DE102015115714A1 - Torque control method and system for a hybrid electric vehicle - Google Patents

Abstract

The present disclosure relates to a torque control method and system for a hybrid electric vehicle. The method comprises: detecting an opening of an accelerator pedal of the hybrid electric vehicle and a speed of the hybrid electric vehicle; controlling the hybrid electric vehicle to transition to a respective operating mode according to the opening of the accelerator pedal, the speed of the vehicle and a mode command input by a driver; determining a torque of the internal combustion engine, a torque of the first electric motor and a torque of the second electric motor according to the current operating mode of the hybrid electric vehicle and correcting the torque of the internal combustion engine, the torque of the first electric motor and / or the torque of the second electric motor according to an active anti Slip strategy and a handling stability strategy.

Description

TERRITORY

The present disclosure relates to a hybrid electric vehicle, and more particularly to a torque control method and system for a hybrid electric vehicle.

BACKGROUND

In the prior art, a torque frame of a hybrid electric vehicle is provided incorporating a smaller number of conditions and only a torque distribution method under normal conditions is provided which does not take into account the driver's desired torque and thus is not comprehensive. Thus, there is a need for an improvement in the torque control strategy of the hybrid electric vehicle.

SUMMARY

The aim of the present disclosure is to solve at least one of the technical problems of the prior art. Therefore, one of objects of the present disclosure is to provide a torque control method for a hybrid electric vehicle that allows an output torque of an engine and an output torque of an electric motor to satisfy an operation request of the hybrid electric vehicle on the condition that they also correspond to the torque desired by the driver.

Another object of the present disclosure is to provide a torque control system for a hybrid electric vehicle.

To achieve the above objects, according to embodiments of a first aspect of the present disclosure, there is provided a torque control method for a hybrid electric vehicle, wherein a drive system of the hybrid electric vehicle comprises an internal combustion engine, a first electric motor, and a second electric motor, and wherein the torque control method comprises the steps of:
Detecting an opening of an accelerator pedal of the hybrid electric vehicle and a speed of the hybrid electric vehicle; Controlling the hybrid electric vehicle to transition to a respective operating mode according to the opening of the accelerator pedal, the speed of the hybrid electric vehicle, and a mode command input by a driver, the operating modes including a four-wheel mode, a sport mode, an economy mode, a pure electric mode, and a brake mode; when the hybrid electric vehicle is in the 4WD mode, the sport mode, the economy mode, the pure electric mode or the braking mode, determining a torque of the internal combustion engine, a torque of the first electric motor and a torque of the second electric motor according to the current operation mode of the hybrid electric vehicle and correcting the torque of the internal combustion engine, the torque of the first electric motor and / or the torque of the second electric motor according to an active anti-slip strategy and a handling stability strategy for outputting a target torque of the internal combustion engine, a target torque of the first electric motor and a target torque of the second electric motor.

In the torque control method for the hybrid electric vehicle according to embodiments of the present disclosure, first, the opening of the accelerator pedal of the hybrid electric vehicle and the speed of the hybrid electric vehicle are detected, and then the hybrid electric vehicle is controlled to rotate according to the opening of the accelerator pedal, the speed of the hybrid electric vehicle, and the speed of the hybrid electric vehicle The driver entered mode command in a certain operating mode such as the four-wheel drive mode, the sport mode, the economy mode, the pure electric mode or the brake mode passes. When the hybrid electric vehicle is in four-wheel drive mode, sport mode, economy mode, pure electric mode or brake mode, the torque of the engine, the torque of the first motor, and the torque of the second motor are then determined according to the current operating mode of the hybrid electric vehicle, and according to the active anti Slip strategy and the handling stability strategy corrects, whereby the target torque of the internal combustion engine, the target torque of the first electric motor and the target torque of the second electric motor are output. In this way, the output torque of the engine and the output torque of the electric motors can meet the operating requirements of the hybrid electric vehicle while meeting the desired torque of the driver. Further, by correcting the engine torque, the first electric motor torque, and / or the second electric motor torque according to the active anti-skid strategy and the handling stability strategy, the hybrid electric vehicle can be protected from slippage or spin, thereby increasing safety of the hybrid electric vehicle is improved.

