CN114407865A - Engine start control method for hybrid vehicle and hybrid vehicle - Google Patents

Engine start control method for hybrid vehicle and hybrid vehicle Download PDF

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Publication number
CN114407865A
CN114407865A CN202210182645.6A CN202210182645A CN114407865A CN 114407865 A CN114407865 A CN 114407865A CN 202210182645 A CN202210182645 A CN 202210182645A CN 114407865 A CN114407865 A CN 114407865A
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China
Prior art keywords
clutch
engine
rotating speed
difference
speed
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CN202210182645.6A
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Chinese (zh)
Inventor
刘海亮
秦军超
李盈
丛强
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Honeycomb Transmission Technology Hebei Co Ltd
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Honeycomb Transmission Technology Hebei Co Ltd
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Priority to CN202210182645.6A priority Critical patent/CN114407865A/en
Publication of CN114407865A publication Critical patent/CN114407865A/en
Pending legal-status Critical Current

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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
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/02—Conjoint control of vehicle sub-units of different type or different function including control of driveline clutches
    • 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
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • 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
    • 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, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
    • B60W30/18—Propelling the vehicle
    • B60W30/18009—Propelling the vehicle related to particular drive situations
    • B60W30/18027—Drive off, accelerating from standstill
    • 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
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/02—Clutches
    • B60W2510/0208—Clutch engagement state, e.g. engaged or disengaged
    • B60W2510/0216—Clutch engagement rate
    • 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
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/06—Combustion engines, Gas turbines
    • B60W2510/0638—Engine speed
    • 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
    • B60W2710/0666—Engine torque

Abstract

The invention discloses an engine start control method of a hybrid vehicle and the hybrid vehicle, wherein the engine start control method of the hybrid vehicle comprises the following steps: controlling the engine to enter a rotating speed control mode in response to an engine starting instruction; acquiring the rotating speed of an engine and the rotating speed of a clutch; controlling the clutch to enter a slip control mode according to the difference value between the rotating speed of the engine and the rotating speed of the clutch, wherein in the slip control mode, the engine is controlled to be switched from the rotating speed control mode to a torque mode, the compression degree of the clutch is controlled according to the difference value between the rotating speed of the engine and the rotating speed of the clutch, and the engine is regulated through the compression degree of the clutch, so that the difference value between the rotating speed of the engine and the rotating speed of the clutch is smaller than a clutch closing threshold value; and controlling the clutch to close to complete the starting of the engine. By adopting the method, the closing time of the clutch can be accurately controlled, and the engine can be quickly started.

Description

Engine start control method for hybrid vehicle and hybrid vehicle
Technical Field
The invention relates to the technical field of vehicles, in particular to an engine starting control method of a hybrid vehicle and the hybrid vehicle.
Background
For hybrid vehicles such as P4 hybrid vehicles, the advantages of simple mechanism, no need of mechanical coupling, comprehensive working condition fuel saving and the like are increasingly paid attention. There is a more frequently used control of a hybrid vehicle, particularly for a P4 configuration hybrid vehicle, during a drive start: the engine output shaft speed is dragged by the starter, the clutch is engaged, and the engine power starts to intervene.
In the related technology, in the process of starting the running vehicle, the engine is started through the starter, then the engine is regulated according to the target rotating speed, when the rotating speed of the engine is close to the target rotating speed, the clutch is slowly closed, and the engine transmits power after the clutch is closed. However, in the starting process of the driving engine of the hybrid vehicle, because the speed of the engine for speed regulation is slow and the precision is poor, if the difference between the output rotating speed of the engine and the rotating speed of the driven clutch is very small to control the clutch to be combined, the engine needs to be regulated for a long time, so that the time of the starting process of the driving engine is prolonged, the intervention of the power of the engine is delayed, and the experience is poor; if the output rotating speed of the engine and the rotating speed of the passive clutch are required to be combined when the difference is large, although the speed regulation time of the engine can be shortened, the starting process of the driving engine and the intervention of the power of the engine can be completed early, the clutch is not subjected to sliding control due to the large difference between the output rotating speed of the engine and the rotating speed of the passive clutch, the running is easily caused, and the experience is poor.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide an engine start control method for a hybrid vehicle, by which the timing of clutch closing can be precisely controlled to achieve a quick engine start.
