CN110395246B

CN110395246B - Engine starting control method, device and equipment for hybrid vehicle and hybrid vehicle

Info

Publication number: CN110395246B
Application number: CN201910643588.5A
Authority: CN
Inventors: 张剑锋; 叶先军; 高明明; 陈继; 张毅华
Original assignee: Zhejiang Geely Holding Group Co Ltd; Geely Automobile Research Institute Ningbo Co Ltd
Current assignee: Zhejiang Geely Holding Group Co Ltd; Geely Automobile Research Institute Ningbo Co Ltd
Priority date: 2019-07-17
Filing date: 2019-07-17
Publication date: 2021-08-13
Anticipated expiration: 2039-07-17
Also published as: CN110395246A

Abstract

The invention discloses an engine starting control method, an engine starting control device and engine starting control equipment of a hybrid vehicle and the hybrid vehicle, wherein the method comprises the following steps: receiving an engine starting request, and driving an engine by using a driving motor; acquiring the rotating speed of the engine, the rotating speed acceleration of the engine and the rotating speed acceleration of a driving motor; when the rotating speed of the engine rises to a first preset rotating speed, outputting a first preset torque to the driving motor so as to control the rotating speed acceleration of the driving motor to be more than or equal to the rotating speed acceleration of the engine; the engine is started. In the process of starting the engine, the technical scheme provided by the invention can avoid knocking noise caused by quick reversing of the transmission surface, ensure the NVH quality of the driving motor in the process of starting the engine and improve the driving experience of a user.

Description

Engine starting control method, device and equipment for hybrid vehicle and hybrid vehicle

Technical Field

The invention relates to the technical field of internet communication, in particular to an engine starting control method, an engine starting control device and engine starting control equipment for a hybrid vehicle and the hybrid vehicle.

Background

Under the dual pressure of energy and environmental crisis, hybrid vehicles become a new trend of the automobile industry, and the hybrid vehicles adopt motors and traditional engines as power sources and have various running modes such as pure electric, pure fuel and hybrid, so that the starting mode and the transmission structure of the engines are greatly different from those of the traditional fuel vehicles.

The existing hybrid vehicle generally adopts a driving motor to start an engine, and an original 12V starting motor and a transmission structure thereof are eliminated, so that the starting quality of the engine is improved, and the production cost of the vehicle is reduced. However, the engine starting method still has many problems, for example, Noise, Vibration and Harshness (NVH) quality during starting is poor due to Noise Vibration and Harshness (Noise Vibration and Harshness) Noise and Vibration generated by gear knocking, driveline lash knocking, pre-shift operation and the like during starting, starting impact is large, and jerk is obvious. The problem results in poor engine starting quality of the existing hybrid vehicle, and the driving experience is influenced. There is therefore a need to improve existing engine starting approaches to improve the starting quality of the vehicle.

Disclosure of Invention

The invention provides an engine starting control method, device and equipment for a hybrid vehicle, which can improve the starting quality of the vehicle and improve the user experience.

In a first aspect, the present invention provides an engine start control method for a hybrid vehicle, the method comprising:

receiving an engine starting request, and driving an engine by using a driving motor;

acquiring the rotating speed of the engine, the rotating speed acceleration of the engine and the rotating speed acceleration of a driving motor;

when the rotating speed of the engine rises to a first preset rotating speed, outputting a first preset torque to the driving motor so as to control the rotating speed acceleration of the driving motor to be more than or equal to the rotating speed acceleration of the engine;

the engine is started.

In a second aspect, the present invention provides an engine start control apparatus for a hybrid vehicle, the apparatus including:

the driving torque control unit is used for receiving an engine starting request and driving the engine by using a driving motor;

the acquisition unit is used for acquiring the rotating speed of the engine, the rotating speed acceleration of the engine and the rotating speed acceleration of the driving motor;

the compensation torque control unit is used for outputting a first preset torque to the driving motor when the rotating speed of the engine rises to a first preset rotating speed so as to control the rotating speed acceleration of the driving motor to be more than or equal to the rotating speed acceleration of the engine;

an engine starting unit for starting the engine.