According to an embodiment of the present disclosure, it is provided that when the opening of the accelerator pedal is larger than a first preset opening and the received mode command is an automatic mode command, the hybrid electric vehicle is controlled so that it switches to the four-wheel mode; when the opening of the accelerator pedal is greater than a second preset opening and less than or equal to the first preset opening, an opening change ratio of the accelerator pedal is greater than a first preset value and the received mode command is an automatic mode command, the hybrid electric vehicle is controlled to be in the Four-wheel mode switches; if the mode command is a four-wheel drive command, the hybrid electric vehicle is controlled to switch to four-wheel drive mode; if the opening of the accelerator pedal is greater than the second preset opening and less than or equal to the first preset opening and the received mode command is the automatic mode command, the hybrid electric vehicle is controlled to switch to the sport mode; when the opening of the accelerator pedal is greater than a third preset opening and smaller than or equal to the second preset opening, the opening change ratio of the accelerator pedal is greater than a second preset value and less than or equal to the first preset value, and the received mode command is the automatic mode command, the hybrid electric vehicle is controlled so that it switches to sports mode; when the received mode command is a sport mode command, the hybrid electric vehicle is controlled to switch to the sport mode; if the opening of the accelerator pedal is greater than the third preset opening and less than or equal to the second preset opening, the speed of the hybrid electric vehicle is greater than a first preset speed, and the received mode command is the automatic mode command, the hybrid electric vehicle is controlled to operate in the Economy mode switches; if the received mode command is a economy mode command, the hybrid electric vehicle is controlled to switch to the economy mode; when the opening of the accelerator pedal is greater than zero and less than or equal to the third preset opening, the speed of the hybrid electric vehicle is less than the first preset speed, and the received mode command is the automatic mode command, the hybrid electric vehicle is controlled to switch to the pure electric mode ; if the received mode command is a pure electric mode command, the hybrid electric vehicle is controlled to switch to pure electric mode; if the opening of the accelerator pedal is zero, the speed of the hybrid electric vehicle is greater than the first preset speed, and the received mode command is the automatic mode command, the hybrid electric vehicle is controlled to switch to the brake mode; and when the received mode command is a brake mode command, the hybrid electric vehicle is controlled to switch to the brake mode.

According to some embodiments of the present disclosure, determining the engine torque, the first electric motor torque, and the second electric motor torque according to the current operation mode includes: when the current operation mode of the hybrid electric vehicle is the all-wheel mode, distributing the torque to a front axle, and a Rear axle of the hybrid electric vehicle and calculating the torque of the internal combustion engine, the torque of the first electric motor and the torque of the second electric motor; if the current operating mode of the hybrid electric vehicle is the sport mode, distributing the torque to the internal combustion engine and the first electric motor; if the current operating mode of the hybrid electric vehicle is the economy mode, controlling the internal combustion engine to operate in an optimal fuel economy curve, and determining a torque distribution between the internal combustion engine and the first electric motor or a torque distribution between the internal combustion engine and the second electric motor; if the current operating mode of the hybrid electric vehicle is the pure electric mode, determining the torque of the second electric motor; and when the current operating mode of the hybrid electric vehicle is the braking mode, calculating a feedback torque of the second electric motor according to a brake torque distribution between the front axle and the rear axle and a ratio between regenerative braking and mechanical braking.

According to an embodiment of the present disclosure, correcting the engine torque, the first electric motor torque, and / or the second electric motor torque according to the active anti-slip strategy comprises: determining a speed change trend according to the speed of the hybrid electric vehicle; determining a slip rate of the hybrid electric vehicle; and correcting the torque of the front axle and the torque of the rear axle according to the speed change trend and the slip rate of the hybrid electric vehicle.

According to another embodiment of the present disclosure, correcting the engine torque, the first electric motor torque, and the second electric motor torque according to the handling stability strategy comprises: determining a steering angle of the hybrid electric vehicle; and correcting the torque of the rear axle of the Hybrid electric vehicle according to the steering angle and the speed of the hybrid electric vehicle.

According to an embodiment of the present disclosure, when the hybrid electric vehicle receives a shift command, it is determined that the hybrid electric vehicle is undergoing a dynamic shift, and at the beginning of the shift, a torque reduction operation on the engine torque, the first electric motor torque, and the engine torque second electric motor is performed to output the target torque of the internal combustion engine, the target torque of the first electric motor and the target torque of the second electric motor.

According to an embodiment of the present disclosure, when the hybrid electric vehicle is in a failure mode, upon receiving a shift command at the beginning of shifting, a torque limiting operation according to the engine torque, the first electric motor torque, and the second electric motor torque is performed outputting the target torque of the internal combustion engine, the target torque of the first electric motor, and the target torque of the second electric motor; and that upon not receiving a shift command, a torque limiting operation on the engine torque, the first electric motor torque, and the second electric motor torque is performed to output the target engine torque, the first electric motor target torque, and the second electric motor target torque the hybrid electric vehicle is damaged according to an error level.

