CN108372853B - Hybrid vehicle starting control method and system - Google Patents
Hybrid vehicle starting control method and system Download PDFInfo
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- CN108372853B CN108372853B CN201810162979.0A CN201810162979A CN108372853B CN 108372853 B CN108372853 B CN 108372853B CN 201810162979 A CN201810162979 A CN 201810162979A CN 108372853 B CN108372853 B CN 108372853B
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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
- B60W10/04—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
- 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
- B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
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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
- B60W10/10—Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
- B60W30/182—Selecting between different operative modes, e.g. comfort and performance modes
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- Electric Propulsion And Braking For Vehicles (AREA)
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Abstract
The invention discloses a hybrid vehicle starting control method and a system, wherein the method comprises the following steps: presetting a plurality of starting modes, wherein each starting mode has an applicable requested rotating speed range and an accelerator opening-requested rotating speed corresponding relation; acquiring the output rotating speed of a current power source; determining a current starting mode according to the output rotating speed of the power source and the applicable requested rotating speed range of each starting mode; and determining the requested rotating speed according to the current starting mode, the current accelerator opening and the accelerator opening-requested rotating speed corresponding relation. The torque more suitable for the expectation of the driver can be provided by the invention.
Description
Technical Field
The invention relates to the technical field of automobile manufacturing, in particular to a hybrid vehicle starting control method and system.
Background
Hybrid vehicles are currently an emerging direction in the automotive industry. By hybrid, it is meant that two power sources, a conventional internal combustion engine and an electric motor, are present within the vehicle. The starting request rotating speed is the rotating speed requirement of the gearbox on the power source in the starting stage, and the input rotating speed of the gearbox can be continuously close to the requested rotating speed. At different throttle openings, the driver's desired acceleration intention is different and, therefore, the desired torque of the gearbox is also different.
Since a hybrid vehicle has two power sources: the two power sources can work independently or jointly. Therefore, the state of the power source of the hybrid vehicle can be divided into three modes of the traditional mode (only the engine works), the pure mode (only the motor works) and the hybrid mode (the engine and the motor work simultaneously). Because the external characteristics of the engine and the external characteristics of the motor are completely different, the maximum torque output rotating speed range of the engine is 2400 rpm-3800 rpm, the maximum torque output rotating speed range of the motor is 1200 rpm-1600 rpm, when the engine is started in a traditional mode, if the requested rotating speed is too low, the engine cannot release torque meeting the requirement, when the engine is started in a pure electric mode, if the requested rotating speed is too high, the output torque of the motor is insufficient, and the driving experience of a driver is influenced.
Disclosure of Invention
The invention provides a hybrid vehicle starting control method and system, which solve the problem that the starting control process in the prior art cannot meet the actual requirement.
The invention provides a hybrid vehicle starting control method, which comprises the following steps:
presetting a plurality of starting modes, wherein each starting mode has an applicable requested rotating speed range and an accelerator opening-requested rotating speed corresponding relation;
acquiring the output rotating speed of a current power source;
determining a current starting mode according to the output rotating speed of the power source and the applicable requested rotating speed range of each starting mode;
and determining the requested rotating speed according to the current starting mode, the current accelerator opening and the accelerator opening-requested rotating speed corresponding relation.
Preferably, the take-off mode comprises:
a pure electric mode, a traditional mode and a hybrid mode;
the requested rotating speed range of the pure electric mode is 0-1800 rpm;
the requested rotation speed range of the conventional mode is 1700 to 2800 rpm;
the requested rotation speed range of the mixing mode is 1700 to 2800 rpm.
Preferably, during the start-up of the hybrid vehicle, the method further comprises:
monitoring the oil temperature of the clutch;
and performing pressure compensation on the clutch pressure according to the oil temperature and the oil temperature-pressure compensation relation of the clutch.
Preferably, when the clutch oil temperature is greater than the set oil temperature, the method further includes:
the clutch is disengaged by pressure compensation.
Preferably, after determining the requested rotational speed, the method further comprises:
determining a rotating speed adjusting step length according to the difference value of the requested rotating speed and the actual rotating speed;
and gradually changing the requested rotating speed according to the rotating speed adjusting period and the rotating speed adjusting step length.
