CN111361563B - Hybrid power heavy truck stop control method - Google Patents
Hybrid power heavy truck stop control method Download PDFInfo
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- CN111361563B CN111361563B CN202010232313.5A CN202010232313A CN111361563B CN 111361563 B CN111361563 B CN 111361563B CN 202010232313 A CN202010232313 A CN 202010232313A CN 111361563 B CN111361563 B CN 111361563B
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- 238000011084 recovery Methods 0.000 claims abstract description 26
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- 238000002474 experimental method Methods 0.000 claims description 8
- 230000007935 neutral effect Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
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- 230000002411 adverse Effects 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
- B60W30/18109—Braking
- B60W30/18127—Regenerative braking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/06—Combustion engines, Gas turbines
- B60W2710/0644—Engine speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/08—Electric propulsion units
- B60W2710/083—Torque
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Hybrid Electric Vehicles (AREA)
Abstract
The invention discloses a hybrid power heavy truck stop control method, which relates to the technical field of new energy heavy trucks and comprises the following steps: s1: obtaining the rotating speed information of an engine after the vehicle is stopped; s2: judging whether the rotating speed of the engine is greater than a second fixed value V2, if so, enabling the ISG motor to enter an energy recovery mode, and if not, ending; s3: and when the ISG motor enters the energy recovery mode, judging whether the rotating speed of the ISG motor is less than a third fixed value V3, if so, enabling the ISG motor to exit the energy recovery mode, otherwise, executing a step S2. The control method can solve the problems that in the prior art, a transmission is easy to have long duration and large noise when the hybrid power heavy truck is in the process from engine flameout to complete stop of an engine flywheel.
Description
Technical Field
The application relates to the technical field of new energy heavy trucks, in particular to a hybrid power heavy truck stop control method.
Background
With the rapid growth of high-horsepower tractors in the industry, the requirement of environmental protection upgrading and user reduction of vehicle cost, the hybrid tractor has rapidly developed by the advantages of oil consumption reduction, power improvement and the like.
At present, the power system configuration of hybrid power in the heavy truck industry generally adopts P1 and P2 structures, and the ISG can realize intervention torque increase when the whole vehicle has large torque demand and energy recovery when the vehicle is in a braking working condition. The P1 type structure is that the motor is placed at the position of the original flywheel behind the engine and in front of the clutch; the P2 type structure is that the motor is placed in front of the gearbox after the clutch.
The Chinese invention patent CN 105691382B discloses a control method, a device and a system for automobile energy recovery, wherein the control method comprises the following steps: judging whether the gearbox finishes executing the gear-up and gear-off operation or not; if so, controlling the motor to enter a power generation state to convert the kinetic energy of the motor and the gearbox into electric energy to be stored in a battery for later use; monitoring whether the synchronous rotation speed difference of the gearbox is within a preset range; if so, stopping generating power and controlling the gearbox to execute gear shifting operation; otherwise, the main power source is subjected to synchronous speed regulation so that the synchronous speed difference reaches the preset range, and the battery recovers the electric energy generated by the motor, wherein the main power source is the motor.
In order to increase the rotational inertia of the power transmission chain, an ISG motor, a motor damper and the like are introduced. The P1 type structure increases the rotational inertia of the power transmission chain due to the introduction of key components such as an ISG motor, a motor damper and the like. For a certain hybrid commercial vehicle, the rotational inertia of the idling system is increased by 59 percent compared with that of a traditional fuel vehicle. The torsional response of the power transmission chain is improved in the steady state conditions, but it also causes problems in the following conditions: when the engine is flamed out until the engine flywheel is completely stopped, the gearbox is easy to generate noise with long duration and large sound level; the abnormal sound affects not only the driving comfort of the whole vehicle, but also the service life of parts of the gearbox; in addition, the abnormal sound has little effect through the teaching of the parameters of the shock absorber.