According to an embodiment of the present disclosure, when slip or spin occurs on the hybrid electric vehicle, the front axle torque and the rear axle torque are set according to the engine torque, the first electric motor torque and the second electric motor torque at the start of the slip or spin-through to output the target torque of the internal combustion engine, the target torque of the first electric motor, and the target torque of the second electric motor.

Further, embodiments of the present disclosure also provide a torque control system for a hybrid electric vehicle; the system includes an internal combustion engine, a first electric motor, a second electric motor, and a controller configured to perform the above-described torque control method to control a torque of the internal combustion engine, a torque of the first electric motor, and a torque of the second electric motor.

In the torque control system for the hybrid electric vehicle, the output torque of the engine, the output torque of the first electric motor and the output torque of the second electric motor by applying the above-described torque control method, the operating requirements of the hybrid electric vehicle under normal conditions, with dynamic switching, in fault mode and under special conditions such. In passive slip or spin, so as to improve the safety of the hybrid electric vehicle.

BRIEF DESCRIPTION OF THE DRAWING

1 FIG. 12 is a flowchart of a torque control method of a hybrid electric vehicle according to an exemplary embodiment of the present disclosure; FIG.

2 FIG. 12 is a schematic diagram of a propulsion system of a four-wheel-drive hybrid electric vehicle according to an exemplary embodiment of the present disclosure; FIG.

3 FIG. 12 is a schematic diagram of determining an operating mode of the hybrid electric vehicle according to an exemplary embodiment of the present disclosure; FIG.

4 FIG. 12 is a schematic diagram of a torque control method of a hybrid electric vehicle according to an exemplary embodiment of the present disclosure; FIG. and

5 FIG. 12 is a schematic diagram of a torque control method of a hybrid electric vehicle according to another exemplary embodiment of the present disclosure. FIG.

DETAILED DESCRIPTION

In the following, exemplary embodiments are explained in more detail and examples thereof are shown in the attached drawing. In the figures to which the following description refers, like reference characters designate like or similar elements throughout the several views, unless otherwise indicated. Implementations described in the following exemplary embodiments do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of the apparatus and method consistent with Some aspects of the present disclosure, which are set forth in the appended claims.

Hereinafter, the torque control method and system of the hybrid electric vehicle according to the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

1 12 shows a flow chart of a torque control method of a hybrid electric vehicle according to an exemplary embodiment of the present disclosure, wherein a drive system of the hybrid electric vehicle includes an engine, a first electric motor, and a second electric motor.

At the in 2 The four-wheel hybrid electric vehicle shown drive system of the hybrid electric vehicle, in particular a front drive section and a rear drive section, wherein the front drive section, in particular an internal combustion engine, a first electric motor, such. B. a belt-driven starter-generator BSG, an automatic transmission assembly and a first differential mechanism comprises; The rear drive section mainly comprises a second electric motor, a single-stage reduction gear (including a first gear ZR1 and a second gear ZR2), and a second differential mechanism, wherein torque of the second electric motor is transmitted to two rear wheels via the single-stage reduction gear and the second differential mechanism, respectively.

As 1 1, the torque control method for the hybrid electric vehicle includes the following steps:
In step S1, an opening of an accelerator pedal of the hybrid electric vehicle and a speed of the hybrid electric vehicle are detected.

In step S2, the hybrid electric vehicle is controlled to transition to a respective operating mode according to the opening of the accelerator pedal, the speed of the hybrid electric vehicle, and a mode command inputted by a driver, the operating modes being a four-wheel mode, a sport mode, an economy mode, a pure electric mode, and include a braking mode.

According to an embodiment of the present disclosure, the hybrid electric vehicle is controlled to transition to four-wheel mode when the opening of the accelerator pedal is greater than a first preset opening and the received mode command is an automatic mode command or if the opening of the accelerator pedal is greater than a second preset opening and is less than or equal to the first preset opening, an opening change ratio of the accelerator pedal is greater than a first preset value, and the received mode command is the automatic mode command, or if the mode command is a four-wheel-mode command; the hybrid electric vehicle is controlled to switch to the sport mode when the opening of the accelerator pedal is greater than the second preset opening and less than or equal to the first preset opening and the received mode command is an automatic mode command or if the opening of the accelerator pedal is greater than a third is a preset opening and smaller than or equal to the second preset opening, the opening change ratio of the accelerator pedal is greater than a second preset value and less than or equal to the first preset value, and the received mode command is the automatic mode command or if the received mode command is a sports mode command; the hybrid electric vehicle is controlled to switch to the economy mode; if the opening of the accelerator pedal is greater than the third preset opening and less than or equal to the second preset opening, the speed of the hybrid electric vehicle is greater than a first preset speed and the received mode command is the automatic mode command or if the received mode command is an economy mode command; the hybrid electric vehicle is controlled to switch to the pure electric mode when the opening of the accelerator pedal is greater than zero and less than or equal to the third preset opening, the hybrid electric vehicle speed is less than the first preset speed, and the received mode command is the automatic mode command or if the received mode command is a pure electric mode command; and the hybrid electric vehicle is controlled to switch to the brake mode when the opening of the accelerator pedal is zero, the hybrid electric vehicle speed is greater than the first preset speed, and the received mode command is the automatic mode command or if the received mode command is a brake mode command. The first preset opening, the second preset opening, the third preset opening, the first preset value, the second preset value and the first preset speed may be determined according to actual situations.

