Idling climbing method and device of hybrid power vehicle, vehicle and storage medium

Abstract

The invention relates to the technical field of hybrid power vehicles, in particular to an idling climbing method and device of a hybrid power vehicle, the vehicle and a storage medium, and the method comprises the steps that the current road slope of the hybrid power vehicle under the idling working condition is obtained; the target idle speed torque of the hybrid power vehicle is determined according to the current road gradient; and according to the target idle speed torque, the hybrid power vehicle is controlled to climb at idle speed. Therefore, the problems that in the related technology, when the hybrid power vehicle climbs at the idle speed, the rotating speed of an engine is reduced, and the smoothness of the whole vehicle is poor are solved.

Description

Technical Field

[0001] The present application relates to the technical field of hybrid vehicle, and in particular to an idling hill climbing method, device, vehicle and storage medium for a hybrid vehicle. Background Art

[0002] In the current automotive industry and market context, hybrid vehicles have become the mainstream development direction, and the configuration of hybrid power has also become diversified, including dual-motor configuration, extended-range configuration and single-motor P2 configuration. In the power system torque path control of P2 hybrid vehicles, the VCU (Vehicle control unit) serves as the hub to issue instructions to the ECU (Electronic Control Unit), TCU (Transmission Control Unit), MCU (Microcontroller Unit) and IBC (Integrated Brake Control) and conduct coordinated control.

[0003] Since P2 hybrid vehicles are equipped with transmissions, when idling in place and switching to crawling, the clutch needs to be engaged and the pressure to transmit torque needs to be increased, and the idle speed capacity of the engine and motor needs to be well matched to achieve smooth crawling and the power source speed will not be dragged down. However, P2 hybrid vehicles are affected by the changes in the comprehensive charging and discharging capacity of the electric drive system, and the idle performance varies greatly. When the hybrid idles, when the comprehensive capacity of the electric drive system is sufficient, the motor is responsible for controlling the idle speed stability, and the idle speed stability is strong; when the capacity of the electric drive system is weak, the engine is responsible for controlling the idle speed, and the idle speed stability is poor. Especially when the vehicle enters crawling on a slope, the transmission load increases rapidly to cope with the resistance of backward slipping, which will cause the speed to be dragged down due to insufficient engine response. In severe cases, the transmission protection will enter neutral, and the engine may even be dragged back and stalled, seriously affecting the smoothness of the vehicle. Summary of the invention

[0004] The present application provides an idling climbing method, device, vehicle and storage medium for a hybrid vehicle, so as to solve the problems of low engine speed and poor vehicle ride comfort caused by idling climbing of a hybrid vehicle in the related art.

[0005] The first aspect of the present application provides an idle climbing method for a hybrid vehicle, comprising the following steps: obtaining the current road slope of the hybrid vehicle under idle conditions; determining the target idle torque of the hybrid vehicle according to the current road slope; and controlling the idle climbing of the hybrid vehicle according to the target idle torque.

[0006] Optionally, determining the target idle torque of the hybrid vehicle according to the current road slope includes: obtaining a correspondence between the road slope and the idle torque, wherein the road slope is proportional to the idle torque; and determining the target idle torque of the hybrid vehicle based on the current road slope and the correspondence.

[0007] Optionally, before obtaining the current road slope of the hybrid vehicle in idle condition, it also includes: obtaining the current power of the power battery and the current temperature of the power battery and / or the motor; and determining the idle condition based on at least one of the current power and the current temperature.

[0008] Optionally, the idle condition is determined based on at least one of the current power and the current temperature, including: if the current power is higher than a first preset power, controlling the hybrid vehicle to enter a first idle condition; if the current power is lower than a second preset power or the current temperature is greater than the first preset temperature or the current temperature is lower than the second preset temperature, controlling the hybrid vehicle to enter a second idle condition.

[0009] Optionally, if it is the first idle condition, it also includes: obtaining the engagement torque of the clutch and the actual idle speed of the engine when the hybrid vehicle starts; obtaining the load required by the accessories of the hybrid vehicle, and converting the load into a target torque, wherein the target torque serves as the feedforward torque of the engine; adjusting the output torque of the engine and / or the load torque of the motor based on at least one of the engagement torque, feedforward torque, target idle torque and actual idle speed.

[0010] Optionally, if it is the second idle condition, before controlling the hybrid vehicle to idle climb according to the target idle torque, it also includes: increasing the target idle speed of the engine to the first target idle speed, and determining the target idle torque according to the first target idle speed, and controlling the hybrid vehicle to idle climb according to the target idle torque.

[0011] Optionally, if it is the second idle operating condition, it also includes: limiting the transmission rate of the clutch engagement torque when the hybrid vehicle starts; turning on the brake assist function of the integrated wire control system of the hybrid vehicle, and turning off the brake assist function after the transmission torque of the hybrid vehicle is greater than the rearward sliding resistance of the hybrid vehicle.

