WO2022094902A1

WO2022094902A1 - Engine cranking control method and device for hybrid vehicle

Info

Publication number: WO2022094902A1
Application number: PCT/CN2020/126980
Authority: WO
Inventors: 罗品奎; 吕正涛
Original assignee: 舍弗勒技术股份两合公司; 罗品奎
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2022-05-12
Also published as: DE112020007761T5; CN116472211A

Abstract

An engine cranking control method and device for a hybrid vehicle. The hybrid vehicle comprises an engine, a drive motor, and a clutch provided between the engine and the drive motor. Said method comprises: a determination step, used for determining, after completing the current cranking of the engine, whether the clutch torque capacity adaptive amount needs to be adjusted for the current cranking of the engine; and an adjustment step, used for adjusting, if it is determined that the clutch torque capacity adaptive amount needs to be adjusted, the clutch torque capacity adaptive amount according to cranking time data of the engine in the current cranking, and storing the adjusted clutch torque capacity adaptive amount, the adjusted clutch torque capacity adaptive amount being used for the next cranking of the engine. Thus, a target clutch torque capacity to be used in the next cranking of the engine is always rational, so that the engine revolution speed can reach a threshold revolution speed in time in the next cranking of the engine, and an engine cranking process can be completed in time.

Description

Engine start control method and device for hybrid electric vehicle

technical field

The present invention relates to the technical field of hybrid electric vehicles, in particular to a method and device for controlling engine startup of a hybrid electric vehicle.

Background technique

FIG. 1 is a schematic structural diagram of a powertrain of a hybrid vehicle in the related art. As shown in Figure 1, the hybrid vehicle includes an engine, a P2 module and a gearbox (English: Gearbox). The P2 module includes a k0 clutch (English: Clutch) and a drive motor, the P2 module is located between the engine and the gearbox, and the k0 clutch is located between the engine and the drive motor.

FIG. 2 is a schematic diagram of an engine start-up process of a hybrid vehicle having a P2 module in the related art. As shown in Fig. 2, the engine starting process goes through stages P1, P2 and P3 in sequence. During the entire engine starting process, the state of the engine (that is, the operating state issued by the engine's controller) is in turn the stop state (English: stop), startup status (English: crank) and running status (English: run).

As shown in Figure 2, in phase P1, the clutch torque capacity is increased at a reasonable rate to the constant clutch torque capacity M, and the K0 clutch is partially engaged to deliver this constant clutch torque capacity to the engine, thereby adjusting the engine speed below the drive motor Threshold rotational speed of the rotational speed, during which the engine torque capacity is 0 because the engine has not been started; when the engine rotational speed is higher than the threshold rotational speed, phase P2 is entered.

In phase P2, the engine is started (fired) and the clutch torque capacity is reduced at a reasonable rate until the clutch is fully open, thereby preventing vehicle jerk from subsequent direct clutch engagement. Since the engine has been started, the engine torque capacity is not 0, and the engine speed is adjusted by the engine torque capacity.

In phase P3, the clutch torque capacity is increased at a reasonable rate, the K0 clutch is partially engaged to transfer clutch torque capacity to the engine to adjust the engine speed close to the drive motor speed, and the clutch is fully engaged when the engine speed is approximately the same as the drive motor speed , the engine speed curve and the drive motor speed curve basically overlap, that is, the engine speed synchronization process is performed.

However, in some cases, for example, the friction torque of the engine is larger than average due to the low temperature of the cooling water, or the actual torque of the K0 clutch is smaller than the required torque due to severe wear, the resultant force pulling the engine speed becomes less than normal, which results in it taking more time for the engine speed to reach the threshold speed, causing the total time for the engine start process to be delayed. What's more, in some extreme cases, because the engine friction torque is greater than the actual torque of the K0 clutch, the engine speed cannot even be increased, resulting in the failure to start the engine successfully.