It should be noted that in controlling the hybrid electric vehicle to switch to the pure electric mode according to the opening of the accelerator pedal and the speed of the hybrid electric vehicle, the state of charge of the battery in the hybrid electric vehicle also becomes it must be determined, ie, that it must be determined whether the battery can provide sufficient energy to drive the hybrid electric vehicle; When the state of charge of the battery is high enough to drive the hybrid electric vehicle, the hybrid electric vehicle is controlled to switch to pure electric mode.

When the hybrid electric vehicle is in operation, according to an exemplary embodiment of the present disclosure, as in FIG 3 3, the accelerator pedal opening and the speed of the hybrid electric vehicle are detected in real time, and an opening change ratio of the accelerator pedal is detected according to the detected opening of the accelerator pedal. Thereafter, the hybrid electric vehicle is controlled to switch to a specific operation mode according to the opening and the opening change ratio of the accelerator pedal, the speed of the hybrid electric vehicle, a mode command input via the input key, and the opening of the brake pedal.

Specifically, when the driver manually depresses a car key on a control panel, an intention of the driver according to the opening of the accelerator pedal, the opening change ratio, and the speed of the hybrid electric vehicle is automatically detected, and the hybrid electric vehicle is subsequently controlled to automatically operate according to the driver's recognized intention in a certain operating mode switches, such. B. the four-wheel drive mode, the sport mode, the economy mode, the pure electric mode or the braking mode.

If the driver manually depresses an all-wheel-drive button, a sports button, an Ecology Conservation Optimization (ECO) button, or a Zero-Emission Vehicle (ZEV) button, the hybrid electric vehicle is controlled to switch directly to an operating mode corresponding to the button. In addition, when an opening signal is received from the brake pedal, the hybrid electric vehicle is controlled to switch to the brake mode.

When the hybrid electric vehicle is in 4WD mode, sport mode, economy mode, pure electric mode, or brake mode, at step S3, torque of the engine, torque of the first electric motor, and torque of the second electric motor are determined according to the current operation mode of the hybrid electric vehicle, respectively corrected according to an active anti-skid strategy and a handling stability strategy such that a target rotational speed of the engine, a target rotational speed of the first electric motor and a target rotational speed of the second electric motor are output.

In some embodiments of the present disclosure, determining the engine speed, the speed of the first electric motor, and the speed of the second electric motor according to the current operating mode of the hybrid electric engine includes: if the current operating mode of the hybrid electric vehicle is the all-wheel mode, distributing the torque to a front axle and a rear axle of the hybrid electric vehicle and calculating the torque of the engine, the torque of the first electric motor and the torque of the second electric motor; if the current operating mode of the hybrid electric vehicle is the sport mode, distributing the torque to the internal combustion engine and the first electric motor; if the current operating mode of the hybrid electric vehicle is the economy mode, controlling the internal combustion engine to operate in an optimal fuel economy curve, and determining a torque distribution between the internal combustion engine and the first electric motor or a torque distribution between the internal combustion engine and the second electric motor; if the current operating mode of the hybrid electric vehicle is the pure electric mode, determining the torque of the second electric motor; and when the current operation mode of the hybrid electric vehicle is the brake mode, calculating a feedback torque of the second electric motor according to a brake torque distribution between the front axle and the rear axle and a ratio between regenerative braking and mechanical braking.

According to an embodiment of the present disclosure, correcting the engine torque, the first electric motor torque, and the second electric motor torque according to the active anti-skid strategy comprises: determining a speed change trend according to the speed of the hybrid electric vehicle; determining a slip rate of the hybrid electric vehicle; and correcting the torque of the front axle and the torque of the rear axle according to the speed change trend and the slip rate of the hybrid electric vehicle.

According to an embodiment of the present disclosure, correcting the engine torque, the first electric motor torque, and the second electric motor torque according to the handling stability strategy comprises: determining a steering angle of the hybrid electric vehicle; and correcting the torque of the rear axle of the hybrid electric vehicle according to the steering angle and the speed of the hybrid electric vehicle.