Preferably, the determining the rotation speed adjustment step size according to the difference between the requested rotation speed and the actual rotation speed includes:
calibrating a rotating speed adjusting step length based on a difference value between the requested rotating speed and the actual rotating speed and the driving experience degree;
and adjusting the calibrated rotating speed adjusting step length according to the influence of the temperature on the output rotating speed of the power source.
Correspondingly, the invention also provides a hybrid vehicle starting control system, which comprises:
the output shaft of the engine is connected with one end of a motor shaft through the first clutch, and the other end of the motor shaft is connected with the gearbox through the second clutch;
the engine control unit sends the output rotating speed of the engine to the gearbox control unit;
the motor control unit takes the output rotating speed of the motor as the output rotating speed of the power source and sends the output rotating speed to the gearbox control unit;
the gearbox control unit stores a plurality of preset starting modes, a request rotating speed range applicable to each starting mode and a corresponding relation between accelerator opening and request rotating speed, and determines a current starting mode according to the output rotating speed of a power source and the request rotating speed range applicable to each starting mode in the starting process; and then determining the requested rotating speed according to the current starting mode, the current accelerator opening and the accelerator opening-requested rotating speed corresponding relation.
Preferably, the system further comprises: the temperature sensor is connected with the gearbox control unit and used for monitoring the oil temperature of the oil outlet of the clutch and sending the oil temperature to the gearbox control unit;
the gearbox control unit is also stored with an oil temperature-pressure compensation corresponding relation and is specifically used for performing pressure compensation on the clutch pressure according to the received oil temperature.
Preferably, the transmission control unit further stores a corresponding relationship between the rotational speed difference and the engine water temperature and the adjustment step length, and the transmission control unit is specifically configured to determine the rotational speed adjustment step length according to the corresponding relationship between the current rotational speed difference, the current engine water temperature and the rotational speed difference and the engine water temperature and the adjustment step length after determining the requested rotational speed, and gradually change the requested step length according to the rotational speed adjustment step length.
Preferably, the take-off mode comprises:
a pure electric mode, a traditional mode and a hybrid mode;
the requested rotating speed range of the pure electric mode is 0-1800 rpm;
the requested rotation speed range of the conventional mode is 1700 to 2800 rpm;
the requested rotation speed range of the mixing mode is 1700 to 2800 rpm.
The invention provides a hybrid vehicle starting control method and a hybrid vehicle starting control system, which comprise the following steps: presetting a plurality of starting modes, wherein each starting mode has an applicable requested rotating speed range and an accelerator opening-requested rotating speed corresponding relation; acquiring the output rotating speed of a current power source; determining a current starting mode according to the output rotating speed of the power source and the applicable requested rotating speed range of each starting mode; and determining the requested rotating speed according to the current starting mode, the current accelerator opening and the accelerator opening-requested rotating speed corresponding relation. The invention firstly determines the starting mode applicable to the current rotating speed, so that a power source can run on the premise of ensuring the output torque when starting, and then determines the current request rotating speed according to the corresponding relation between the accelerator opening and the request rotating speed in the current starting mode, thereby avoiding the condition that the output torque is not consistent with the torque expected by a driver because an engine or a motor works in an improper rotating speed interval.
Further, the hybrid vehicle starting control method and the hybrid vehicle starting control system provided by the embodiment of the invention can further monitor the oil temperature of the clutch, so that the pressure compensation can be performed on the pressure of the clutch according to the oil temperature and the oil temperature-pressure compensation relation of the clutch, and the abrasion of the hardware of the clutch and the reduction of the service life caused by the abnormal sliding friction of the clutch due to the jump of the output rotating speed caused by the switching of the power source are avoided.
Further, according to the hybrid vehicle starting control method and system provided by the embodiment of the invention, after the requested rotating speed is determined, the method further comprises the following steps: determining a rotating speed adjusting step length according to the difference value of the requested rotating speed and the actual rotating speed; and gradually changing the requested rotating speed according to the rotating speed adjusting period and the rotating speed adjusting step length. For example, when the pure electric mode starts, the driver steps on the accelerator too much, the torque of the motor cannot meet the requirement, and then the hybrid mode is adopted for power supply. At this time, a request rotational speed jump occurs, and abnormal noise of the engine due to the request rotational speed jump is likely to occur. The method provided by the invention can effectively prevent the phenomenon from generating.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a first flowchart of a hybrid vehicle launch control method provided in accordance with an embodiment of the present invention;
FIG. 2 is a second flowchart of a hybrid vehicle launch control method provided in accordance with an embodiment of the present invention;
FIG. 3 is a third flowchart of a hybrid vehicle launch control method provided in accordance with an embodiment of the present invention;
FIG. 4 is a flowchart of determining a step size for adjusting a rotational speed according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a first configuration of a hybrid vehicle launch control system according to an embodiment of the present invention;
fig. 6 is a second structural schematic diagram of the hybrid vehicle starting control system provided by the embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar parameters or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
The hybrid vehicle starting control method and the hybrid vehicle starting control system provided by the invention solve the problem that the output torque of the vehicle is possibly inconsistent with the expected torque of a driver in the starting process in the prior art, so as to improve the driving experience of the driver.