In a third aspect, the present invention provides an engine start control apparatus for a hybrid vehicle, comprising a processor and a memory, the memory having stored therein at least one instruction, at least one program, set of codes, or set of instructions, the at least one instruction, the at least one program, the set of codes, or the set of instructions being loaded and executed by the processor to implement the engine start control method described above

In a fourth aspect, the invention provides a hybrid vehicle including the engine start control apparatus or the engine start control device described above.

The invention provides a method, a device and equipment for controlling the starting of an engine of a hybrid vehicle, which have the following technical effects:

according to the invention, the compensation torque is increased by controlling the driving motor in the starting process of the engine, so that the driving motor is prevented from being dragged reversely in the process of ascending the rotating speed of the started engine, the knocking noise caused by quick reversing of the transmission surface is further avoided, the NVH quality of the driving motor in the process of starting the engine is ensured, and the driving experience of a user is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions and advantages of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic flow chart diagram illustrating an engine start control method for a hybrid vehicle according to an embodiment of the present invention;

FIG. 2 is an alignment chart of engine starting provided by an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an engine start control device according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or server that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Referring to fig. 1 and 2, a hybrid vehicle starting method is provided according to an embodiment of the present invention, fig. 1 is a schematic flow chart of the method, fig. 2 is a collinear chart of engine starting provided according to an embodiment of the present invention, in which curve a represents a motor torque, curve B represents a motor control mode, curve C represents a clutch torque, curve D represents an engine torque, and curve E represents a motor rotation speed. The present specification provides method steps as described in the examples or flowcharts, but may include more or fewer steps based on routine or non-inventive labor. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of orders and does not represent the only order of execution. When an apparatus, device, or system product in practice performs, it may perform in sequence or in parallel as the methods described in the embodiments or shown in the drawings. Specifically, as shown in fig. 1, the method may include:

s110: an engine start request is received.

In the embodiment of the present specification, the scenario of issuing the engine start request may include, but is not limited to, an initial start process after the hybrid vehicle is powered on, a driving process after the hybrid vehicle is powered on, and the hybrid vehicle is in an idle state.

S120: the driving motor is used for driving the engine.

In the embodiment, the hybrid vehicle can be provided with at least one driving motor and at least one engine, and the driving motor and the engine can drive the vehicle to run independently or together. The engine side can be provided with a first transmission system for hybrid vehicles to run, an engine independent driving side clutch can be arranged between the engine and the first transmission system, and the power of the engine can be transmitted to the first transmission system by closing the engine independent driving side clutch so as to drive the hybrid vehicles to run. A driving motor side clutch can be arranged between the engine and the driving motor, and the driving motor can transmit power to the engine to drive the engine to rotate by closing the driving motor side clutch. Of course, the driving motor side may be provided with a motor-only driving side clutch for transmitting power to the hybrid vehicle to drive the hybrid vehicle to travel.

In practical applications, after the engine start control device of the hybrid vehicle receives the engine start request, the state information of the driving system and the transmission system of the vehicle can be acquired, and the state information includes, but is not limited to, a clutch system state, a gear state, whether a driving motor is failed, whether an engine is failed, a power supply state, whether a power supply is failed, and the like. When detecting that the whole vehicle has no fault and/or the electric quantity of the power supply meets the requirement of starting the engine, the control device can respond to the engine starting request to judge whether the driving system and the transmission system meet the engine starting state; if the clutch state does not meet the preset clutch state, the engine single driving side clutch can be controlled to be disconnected and the driving motor side clutch can be controlled to be closed according to the clutch system state, and all gears of the driving motor can be switched to the neutral position according to the gear information; if the requirement is met, the power can be output to the driving motor to drive the engine.

In a specific embodiment, the control device can control the driving motor to move by sending a target torque instruction to the driving motor, and the driving motor can output torque to the engine through the driving motor side clutch and the transmission assembly so as to drive the engine to rotate and increase the speed.