Another object of the present invention is to provide a hybrid vehicle.
It is a further object of the present invention to provide a computer storage medium.
In order to solve the above problem, an embodiment of a first aspect of the present invention provides an engine start control method of a hybrid vehicle, including: controlling the engine to enter a rotating speed control mode in response to an engine starting instruction; acquiring the rotating speed of an engine and the rotating speed of a clutch; controlling a clutch to enter a slip control mode according to the difference between the rotating speed of the engine and the rotating speed of the clutch, wherein in the slip control mode, the engine is controlled to be switched from the rotating speed control mode to a torque mode, and the compression degree of the clutch is controlled according to the difference between the rotating speed of the engine and the rotating speed of the clutch, so that the engine is regulated through the compression degree of the clutch, and the difference between the rotating speed of the engine and the rotating speed of the clutch is smaller than a clutch closing threshold value; controlling the clutch to close to complete the starting of the engine.
According to the engine start control method of the hybrid vehicle of the embodiment of the invention, in the process of regulating the speed of the engine after the engine is started, whether the clutch enters the slipping control mode is judged according to the difference value between the rotating speed of the engine and the rotating speed of the clutch, so that when the difference value between the rotating speed of the engine and the rotating speed of the clutch is determined to be larger, the clutch is not directly controlled to be closed, the clutch is controlled to enter the slipping control mode to avoid the problem of rush, the engine is controlled to be switched into the torque mode in the slipping control mode to output power, the problem of delaying the power intervention of the engine due to longer starting time of the engine is avoided, the driving experience is improved, meanwhile, the compression degree of the clutch is regulated according to the difference value between the rotating speed of the engine and the rotating speed of the clutch in the process, so that the engine is regulated according to the compression degree of the clutch, the difference between the rotating speed of the engine and the rotating speed of the clutch is reduced, the clutch is closed quickly, the speed regulation time of the engine is shortened, and the engine is started quickly.
In some embodiments, controlling the clutch into the slip control mode based on a difference between a rotational speed of the engine and a rotational speed of the clutch comprises: and if the difference value between the engine rotating speed and the clutch rotating speed is smaller than a clutch action threshold value and larger than the clutch closing threshold value, controlling the clutch to enter the slip control mode, wherein the clutch action threshold value is larger than the clutch closing threshold value.
In some embodiments, controlling the degree of compression of the clutch based on the difference between the speed of the engine and the speed of the clutch to throttle the engine by the degree of compression of the clutch comprises: obtaining a pressure control quantity by adopting a PID algorithm according to a difference value between the rotating speed of the engine and the rotating speed of the clutch; and controlling the compaction degree of the clutch according to the pressure control quantity so as to regulate the speed of the engine through the compaction degree of the clutch.
In some embodiments, controlling the degree of compression of the clutch as a function of the difference between the speed of the engine and the speed of the clutch to throttle the engine by the degree of compression of the clutch such that the difference between the speed of the engine and the speed of the clutch is less than the clutch-on threshold comprises: step S1, assigning the difference value between the rotating speed of the engine and the rotating speed of the clutch to a target rotating speed difference; step S2, performing PID calculation according to the difference between the rotational speed of the engine and the rotational speed of the clutch and the target rotational speed difference to obtain the pressure control amount; a step S4 of controlling a degree of compression of the clutch according to the pressure control amount to pass the degree of compression of the clutch; and step S4, acquiring the rotating speed of the engine and the rotating speed of the clutch again, acquiring a new target rotating speed difference according to the target rotating speed difference and a preset change amplitude, and returning to the step S2 until the difference value between the rotating speed of the engine and the rotating speed of the clutch is smaller than the clutch closing threshold value.
In some embodiments, obtaining a new target difference of rotational speeds according to the target difference of rotational speeds and a preset variation range includes: and taking the difference value between the target rotating speed difference and the preset change amplitude as the new target rotating speed difference.
In some embodiments, after controlling the engine to enter the speed control mode, the method further comprises: and when the difference value between the engine speed and the clutch speed is determined to be smaller than the clutch closing threshold value, controlling the clutch to be directly closed so as to finish the starting of the engine.