Disclosure of Invention
The embodiment of the application provides a hybrid power heavy truck stop control method, which can solve the problems that in the prior art, when an engine is flamed out until an engine flywheel is completely stopped, a gearbox is easy to have long duration and high noise.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: a hybrid power heavy truck stop control method comprises the following steps:
s1: obtaining the rotating speed information of an engine after the vehicle is stopped;
s2: judging whether the rotating speed of the engine is greater than a second fixed value V2If yes, enabling the ISG motor to enter an energy recovery mode, and if not, ending;
s3: when the ISG motor enters the energy recovery mode, whether the rotating speed of the ISG motor is smaller than a third fixed value V or not is judged3If so, the ISG motor is caused to exit the energy recovery mode, otherwise, the step S2 is executed.
On the basis of the scheme, when the clutch switch is closed, the neutral switch is closed and the vehicle speed is less than a certain first fixed value V1And the vehicle is determined to be stopped when the ignition key is switched from START to OFF.
On the basis of the scheme, the V is1Is 0.001 km/h.
Based on the above scheme, in step S2, the slope setting of the anti-drag torque and the anti-drag rotation speed of the ISG motor is determined according to the maximum generated power and the maximum battery charging power of the ISG motor.
On the basis of the scheme, when the ISG motor enters the energy recovery mode, the ISG motor can adopt a torque control mode or a rotating speed control mode.
On the basis of the scheme, when the rotation speed control mode is entered, the ISG motor applies the anti-dragging torque, and the anti-dragging torque is controlled according to the set rotation speed time two-dimensional table of the ISG motor.
On the basis of the scheme, the set rotating speed time two-dimensional table is obtained according to experiments, and the anti-drag torque applied by the ISG motor in real time is obtained according to the set rotating speed time two-dimensional table through interpolation.
On the basis of the scheme, when the torque control mode is entered, the ISG motor applies a back dragging torque, and the back dragging torque is controlled according to the set torque time two-dimensional table of the ISG motor.
On the basis of the scheme, the set torque time two-dimensional table is obtained according to experiments, and the anti-drag torque applied by the ISG motor in real time is obtained according to the set torque time two-dimensional table through interpolation.
On the basis of the scheme, the second fixed value V2Is 700r/min, the third constant value V3Is 100 r/min.
Compared with the prior art, the invention has the advantages that: when the hybrid power heavy truck stop control method is used, the rotating speed of the engine is greater than a second fixed value V by judging the rotating speed of the engine after the stop2And meanwhile, enabling the ISG motor to enter an energy recovery mode. Because the existence of the energy recovery system resistance of the ISG motor, the rotating speed of the inertia rotating part is continuously reduced, so that the rotating speed of the ISG motor is rapidly reduced, the process that the engine is flamed out to completely stop the flywheel of the engine is shortened, the duration of the gearbox is easily shortened, the influence of noise generated by the gearbox is reduced, the driving comfort of the whole vehicle is improved, the service life of parts of the gearbox is prolonged, and energy can be recovered. When the rotation speed of the ISG motor is less than a third fixed value V3When the engine is in the idle state, the ISG motor is enabled to exit the energy recovery mode, and the possibility that the engine rotates reversely or the ISG excessively drags the crankshaft to generate another noise can be avoided.
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In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a hybrid power heavy truck shutdown control method in an embodiment of the present invention;
FIG. 2 is a diagram illustrating the engine speed with/without active control of the ISG motor in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a hybrid power heavy truck stop control method, which can solve the problems that in the prior art, when an engine is flamed out until an engine flywheel is completely stopped, a gearbox is easy to have long duration and high noise.
Fig. 1 is a flowchart of a hybrid power heavy truck shutdown control method in an embodiment of the present invention, and as shown in fig. 1, the present invention provides a hybrid power heavy truck shutdown control method, including the following steps:
s1: obtaining the rotating speed information of an engine after the vehicle is stopped;
s2: judging whether the rotating speed of the engine is greater than a second fixed value V2If yes, enabling the ISG motor to enter an energy recovery mode, and if not, ending;
s3: when the ISG motor enters the energy recovery mode, whether the rotating speed of the ISG motor is smaller than a third fixed value V or not is judged3If so, the ISG motor is caused to exit the energy recovery mode, otherwise, the step S2 is executed.