In one embodiment, a target torque command is sent to the driving motor in response to an engine start request, wherein the target torque command may correspond to a large target torque value, such as the maximum value in the intrinsic output torque range of the driving motor, so as to ensure that the engine can obtain enough power to start rotating and rapidly rise to a certain rotating speed. After the engine starts to rotate, the target torque value sent to the driving motor starts to be reduced until the target torque value is 0, so that the rotation speed of the engine in the initial stage of rotation is prevented from being excessively high.

S130: and acquiring the rotating speed of the engine, the rotating speed acceleration of the engine and the rotating speed acceleration of the driving motor.

In the embodiment of the present specification, the method for obtaining the rotation speed of the engine may include, but is not limited to, measurement by a rotation speed sensor and engine temperature, and the like. The method for acquiring the rotating speed of the driving motor can include, but is not limited to, measurement by a magnetoelectric sensor, a hall sensor, a rotary transformer and the like. The rotational speed acceleration of the engine and the rotational speed acceleration of the drive motor may be obtained from the rotational speed of the engine and the rotational speed of the drive motor, respectively.

S140: when the rotating speed of the engine rises to a first preset rotating speed, outputting a first preset torque to the driving motor so as to control the rotating speed acceleration of the driving motor to be greater than or equal to the rotating speed acceleration of the engine. So, can prevent that the engine from reversely dragging driving motor and rotate, and then avoid the striking noise that quick switching-over and the reverse output of moment of torsion of driving surface caused between engine and driving motor.

In the embodiment of the present disclosure, the magnitude of the first preset torque is a time-varying value, and the magnitude of the first preset torque may be determined according to a preset analog curve. The preset simulation curve can be obtained through experimental data of hybrid vehicles with the same structure and parameters in the process of starting the engine; the first preset torque may be obtained according to the engine speed, the engine speed acceleration and the driving motor speed acceleration obtained in real time, for example, the first preset torque is controlled based on a PID algorithm.

In practical applications, the hybrid vehicle may be controlled to enter a pre-start state of fueling and ignition while outputting a first preset torque to the drive motor based on a first preset rotation speed. The pre-starting state may include the injector being controlled to inject fuel and the spark plug being controlled to inject fuel by the command to allow ignition fuel injection, or in practice, the spark plug may be controlled to initiate ignition first, and the injector may be controlled to inject fuel after the engine speed has risen to the first preset speed. The pre-start state may further include controlling the driving motor side clutch to start preparing for disengagement by a driving motor side clutch disengagement command in preparation for disengaging power transmission between the engine and the driving motor.

It is to be noted that a drive motor side clutch disengagement command may be issued based on the engine rising to the first preset rotational speed, the drive motor side clutch executing the command and starting disengagement, but in practice, a certain time is required from the execution of the command to complete disengagement, and there is still power transmission between the drive motor and the engine before the clutch is not completely disengaged (for example, during a certain period of time after starting the engine described below).

In practice, the first predetermined speed may be indicative of an engine speed at which the engine can be fueled and ignited. The first preset rotating speed can be changed according to different vehicle types and parameters.

In addition, in the embodiment of the present disclosure, the upper limit value of the first preset torque may be set, for example, the upper limit value does not exceed the compensation torque threshold, so that when the first preset torque meets the acceleration requirement, excessive power torque is not output to the engine, and the rotation speed of the engine is excessively increased, which may cause a start shock feeling.

Further, in the practical process, during the process of continuously outputting the first preset torque to the driving motor, the rotating speed of the engine can be enabled not to exceed the second preset rotating speed by setting the compensation torque threshold value.

It is noted that the first predetermined speed may be a speed range, for example, 600rpm to 800rpm, considering the actual operation of the engine in practical applications. Also, the above "when the rotational speed of the engine rises to the first preset rotational speed" may be understood as the rotational speed of the engine rises to a speed range represented by the first preset rotational speed for a certain amount of time.