Schematically, FIG. 3 is a schematic diagram of the engine starting process of a hybrid electric vehicle with a P2 module in the related art. As shown in FIG. 3 , it takes more time to make the engine speed reach the threshold speed, and the moment when the engine starts From P2' to P2, the timing at which the engine speed reaches the drive motor speed is delayed accordingly.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome or at least alleviate the above-mentioned deficiencies of the prior art, and to provide an engine startup control method and device for a hybrid vehicle.

According to an aspect of the present invention, there is provided an engine start control method for a hybrid vehicle, the hybrid vehicle includes an engine, a drive motor, and a clutch provided between the engine and the drive motor, the method Including: a judging step for judging whether it is necessary to adjust the clutch torque capacity adaptation amount for the current starting of the engine after the current start of the engine is completed; an adjustment step for adjusting the The clutch torque capacity adaptation amount, the clutch torque capacity adaptation amount is adjusted according to the starting time data of the engine in this start, and the adjusted clutch torque capacity adaptation amount is stored, wherein the adjusted clutch torque capacity The adaptation amount is used for the next start of the engine.

According to another aspect of the present invention, an engine start control device for a hybrid vehicle is provided, the hybrid vehicle includes an engine, a drive motor, and a clutch provided between the engine and the drive motor, the The device includes: a judgment module for judging whether it is necessary to adjust the clutch torque capacity adaptation for this start of the engine after this start of the engine is completed; an adjustment module for judging if the judgment module judges In order to adjust the clutch torque capacity adaptation amount, the clutch torque capacity adaptation amount is adjusted according to the starting time data of the engine in this startup, and the adjusted clutch torque capacity adaptation amount is stored, wherein the adjustment is performed. The rear clutch torque capacity adaptation is used for the next start of the engine.

According to the engine startup control method and device of the hybrid vehicle of the present invention, the target clutch torque capacity to be used in the next startup of the engine is always reasonable, so that the engine speed can reach the threshold value in time in the next startup of the engine speed, and then the engine start-up process can be completed in time.

Other features and aspects of the present invention will become apparent from the following detailed description of exemplary embodiments with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features and aspects of the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic structural diagram of a powertrain of a hybrid vehicle in the related art.

FIG. 2 is a schematic diagram of an engine start-up process of a hybrid vehicle having a P2 module in the related art.

FIG. 3 is a schematic diagram of an engine starting process of a hybrid vehicle having a P2 module in the related art.

FIG. 4 is a flow chart of a method for controlling engine startup of a hybrid vehicle according to an exemplary embodiment.

FIG. 5 is a schematic diagram of an engine startup process to which the engine startup control method of the hybrid vehicle of the present embodiment is applied.

FIG. 6 is a schematic diagram showing start-up time according to an exemplary embodiment.

FIG. 7 is a flowchart of a method for controlling engine startup of a hybrid vehicle according to an exemplary embodiment.

FIG. 8 is a block diagram of an engine starting control device of a hybrid vehicle according to an exemplary embodiment.

Detailed ways

Various exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. The same reference numbers in the figures denote elements that have the same or similar functions. While various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

In addition, in order to better illustrate the present invention, numerous specific details are given in the following detailed description. It will be understood by those skilled in the art that the present invention may be practiced without certain specific details. In other instances, methods, means, components and circuits well known to those skilled in the art have not been described in detail so as not to obscure the subject matter of the present invention.

It should be understood that, as described in the background art section, the present invention recognizes the following technical problems: when the friction torque of the engine is greater than the average value due to the low temperature of the cooling water, or the actual torque of the clutch caused by severe wear is smaller than the engine In the case of the torque required for starting, etc., it takes more time for the engine speed to reach the threshold speed, and the total time for the engine starting process is delayed.

As shown in FIGS. 2 and 3 , at each start of the engine, when the torque capacity of the clutch reaches the target clutch torque capacity M and the engine speed reaches a threshold speed, the fuel supply to the engine is started. In one possible implementation, the target clutch torque capacity may be calculated based on the clutch base torque capacity and the clutch torque capacity adaptation. Therefore, one of the factors affecting the total engine start processing time is the clutch torque capacity adaptation.