In some embodiments, the rotation speed control mode is a mode of controlling the rotation speed of the engine with a target rotation speed as a target.
An embodiment of a second aspect of the invention provides a hybrid vehicle including: an engine and a clutch; and a controller connected to the engine and the clutch for executing the engine start control method of the hybrid vehicle according to the above embodiment.
According to the hybrid vehicle provided by the embodiment of the invention, the engine starting control method of the hybrid vehicle provided by the embodiment is executed by the controller, so that the closing time of the clutch can be accurately controlled, and the engine can be quickly started.
In some embodiments, the hybrid vehicle is a P4 configuration hybrid vehicle.
An embodiment of a third aspect of the invention provides a computer storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the engine start control method of the hybrid vehicle described in the above embodiment.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a block diagram of a hybrid vehicle according to an embodiment of the invention;
fig. 2 is a flowchart of an engine start control method of a hybrid vehicle according to one embodiment of the invention;
fig. 3 is a control timing chart when the hybrid vehicle is in the slip control mode according to one embodiment of the invention;
fig. 4 is a flowchart of an engine start control method of a hybrid vehicle according to another embodiment of the invention.
Reference numerals:
the hybrid vehicle 10;
an engine 1; and a clutch 2.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
In the running starting process of the hybrid vehicle, when the engine is started, the output rotating speed of the engine is adjusted to the target rotating speed, the clutch is controlled to be closed, and the engine outputs power. However, since the speed of the engine is slow and the accuracy is poor, if the closing time of the clutch cannot be well controlled in the process, the driving experience is easily influenced.
In order to solve the above problems, embodiments of the first aspect of the present invention provide a method for controlling an engine start of a hybrid vehicle, which can reasonably control a timing of closing a clutch, avoid a problem of a rush while realizing a quick engine start, and improve driving experience.
The hybrid vehicle referred to in the embodiment of the invention is exemplified by a hybrid vehicle of P4 configuration, as shown in fig. 1, in which a hybrid vehicle 10 includes two power sources, which are respectively driven by an engine 1 at a front axle and a motor at a non-powered axle. And, for the drive mode of the hybrid vehicle 10, the hybrid vehicle 10 is driven by the rear axle motor when the hybrid vehicle 10 is in the pure electric mode; when the torque demand is excessive, the hybrid vehicle 10 performs a hybrid mode, i.e., controls the front axle engine 1 to start, and controls the clutch 2 to close, so that the engine is powered by the motor and the engine. Wherein the clutch 2 is located between the engine 1 and the gearbox.
Based on the architecture of the hybrid vehicle of the above embodiment, an engine start control method of the hybrid vehicle according to an embodiment of the invention is described below with reference to fig. 1, and as shown in fig. 1, the method includes at least steps S11-S14.
In step S11, the engine is controlled to enter a rotational speed control mode in response to an engine start command.
In an embodiment, the hybrid vehicle includes a HCU (hybrid control unit), during a driving start process of the hybrid vehicle, the hybrid control unit determines whether an engine needs to be started based on a current power demand of the hybrid system, specifically, the hybrid control unit may calculate the power demand of the hybrid system in real time according to collected system signals when the vehicle is driving, where the system signals include an accelerator pedal signal of the hybrid system, a driving speed of the vehicle, a driving gear of the vehicle, and the like, and the hybrid control unit may determine the current power demand according to the system signals, and further give an instruction whether an intervention of the engine is needed. And initiating an engine starting command when the hybrid control unit determines that the engine needs to be started through calculation, and controlling the engine to enter a rotating speed control mode by starting the hybrid vehicle to enter a program for starting the engine based on the request of the hybrid control unit, namely responding to the engine starting command.
In the embodiment, the rotating speed control mode is a mode for controlling the rotating speed of the engine by taking the target rotating speed as a target, namely, in the rotating speed control mode, the engine is controlled by taking the target rotating speed as the target to carry out self-speed regulation without correspondingly arranging a speed regulating motor. Wherein the target speed is a speed value determined based on a current power demand of the hybrid powertrain system.