For example, in the case where the corrected front axle torque decreases, the engine torque is reduced when only the engine is providing power, or first, the first electric motor torque is reduced when the engine is providing power along with the first electric motor, because a reaction speed of the electric motor is faster than a reaction speed of the internal combustion engine. As the corrected torque of the rear axle decreases, the torque of the second electric motor is reduced. Obviously, the torque of the engine, the torque of the first electric motor and the torque of the second electric motor can be corrected in other ways according to the corrected torque of the front axle and the corrected torque of the rear axle, whereby a target torque of the internal combustion engine, a target torque of the first electric motor and a Target torque of the second electric motor are output.

When the hybrid electric vehicle is in operation, as in 4 First, in particular, a desired torque analysis according to the opening of the accelerator pedal, the opening of the brake pedal, and the speed of the hybrid electric vehicle may be made so that the desired torque desired by the driver may be determined, wherein the desired torque includes a desired drive torque and a desired brake torque.

After determining the desired torque desired by the driver, the operating mode of the hybrid electric vehicle may be determined in accordance with the opening and the opening change ratio of the accelerator pedal and the mode command input through the mode input key, and the torque distribution along respective components such as a torque converter. B. the internal combustion engine, the first electric motor and the second electric motor are made. When the current operating mode of the hybrid electric vehicle is the 4WD mode, the torque distribution is performed according to the desired torque on the front axle and the rear axle, and the engine torque, the first electric motor torque, and the second electric motor torque are calculated. When the current operation mode of the hybrid electric vehicle is the sport mode, the torque distribution is made according to the desired torque to the engine and the first electric motor. In the sport mode, the maximum acceleration by shifting can be detected, so that the speed of the hybrid electric vehicle can be increased or decreased quickly compared with the economy mode. When the current operating mode of the hybrid electric vehicle is the economy mode, the internal combustion engine is controlled by shifting so that it operates in an optimal fuel saving curve provided that the driver's desired torque is maintained, and then torque distribution between the internal combustion engine and the first electric motor or determines a torque distribution between the engine and the second electric motor. When the current operating mode of the hybrid electric vehicle is the pure electric mode, the torque of the second electric motor is calculated according to the desired torque desired by the driver and the gear ratio of the rear axle. When the current operating mode of the hybrid electric vehicle is the brake mode, a feedback torque of the second electric motor is calculated according to a brake torque distribution between the front axle and the rear axle, and a ratio between regenerative braking and mechanical braking.

After the torque distribution on respective components, such. As the internal combustion engine, the first electric motor and the second electric motor, the torque of the internal combustion engine, the torque of the first electric motor and / or the torque of the second electric motor according to the active anti-slip strategy and the handling stability strategy is corrected to the target torque of the internal combustion engine to output the target torque of the first electric motor and the target torque of the second electric motor. In particular, the front axle torque and the rear axle torque are corrected according to a speed change trend and a slip rate of the hybrid electric vehicle to avoid slippage. Further, the torque of the rear axle of the hybrid electric vehicle is corrected according to a steering angle and the speed of the hybrid electric vehicle to prevent cranking.

When the hybrid electric vehicle receives a shift command, according to an embodiment of the present disclosure, it is determined that the hybrid electric vehicle undergoes a dynamic shift, and at the beginning of the shift, a torque reduction operation is respectively applied to the engine torque, the first electric motor torque, and the second electric motor torque to output the target torque of the internal combustion engine, the target torque of the first electric motor, and the target torque of the second electric motor.

When the hybrid electric vehicle is in an error mode, according to one embodiment of the present disclosure, the present disclosure is omitted various conditions performed various operations. Upon receipt of a shift command, at the beginning of shifting, a torque limiting operation is performed on the engine torque, the first electric motor torque, and the second electric motor torque to output the target engine torque, the first electric motor target torque, and the second electric motor target torque. Upon non-receipt of a shift command, a torque limiting operation is performed on the engine torque, the first electric motor torque, and the second electric motor torque to output the target engine torque, the first electric motor target torque, and the second electric motor target torque before the hybrid electric vehicle is damaged according to an error level.

According to an embodiment of the present disclosure, when slip or spin occurs on the hybrid electric vehicle, the front axle torque and the rear axle torque according to the engine torque, the first electric motor torque, and the second electric motor torque at the start of the slip or the spin, respectively adapted to output the target torque of the internal combustion engine, the target torque of the first electric motor and the target torque of the second electric motor.