In a specific embodiment, when the engine speed reaches a first preset speed, the target torque value sent to the driving motor may have been reduced to a small value or reduced to zero torque, and after the first preset torque is output to the driving motor, most of the power source of the rotational speed acceleration of the driving motor comes from the first preset torque.

In one embodiment, referring to fig. 2, the initial target torque value output to the driving motor is about 190 n.m, and when the driving motor torque decreases to about 55 n.m, a first preset torque is output to the driving motor (the process P1 in fig. 2 is the first preset torque output process).

S150: the engine is started.

In the embodiments described herein, starting the engine may include, but is not limited to, fueling the engine and igniting, where igniting and fueling the engine may be simultaneous or may be performed by first igniting and then fueling.

In practical application, when the engine is started, the heat energy supplied by fuel combustion is converted into mechanical energy to drive the engine to run up, the torque of the engine is rapidly increased, and reverse torque may be output to the motor, so that the engine drives the driving motor to rotate, and the transmission surface is reversed. For example, with gear drives, the drive flanks can shift in opposite directions, causing gear rattle, noise and vibration. The first preset torque output to the driving motor can compensate the reverse torque output to the driving motor by the engine in the process, so that the reversing of the transmission surface is avoided.

In addition, in the practical process, the ignition angle of the engine can be delayed, so that the torque generated by the engine in the process is small, and the problem is further avoided.

In a particular embodiment, starting the engine may lag the output of the first predetermined torque.

To sum up, through the first moment of torsion of predetermineeing to driving motor compensation to after preventing the starter motor, the engine goes up the in-process reverse drive motor rotational speed of dragging at the rotational speed and rises, and then avoids the knock noise that the driving face commutates fast and causes, ensures the NVH quality of driving motor starter motor process, improves user's the experience of driving.

Based on the above embodiments, in some embodiments, a part of the hybrid vehicle needs to be able to provide the driving force for the engine by using the driving motor in a state that the vehicle is stationary, for example, the driving motor can only drive the vehicle to run or drive the engine to start alone. Therefore, before the S120 step, the method may further include:

s1101: acquiring the speed information of the hybrid vehicle;

s1102: judging whether the speed of the hybrid vehicle is zero or not according to the speed information;

s1103: and if so, responding to the engine starting request, and executing the step of driving the engine by using the driving motor.

Based on the foregoing specific implementation, in some embodiments, the S120 may include: and controlling the driving motor to drive the engine based on a second preset torque so as to control the engine to rise to a first preset rotating speed within a first preset time period. Therefore, the engine is rotated through the second preset torque and is increased to the first preset rotating speed in a short time, so that the engine can pass through a resonance frequency band of the hybrid vehicle power assembly as soon as possible, the vibration of the engine in the process of increasing the rotating speed from zero to the first preset rotating speed is reduced, and the starting impact is reduced.

Specifically, the second preset torque may be a time-varying value or a fixed value.

In some embodiments, the second predetermined torque value may be determined from a simulated curve calibrated with experimental data. It may be determined according to a torque range that the drive motor can output, for example, a maximum value in the torque range may be selected as the second preset torque.

In other embodiments, the process of increasing the engine speed from zero to the first preset speed is defined as an initial driving process in which there is a starting vibration, and the starting vibration value is preferably not higher than a preset vibration standard value. The first preset time period may represent a time value required for the engine speed to increase from zero to a first preset speed when the preset vibration standard value is reached. Preferably, the second preset torque may be obtained according to the first preset time period and a first preset rotation speed.

Based on the foregoing specific embodiments, in some embodiments, after the step S150, the method may further include:

s1601: and when the rotating speed acceleration of the engine is reduced to be less than or equal to a first preset acceleration, stopping outputting the first preset torque for the driving motor.

In practical applications, after the engine is started, the rotating speed and the rotating speed acceleration of the engine undergo a rising and falling process, that is, the rotating speed and the rotating speed acceleration gradually decrease after rising to the maximum value. The first preset acceleration may be indicative that the torque output from the engine to the driving motor cannot reverse the driving surface or there is no output torque between the engine and the driving motor in the case where there is no external torque input to the driving motor. Therefore, when the engine speed acceleration rises and then falls to be less than or equal to the first preset acceleration, the output of the first preset torque to the driving motor can be stopped.