Based on this, in the present invention, each time the current start of the engine is completed, self-learning is performed on the clutch torque capacity adaptation amount used in the current start, so as to adapt to the clutch torque capacity used for the current start of the engine amount to determine the clutch torque capacity adaptation for the next start of the engine.

Therefore, in the present invention, self-learning is performed on the clutch torque capacity adaptation amount used in each start of the engine to determine the clutch torque capacity adaptation amount to be used in the next start of the engine, so that the engine can be ensured The clutch torque capacity adaptation to be used in the next start is reasonable, and the basic clutch torque capacity is corrected by using a reasonable clutch torque capacity adaptation, so that the target clutch torque capacity to be used in the next start of the engine is reasonable , so that the engine speed can reach the threshold speed in time, and then the engine startup process can be completed in time.

For a better understanding of the present invention, the following detailed description is given in conjunction with the flowchart shown in FIG. 4 .

FIG. 4 is a flowchart showing a method for controlling engine start of a hybrid electric vehicle according to an exemplary embodiment. The hybrid electric vehicle may be an HEV or a PHEV, and the structure of the powertrain of the hybrid electric vehicle may adopt the structure shown in FIG. 1 . Specifically, the hybrid vehicle includes an engine, a drive motor, and a clutch disposed between the engine and the drive motor, and the control method can be applied to a hybrid control unit of a hybrid vehicle (English: Hybrid Control Unit, referred to as: HCU). That is to say, the HCU can use the control method in this embodiment to realize the engine start control of the hybrid vehicle.

It should be understood that FIG. 4 depicts the process of self-learning of the clutch torque capacity adaptation. The method shown in FIG. 4 is executed each time the current start of the engine is completed to determine the clutch torque capacity adaptation amount ΔM to be used in the next start of the engine. As shown in FIG. 4 , the control method may include the following steps.

In step S410, after the current start of the engine is completed, it is determined whether it is necessary to adjust the clutch torque capacity adaptation amount for the current start of the engine.

If the clutch torque capacity adaptation amount used in the current startup cannot be applied to the next startup, it is necessary to adjust the clutch torque capacity adaptation amount used in the current startup. Therefore, it is determined as "Yes" in step S410, and the following execution is performed. Step S420; otherwise, execute the following step S430.

It should be understood that the clutch torque capacity adaptation amount ΔM used in the first start of the engine is 0, that is, the initial value of the clutch torque capacity adaptation amount is 0, and the method of this embodiment can be used to determine the non-first time for the engine. Clutch torque capacity adaptation during startup.

In step S420, the clutch torque capacity adaptation amount is adjusted according to the start time data of the engine in the current startup, and the adjusted clutch torque capacity adaptation amount is stored, wherein the adjusted clutch torque capacity adaptation amount for the next start of the engine.

In this embodiment, the starting time data of the engine in this startup includes, but is not limited to, the startup time of the engine in this startup, and the time data related to the startup time of the engine in this startup, which can be found in the engine's current startup time. In the next start, the clutch torque capacity adaptation for the current start of the engine is adjusted according to the aforementioned start time data, and the adjusted clutch torque capacity adaptation is stored as the clutch torque capacity adaptation to be used in the next start of the engine.

In a possible implementation manner, the clutch torque capacity adaptation amount for this start of the engine may be adjusted according to the start time data in the current start of the engine by: obtaining the start time data and the adjustment amount (to be The corresponding relationship table between the reduced/increased torque capacity), in which the adjustment amount corresponding to the starting time data is searched, and the clutch torque used for this start of the engine is adjusted according to the found adjustment amount. capacity adaptation.

In a possible implementation manner, the clutch torque capacity adaptation for this start of the engine may also be adjusted according to the start time data in this start of the engine by: adjusting the amount of clutch torque capacity used for this start of the engine The clutch torque capacity adaptation amount is adjusted so that the starting time data corresponding to the adjusted clutch torque capacity adaptation amount satisfies a predetermined condition. The fact that the start-up time data corresponding to the adjusted clutch torque capacity adaptation satisfies the predetermined condition means that: when the engine start-up process is performed using the adjusted clutch torque capacity adaptation, the start-up time data in the start-up process satisfies the predetermined condition .