In order to better understand the technical scheme and technical effect of the present invention, the following detailed description will be made on specific embodiments with reference to a flow diagram. As shown in fig. 1, a first flowchart of a hybrid vehicle launch control method according to an embodiment of the present invention is provided, and the method may include the following steps:
in step S01, a plurality of start modes are set in advance, each start mode having a respective applicable requested rotation speed range and accelerator opening degree-requested rotation speed correspondence relationship.
In this embodiment, the starting mode and the requested rotation speed range applicable to each starting mode may be determined empirically or experimentally, and then the accelerator opening-requested rotation speed correspondence may be determined by means of calibration and the like.
In one embodiment, the launch mode comprises: a pure electric mode, a traditional mode and a hybrid mode; the requested rotating speed range of the pure electric mode is 0-1800 rpm; the requested rotation speed range of the conventional mode is 1700 to 2800 rpm; the requested rotation speed range of the mixing mode is 1700 to 2800 rpm. The above-mentioned basis for setting the requested rotation speed is: when the rotating speed of the motor exceeds 1800rpm, the maximum torque output rotating speed range of the motor is exceeded, the condition that the output torque of the motor is inconsistent with the expected torque of a driver can be caused, the maximum torque output rotating speed range of the engine is 2400 rpm-3800 rpm, and the problem can be improved by switching the starting mode. Wherein the existence of the overlapping region between 0 to 1800rpm and 1700 to 2800rpm can make the mode switching more smooth.
And step S02, acquiring the current power source output rotating speed.
In the present embodiment, the rotational speed of the power source output shaft may be acquired by a rotational speed sensor or the like. The rotation speed sensor may be connected to the engine control unit or other control units, and sends the rotation speed information to each controller and the like that require the rotation speed information through a CAN bus, which is not limited herein. That is, the rotation speed sensor may be the original rotation speed sensor of the vehicle, or may be a rotation speed sensor newly added, and is not limited herein. Preferably, the CAN bus is adopted to obtain the output rotating speed of the current power source.
And step S03, determining the current starting mode according to the power source output rotating speed and the applicable requested rotating speed range of each starting mode.
Specifically, which starting mode is adopted if the power source output rotation speed is within the rotation speed interval of which starting mode, and if the current power source output rotation speed is within an overlapped interval, for example, 1700rpm, the start of starting mode transition is started.
And step S04, determining the requested rotating speed according to the current starting mode, the current accelerator opening and the corresponding relation between the accelerator opening and the requested rotating speed.
In one embodiment, the requested speed may be determined by a table lookup.
Shown in table 1 is a comparison table of accelerator opening degree-requested rotation speed in the pure electric mode.
TABLE 1 Accelerator opening degree-requested rotation speed comparison table in pure electric mode
As shown in table 2, the accelerator opening-requested rotational speed map in the conventional mode is shown.
TABLE 2 Accelerator opening degree-requested rotation speed comparison table under traditional mode
As shown in table 3, the accelerator opening degree-requested rotational speed map in the conventional mode is shown.
TABLE 3 Accelerator opening degree-requested rotation speed comparison table in hybrid mode
In this embodiment, the accelerator opening-requested rotation speed correspondence relationship may be stored in the form of a map and/or a table, and the requested rotation speed corresponding to the current accelerator opening is determined by looking up the map and/or the table during use. Due to the fact that different starting modes correspond to different accelerator opening-requested rotating speed corresponding relations, the obtained requested rotating speed can better meet the actual requirements of a driver.