In step S12, the rotation speed of the engine and the rotation speed of the clutch are acquired.
And step S13, controlling the clutch to enter a slip control mode according to the difference between the rotating speed of the engine and the rotating speed of the clutch, wherein in the slip control mode, the rotating speed control mode of the engine is controlled to be switched into a torque mode, the compression degree of the clutch is controlled according to the difference between the rotating speed of the engine and the rotating speed of the clutch, and the engine is regulated through the compression degree of the clutch so that the difference between the rotating speed of the engine and the rotating speed of the clutch is smaller than a clutch closing threshold value.
The slip control mode may be a control mode in which, when the engine cannot be completely closed and locked due to a speed difference between the engine speed and the clutch speed, the slip control between the engine and the clutch is controlled so that the clutch is closed and locked. The clutch closing threshold value is understood to be a threshold value for controlling the closing of the clutch, that is, when the difference between the engine speed and the clutch speed is less than the clutch closing threshold value, the closing of the clutch is directly controlled; and when the difference value between the rotating speed of the engine and the rotating speed of the clutch is not less than the clutch closing threshold value, the clutch is not controlled to be closed, and the speed of the engine is continuously regulated.
In the embodiment, based on the fact that only the rotating speed of the engine is controlled in the rotating speed control mode, the engine does not output power, and the engine outputs power in the torque mode, the rotating speed control mode of the engine is controlled to be switched into the torque mode while the clutch is controlled to enter the slip control mode, so that the hybrid vehicle is controlled to intervene in the power of the engine in the speed regulation process of the engine, the problem that the intervention of the power of the engine is delayed due to long starting time of the engine is solved, and the driving experience is improved.
Meanwhile, in order to avoid the problems of prolonged starting time and delayed intervention of the power of the engine caused by overlong speed regulation time of the engine and rushing caused by rapid combination of the clutch but inaccurate clutch slip control when the difference between the output rotating speed of the engine and the rotating speed of the clutch is larger, the embodiment of the invention controls the engine to automatically regulate the speed at a target rotating speed when the engine is in a rotating speed control mode, obtains the rotating speed of the engine and the rotating speed of the clutch in real time, judges whether to control the clutch to enter the slip control mode according to the difference between the rotating speed of the engine and the rotating speed of the clutch in the process of regulating the speed of the engine to the target rotating speed, and does not directly carry out the slip control on the clutch, thereby reducing the slip time of the clutch and prolonging the service life of the clutch, and can determine that the difference between the rotating speed of the engine and the rotating speed of the clutch is larger through the judgment mode, the clutch is not closed, but the clutch is controlled to enter a slip control mode, so that the rotating speed of the engine is adjusted by performing slip control on the clutch, the difference value between the rotating speed of the engine and the rotating speed of the clutch is reduced, the slip control on the clutch is accurately realized, and the problem of rushing is avoided.
And step S14, controlling the clutch to be closed to finish the starting of the engine, so that the engine outputs power, the driving requirement of the hybrid vehicle is met, and the user experience is improved.
According to the engine start control method of the hybrid vehicle of the embodiment of the invention, in the process of regulating the speed of the engine after the engine is started, whether the clutch enters the slipping control mode is judged according to the difference value between the rotating speed of the engine and the rotating speed of the clutch, so that when the difference value between the rotating speed of the engine and the rotating speed of the clutch is determined to be larger, the clutch is not directly controlled to be closed, the clutch is controlled to enter the slipping control mode to avoid the problem of rush, the engine is controlled to be switched into the torque mode in the slipping control mode to output power, the problem of delaying the power intervention of the engine due to longer starting time of the engine is avoided, the driving experience is improved, meanwhile, the compression degree of the clutch is regulated according to the difference value between the rotating speed of the engine and the rotating speed of the clutch in the process, so that the engine is regulated according to the compression degree of the clutch, the difference between the rotating speed of the engine and the rotating speed of the clutch is reduced, the clutch is closed quickly, the speed regulation time of the engine is shortened, and the engine is started quickly.