In step S430, the clutch torque capacity adaptation amount for the current start of the engine is stored.

In this embodiment, the clutch torque capacity adaptation used in this start can still be applied to the next start, so there is no need to adjust the clutch torque capacity adaptation used in this start, so the clutch torque capacity adaptation used in this start can be directly stored. The used clutch torque capacity adaptation amount is used as the clutch torque capacity adaptation amount to be used in the next start.

In the method for controlling the engine startup of the hybrid electric vehicle in this embodiment, after each startup of the engine is completed, it is determined whether it is necessary to adjust the clutch torque capacity adaptation amount used for the current startup of the engine. The starting time data in the current start is used to adjust the clutch torque capacity adaptation amount, and the adjusted clutch torque capacity adaptation amount is stored as the clutch torque capacity adaptation amount to be used in the next start of the engine, thus, The target clutch torque capacity to be used in the next start of the engine is always reasonable, so that the engine speed can reach the threshold speed in time in the next start of the engine, so that the engine start process can be completed in time.

FIG. 5 is a schematic diagram of an engine startup process to which the engine startup control method of the hybrid vehicle of the present embodiment is applied. As shown in Fig. 5, by adjusting the clutch torque capacity adaptation amount used in the current start of the engine, the value of the target clutch torque capacity used in the next engine start is increased from M to M1 (M1=M+△M), Therefore, the time for the engine speed to reach the threshold speed is shortened, that is, the engine speed can reach the threshold speed in time, so that the engine startup process can be completed in time.

In a possible implementation manner, the condition for judging the need to be adjusted in step S410 is: from when the torque capacity of the clutch reaches the threshold torque capacity during the current start-up of the engine until the rotational speed of the engine reaches the threshold rotational speed The start-up time to date satisfies the predetermined condition.

In this embodiment, after the current start of the engine is completed, a start time that can characterize whether the adaptation of the clutch torque capacity used in the current start of the engine is appropriate, that is, when the torque capacity of the clutch reaches the threshold torque capacity, can be obtained. From the time period until the engine speed reaches the threshold speed, it is determined whether the clutch torque capacity adaptation amount for the current start of the engine needs to be adjusted according to whether the start time satisfies a predetermined condition.

In a possible implementation, during this start of the engine, when the torque capacity of the clutch reaches the threshold torque capacity, the timer is started, and when the engine speed reaches the threshold speed, the timer is stopped, so the The count value is the above-mentioned start time of this start of the engine.

If the starting time satisfies the predetermined condition, it means that the clutch torque capacity adaptation for the current start of the engine is reasonable, and the clutch torque capacity adaptation can be directly stored as the clutch torque capacity adaptation to be used when the engine is started next time , without adjusting the clutch torque capacity adaptation. In this case, the above-mentioned step S430 is performed.

If the starting time does not meet the predetermined conditions, it means that the clutch torque capacity adaptation amount used for the current start of the engine is unreasonable, and the clutch torque capacity adaptation amount needs to be adjusted, and the adjusted clutch torque capacity adaptation amount can be stored as The clutch torque capacity adaptation to be used the next time the engine is started. In this case, the above-mentioned step S420 is performed.

In a possible implementation manner, the predetermined condition is that the start-up time is less than the upper limit value of the start-up time and greater than the lower limit value of the start-up time. Therefore, in this start of the engine, if the start time is less than the upper limit of the start time and greater than the lower limit of the start time, it is determined that the start time satisfies the predetermined condition, and the clutch torque capacity adaptation amount for this start of the engine is It is reasonable to directly save the torque capacity adaptation of the clutch; on the contrary, if the starting time is less than the lower limit of the starting time or the starting time is greater than the upper limit of the starting time, it is judged that the starting time does not meet the predetermined conditions, and it is used for the engine's main function. The clutch torque capacity adaptation for the second start is unreasonable, and the clutch torque capacity adaptation needs to be changed.