[0012] The second aspect of the present application provides an idle climbing device for a hybrid vehicle, including: an acquisition module for acquiring the current road slope of the hybrid vehicle under idle conditions; a determination module for determining the target idle torque of the hybrid vehicle according to the current road slope; and a control module for controlling the idle climbing of the hybrid vehicle according to the target idle torque.

[0013] Optionally, the determination module is further used to: obtain a correspondence between a road slope and an idle torque, wherein the road slope is proportional to the idle torque; and determine a target idle torque of the hybrid vehicle based on the current road slope and the correspondence.

[0014] Optionally, it also includes: a first acquisition module, used to obtain the current power of the power battery and the current temperature of the power battery and / or the motor before obtaining the current road slope of the hybrid vehicle under idle conditions; and determine the idle condition based on at least one of the current power and the current temperature.

[0015] Optionally, the first acquisition module is further used to: if the current power is higher than the first preset power, control the hybrid vehicle to enter the first idle condition; if the current power is lower than the second preset power or the current temperature is greater than the first preset temperature or the current temperature is lower than the second preset temperature, control the hybrid vehicle to enter the second idle condition.

[0016] Optionally, if it is the first idle condition, it also includes: an adjustment module, used to obtain the engagement torque of the clutch and the actual idle speed of the engine when the hybrid vehicle starts; obtain the load required by the accessories of the hybrid vehicle, and convert the load into a target torque, wherein the target torque is used as the feedforward torque of the engine; adjust the output torque of the engine and / or the load torque of the motor based on at least one of the engagement torque, feedforward torque, target idle torque and actual idle speed.

[0017] Optionally, if it is the second idle condition, it also includes: an improvement module, which is used to increase the target idle speed of the engine to the first target idle speed before controlling the hybrid vehicle to climb the idle speed according to the target idle torque, and determine the target idle torque according to the first target idle speed, and control the hybrid vehicle to climb the idle speed according to the target idle torque.

[0018] Optionally, if it is the second idle condition, it also includes: a limiting module, used to limit the transmission rate of the clutch engagement torque when the hybrid vehicle starts; turning on the brake assist function of the integrated wire control system of the hybrid vehicle, and turning off the brake assist function after the transmission torque of the hybrid vehicle is greater than the rearward sliding resistance of the hybrid vehicle.

[0019] A third aspect of the present application provides a hybrid vehicle, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to perform an idle climbing method for the hybrid vehicle as described in the above embodiment.

[0020] The fourth aspect of the present application provides a computer-readable storage medium on which a computer program or instruction is stored. The computer program or instruction is executed by a processor to perform the idle climbing method for a hybrid vehicle as described in the above embodiment.

[0021] Therefore, this application has at least the following beneficial effects:

[0022] The embodiment of the present application can determine the target idle torque of the hybrid vehicle based on the current road slope of the hybrid vehicle under idle conditions, and then control the idle climbing of the hybrid vehicle with the target idle torque, fully considering the influence of the road slope on the idle climbing of the hybrid vehicle, avoiding the engine speed from being dragged down during the climbing process, and improving the smoothness and consistency of the hybrid vehicle's crawling. Therefore, the technical problems in the related art such as the engine speed being dragged down and the poor smoothness of the whole vehicle caused by the hybrid vehicle idling and climbing are solved.

[0023] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0025] Figure 1 A flowchart of an idling hill climbing method for a hybrid vehicle provided according to an embodiment of the present application;

[0026] Figure 2 A schematic diagram of the signal interaction relationship between various controllers when crawling on a slope according to an embodiment of the present application;

[0027] Figure 3 A control flow chart of hill crawling provided according to an embodiment of the present application;

[0028] Figure 4 A schematic diagram of control of hill crawling at high power level provided in accordance with an embodiment of the present application;

[0029] Figure 5 A schematic diagram of hill crawling control when the electric drive system is hardware-limited according to an embodiment of the present application;

[0030] Figure 6 A schematic diagram of an idling hill climbing device for a hybrid vehicle provided according to an embodiment of the present application;

[0031] Figure 7 It is a schematic diagram of the structure of a hybrid vehicle provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0032] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0033] The following describes the idling climbing method, device, vehicle and storage medium of the hybrid vehicle of the embodiment of the present application with reference to the accompanying drawings. In view of the fact that the engine is responsible for controlling the idling speed and the idling stability is poor as mentioned in the background technology center. In particular, when the vehicle enters the crawling on the slope, the transmission load increases rapidly to cope with the resistance of the backward slip, which will cause the speed to be dragged down due to insufficient engine response, and in severe cases, the transmission protection will enter the neutral gear, and even the engine will be dragged back and stalled, which seriously affects the smoothness of the whole vehicle. The present application provides an idling climbing method for a hybrid vehicle, in which the target idling torque of the hybrid vehicle can be determined based on the current road slope of the hybrid vehicle under the idling condition, and then the target idling torque controls the idling climbing of the hybrid vehicle, fully considering the influence of the road slope on the idling climbing of the hybrid vehicle, avoiding the engine speed being dragged down during the climbing process, and improving the smoothness and consistency of the hybrid vehicle crawling. Thus, the engine speed is dragged down when the hybrid vehicle is idling and climbing, and the smoothness of the whole vehicle is poor. The problem is solved in the related art.