In some embodiments, the clutch is controlled to enter the slip control mode if it is determined that the difference between the rotational speed of the engine and the rotational speed of the clutch is less than a clutch actuation threshold and greater than a clutch closure threshold, wherein the clutch actuation threshold is greater than the clutch closure threshold. And after controlling the engine to enter the rotating speed control mode, controlling the clutch to be directly closed to finish the starting of the engine if the difference value between the rotating speed of the engine and the rotating speed of the clutch is smaller than the clutch closing threshold value.
The clutch actuation threshold may be a threshold for controlling the clutch to start to close but not completely close, that is, when a difference between the engine speed and the clutch speed is smaller than the clutch actuation threshold, the clutch is controlled to start to close, that is, the clutch is controlled to gradually close but not completely close, and the clutch is not completely closed until the difference between the engine speed and the clutch speed is smaller than the clutch closure threshold.
Specifically, in the process that the engine adjusts the speed to the target rotating speed, if the difference value between the rotating speed of the engine and the rotating speed of the clutch is greater than the action threshold value of the clutch, the difference value between the rotating speed of the engine and the target rotating speed is too large, under the condition, the engine continues to adjust the speed at the target rotating speed, the clutch cannot be controlled to execute any action, the clutch cannot be controlled to enter a slip state, the slip time of the clutch is reduced, and the service life of the clutch is prolonged; if the difference value between the rotating speed of the engine and the rotating speed of the clutch is smaller than the clutch action threshold value, controlling the clutch to start to close, and simultaneously judging whether the difference value between the rotating speed of the engine and the rotating speed of the clutch is smaller than the clutch closing threshold value, so as to judge whether the clutch is controlled to enter a slip control mode, if the difference value between the rotating speed of the engine and the rotating speed of the clutch is smaller than the clutch closing threshold value, controlling the clutch to directly close to complete the starting of the engine to realize the quick starting of the engine, otherwise, if the difference value between the rotating speed of the engine and the rotating speed of the clutch is larger than the clutch closing threshold value, controlling the clutch to enter a slip control mode to avoid the problem of rush caused by the fact that the clutch is quickly combined but the clutch is not accurately subjected to slip control when the difference value between the output rotating speed of the engine and the rotating speed of the clutch is larger than the rotating speed of the clutch. Therefore, the closing time of the clutch can be effectively and accurately controlled through the control mode, the engine can be quickly started, and the user experience is improved.
In some embodiments, a pressure control quantity is obtained by adopting a PID algorithm according to a difference value between the rotating speed of the engine and the rotating speed of the clutch, and then the compression degree of the clutch is controlled according to the pressure control quantity, so that the rotating speed of the engine is reduced through the compression degree of the clutch, and the purpose of regulating the speed of the engine is achieved. Therefore, the difference value between the rotating speed of the engine and the rotating speed of the clutch can be reduced more accurately, the rotating speed of the engine and the rotating speed of the clutch are synchronous, the condition that the clutch is closed is quickly achieved, the speed regulating time of the engine is shortened, and the engine is quickly started.
The PID algorithm is an algorithm which forms a control deviation according to a given value and an actual output value under closed-loop control, forms a control quantity by linearly combining the deviation according to proportion, integral and differential, and controls a controlled object.
In some embodiments, the PID algorithm is used for adjusting the compression degree of the clutch according to the difference value between the rotating speed of the engine and the rotating speed of the clutch, so that the speed of the engine is regulated through the compression degree of the clutch, and the difference value between the rotating speed of the engine and the rotating speed of the clutch is smaller than the clutch closing threshold value.
In step S1, the difference between the engine speed and the clutch speed is assigned to the target speed difference, for example, Δ v.
Specifically, let the rotational speed of the engine be denoted as v1, the rotational speed of the clutch be denoted as v2, the target rotational speed difference be denoted as v, and the expression formula for the target rotational speed difference v be v1-v 2.
In step S2, PID calculation is performed based on the difference between the engine speed and the clutch speed and the target speed difference v to obtain a pressure control amount. That is, the target rotational speed difference V is used as a given value of the PID algorithm, the difference Δ V between the rotational speed of the engine and the rotational speed of the clutch is used as an actual output value of the PID algorithm, a control deviation V is formed from the difference Δ V between the rotational speed of the engine and the rotational speed of the clutch and the target rotational speed difference V, that is, V- Δ V or V- Δ V-V, and the control deviation V is further formed into a pressure control amount by linear combination of proportional, integral and differential values to adjust the degree of pressing of the clutch.