According to the hybrid vehicle starting control method, the starting mode suitable for the current rotating speed is determined firstly, so that a power source during starting can operate on the premise of ensuring the output torque, then the current requested rotating speed is determined according to the corresponding relation between the accelerator opening and the requested rotating speed in the current starting mode, and the situation that the output torque is not consistent with the torque expected by a driver due to the fact that an engine or a motor works in an improper rotating speed interval can be avoided.
Fig. 2 is a second flowchart of a hybrid vehicle launch control method according to an embodiment of the invention.
In this embodiment, during the starting of the hybrid vehicle, the method further includes:
step S21, the clutch oil temperature is monitored.
And step S22, performing pressure compensation on the clutch pressure according to the oil temperature of the clutch and the oil temperature-pressure compensation relation.
In this embodiment, this step plays a role in protecting the starting temperature, the heat in starting comes from the synchronous stage of starting, the larger the slip wear is, the longer the duration is, the more heat is generated, the more wear and the reduction in the service life of hardware such as the clutch are easily generated, the temperature control is performed by monitoring the temperature of the oil outlet of the clutch, and the rate control of clutch pressurization is performed based on different temperatures. When the temperature is too high, for example, the oil temperature is set to 130 ℃, the vehicle is abandoned, and the clutch is directly disengaged. Specifically, the pressure compensation value may be obtained by a look-up table, and in addition, when the oil temperature changes, the clutch target pressure may be changed and may be adjusted by the pressure compensation. As shown in table 4, is an oil temperature-pressure compensation gauge.
Table 4 oil temperature-pressure compensation meter
The clutch launch request pressure is the pressure to which the clutch torque request is converted + the pressure compensation.
According to the starting control method for the hybrid vehicle, provided by the embodiment of the invention, the oil temperature of the clutch can be monitored, so that the pressure compensation can be carried out on the pressure of the clutch according to the oil temperature and oil temperature-pressure compensation relation of the clutch, and the abrasion of the hardware of the clutch and the reduction of the service life of the clutch caused by the abnormal sliding friction of the clutch due to the jumping of the output rotating speed caused by the switching of a power source are avoided.
Fig. 3 is a third flowchart of a hybrid vehicle launch control method according to an embodiment of the invention.
In this embodiment, after determining the requested rotational speed, the method further comprises:
and step S31, determining a rotating speed adjusting step according to the difference value between the requested rotating speed and the actual rotating speed.
In this embodiment, in order to avoid engine abnormal noise caused by the jump of the rotation speed, the requested rotation speed adjustment may be performed by adjusting the rotation speed in a stepwise manner, and in addition, in order to avoid the generation of a hysteresis feeling caused by an excessively long time of the adjustment process, a large number of experiments are required to determine the rotation speed adjustment step. Preferably, the greater the difference in rotational speed, the greater the rotational speed adjustment step can be set, but the rotational speed adjustment step cannot be too great to cause a rotational speed step.
Step S32, the requested rotation speed is changed stepwise according to the rotation speed adjustment period and the rotation speed adjustment step size.
The hybrid vehicle starting control method provided by the embodiment of the invention can effectively avoid the internal abnormal sound of the engine caused by the rotating speed step, and can not cause torque lag.
Fig. 4 is a flowchart for determining a step size of a rotation speed adjustment according to an embodiment of the present invention.
In this embodiment, the determining the rotation speed adjustment step length according to the difference between the requested rotation speed and the actual rotation speed includes:
and step S41, calibrating the rotating speed adjusting step length based on the difference value between the requested rotating speed and the actual rotating speed and the driving experience degree.
And step S42, adjusting the calibrated rotating speed adjusting step according to the influence of the temperature on the output rotating speed of the power source.
In a specific embodiment, because power mode switching control exists in the starting process, if the accelerator is excessively stepped by a driver and the torque of a motor cannot meet the requirement when the pure electric mode is started, power is supplied in a hybrid mode. At this time, the starting request rotating speed changes due to different power modes, for example, the pure electric mode request rotating speed is 1600rpm, the hybrid mode intervenes, the request rotating speed is 2500rpm, and the rotating speed change control is performed in the TCU, so that abnormal sound of the engine generated by a request rotating speed step is prevented.
Defining each period, such as 10ms, with an upper and lower limit of the requested speed change rate of 50rpm, a calculation of a speed adjustment step size is determined based on the requested speed difference and the engine water temperature, thereby obtaining a new requested speed. As shown in table 5, a comparison table of the differential rotation speed-engine water temperature-rotation speed adjustment step size is shown.