[0034] It should be noted that the solution of the present application is applicable to hybrid vehicles, mainly to hybrid vehicles of P2 configuration. The description of the following solution is based on the example of a hybrid vehicle of P2 configuration, and the solution of the present application is applicable to climbing a hill when the idle speed is controlled by the engine.

[0035] Specifically, Figure 1 A schematic flow chart of an idle hill climbing method for a hybrid vehicle provided in an embodiment of the present application.

[0036] like Figure 1 As shown, the idling climbing method of the hybrid vehicle includes the following steps:

[0037] In step S101 , the current road slope of the hybrid vehicle under idling condition is obtained.

[0038] It can be understood that the embodiment of the present application can obtain the current road slope of the hybrid vehicle under idle conditions, so as to subsequently determine the target idle torque based on the current road slope.

[0039] In an embodiment of the present application, before obtaining the current road slope of the hybrid vehicle in idle condition, it also includes: obtaining the current power of the power battery and the current temperature of the power battery and / or the motor; determining the idle condition based on at least one of the current power and the current temperature.

[0040] It can be understood that the embodiment of the present application can determine the idle condition according to at least one of the current power of the power battery, the current temperature of the power battery, and the current temperature of the motor.

[0041] In an embodiment of the present application, the idle condition is determined based on at least one of the current power and the current temperature, including: if the current power is higher than a first preset power, controlling the hybrid vehicle to enter a first idle condition; if the current power is lower than a second preset power or the current temperature is greater than the first preset temperature or the current temperature is lower than the second preset temperature, controlling the hybrid vehicle to enter a second idle condition.

[0042] Among them, the first preset power, the second preset power, the first preset temperature, and the second preset temperature can be set according to specific circumstances, and there is no specific limitation on this. For example, the first preset power is 90%, the second preset power is 20%, the first preset temperature is 40°C, and the second preset temperature is 0°C.

[0043] When crawling on a slope in a hybrid state, when the electric drive system is insufficient and the idle speed is controlled by the engine, there are two specific situations. One is the limitation of the charging power by the vehicle energy management system. In order to ensure the durability of the motor, the battery charging and discharging power is usually actively limited, such as when the battery power is too high. The second is the charging power capacity limit caused by hardware limitations, such as motor overtemperature and battery temperature is too low or too high. Therefore, the embodiment of the present application can determine the idle condition based on at least one of the current power and the current temperature. When the power battery power is too high, it is the first idle condition. When the motor is overtemperature or the power battery temperature is too low or too high, it is the second idle condition, so that how to achieve idle climbing can be determined later according to the specific idle type.

[0044] In step S102 , the target idle torque of the hybrid vehicle is determined according to the current road gradient.

[0045] The target idle torque is the reserved torque of the engine.

[0046] It should be noted that, at present, in order to maintain the economy of the whole vehicle, this part of the reserved torque is generally very small. Less reserved torque may lead to a series of problems such as unstable idle speed, difficulty in climbing, poor smoothness, slow response, reduced fuel economy and increased engine wear. Therefore, the embodiment of the present application can determine the target idle torque based on the current road slope, which can improve the driving experience and performance of the vehicle.

[0047] In an embodiment of the present application, the target idle torque of the hybrid vehicle is determined according to the current road slope, including: obtaining the correspondence between the road slope and the idle torque, wherein the road slope is proportional to the idle torque; and determining the target idle torque of the hybrid vehicle based on the current road slope and the correspondence.

[0048] The corresponding relationship may be pre-built.

[0049] It can be understood that the embodiment of the present application can determine the target idle torque of the hybrid vehicle by searching for a corresponding relationship based on the current road slope.

[0050] In step S103 , the hybrid vehicle is controlled to climb an idle hill according to the target idle torque.

[0051] It can be understood that the embodiment of the present application can control the hybrid vehicle to perform idle climbing according to the target idle torque, so as to fully consider the influence of the road slope on idle climbing, so as to avoid problems such as reduced engine speed, unstable idle speed, difficulty in climbing, etc. caused by hill climbing, thereby improving the driving experience and performance of the vehicle.