As 5 In addition, the hybrid electric vehicle torque control method proposed in the present disclosure further includes torque control in a dynamic shift, failure mode, or slip or spin of the hybrid electric vehicle, thereby providing more comprehensive torque control for the hybrid electric vehicle and improving the safety of the hybrid electric vehicle ,

As 5 1 shows the desired torque desired by the driver and active correction, (2) torque processing during the dynamic shift, (3) torque processing in failure mode, and (4) torque control in slip or spin. The torque processing during the active shifting operation may be realized by a hybrid control unit HCU or a transmission control unit TCU. In addition, the torque control required in slip or spin can be realized by an electronic stability program ESP, thereby reducing a communication delay between respective controllers.

Specifically, when the hybrid electric vehicle receives a shift command, the hybrid electric vehicle is controlled to perform the dynamic shift, and a torque reduction operation is performed on the engine torque, the first electric motor torque, and / or the second electric motor torque at the start of the shift, to output the target torque of the internal combustion engine, the target torque of the first electric motor, and the target torque of the second electric motor. After shifting, the torque of the engine, the torque of the first electric motor, and the torque of the second electric motor are rebuilt from the beginning of shifting.

When the hybrid electric vehicle further receives an error level signal, the hybrid electric vehicle is in the failure mode. When the hybrid electric vehicle is in the failure mode, upon receipt of the shift command at the start of shifting, a torque limiting operation is performed on the engine torque, the first electric motor torque, and the second electric motor torque, the target engine torque, the first electric motor target torque, and the target torque outputting the second electric motor, and when not receiving a shift command, a torque limiting operation is performed on the engine torque, the first electric motor torque, and the second electric motor torque, the target engine torque, the first electric motor target torque, and the second engine target torque Issue electric motor before the hybrid electric vehicle is damaged according to an error level.

Although in (1) the active anti-slip and anti-spin operation is performed on the torques of the respective components of the hybrid electric vehicle, under certain operating conditions, such as snow, slip or spin may still occur. When the hybrid electric vehicle receives an identification signal of a slip or spin, a slip and spin control is performed on the hybrid electric vehicle, and during heavy slip or spin, the front axle torque and the rear axle torque are determined according to the engine torque, the first electric motor torque, and adapted to the torque of the second electric motor at the beginning of the slip or spin and calculates the target torque of the internal combustion engine, the target torque of the first electric motor and the target torque of the second electric motor.

Finally, one of the branches (1) to (4) is selected and the respective torque of the internal combustion engine, the first electric motor and the second electric motor determined in this branch is used as the final target torque of the respective component. In summary, in the torque control method for the hybrid electric vehicle of the present disclosure, the torque of the internal combustion engine, the torque of the first electric motor, and the torque of the second electric motor can be determined in accordance with actual operating conditions such as the engine operating conditions. For example, the normal driving, the dynamic shifting, the failure mode and the slip or spin are corrected, whereby the target torque is output.

In summary, in the torque control method for the hybrid electric vehicle according to the embodiments of the present disclosure, first, the opening of the accelerator pedal of the hybrid electric vehicle and the speed of the hybrid electric vehicle are detected, and then the hybrid electric vehicle is controlled to rotate according to the opening of the accelerator pedal, the speed of the hybrid electric vehicle, and the hybrid electric vehicle changed from the driver input mode command in a certain operating mode, such. B. the four-wheel drive mode, the sport mode, the economy mode, the pure electric mode or the braking mode. If the hybrid electric vehicle is in four-wheel drive mode, sport mode, economy mode, pure electric mode, or brake mode, then the engine torque, first electric motor torque, and second electric motor torque are determined according to the current operating mode of the hybrid electric vehicle and according to the active anti Slip strategy and the handling stability strategy corrects, whereby the target torque of the internal combustion engine, the target torque of the first electric motor and the target torque of the second electric motor are output. In this way, the output torque of the internal combustion engine and the output torque of the electric motors can meet the operating requirements of the hybrid electric motor and at the same time correspond to the driver's desired torque. Moreover, by correcting the torque of the engine, the torque of the first electric motor, and / or the torque of the second electric motor according to the active anti-skid strategy and the handling stability strategy, the hybrid electric vehicle can be prevented from slipping and spinning, thereby improving the safety of the hybrid electric vehicle Hybrid electric vehicle is improved. In addition, the torque control method includes the torque control in dynamic shifting, in fault mode and under special conditions such. B. passive slip or spin, and is thus more comprehensive.

In addition, the present disclosure further provides a torque control system for the hybrid electric vehicle, the system comprising an internal combustion engine, a first electric motor, a second electric motor, and a controller configured to perform the above-described torque control method to control a torque of the engine, a torque of the engine first electric motor and a torque of the second electric motor to regulate.