TABLE 5 speed Difference-Engine Water temperature-speed adjustment step Length
| -20 | 10 | 40 | 80 | 120 | |
| -1000 | -20 | -20 | -20 | -35 | -50 |
| -500 | -15 | -15 | -15 | -25 | -45 |
| -200 | -10 | -10 | -10 | -20 | -40 |
| 0 | 0 | 0 | 0 | 0 | 0 |
| 200 | 10 | 10 | 10 | 20 | 40 |
| 500 | 15 | 15 | 15 | 25 | 45 |
| -1000 | 20 | 20 | 20 | 35 | 50 |
Wherein the vertical axis is the rotation speed difference, and the horizontal axis is the engine water temperature.
The rotation speed adjustment step length determining method and device provided by the embodiment of the invention can obtain the rotation speed adjustment step length meeting the expectation of a driver, and can prolong the service life of the clutch.
Correspondingly, the present invention further provides a hybrid vehicle starting control system corresponding to the above method, as shown in fig. 5, which is a first schematic structural diagram of a hybrid vehicle starting control system provided according to an embodiment of the present invention, and the hybrid vehicle starting control system may include:
the engine comprises an engine, a motor, a first clutch C0, a second clutch C1 and a gearbox, wherein an output shaft of the engine is connected with one end of a motor shaft through the first clutch C0, and the other end of the motor shaft is connected with the gearbox through the second clutch C1.
Wherein the engine control unit sends the engine output speed to the gearbox control unit. The motor control unit takes the output rotating speed of the motor as the output rotating speed of the power source and sends the output rotating speed to the gearbox control unit. The gearbox control unit stores a plurality of preset starting modes, a request rotating speed range applicable to each starting mode and a corresponding relation between accelerator opening and request rotating speed, and determines a current starting mode according to the output rotating speed of a power source and the request rotating speed range applicable to each starting mode in the starting process; and then determining the requested rotating speed according to the current starting mode, the current accelerator opening and the accelerator opening-requested rotating speed corresponding relation.
Preferably, the transmission control unit further stores a corresponding relationship between the rotational speed difference and the engine water temperature and the adjustment step length, and the transmission control unit is specifically configured to determine the rotational speed adjustment step length according to the corresponding relationship between the current rotational speed difference, the current engine water temperature and the rotational speed difference and the engine water temperature and the adjustment step length after determining the requested rotational speed, and gradually change the requested step length according to the rotational speed adjustment step length.
In one embodiment, during the hybrid vehicle launch, the power source has the following operating states:
1. in the electric-only mode, only the electric machine is operated, and the first clutch C0 is opened and the second clutch C1 is engaged.
2. In the conventional mode, only the engine is operated, and both the first clutch C0 and the second clutch C1 are engaged, but the motor does not output torque.
3. A mix mode. The motor and the engine operate simultaneously, with the first clutch C0 and the second clutch C1 engaged, and the engine and the motor output torque simultaneously.
In a specific embodiment, the launch mode may include: pure electric mode, conventional mode and hybrid mode.
Preferably, the requested rotation speed range of the pure electric mode is 0 to 1800 rpm.
The requested rotation speed range of the conventional mode is 1700 to 2800 rpm.
The requested rotation speed range of the mixing mode is 1700 to 2800 rpm.
The hybrid vehicle starting control system provided by the invention can effectively solve the problem that the torque provided by the power source can not meet the requirement of a driver in the starting process.
As shown in fig. 6, which is a second schematic structural diagram of a hybrid vehicle starting control system according to an embodiment of the present invention, the system may further include:
and the temperature sensor is connected with the gearbox control unit and used for monitoring the oil temperature of the oil outlet of the clutch and sending the oil temperature to the gearbox control unit.
The transmission control unit is used for performing pressure compensation on the clutch pressure according to the received oil temperature.
According to the hybrid vehicle starting control system provided by the embodiment of the invention, the oil temperature of the clutch can be monitored by adopting the temperature sensor, so that the pressure compensation can be carried out on the pressure of the clutch according to the oil temperature of the clutch and the oil temperature-pressure compensation relation, and the service life of the clutch is prolonged.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim.