In a possible implementation manner, the adjusting step S420 includes: if the starting time is less than the lower limit of the starting time, reducing the clutch torque capacity adaptation amount used for the current starting of the engine; if the starting time is greater than the starting time upper limit limit, the clutch torque capacity adaptation for this start of the engine is increased.

In this embodiment, if the start-up time is less than the lower limit of the start-up time, it means that the start-up time is too short and the target clutch torque capacity transmitted by the clutch is too large. and save the reduced clutch torque capacity adaptation amount as the clutch torque capacity adaptation amount to be used when the engine is next started. Conversely, if the start-up time is greater than the upper limit of the start-up time, it means that the start-up time is too long and the target clutch torque capacity transmitted by the clutch is too small. The increased clutch torque capacity adaptation amount is used as the clutch torque capacity adaptation amount to be used when the engine is started next time, and it is saved.

In a possible implementation manner, the adjusting step S420 includes: if the starting time is less than the lower limit value of the starting time, determining the torque capacity to be reduced according to the starting time and the acceptable engine starting time, and then The adjusted clutch torque capacity adaptation is obtained; if the starting time is greater than the upper limit of the starting time, the torque capacity to be increased is determined according to the starting time and the acceptable engine starting time, and then the adjusted torque capacity is obtained. Clutch torque capacity adaptation.

In this embodiment, if the start-up time is less than the lower limit of the start-up time, the torque capacity to be reduced can be determined according to the start-up time and the acceptable engine start-up time, from the clutch torque capacity adaptation amount used in this start of the engine Subtract this reduced torque capacity and use the subtracted difference as the adjusted clutch torque capacity adaptation. If the start-up time is greater than the upper limit of the start-up time, the torque capacity to be increased can be determined according to the start-up time and the acceptable engine start-up time. The capacities are added, and the added sum is used as the adjusted clutch torque capacity adaptation.

In one possible implementation, the following formula 1 can be used to determine the torque capacity to be reduced based on the cranking time and acceptable engine cranking time: △Ms=Ks*(T2-△t1-T1)/t0(Equation 1 ), where △Ms is the torque capacity to be reduced, Ks is the torque adjustment coefficient, T2 is the acceptable engine start-up time, T2-△t1 represents the lower limit of the start-up time, T1 is the start-up time of the engine this time, t0 is the time unit, note that Ks, T2, Δt1 and t0 can be preset values. And the following formula 2 can be used to calculate the clutch torque capacity adaptation to be used when the engine starts next time: △M'=△M-△Ms (formula 2), where △M' is the amount to be used when the engine starts next time. The clutch torque capacity adaptation (ie, the adjusted clutch torque capacity adaptation), ΔM is the clutch torque capacity adaptation used in the current start of the engine, and ΔMs is the torque capacity to be reduced.

In one possible implementation, the following formula 3 can be used to determine the torque capacity to be increased based on the cranking time and acceptable engine cranking time: ΔML=KL*(T3–(T2+Δt2))/t0(formula 3), where △ML is the torque capacity to be increased, KL is the torque adjustment coefficient, T2 is the acceptable engine start-up time, T2+△t2 represents the upper limit of the start-up time, T3 is the start-up time of the engine this time, t0 is the time unit, note that KL, T2, Δt2 and t0 can be preset values. And the following formula 4 can be used to calculate the clutch torque capacity adaptation to be used when the engine is started next time: △M'=△M+△ML (formula 4), where △M' is the clutch to be used when the engine is started next time The torque capacity adaptation amount (ie, the adjusted clutch torque capacity adaptation amount), ΔM is the clutch torque capacity adaptation amount used in this start of the engine, and ΔML is the torque capacity to be increased.