S1602: and outputting a first preset reverse torque to the driving motor to control the driving motor to reduce the rotating speed based on a preset acceleration within a second preset time period.

In practical application, after the first preset torque is stopped being output to the driving motor, the rotation speed of the driving motor needs to be reduced through active speed regulation so as to meet operation requirements of a hybrid vehicle such as gear shifting. Wherein the active speed regulation process can be realized by outputting a reverse torque to the driving motor.

As described above, the drive motor side clutch may be controlled to start disengaging based on the first preset rotation speed of the engine. In practice, after the output of the compensation torque to the drive motor is stopped, the clutch may not be completely disengaged, and there is still torque transmission between the engine and the drive motor. Thus, in the initial stage of the active speed regulation, before the clutch completes the disconnection operation, the rapid reduction of the rotation speed of the driving motor can also cause the commutation of the transmission surface, resulting in knocking noise and vibration. Therefore, when the active speed regulation is started, a small reverse torque can be output to the driving motor to control the driving motor to reduce the speed at a small acceleration, and the transmission surface between the engine and the driving motor is prevented from reversing in the separation process of the clutch.

In some embodiments, the second preset time period may be equal to or greater than a time period from the start of the output of the first preset reverse torque to the completion of the disconnection operation of the drive side clutch. The second preset time period and the first preset reverse torque can be obtained by calibrating starting experiment data, and can also be determined by monitoring the state of a clutch on the side of the driving machine, the rotating speed acceleration of the engine and the rotating speed acceleration of the driving motor in real time.

In some embodiments, the predetermined acceleration may be indicative of the highest acceleration of the drive motor that avoids commutation of the drive surfaces during a deceleration of the drive motor when torque transfer between the engine and the drive motor is still present. The second preset time period and the first preset reverse torque may be determined according to a preset acceleration.

In one embodiment, referring to fig. 2, after the first predetermined compensation torque is stopped, a reverse torque (first predetermined reverse torque) of about-3 n.m is output to the driving motor during a period from t1 to t2 (a second predetermined time period) in fig. 2, and the rotation speed of the driving motor is slowly decreased during the time period, referring to the process P2 in fig. 2.

S1603: and outputting a second preset reverse torque to the driving motor to control the rotating speed of the driving motor to be reduced to a preset rotating speed range.

In a specific embodiment, the second preset reverse torque may be output to the driving motor after the clutch on the driving side finishes the disconnection operation or after the second preset time period ends. The second preset reverse torque value is greater than the first preset reverse torque value.

In practical applications, after the engine is started, the hybrid vehicle may have a drive request, such as pre-engaged 2 on the electric machine side or the hybrid vehicle needs to start driving. The preset rotating speed range can represent the rotating speed range which is required to be achieved by the driving motor and can meet the gear-shifting requirement of the hybrid vehicle.

Specifically, the preset rotation speed range is greater than or equal to zero and less than or equal to the gear-shifting rotation speed threshold.

In the actual process, a gear-in request is received, and after the active speed regulation process of the driving motor is finished, gear-in or pre-gear-shifting operation is started to be executed, and a synchronizer of the hybrid vehicle starts to synchronize. In the process, when the rotating speed of the motor is negative or too high, synchronous noise can be generated, and pre-gear engagement or gear engagement noise can be reduced by controlling the rotating speed of the driving motor to be more than or equal to zero and less than or equal to the gear engaging rotating speed threshold value. Preferably, it may include, but is not limited to, closed-loop control of the rotational speed of the drive motor based on a PID algorithm.

In one embodiment, the forward speed threshold may be 10rpm, as in the P3 process of FIG. 2.