And step S3, controlling the compression degree of the clutch according to the pressure control quantity so as to regulate the speed of the engine through the compression degree of the clutch. That is to say, according to the difference value between the difference value Δ v between the rotating speed of the engine and the rotating speed of the clutch and the target rotating speed difference v, the pressure at the two ends of the clutch is precisely controlled by adopting a PID algorithm, so that the pressure at the two ends of the clutch gradually rises, the compression degree of the clutch increases, the rotating speed of the engine gradually falls, and the difference value between the rotating speed of the clutch and the rotating speed of the engine gradually decreases, thereby finally, the clutch is rapidly closed without rushing.
And step S4, the rotating speed of the engine and the rotating speed of the clutch are obtained again, a new target rotating speed difference is obtained according to the target rotating speed difference and the preset change amplitude, and the step S2 is returned until the difference value between the rotating speed of the engine and the rotating speed of the clutch is smaller than the clutch closing threshold value. That is, before the difference between the rotating speed of the engine and the rotating speed of the clutch does not reach the condition of closing the clutch, the PID algorithm is adopted to circularly adjust the compression degree of the clutch, the difference between the rotating speed of the engine and the rotating speed of the clutch is continuously reduced to realize the synchronization of the rotating speed of the engine and the rotating speed of the clutch, meanwhile, the target rotating speed difference at the next cycle adjustment, namely a new target rotating speed difference, is calculated according to the target rotating speed difference at each adjustment and the preset change amplitude, the pressure at the two ends of the clutch is controlled by the difference value between the rotating speed of the engine and the rotating speed of the clutch and the new target rotating speed difference when the PID operation is carried out next time, the pressure at the two ends of the clutch can be gradually increased through circulation, the rotating speed of the engine is gradually reduced, and the difference value between the rotating speed of the clutch and the rotating speed of the engine is gradually reduced, so that the clutch is finally enabled to be rapidly closed and rushing is avoided.
The pressure at two ends of the clutch is feedforward pressure + P term pressure + I term pressure, the feedforward pressure is c torque of the engine, the P term pressure is a (delta v-v), the I term pressure is b (delta v-v), wherein a, b and c are constant value coefficients, delta v is the difference between the rotating speed of the engine and the rotating speed of the clutch, and v is a target rotating speed difference.
Therefore, the difference value between the rotating speed of the engine and the rotating speed of the clutch can be reduced more accurately through the steps, the rotating speed of the engine and the rotating speed of the clutch are synchronous, the condition that the clutch is closed is achieved quickly, the speed regulating time of the engine is shortened, and the engine is started quickly.
In some embodiments, the target rotational speed difference and the preset variation amplitude are recorded as v0Is recorded as v as the new target rotational speed differenceNewI.e. the target difference in rotational speed is controlled to gradually decrease according to a set gradient, i.e. a preset variation amplitude, the new target difference in rotational speed is the decreased target difference in rotational speed, vNew＝v-v0And the PID operation is circularly carried out on the difference value between the reduced target rotating speed difference and the rotating speed of the engine and the rotating speed of the clutch, the compression degree of the clutch is continuously adjusted according to the PID operation result, namely the pressure control quantity, and the rotating speed of the engine is controlled according to the compression degree of the clutch, so that the difference value between the rotating speed of the engine and the rotating speed of the clutch is gradually reduced, the difference value between the rotating speed of the engine and the rotating speed of the clutch is enabled to quickly reach the clutch closing condition, the clutch is quickly closed, and the problem of rushing is avoided.
An engine start control method of a hybrid vehicle according to an embodiment of the present invention will be described below by way of example with reference to fig. 3 and 4, and will be described in detail below.
In step S15, the hybrid vehicle of P4 configuration starts a process of starting the engine, i.e., the engine is started, based on the HCU request, and controls the engine to enter a rotational speed control mode so that the engine is governed according to a target rotational speed. As shown with reference to fig. 3, the engine starts at time t 0.