FIG. 6 is a schematic diagram showing start-up time according to an exemplary embodiment. As shown in FIG. 6 , the threshold torque capacity is T ₀ and the threshold speed is N ₀ , the curves L1, L2 and L3 correspond to the three-time starting curves of the engine, respectively, and the starting times T1, T2 and T3 of the curves L1, L2 and L3 are all is the time period from when the torque capacity of the clutch reaches the threshold torque capacity T ₀ until the engine speed reaches the threshold speed N ₀ , wherein the start time T1 is less than the start time T2, and the start time T2 is less than the start time T3. Among them, the starting time T2 is the acceptable engine starting time, the upper limit of the starting time is T2+△t2, and the lower limit of the starting time is T2-△t1. Therefore, when the starting time is greater than the starting time lower limit T2-△t1 and When it is less than the starting time upper limit value T2+Δt2, it is not necessary to adjust the clutch torque capacity adaptation amount for the current starting of the engine.

As shown in Fig. 6, the starting time T1 in Fig. 6 is less than the starting time lower limit value T2-Δt1, so the above formula 1 can be used to calculate the torque capacity to be reduced, and the above formula 2 can be used to calculate the next time the engine starts The amount of clutch torque capacity adaptation to be used. Correspondingly, as shown in Fig. 6, the starting time T3 in Fig. 6 is greater than the starting time upper limit value T2+Δt2, so the above formula 3 can be used to calculate the torque capacity to be increased, and the above formula 4 can be used to calculate the engine next time. The clutch torque capacity adaptation to be used at start-up.

FIG. 7 is a flow chart of a method for controlling engine start of a hybrid vehicle according to an exemplary embodiment. As shown in FIG. 7 , the control method may include the following steps.

In step S710, after the current start of the engine is completed, it is determined whether it is necessary to adjust the clutch torque capacity adaptation amount for the current start of the engine.

In step S720, the clutch torque capacity adaptation amount is adjusted according to the start time data of the engine in the current startup, and the adjusted clutch torque capacity adaptation amount is stored, wherein the adjusted clutch torque capacity adaptation amount for the next start of the engine.

In step S730, the clutch torque capacity adaptation amount for the current start of the engine is stored.

Note that steps S710 to S730 in FIG. 7 are the same as steps S410 to S430 in FIG. 4 , respectively, and thus descriptions of these steps are omitted.

In step S740, a target clutch torque capacity when starting to supply fuel to the engine is calculated based on the clutch base torque capacity and the adjusted clutch torque capacity adaptation.

In this embodiment, the clutch base torque capacity is introduced when calculating the target clutch torque capacity when fueling the engine. The target clutch torque capacity when fueling the engine starts at the next start of the engine may be calculated using a corresponding algorithm including but not limited to addition based on the clutch base torque capacity and the adjusted clutch torque capacity adaptation.

In a possible implementation, the basic clutch torque capacity may be determined according to the resistance torque of the engine. Specifically, the basic clutch torque capacity can be determined by the following methods: obtaining relevant information affecting the resistance torque of the engine, where the relevant information includes the cooling water temperature of the engine; determining the resistance torque of the engine according to the relevant information; The resistance torque determines the basic torque capacity of the clutch.

Since the relevant information including but not limited to the cooling water temperature of the engine will affect the resistance torque of the engine, for example, the lower the cooling water temperature, the greater the resistance torque of the engine. Therefore, the resistance torque of the engine can be determined according to the relevant information, and then according to The determined drag torque determines the base clutch torque capacity. In a possible implementation manner, a cooling water temperature sensor may be used to detect the cooling water temperature, and the cooling water temperature detected by the cooling water temperature sensor may be acquired.

In step S750, during the next start of the engine, when the torque capacity of the clutch reaches the target clutch torque capacity and the rotational speed of the engine reaches a predetermined rotational speed, fuel supply to the engine is started.

In this embodiment, during the next start of the engine, it can be monitored whether the clutch torque capacity decreases to the target clutch torque capacity calculated in step S740 and whether the engine speed reaches the threshold speed; When the target clutch torque capacity and the engine speed reaches the threshold speed, a command is sent to, for example, a fuel feed including a fuel tank and injectors to begin supplying fuel to the engine; in response to receiving the command, the fuel feed begins Supply fuel to the engine.