With the torque control system for the hybrid electric vehicle, by executing the above-described torque control method, the output torque of the engine and the output torque of the electric motors, the operating requirements of the hybrid electric vehicle under normal conditions, with dynamic switching, in fault mode and under special conditions such. In passive slip or spin, thereby improving the safety of the hybrid electric vehicle.

It is understood that in the specification such terms as "medium", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear" , "Left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" to the one described in the respective place or to be referred to in the drawing in question drawing. These relative terms are for convenience of description and do not imply that the present invention must be designed or operated in a particular orientation.

Furthermore, as used herein, terms such as "first" and "second" are for descriptive purposes and are not intended to imply or imply relative importance or meaning, or to imply the number of specified technical features. Features referred to as "first" or "second" may therefore include one or more of these features. In the description of the present invention, "a plurality of" means two or more than two, unless otherwise specified.

Unless otherwise specified or limited, in the present invention the terms "mounted," "connected," "coupled," "attached," and the like are used in a broad sense and may refer to solid, detachable, or integral, mechanical, or electrical Connections, direct or indirect connections via intervening structures or internal communication connections of two elements that are understandable to the skilled person based on the particular situation.

In the present invention, a structure in which a first feature is "on" or "under" a second feature, unless otherwise specified or limited, may include an embodiment in which the first feature is in direct contact with the second feature, and may also include an embodiment in which the first feature and the second feature are not in direct contact with each other, but connected via an additional feature formed therebetween. Furthermore, a first feature "on," "above," or "on" a second feature may include an embodiment in which the first feature is straight or oblique "on," "above," or "at the top" of the second feature ( s), or simply mean that the first feature is at a greater height than the second feature, while a first feature "below," "below," or "at the bottom" of a second feature may include an embodiment in which the first one Feature straight or obliquely "below", "below" or "at the bottom" of the / the second feature (s), or simply mean that the first feature is present at a lower level than the second feature.

A reference in this specification to "one embodiment," "some embodiments," "just one embodiment," "another example," "an example," "a specific example," or "some examples" means that a particular feature, a structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or at least one example of the present disclosure. Thus, throughout the specification phrases appearing in numerous places refer to, for example, "in some embodiments," "in one embodiment," "one embodiment," "an example," "a specific example," or "in some examples "Not necessarily to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials or features may be combined in any suitable manner in one or more embodiments or examples.

Although illustrative embodiments have been shown and described, it will be appreciated by those skilled in the art that the above embodiments are not to be construed as limiting the present disclosure and that variations, alternatives and modifications may be made to the embodiments without departing from the spirit, principles and spirit of the invention Scope of the present disclosure.

Claims (9)

