like, so that the strength of the power transmission system is increased, and the power transmission system can bear the maximum net torque which can be output by an engine. The method can greatly improve the cost of the vehicle, is not beneficial to popularization and implementation, and has higher strength and high design difficulty of the mechanical structure.

Disclosure of Invention

The invention aims to provide a method and a system for controlling the output torque of an electric control engine, aiming at the defects of the prior art, wherein a mechanical structure with higher strength is not required to be designed, the manufacturing cost of a vehicle is not increased, and the method and the system are easy to popularize and implement.

The invention provides a control method for output torque of an electric control engine, which adopts the technical scheme that: comprises that

Acquiring the power consumption of the electric equipment;

calculating an input torque T required to meet the power consumption of the electrical consumer at the current rotational speed of the generator_G；

Calculating a limit torque T_L＝T₁+T_GAnd limiting the torque T_LSent to the engine controller ECM, where T₁Maximum torque allowed for the running driveline;

the engine controller ECM receives the limit torqueT_LThen, the engine request torques T and T are compared_xOf (2), wherein T_xTo limit the torque T_LWith the maximum net torque T that the engine can deliver_FThe smaller of these;

if the engine requires torque T<T_xLet the net torque T of the engine output_E＝T；

If the engine demand torque T is more than or equal to T_xLet the net torque T of the engine output_E＝T_x。

Preferably, if the engine controller ECM does not receive the torque limit T_LThen the engine request torques T and T are compared_yOf (2), wherein T_yMaximum torque T allowed for a driving power transmission system₁With the maximum net torque T that the engine can deliver_FThe smaller of these;

if the engine requires torque T<T_yLet the net torque T of the engine output_E＝T；

If the engine demand torque T is more than or equal to T_yLet the net torque T of the engine output_E＝T_y。

Preferably, if the calculated torque T is_G≥T₂Then T will be₂As the input torque T required by the current rotating speed of the generator to meet the power consumption of the electric equipment_GWherein, T₂The input torque required by the generator to meet the maximum power consumption of the consumer.

Preferably, the power consumption of the electric equipment is acquired and the limit torque T is calculated_LAll realize through vehicle control unit VCM.

Preferably, the VCM of the vehicle control unit limits the torque T through a CAN line_LTo the engine controller ECM.

The invention also provides a control system for the output torque of the electric control engine, which adopts the technical scheme that: comprises that

The VCM of the whole vehicle controller is used for acquiring the power consumption of the electric equipment, acquiring the rotating speed of the generator and calculating the current rotating speed of the generator to meet the requirementInput torque T required for the electrical power of an electrical consumer_GCalculating the limit torque T_L＝T₁+T_GAnd limiting the torque T_LTo the engine controller ECM, where T₁Maximum torque allowed for the running driveline;

an engine controller ECM for, upon receipt of a limit torque T_LThen, the engine request torques T and T are compared_xOf size (c), wherein, T_xTo limit the torque T_LWith the maximum net torque T that the engine can deliver_FThe smaller of these;

Preferably, the engine controller ECM is also adapted to receive no limit torque T_LWhile comparing the engine request torques T and T_yOf (2), wherein T_yMaximum torque T allowed for a driving power transmission system₁With the maximum net torque T that the engine can deliver_FThe smaller of these;

The invention has the beneficial effects that: the system and the method for controlling the output torque of the electric control engine can ensure that the torque acted on the power transmission system by the engine is less than or equal to the maximum torque T allowed to be accepted by the power transmission system at any time₁The maximum torque T output of the engine exceeding the permissible acceptance of the driveline₁The torque of the generator is totally acted on the generator, thereby preventing the power transmission system from being damaged due to the excessive torque. The method can ensure that the electric control engine of the special vehicle meets the requirements of loading electric equipment and unloading the electric equipmentThe power required by the driving power transmission system can be protected, the lower driving power transmission system can not be damaged due to overlarge input torque, the manufacturing cost of the vehicle can not be increased, and the popularization and the implementation are easy.