In the method for controlling the engine startup of the hybrid electric vehicle in this embodiment, after each startup of the engine is completed, it is determined whether it is necessary to adjust the clutch torque capacity adaptation amount used for the current startup of the engine. The clutch torque capacity adaptation amount is adjusted according to the start time data in this start, and the adjusted clutch torque capacity adaptation amount is stored. During the next start of the engine, the clutch torque capacity is adjusted according to the basic clutch torque capacity and the stored clutch torque capacity The adaptation amount calculates the target clutch torque capacity. When the clutch torque capacity reaches the calculated target clutch torque capacity and the engine speed reaches the threshold speed, fuel is supplied to the engine. In this way, since the target clutch torque capacity used is based on the adjusted torque capacity Therefore, the target clutch torque capacity used in the next start of the engine is always reasonable, so that the engine speed can reach the threshold speed in time in the next start of the engine, and thus can Complete the engine start process in a timely manner.

FIG. 8 is a block diagram of an engine starting control device for a hybrid electric vehicle according to an exemplary embodiment. The hybrid electric vehicle may be an HEV or a PHEV. The structure of the powertrain of the hybrid electric vehicle may adopt the structure shown in FIG. 1 . Specifically, the hybrid vehicle includes an engine, a drive motor, and a clutch disposed between the engine and the drive motor. The control device 800 can be applied to a hybrid control unit HCU of a hybrid vehicle. As shown in FIG. 8 , the control device 800 may include a judgment module 810 and an adjustment module 830 .

The judging module 810 is used for judging whether it is necessary to adjust the clutch torque capacity adaptation amount for the current starting of the engine after the current starting of the engine is completed. The adjustment module 830 is connected to the determination module 810, and is used for adjusting the clutch torque capacity adaptation amount according to the start time data of the engine in this start if the determination module 810 determines that the clutch torque capacity adaptation amount needs to be adjusted , and the adjusted clutch torque capacity adaptation amount is stored, wherein the adjusted clutch torque capacity adaptation amount is used for the next start of the engine.

In a possible implementation manner, the judging module 810 judges that the conditions that need to be adjusted are: from when the torque capacity of the clutch reaches a threshold torque capacity during the current start-up of the engine to when the rotational speed of the engine reaches The start-up time until the threshold rotational speed satisfies the predetermined condition.

In a possible implementation manner, the predetermined condition is that the startup time is less than the upper limit value of the startup time and greater than the lower limit value of the startup time, and the adjusting module 830 is configured to: if the startup time is less than the lower startup time If the starting time is greater than the upper limit value of the starting time, increase the clutch torque capacity used for this starting of the engine adaptation.

In a possible implementation, the adjustment module 830 is configured to: if the start time is less than the start time lower limit value, determine the torque capacity to be reduced according to the start time and an acceptable engine start time , and then obtain the adjusted clutch torque capacity adaptation; if the start-up time is greater than the upper limit of the start-up time, the torque capacity to be increased is determined according to the start-up time and the acceptable engine start-up time, and then adjusted Rear clutch torque capacity adaptation.

In a possible implementation manner, the above-mentioned control device 800 may further include:

a calculation module (not shown) for calculating a target clutch torque capacity when starting to supply fuel to the engine according to the basic clutch torque capacity and the adjusted clutch torque capacity adaptation;

A start-up module (not shown) is configured to, during the next start-up of the engine, start to the engine when the torque capacity of the clutch reaches the target clutch torque capacity and the rotational speed of the engine reaches a predetermined rotational speed. The engine supplies fuel.