When the hybrid power heavy truck stop control method is used, the rotating speed of the engine is greater than a second fixed value V by judging the rotating speed of the engine after the stop2And meanwhile, enabling the ISG motor to enter an energy recovery mode. Because the existence of the energy recovery system resistance of the ISG motor, the rotating speed of the inertia rotating part is continuously reduced, so that the rotating speed of the ISG motor is rapidly reduced, the process that the engine is flamed out to completely stop the flywheel of the engine is shortened, the duration of the gearbox is easily shortened, the influence of noise generated by the gearbox is reduced, the driving comfort of the whole vehicle is improved, the service life of parts of the gearbox is prolonged, and energy can be recovered. When the rotation speed of the ISG motor is less than a third fixed value V3When the engine is in the idle state, the ISG motor is enabled to exit the energy recovery mode, and the possibility that the engine rotates reversely or the ISG excessively drags the crankshaft to generate another noise can be avoided.
FIG. 2 is a diagram of the engine speed with/without active control of the ISG motor in the embodiment of the invention, as shown in FIG. 2, when a certain hybrid commercial vehicle enters a shutdown ISG energy recovery mode and the ISG enters a speed control mode, an inertia system can be stably stopped from an idle speed of 700r/min to 0 within a short time. The idling speed of 700r/min is calibrated according to the actual condition, and is obviously improved from the subjective feelings of the ISG rotating speed fluctuation range and the noise; the abnormal sound duration is shortened from the original 1.7s to less than 1.0 s.
Preferably, when the clutch switch is closed, the neutral switch is closed and the vehicle speed is less than a certain first fixed value V1And the vehicle is determined to be stopped when the ignition key is switched from START to OFF.
In the present embodiment, the positions of the clutch and the gear are taken into consideration, and the vehicle speed is taken into consideration, so that it is determined whether the vehicle is stopped and not operated, so as not to adversely affect the performance of the following steps when the vehicle is coasting down a slope. In addition, the ignition key is ensured to be switched from START to OFF when the igniter is just turned OFF and the engine continues to rotate for a period of time due to inertia.
Preferably, said V1Is 0.001 km/h.
In this embodiment, V is1Set to 0.001km/h, V1The setting is calibrated according to the actual working condition, the vehicle can be ensured to be stopped, the vehicle can slide when the vehicle meets the conditions that a clutch switch is closed, a neutral switch is closed and an ignition key is switched from START to OFF, and the setting cannot be applied to the following steps, the ISG motor is started to recover energy, and the setting can well avoid the situation.
Preferably, in step S2, the slope setting of the anti-drag torque and the anti-drag rotation speed of the ISG motor is determined according to the maximum power generation power and the maximum battery charging power of the ISG motor.
In this embodiment, the slopes of the anti-drag torque and the anti-drag rotation speed of the ISG motor are both required to ensure that the maximum power generation power and the maximum battery charging power of the ISG motor cannot be exceeded, so as to avoid damage to electrical components due to an excessive charging current.
Preferably, when the ISG motor enters the energy recovery mode, the ISG motor may adopt a torque control mode or a rotational speed control mode.
In this embodiment, when the ISG motor enters the energy recovery mode, the anti-drag torque and power of the ISG motor can be controlled by controlling the torque or the rotation speed of the ISG motor, so as to ensure that the engine is decelerated at the optimal speed, thereby achieving better riding comfort.
Preferably, when entering the rotation speed control mode, the ISG motor applies a back-dragging torque, and the back-dragging torque is controlled according to a set rotation speed time two-dimensional table of the ISG motor.
Preferably, the set rotating speed time two-dimensional table is obtained through experiments, and the anti-drag torque applied by the ISG motor in real time is obtained through interpolation according to the set rotating speed time two-dimensional table.
In the present embodiment, the engine is decelerated at the optimum speed to achieve a better riding comfort. In the method, the relation between the anti-dragging torque applied by the ISG motor and the set rotating speed time is determined through a large number of experiments, a good rotating speed time two-dimensional table is made, and in use, the real-time applied anti-dragging torque is obtained through interpolation according to the set rotating speed time two-dimensional table.
Preferably, when entering the torque control mode, the ISG motor applies a back-drag torque, which is controlled according to a set torque-time two-dimensional table of the ISG motor.
Preferably, the set torque time two-dimensional table is obtained through experiments, and the anti-drag torque applied by the ISG motor in real time is obtained through interpolation according to the set torque time two-dimensional table.