Drawings

FIG. 1 is a schematic diagram of the connection of an electric control engine torque output control system according to the present invention;

FIG. 2 is a flow chart of a method for controlling an output torque of an electronically controlled engine according to the present invention;

FIG. 3 is a schematic diagram of torque versus speed of the engine.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Fig. 1 shows a schematic connection diagram of a control system for electronically controlling engine output torque provided by a preferred embodiment of the present application (fig. 1 shows a first embodiment of the present application), and for convenience of description, only the parts related to the present embodiment are shown, and the detailed description is as follows:

the system comprises an engine, a driving power transmission system, a generator, electric equipment and a vehicle control unit VCM, wherein the engine comprises an engine control unit ECM, and the electric equipment comprises a plurality of equipment. One part of net output power of the engine is used for driving the lower-mounted driving power transmission system to drive the vehicle to run; the other part is used for driving a generator to generate electricity. The generator provides power to the upper-mounted electric equipment.

The VCM is used for acquiring the power required by the electric equipment in real time through the bus and converting the power into the input torque T required by the current rotating speed of the generator_G. And sending a torque limit signal T to the ECM via the bus_L,T_L＝T₁+T_GWherein T is₁Is the maximum allowable input torque T of the under-drive driveline held in the VCM₁，T_GIs the input torque required at the current rotational speed of the generator.

The ECM is adapted to receive the torque limiting signal T_LControlling net torque T output by the engine_ELet T be_ENot more than T_LAnd the external characteristic curve T of the engine_FOf smaller value of, wherein T_FIs the maximum net torque that the engine can deliver, which varies with engine speed.

When the ECM for some reason does not receive the limit torque T of VCM_LNet torque T of engine output_ECharacteristic curve T of the receiver_FAnd maximum allowable input torque T of power transmission system₁Limited by a small value.

Wherein, let T_ENot more than T_LAnd an engine external characteristic curve T_FThe smaller value of (d) specifically means:

If the engine demand torque T is more than or equal to T_xLet the net torque T of the engine output_E＝T_x；

Wherein, T_xTo limit the torque T_LWith the maximum net torque T that the engine can deliver_FThe smaller of these.

Wherein net torque T of engine output_ECharacteristic curve T of the external receiver_FAnd maximum allowable input torque T of power transmission system₁The smaller value is specifically limited to:

If the engine demand torque T is more than or equal to T_yLet the net torque T of the engine output_E＝T_y；

Wherein, T_yMaximum torque T allowed for a driving power transmission system₁With the maximum net torque T that the engine can deliver_FThe smaller of these.

As shown in fig. 2, the flow of the control method for the output torque of the electronic control engine is as follows:

s100: and the VCM of the vehicle control unit acquires the power utilization power of the electric equipment.

S200: VCM calculates the input torque T required by the generator to meet the power consumption of the electric equipment at the current rotating speed of the generator_G。

S300: VCM calculates the input torque T required by the generator_GMaximum torque T allowed to be accepted by the running power train₁Sum, i.e. limit torque T_LAnd sends it to the engine controller ECM via the bus.

S400: the ECM judges whether a torque limiting signal T sent by the VCM is received_LIf yes, go to S510; otherwise, S520 is performed.

S510: net torque T of engine output_EBy the external characteristic curve T of the engine_FAnd limiting the torque T_LIs limited by the smaller value of (a).

S520: net torque T of engine output_EBy the external characteristic curve T of the engine_FAnd the maximum torque T allowed to be received by the running power train₁Is limited by the smaller value of (a).

As shown in fig. 3, normally, the vehicle control unit VCM sends the limit torque T to the engine controller ECM through the bus_L. The ECM receives the limiting torque T_LControlling net torque T output by the engine_ESo as to be lower than the external characteristic curve T_FAnd limiting the torque T_LThe smaller of these.