And step S16, determining that the difference value between the rotation speed of the engine and the rotation speed of the clutch is smaller than a clutch action threshold value, and controlling the clutch to start to close.
In step S17, the difference between the engine speed and the clutch speed is determined to be less than the clutch closing threshold, and step S18 is executed.
And step S18, controlling the clutch to close quickly.
In step S19, the difference between the engine speed and the clutch speed is determined to be greater than the clutch closing threshold, and step S20 is executed.
And step S20, controlling the clutch to enter a slip control mode, assigning the difference value delta v between the rotating speed of the engine and the rotating speed of the clutch to a target rotating speed difference, and gradually reducing the target rotating speed difference according to a preset change amplitude. As shown with reference to fig. 3, the clutch begins to enter the slip control mode at time t1-t2, and assigns a difference Δ v between the rotational speed of the engine and the rotational speed of the clutch to a target rotational speed difference during which the pressure across the clutch remains constant and the engine is in a started but power not output state; at time t2-t3, the target rotational speed difference gradually decreases, the pressure across the clutch gradually increases, and the engine speed gradually decreases.
And step S21, accurately controlling the pressure at two ends of the clutch by adopting PID according to the difference value between the target rotating speed difference and the delta v, so that the clutch is quickly closed and cannot generate rushing.
In step S22, the slip control mode is exited, as shown with reference to fig. 3, at time t3 the slip control mode is exited, and after time t3 the pressure across the clutch is stabilized, the difference Δ v between the rotational speed of the engine and the rotational speed of the clutch is also maintained stable, and the engine is also operated stably at a rotational speed close to the target rotational speed.
In summary, according to the engine start control method of the hybrid vehicle in the embodiment of the invention, during the start and stop of the engine during driving, a plurality of components of the engine, the motor and the clutch are jointly controlled by setting a reasonable joint control sequence and method, particularly, after the engine starts to start, the purpose that the engine can be quickly started and power can be quickly intervened is realized by accurately controlling the clutch in the start process of the engine, and meanwhile, when the difference between the output rotating speed of the engine and the rotating speed of the passive clutch is large, the clutch is controlled to enter a slip control mode to accurately control the slip of the clutch, so that the problem of rush is effectively avoided.
An embodiment of a second aspect of the invention provides a hybrid vehicle 10, as shown in fig. 1, including an engine 1, a clutch 2, and a controller 3 (not shown in the drawings).
The controller 3 is connected to the engine 1 and the clutch 2, and is configured to execute the engine start control method of the hybrid vehicle according to the embodiment. It should be noted that the specific implementation manner of the controller 3 according to the embodiment of the present invention is similar to the specific implementation manner of the engine start control method of the hybrid vehicle according to any of the above embodiments of the present invention, and please refer to the description of the method part specifically, and the description is omitted here for reducing redundancy.
According to the hybrid vehicle 10 of the embodiment of the invention, the controller 3 is used for executing the engine start control method of the hybrid vehicle provided by the embodiment, in the process of regulating the speed of the engine after starting the engine, the closing time of the clutch can be accurately controlled according to the difference value between the rotating speed of the engine and the rotating speed of the clutch, so that when the difference value between the rotating speed of the engine and the rotating speed of the clutch is determined to be larger, the clutch is not directly controlled to be closed, the clutch is controlled to enter the slip control mode to avoid the problem of rushing, the engine is controlled to be switched to the torque mode in the slip control mode to output power, the problem of delaying the intervention of the power of the engine due to longer starting time of the engine is avoided, the driving experience is improved, and meanwhile, the compression degree of the clutch is adjusted according to the difference value between the rotating speed of the engine and the rotating speed of the clutch in the process, therefore, the engine is regulated through the compression degree of the clutch, the difference value between the rotating speed of the engine and the rotating speed of the clutch is reduced, the clutch is closed quickly, the speed regulation time of the engine is shortened, and the engine is started quickly.
In some embodiments, the hybrid vehicle 10 is a P4 configuration hybrid vehicle.
An embodiment of a third aspect of the invention provides a computer storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the engine start control method of a hybrid vehicle provided by the above-described embodiment.