It should be noted that, in an ideal state, after the active deceleration process of the driving motor is finished, the driving motor can reach a zero rotation speed and zero output torque state. However, in actual control, the over-large reverse torque output to the driving motor can cause speed reduction overshoot, so that the driving motor is reduced to a negative rotating speed; or the driving motor side clutch can not reach a complete separation state after the disconnection operation is finished due to intrinsic defects of equipment, dragging torque exists between the engine and the driving motor at the moment, and the speed reduction of the driving motor is not in place due to too small reverse torque, so that the rotating speed of the driving motor is too high. By the method, the problems can be avoided, and the gear noise and the pause can be reduced.

An embodiment of the present invention further provides an engine start control device for a hybrid vehicle, including a processor and a memory, where the memory stores at least one instruction, at least one program, a code set, or a set of instructions, and the at least one instruction, the at least one program, the code set, or the set of instructions is loaded and executed by the processor to implement the engine start control method.

In the embodiments of the present disclosure, the memory may be used to store software programs and modules, and the processor executes various functional applications and data processing by operating the software programs and modules stored in the memory. The memory can mainly comprise a program storage area and a data storage area, wherein the program storage area can store an operating system, application programs needed by functions and the like; the storage data area may store data created according to use of the apparatus, and the like. Further, the memory may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. Accordingly, the memory may also include a memory controller to provide the processor access to the memory.

An embodiment of the present invention further provides an engine start control apparatus for a hybrid vehicle, as shown in fig. 3, the apparatus including:

a driving torque control unit 210 for receiving an engine start request and driving the engine by using the driving motor;

an obtaining unit 220, configured to obtain a rotation speed of the engine, a rotation speed acceleration of the engine, and a rotation speed acceleration of the driving motor;

a compensation torque control unit 230, configured to output a first preset torque to the driving motor when the rotation speed of the engine increases to a first preset rotation speed, so as to control the rotation speed acceleration of the driving motor to be greater than or equal to the rotation speed acceleration of the engine;

an engine starting unit 240 for starting the engine.

In some embodiments, the driving torque control unit 210 may be further configured to: and controlling the driving motor to drive the engine based on a second preset torque so as to control the engine to rise to a first preset rotating speed within a first preset time period.

In some embodiments, the compensation torque control unit 230 may be further configured to: and when the rotating speed acceleration of the engine is reduced to be less than or equal to a first preset acceleration, stopping outputting the first preset torque for the driving motor.

In some embodiments, the apparatus further comprises: and the motor deceleration control unit is used for outputting a first preset reverse torque to the driving motor in a second preset time period so as to control the driving motor to decelerate based on a preset acceleration.

In some embodiments, the motor deceleration control unit is further configured to: outputting a second preset reverse torque to the driving motor to control the rotating speed of the driving motor to be reduced to a preset rotating speed range; the preset rotating speed range is greater than or equal to zero and less than or equal to a gear-shifting rotating speed threshold value.

In some embodiments, the apparatus further comprises: the vehicle speed judging unit is used for acquiring vehicle speed information of the hybrid vehicle; and judging whether the speed of the hybrid vehicle is zero or not according to the speed information.

Further, the driving torque control unit 210 is further configured to: and if so, responding to the engine starting request, and executing the step of driving the engine by using the driving motor.

The device and method embodiments in the device embodiment described are based on the same inventive concept.

It should be noted that: in the device or apparatus embodiments in the present description, the device or apparatus may be provided independently from the control system of the hybrid vehicle, or may be provided based on the control system of the hybrid vehicle. The control system of the hybrid vehicle can comprise, but is not limited to, a whole vehicle control module, an engine electronic control module, a transmission control module, a motor control module and the like which are in communication connection with each other.

As can be seen from the above-mentioned embodiments of the engine starting method, apparatus or device for a hybrid vehicle according to the present invention, the present invention avoids the commutation of the transmission surface between the engine and the driving motor by outputting the compensation torque (the first preset torque) to the driving motor, and prevents the rotation speed from dropping during the engine starting process. Meanwhile, the torque value output to the engine by the driving motor, the reverse torque value output to the driving motor, the compensation torque value and the like are controlled, so that starting impact vibration and noise, transmission surface reversing knocking noise, gear shifting noise and the like in the starting process of the engine of the hybrid vehicle are reduced or avoided, the NVH quality in the starting process of the engine of the hybrid vehicle is improved, and the driving experience of a user is provided.