Limit torque T issued by VCM_L＝T₁+T_GAnd 0 is less than or equal to T_G≤T₂Wherein, T₁Maximum torque, T, allowed for the undermount driveline_GInput torque, T, required by the generator to meet the electrical power of the consumer₂The input torque required by the generator to meet the maximum power consumption of the consumer.

When no electric equipment is working, T_G＝0，T_L＝T₁At this time, the engine operates at points B (i.e., 0 and T)₁In between), net engine output torque T_ECharacteristic curve T of quilt_FAnd the maximum torque T the driveline is allowed to accept₁Is limited by the smaller value of (a).

When the electric equipment works, T_G>0, when the engine is working at point A or B, the net output torque T of the engine_ECharacteristic curve T of quilt_FAnd limiting the torque T_LIs limited by the smaller value of (a).

If for some reason the ECM does not receive the limit torque T of the VCM_LNet output torque T of the engine_ECharacteristic curve T of quilt_FAnd the maximum torque T the driveline is allowed to accept₁Limited by the smaller of the two.

As described above, the torque applied to the driveline by the engine is small at all timesEqual to or higher than the maximum torque T allowed to be accepted by the driveline₁The maximum torque T output of the engine exceeding the permissible acceptance of the driveline₁The torque of the generator is totally acted on the generator, thereby preventing the power transmission system from being damaged due to the excessive torque.

It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. A control method for output torque of an electronic control engine is characterized in that: comprises that

Acquiring the power consumption of electric equipment;

Calculating a limit torque T_L＝T₁+T_GAnd limiting the torque T_LTo the engine controller ECM, where T₁Maximum torque allowed for the running driveline;

the engine controller ECM receives the limit torque T_LThen, the engine request torques T and T are compared_xOf (2), wherein T_xTo limit the torque T_LWith the maximum net torque T that the engine can deliver_FThe smaller of these;

2. The control method of output torque of an electronically controlled engine according to claim 1, characterized in that: if the engine controller ECM does not receive the limit torque T_LThen the engine request torques T and T are compared_yOf size (c), wherein, T_yMaximum torque T allowed for a driving power transmission system₁With the maximum net torque T that the engine can deliver_FThe smaller of these;

3. The control method of output torque of an electronically controlled engine according to claim 1, characterized in that: if the calculated torque T is_G≥T₂Then T will be₂As the input torque T required by the current rotating speed of the generator to meet the power consumption of the electric equipment_GWherein, T₂The input torque required by the generator to meet the maximum power consumption of the consumer.

4. The control method of output torque of an electronically controlled engine according to claim 1, characterized in that: the method comprises the steps of obtaining the power consumption of the electric equipment and calculating the limit torque T_LAll realize through vehicle control unit VCM.

5. The control method of output torque of an electronically controlled engine according to claim 4, characterized in that: vehicle control unit VCM passes through CAN line will limit moment of torsion T_LTo the engine controller ECM.

6. A control system for electrically controlling output torque of an engine, characterized in that: comprises that

The VCM of the whole vehicle controller is used for acquiring the power consumption of the electric equipment, acquiring the rotating speed of the generator and calculating the input torque T required by the power consumption of the electric equipment at the current rotating speed of the generator_GCalculating the limit torque T_L＝T₁+T_GAnd limiting the torque T_LTo the engine controller ECM, where T₁Maximum torque allowed for the running driveline;

an engine controller ECM for, upon receipt of a limit torque T_LThen, the engine request torques T and T are compared_xOf size (c), wherein, T_xTo limit the torque T_LWith the maximum net torque T that the engine can deliver_FThe smaller of the two;

7. An electronically controlled engine output torque control system as set forth in claim 6 wherein: the engine controller ECM is further adapted to receive no limit torque T_LWhile comparing the engine request torques T and T_yOf (2), wherein T_yMaximum torque T allowed for a driving power transmission system₁With the maximum net torque T that the engine can deliver_FThe smaller of the two;