In the description of this specification, any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of custom logic functions or processes, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. An engine start control method of a hybrid vehicle, characterized by comprising:
controlling the engine to enter a rotating speed control mode in response to an engine starting instruction;
acquiring the rotating speed of the engine and the rotating speed of a clutch;
controlling a clutch to enter a slip control mode according to the difference between the rotating speed of the engine and the rotating speed of the clutch, wherein in the slip control mode, the engine is controlled to be switched from the rotating speed control mode to a torque mode, and the compression degree of the clutch is controlled according to the difference between the rotating speed of the engine and the rotating speed of the clutch, so that the engine is regulated through the compression degree of the clutch, and the difference between the rotating speed of the engine and the rotating speed of the clutch is smaller than a clutch closing threshold value;
controlling the clutch to close to complete the starting of the engine.
2. The engine start control method of a hybrid vehicle according to claim 1, wherein controlling a clutch to enter a slip control mode according to a difference between a rotation speed of the engine and a rotation speed of the clutch includes:
and determining that the difference value between the rotating speed of the engine and the rotating speed of the clutch is smaller than a clutch action threshold value and larger than a clutch closing threshold value, and controlling the clutch to enter the slip control mode, wherein the clutch action threshold value is larger than the clutch closing threshold value.
3. The engine start control method of a hybrid vehicle according to claim 2, wherein controlling the degree of compression of the clutch according to a difference between a rotation speed of the engine and a rotation speed of the clutch to regulate the engine by the degree of compression of the clutch includes:
obtaining a pressure control quantity by adopting a PID algorithm according to a difference value between the rotating speed of the engine and the rotating speed of the clutch;
and controlling the compaction degree of the clutch according to the pressure control quantity so as to regulate the speed of the engine through the compaction degree of the clutch.
4. The engine start control method of a hybrid vehicle according to claim 3, wherein controlling the degree of compression of the clutch according to the difference between the rotational speed of the engine and the rotational speed of the clutch to throttle the engine by the degree of compression of the clutch such that the difference between the engine rotational speed and the clutch rotational speed is less than the clutch-on threshold includes:
step S1, assigning the difference value between the rotating speed of the engine and the rotating speed of the clutch to a target rotating speed difference;
step S2, performing PID calculation according to the difference between the rotational speed of the engine and the rotational speed of the clutch and the target rotational speed difference to obtain the pressure control amount;
step S3, controlling the compression degree of the clutch according to the pressure control quantity so as to regulate the speed of the engine according to the compression degree of the clutch;
and step S4, acquiring the rotating speed of the engine and the rotating speed of the clutch again, acquiring a new target rotating speed difference according to the target rotating speed difference and a preset change amplitude, and returning to the step S2 until the difference value between the rotating speed of the engine and the rotating speed of the clutch is smaller than the clutch closing threshold value.
5. The engine start control method of a hybrid vehicle according to claim 4, characterized in that obtaining a new target rotational speed difference based on the target rotational speed difference and a preset variation width includes:
and taking the difference value between the target rotating speed difference and the preset change amplitude as the new target rotating speed difference.
6. The engine start control method of a hybrid vehicle according to claim 2, characterized in that after controlling the engine to enter a rotation speed control mode, the method further comprises:
and when the difference value between the engine speed and the clutch speed is determined to be smaller than the clutch closing threshold value, controlling the clutch to be directly closed so as to finish the starting of the engine.
7. The engine start control method of the hybrid vehicle according to any one of claims 1 to 6, characterized in that the rotation speed control mode is a mode in which the rotation speed of the engine is controlled with a target rotation speed as a target.
8. A hybrid vehicle, characterized by comprising:
an engine and a clutch;
a controller connected to the engine and the clutch for executing the engine start control method of the hybrid vehicle according to any one of claims 1 to 7.
9. The hybrid vehicle of claim 8, characterized in that the hybrid vehicle is a P4 configuration hybrid vehicle.
10. A computer storage medium having a computer program stored thereon, the computer program, when executed by a processor, implementing an engine start control method of a hybrid vehicle according to any one of claims 1-7.
CN202210182645.6A 2022-02-25 2022-02-25 Engine start control method for hybrid vehicle and hybrid vehicle Pending CN114407865A (en)

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