Those skilled in the art will appreciate that the modules in the apparatus of an embodiment may be adaptively changed and disposed in one or more devices different from that of the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps or the like not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several systems, several of these systems may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Claims (8)
1. A hybrid vehicle launch control method, characterized by comprising:
presetting a plurality of starting modes, wherein each starting mode has an applicable requested rotating speed range and an accelerator opening-requested rotating speed corresponding relation;
acquiring the output rotating speed of a current power source;
determining a current starting mode according to the output rotating speed of the power source and the applicable requested rotating speed range of each starting mode;
determining a request rotating speed according to the current starting mode, the current accelerator opening and the accelerator opening-request rotating speed corresponding relation;
determining a rotating speed adjusting step length according to the difference value of the requested rotating speed and the actual rotating speed;
and gradually changing the requested rotating speed according to the rotating speed adjusting period and the rotating speed adjusting step length.
2. The method of claim 1, wherein the launch mode comprises:
a pure electric mode, a traditional mode and a hybrid mode;
the requested rotating speed range of the pure electric mode is 0-1800 rpm;
the requested rotation speed range of the conventional mode is 1700 to 2800 rpm;
the requested rotation speed range of the mixing mode is 1700 to 2800 rpm.
3. The method of claim 1, wherein during hybrid vehicle launch, the method further comprises:
monitoring the oil temperature of the clutch;
and performing pressure compensation on the clutch pressure according to the oil temperature and the oil temperature-pressure compensation relation of the clutch.
4. The method of claim 3, wherein when the clutch oil temperature is greater than the set oil temperature, the method further comprises:
the clutch is disengaged by pressure compensation.
5. The method of claim 1, wherein determining a speed adjustment step size based on the difference between the requested speed and the actual speed comprises:
calibrating a rotating speed adjusting step length based on a difference value between the requested rotating speed and the actual rotating speed and the driving experience degree;
and adjusting the calibrated rotating speed adjusting step length according to the influence of the temperature on the output rotating speed of the power source.
6. A hybrid vehicle launch control system, comprising:
the output shaft of the engine is connected with one end of a motor shaft through the first clutch, and the other end of the motor shaft is connected with the gearbox through the second clutch;
the engine control unit sends the output rotating speed of the engine to the gearbox control unit;
the motor control unit takes the output rotating speed of the motor as the output rotating speed of the power source and sends the output rotating speed to the gearbox control unit;
the gearbox control unit stores a plurality of preset starting modes, a request rotating speed range applicable to each starting mode and a corresponding relation between accelerator opening and request rotating speed, and determines a current starting mode according to the output rotating speed of a power source and the request rotating speed range applicable to each starting mode in the starting process; then determining a request rotating speed according to the current starting mode, the current accelerator opening and the accelerator opening-request rotating speed corresponding relation;
the gearbox control unit is specifically used for determining a rotating speed adjusting step length according to the corresponding relation among the current rotating speed difference, the current engine water temperature and the rotating speed difference, the engine water temperature and the rotating speed adjusting step length after determining the requested rotating speed, and gradually changing the requested step length according to the rotating speed adjusting step length.
7. The system of claim 6, further comprising: the temperature sensor is connected with the gearbox control unit and used for monitoring the oil temperature of the oil outlet of the clutch and sending the oil temperature to the gearbox control unit;
the gearbox control unit is also stored with an oil temperature-pressure compensation corresponding relation and is specifically used for performing pressure compensation on the clutch pressure according to the received oil temperature.
8. The system of claim 6, wherein the launch mode comprises:
a pure electric mode, a traditional mode and a hybrid mode;
the requested rotating speed range of the pure electric mode is 0-1800 rpm;
the requested rotation speed range of the conventional mode is 1700 to 2800 rpm;
the requested rotation speed range of the mixing mode is 1700 to 2800 rpm.
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| CN114962623B (en) * | 2022-05-17 | 2023-09-15 | 上汽通用五菱汽车股份有限公司 | Method, apparatus, computer device and readable storage medium for vehicle start control |
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| JP5167786B2 (en) * | 2007-11-29 | 2013-03-21 | 日産自動車株式会社 | Control device for hybrid vehicle |
| KR100992781B1 (en) * | 2007-12-13 | 2010-11-05 | 기아자동차주식회사 | System For Control Of Clutch Binding Of Hybrid Vehicle And Method Thereof |
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