It should be noted that: the precedence order of the above embodiments of the present invention is only for description, and does not represent the merits of the embodiments. And specific embodiments thereof have been described above. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus and device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference may be made to some descriptions of the method embodiments for relevant points.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. An engine start control method of a hybrid vehicle, characterized by comprising:

when the rotating speed of the engine rises to a first preset rotating speed, an oil injection permission instruction is sent to the engine, a first preset torque is output to the driving motor, so that the rotating speed acceleration of the driving motor is controlled to be larger than or equal to the rotating speed acceleration of the engine, the driving motor is prevented from being dragged to rotate reversely after ignition, and the first preset rotating speed is used for representing the rotating speed of the engine which can supply fuel to the engine and ignite;

starting the engine;

stopping outputting the first preset torque for the driving motor when the rotating speed acceleration of the engine is reduced to be less than or equal to a first preset acceleration;

and outputting a first preset reverse torque to the driving motor to control the driving motor to reduce the rotating speed based on a preset acceleration within a second preset time period, wherein the second preset time period is greater than or equal to the time period from the first preset reverse torque to the time when the clutch on the driving machine side finishes the disconnection operation, so that the transmission surface between the engine and the driving motor is prevented from being reversed in the clutch separation process.

2. The method of claim 1, wherein the driving an engine with a drive motor comprises:

and controlling the driving motor to drive the engine based on a second preset torque so as to control the engine to rise to a first preset rotating speed within a first preset time period.

3. The method of claim 1, wherein after outputting a first preset reverse torque to the driving motor to control the driving motor to reduce a rotation speed based on a preset acceleration, the method further comprises:

outputting a second preset reverse torque to the driving motor to control the rotating speed of the driving motor to be reduced to a preset rotating speed range;

the preset rotating speed range is greater than or equal to zero and less than or equal to a gear-shifting rotating speed threshold value.

4. The method of claim 1, wherein prior to said driving the engine with the drive motor, the method further comprises:

acquiring the speed information of the hybrid vehicle;

judging whether the speed of the hybrid vehicle is zero or not according to the speed information;

and if so, responding to the engine starting request, and executing the step of driving the engine by using the driving motor.

5. An engine start control apparatus of a hybrid vehicle, characterized by comprising:

the compensation torque control unit is used for sending an oil injection permission instruction to the engine and outputting a first preset torque to the driving motor when the rotating speed of the engine rises to a first preset rotating speed, so that the rotating speed acceleration of the driving motor is controlled to be larger than or equal to the rotating speed acceleration of the engine, the driving motor is prevented from being dragged to rotate reversely after ignition is carried out, and the first preset rotating speed is used for representing the rotating speed of the engine which can supply fuel to the engine and carry out ignition;

an engine starting unit for starting the engine;

the compensation torque control unit is further used for stopping outputting the first preset torque for the driving motor when the rotating speed acceleration of the engine is reduced to be smaller than or equal to a first preset acceleration;

and the motor deceleration control unit is used for outputting a first preset reverse torque to the driving motor to control the driving motor to decelerate based on a preset acceleration in a second preset time period, and the second preset time period is greater than or equal to the time period from the output of the first preset reverse torque to the completion of the disconnection operation of the clutch at the driving machine side, so that the transmission surface reversing between the engine and the driving motor is avoided in the clutch separation process.

6. The apparatus of claim 5, wherein the drive torque control unit is further configured to:

7. An engine start control apparatus of a hybrid vehicle, comprising a processor and a memory, characterized in that the memory has stored therein at least one instruction that is loaded and executed by the processor to implement the engine start control method according to any one of claims 1 to 4.

8. A hybrid vehicle characterized by comprising the engine start control apparatus recited in any one of claims 5 to 6 or the engine start control device recited in claim 7.