In the present embodiment, the engine is decelerated at the optimum speed to achieve a better riding comfort. In the method, the relation between the anti-dragging torque applied by the ISG motor and the set torque time is determined through a large number of experiments, a good torque time two-dimensional table is formulated, and in use, the anti-dragging torque applied in real time is obtained through interpolation according to the set torque time two-dimensional table.
Preferably, said second constant value V2Is 700r/min, the third constant value V3Is 100 r/min.
In the present embodiment, the second constant value V2700r/min, third constant value V3Is 100 r/min. Namely, the vehicle is stopped, the rotating speed of the engine is more than 700r/min, and the ISG motor is involved in rapidly reducing the rotating speed of the engine. Second constant value V2700r/min, third constant value V3The speed is 100r/min, the speed is calibrated according to the actual working condition, when the rotating speed of the ISG motor is less than 100r/min, the phenomenon of rotating speed reversal of the engine or excessive reverse dragging of the crankshaft by the ISG can be prevented, and when the rotating speed enters an abnormal sound insensitive rotating speed area, the ISG exits the energy recovery mode.
In summary, the method can not only improve the driving comfort of the whole vehicle and prolong the service life of parts of the gearbox, but also recover most of inertia system energy so as to improve the economy of the whole vehicle.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A hybrid power heavy truck stop control method is characterized by comprising the following steps:
s0: when the clutch switch is closed, the neutral switch is closed and the vehicle speed is less than a certain first fixed value V1And the ignition key is switched from START to OFF, and the vehicle is judged to be stopped;
s1: obtaining the rotating speed information of an engine after the vehicle is stopped;
s2: judging whether the rotating speed of the engine is greater than a second fixed value V2If yes, enabling the ISG motor to enter an energy recovery mode, wherein the energy recovery mode comprises a torque control mode or a rotating speed control mode, controlling the ISG motor to apply a back dragging torque according to a set rotating speed time two-dimensional table of the ISG motor when entering the rotating speed control mode, controlling the ISG motor to apply the back dragging torque according to a set torque time two-dimensional table of the ISG motor when entering the torque control mode, then executing a step S3, and if not, ending;
s3: judging whether the rotation speed of the ISG motor is less than a third fixed value V3If so, the ISG motor is caused to exit the energy recovery mode, otherwise, the process returns to step S2.
2. A hybrid heavy truck shutdown control method as recited in claim 1, wherein V is1Is 0.001 km/h.
3. The hybrid power heavy truck stop control method according to claim 1, wherein the set rotating speed time two-dimensional table is obtained through experiments, and the anti-drag torque applied by the ISG motor in real time is obtained through interpolation according to the set rotating speed time two-dimensional table.
4. The hybrid power heavy truck stop control method according to claim 1, wherein the set torque time two-dimensional table is obtained through experiments, and the anti-drag torque applied by the ISG motor in real time is obtained through interpolation according to the set torque time two-dimensional table.
5. The hybrid truck-mounted shutdown control method of claim 1, wherein in the step S2, the slope setting of the anti-drag torque and the anti-drag rotation speed of the ISG motor performing the energy recovery mode is determined according to a maximum generated power of the ISG motor and a maximum charged power of the battery.
6. A hybrid truck shutdown control method as recited in claim 1, wherein said second constant value V2Is 700r/min, the third constant value V3Is 100 r/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010232313.5A CN111361563B (en) | 2020-03-27 | 2020-03-27 | Hybrid power heavy truck stop control method |
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| CN202010232313.5A CN111361563B (en) | 2020-03-27 | 2020-03-27 | Hybrid power heavy truck stop control method |
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| CN111361563B true CN111361563B (en) | 2021-07-06 |
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| JP2018080581A (en) * | 2016-11-14 | 2018-05-24 | スズキ株式会社 | Device for controlling engine stop position |
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2020
- 2020-03-27 CN CN202010232313.5A patent/CN111361563B/en active Active
Patent Citations (7)
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| CN102806901A (en) * | 2011-05-30 | 2012-12-05 | 日产自动车株式会社 | Engine stop control system for hybrid electric vehicle |
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| CN111361563A (en) | 2020-07-03 |
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