Regarding the apparatus in the above-mentioned embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be described in detail here.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

A method for controlling engine startup of a hybrid vehicle, the hybrid vehicle comprising an engine, a drive motor, and a clutch disposed between the engine and the drive motor, wherein the method comprises:

a judging step for judging whether it is necessary to adjust the clutch torque capacity adaptation amount for the current starting of the engine after the current starting of the engine is completed;

The adjustment step is used for adjusting the clutch torque capacity adaptation amount according to the starting time data of the engine in the current start, if it is determined that the clutch torque capacity adaptation amount needs to be adjusted, and adjusts the adjusted clutch torque capacity adaptation amount. The adaptation is stored with the adjusted clutch torque capacity adaptation for the next start of the engine.
The method according to claim 1, wherein, in the judging step, the conditions that need to be adjusted are judged as:

The starting time from when the torque capacity of the clutch reaches the threshold torque capacity until the rotational speed of the engine reaches the threshold rotational speed during this start of the engine satisfies a predetermined condition.
The method according to claim 2, wherein the predetermined condition is that the startup time is less than an upper limit of the startup time and greater than a lower limit of the startup time,

The adjustment steps include:

If the start time is less than the start time lower limit value, reducing the clutch torque capacity adaptation for this start of the engine;

If the start time is greater than the start time upper limit value, the clutch torque capacity adaptation amount for this start of the engine is increased.
The method according to claim 3, wherein the adjusting step comprises:

If the start-up time is less than the lower limit of the start-up time, determining the torque capacity to be reduced according to the start-up time and the acceptable engine start-up time, so as to obtain the adjusted clutch torque capacity adaptation;

If the start-up time is greater than the upper limit of the start-up time, the torque capacity to be increased is determined according to the start-up time and the acceptable engine start-up time, so as to obtain the adjusted clutch torque capacity adaptation amount.
The method according to any one of claims 1 to 4, characterized in that, after the adjusting step, further comprising:

a calculating step for calculating a target clutch torque capacity when starting to supply fuel to the engine according to the basic clutch torque capacity and the adjusted clutch torque capacity adaptation;

The starting step is for starting fuel supply to the engine when the torque capacity of the clutch reaches the target clutch torque capacity and the rotational speed of the engine reaches a predetermined rotational speed during the next start of the engine.
An engine startup control device for a hybrid vehicle, the hybrid vehicle includes an engine, a drive motor, and a clutch disposed between the engine and the drive motor, wherein the device includes:

a judgment module for judging whether it is necessary to adjust the clutch torque capacity adaptation for this start of the engine after this start of the engine is completed;

The adjustment module is configured to adjust the clutch torque capacity adaptation amount according to the start time data of the engine in this start if the judgment module determines that the clutch torque capacity adaptation amount needs to be adjusted, and adjust the adjusted torque capacity adaptation amount. The clutch torque capacity adaptation is stored, wherein the adjusted clutch torque capacity adaptation is used for the next start of the engine.
The device according to claim 6, wherein the conditions for judging the need to be adjusted in the judging module are:

The starting time from when the torque capacity of the clutch reaches a threshold torque capacity to when the rotational speed of the engine reaches a threshold rotational speed during this start of the engine satisfies a predetermined condition.
The device according to claim 7, wherein the predetermined condition is that the start-up time is less than the upper limit of the start-up time and greater than the lower limit of the start-up time,

The adjustment module is configured to:

If the start time is less than the start time lower limit value, reducing the clutch torque capacity adaptation for this start of the engine;

If the start time is greater than the start time upper limit value, the clutch torque capacity adaptation amount for this start of the engine is increased.
The apparatus of claim 8, wherein the adjustment module is configured to:

If the start-up time is less than the lower limit of the start-up time, determining the torque capacity to be reduced according to the start-up time and the acceptable engine start-up time, so as to obtain the adjusted clutch torque capacity adaptation;

If the start-up time is greater than the upper limit of the start-up time, the torque capacity to be increased is determined according to the start-up time and the acceptable engine start-up time, so as to obtain the adjusted clutch torque capacity adaptation amount.
The device according to any one of claims 6 to 9, further comprising:

a calculation module, configured to calculate the target clutch torque capacity when starting to supply fuel to the engine according to the basic clutch torque capacity and the adjusted clutch torque capacity adaptation;

The starting module is configured to start supplying fuel to the engine when the torque capacity of the clutch reaches the target clutch torque capacity and the rotational speed of the engine reaches a predetermined rotational speed during the next start of the engine.