A torque control method for a hybrid electric vehicle, wherein a drive system of the hybrid electric vehicle comprises an internal combustion engine, a first electric motor, and a second electric motor, and wherein the torque control method comprises the steps of: Detecting an opening of an accelerator pedal of the hybrid electric vehicle and a speed of the hybrid electric vehicle; Controlling the hybrid electric vehicle to transition to a respective operating mode according to the opening of the accelerator pedal, the speed of the hybrid electric vehicle, and a mode command input by a driver, the operating modes including a four-wheel mode, a sport mode, an economy mode, a pure electric mode, and a brake mode; when the hybrid electric vehicle is in the 4WD mode, the sport mode, the economy mode, the pure electric mode or the braking mode, determining a torque of the internal combustion engine, a torque of the first electric motor and a torque of the second electric motor according to the current operation mode of the hybrid electric vehicle and correcting the torque of the internal combustion engine, the torque of the first electric motor and / or the torque of the second electric motor according to an active anti-slip strategy and a handling stability strategy for outputting a target torque of the internal combustion engine, a target torque of the first electric motor and a target torque of the second electric motor. The torque control method of claim 1, wherein when the opening of the accelerator pedal is greater than a first preset opening and the received mode command Automatic mode command is that the hybrid electric vehicle is controlled to switch to four-wheel mode; when the opening of the accelerator pedal is greater than a second preset opening and less than or equal to the first preset opening, an opening change ratio of the accelerator pedal is greater than a first preset value and the received mode command is the automatic mode command, the hybrid electric vehicle is controlled to be in the Four-wheel mode switches; if the mode command is a four-wheel drive command, the hybrid electric vehicle is controlled to switch to four-wheel drive mode; when the opening of the accelerator pedal is greater than the second preset opening and less than or equal to the first preset opening and the received mode command is an automatic mode command, the hybrid electric vehicle is controlled to switch to the sport mode; when the opening of the accelerator pedal is greater than a third preset opening and smaller than or equal to the second preset opening, the opening change ratio of the accelerator pedal is greater than a second preset value and less than or equal to the first preset value, and the received mode command is the automatic mode command, the hybrid electric vehicle is controlled so that it switches to sports mode; when the received mode command is a sport mode command, the hybrid electric vehicle is controlled to switch to the sport mode; if the opening of the accelerator pedal is greater than the third preset opening and less than or equal to the second preset opening, the speed of the hybrid electric vehicle is greater than a first preset speed, and the received mode command is the automatic mode command, the hybrid electric vehicle is controlled to operate in the Economy mode switches; if the received mode command is a economy mode command, the hybrid electric vehicle is controlled to switch to the economy mode; when the opening of the accelerator pedal is greater than zero and less than or equal to the third preset opening, the speed of the hybrid electric vehicle is less than the first preset speed, and the received mode command is the automatic mode command, the hybrid electric vehicle is controlled to switch to the pure electric mode ; if the received mode command is a pure electric mode command, the hybrid electric vehicle is controlled to switch to pure electric mode; if the opening of the accelerator pedal is zero, the speed of the hybrid electric vehicle is greater than the first preset speed, and the received mode command is the automatic mode command, the hybrid electric vehicle is controlled to switch to the brake mode; and when the received mode command is a brake mode command, the hybrid electric vehicle is controlled to switch to the brake mode. The torque control method according to claim 1, wherein determining the torque of the engine, the torque of the first electric motor, and the torque of the second electric motor according to the current operation mode comprises: when the current operation mode of the hybrid electric vehicle is the all-wheel mode, distributing the torque to a front axle and a rear axle of the hybrid electric vehicle and calculating the torque of the engine, the torque of the first electric motor, and the torque of the second electric motor; if the current operation mode of the hybrid electric vehicle is the sport mode, distributing the torque to the engine and the first electric motor; if the current operating mode of the hybrid electric vehicle is the economy mode, controlling the internal combustion engine to operate in an optimal fuel economy curve, and determining a torque distribution between the internal combustion engine and the first electric motor or a torque distribution between the internal combustion engine and the second electric motor; if the current operating mode of the hybrid electric vehicle is the pure electric mode, determining the torque of the second electric motor; and when the current operation mode of the hybrid electric vehicle is the brake mode, calculating a feedback torque of the second electric motor according to a brake torque distribution between the front axle and the rear axle and a ratio between regenerative braking and mechanical braking. Torque control method according to claim 3, wherein correcting the torque of the internal combustion engine, the torque of the first electric motor and / or the torque of the second electric motor according to the active anti-slip strategy comprises: Determining a speed change trend according to the speed of the hybrid electric vehicle; Determining a slip rate of the hybrid electric vehicle; and Correcting the torque of the front axle and the torque of the rear axle according to the speed change trend and the slip rate of the hybrid electric vehicle. The torque control method of claim 3, wherein correcting the torque of the engine, the torque of the first electric motor, and the torque of the second electric motor according to the handling stability strategy comprises: Determining a steering angle of the hybrid electric vehicle; and Correcting the torque of the rear axle of the hybrid electric vehicle according to the steering angle and the speed of the hybrid electric vehicle. The torque control method of claim 1, wherein when the hybrid electric vehicle receives a shift command, it is determined that the hybrid electric vehicle is undergoing a dynamic shift, and at the beginning of the shift, a torque reduction operation on the engine torque, the torque of the engine first electric motor and torque of the second electric motor is performed to output the target torque of the internal combustion engine, the target torque of the first electric motor and the target torque of the second electric motor. The torque control method of claim 1, wherein when the hybrid electric vehicle is in an error mode, upon receiving a shift command at the beginning of shifting, a torque limiting operation according to the engine torque, the first electric motor torque, and the second electric motor torque is performed to output the target engine torque, the first electric motor target torque, and the second electric motor target torque; and when not receiving a shift command, a torque limiting operation on the engine torque, the first electric motor torque, and the second electric motor torque is performed to output the target engine torque, the first electric motor target torque, and the second electric motor target torque before the hybrid electric vehicle is damaged according to an error level. The torque control method according to claim 1, wherein upon occurrence of slip or spin on the hybrid electric vehicle, the front axle torque and the rear axle torque are adjusted according to the engine torque, the first electric motor torque, and the second electric motor torque at the start of the slip or spin to output the target torque of the internal combustion engine, the target torque of the first electric motor and the target torque of the second electric motor. A torque control system for a hybrid electric vehicle, comprising: an internal combustion engine; a first electric motor; a second electric motor; and a controller configured to perform the torque control method of any one of claims 1 to 8 to control a torque of the engine, a torque of the first electric motor, and a torque of the second electric motor.

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