[0052] In an embodiment of the present application, if it is the first idle operating condition, it also includes: obtaining the engagement torque of the clutch and the actual idle speed of the engine when the hybrid vehicle starts; obtaining the load required by the accessories of the hybrid vehicle, and converting the load into a target torque, wherein the target torque serves as the feedforward torque of the engine; adjusting the output torque of the engine and / or the load torque of the motor based on at least one of the engagement torque, feedforward torque, target idle torque and actual idle speed.

[0053] It can be understood that, in the embodiment of the present application, when the hybrid vehicle is in the first idle condition, the load required by the accessories of the hybrid vehicle can be obtained and the load can be converted into a target torque, wherein the target torque is used as the feedforward torque of the engine, and the output torque of the engine and the load torque of the motor are adjusted according to at least one of the clutch engagement torque when the hybrid vehicle starts, the actual idle speed of the engine, the target idle torque and the actual idle speed.

[0054] In an embodiment of the present application, if it is the second idle condition, before controlling the hybrid vehicle to idle climb according to the target idle torque, it also includes: increasing the target idle speed of the engine to the first target idle speed, and determining the target idle torque according to the first target idle speed, and controlling the hybrid vehicle to idle climb according to the target idle torque.

[0055] It can be understood that when the idle condition of the hybrid vehicle is the second idle condition, the embodiment of the present application increases the target idle speed of the engine to the first target idle speed, determines the target idle torque based on the first target idle speed, and then controls the idle climbing of the hybrid vehicle based on the target idle torque.

[0056] In an embodiment of the present application, if it is the second idle operating condition, it also includes: limiting the transmission rate of the clutch engagement torque when the hybrid vehicle starts; turning on the brake assist function of the integrated wire control system of the hybrid vehicle, and turning off the brake assist function after the transmission torque of the hybrid vehicle is greater than the rearward sliding resistance of the hybrid vehicle.

[0057] It can be understood that the embodiments of the present application can limit the transmission rate of the clutch engagement torque when the hybrid vehicle starts, so that the load change speed accepted by the engine is reduced, and the engine has sufficient capacity to cope with the load change. However, since the rising speed of the clutch engagement torque is slowed down, there is a risk of slipping after the driver releases the brake. Therefore, the brake assist function of the integrated wire control system of the hybrid vehicle is turned on, and the brake assist function is turned off after the transmission torque of the hybrid vehicle is greater than the slip resistance of the hybrid vehicle.

[0058] It should be noted that under the working state of each component of the hybrid vehicle under idling conditions, the VCU will send the motor target torque to the MCU for power generation according to the needs of the energy management system. The negative torque output by the motor is the load of the engine; when the transmission is in the D gear state, the clutch only transmits a small part of the torque caused by the KP point pressure, and the load on the engine is small. The VCU will send the load of the motor and the transmission to the ECU, and the ECU will use the above load as the feedforward torque for idle control. The ECU controls the throttle opening and the ignition angle, leaving a part of the reserve torque so that the output torque can be quickly adjusted by adjusting the ignition angle when the load fluctuates to achieve idle stability. However, in order to maintain the best economy of the vehicle, this part of the reserve torque is generally left very little. When the IBC is on a flat road or a small slope, the driver releases the brake pedal, and the brake calipers of all four wheels are released; on an uphill road with a large slope, the HHC (Hill-start Assist Control) function will maintain the brake for a period of time before releasing it. It can be seen that the interaction between the controllers under the vehicle's slope crawling condition is not deep enough, and the coordination is not close enough, which will lead to the problem of low crawling speed and poor smoothness. Therefore, this application mainly aims to solve the above problems by optimizing the control strategy when the engine controls the idle speed. This control strategy is dominated by the VCU and involves the interaction between multiple controllers. The specific relationship is as follows Figure 2 shown.

[0059] The following will be combined Figure 2 The interactive relationship between them is described through a specific embodiment of the idling climbing method of the hybrid vehicle of the present application. In the VCU, due to the insufficient capacity of the electric drive system, the engine idling control is mainly divided into two situations. The specific process is as follows Figure 3 shown.

[0060] When crawling on a slope in hybrid mode, when the electric drive system is insufficient and the idle speed is controlled by the engine, the VCU monitors the vehicle status and driver operation at all times, receives the slope signal from the IBC controller, the status and capacity of the battery and motor system, and the load of the transmission starting clutch, and sends a torque demand to the engine as the feedforward torque for idle speed control. Based on the current slope size, the engine controls the throttle opening and ignition angle to achieve different torque reserves. The greater the slope, the greater the torque reserve, and a greater degree of rapid torque response can be achieved.

[0061] 1. The vehicle energy management system limits the charging power. In order to ensure the durability of the motor, the battery charging and discharging power is usually actively limited. If the battery power is too high, the battery charging power is limited, but it still has normal discharge capacity. The VCU can control the electric drive system to assist the hill start. When the battery power is high, the hill crawling control is as follows: Figure 4 shown.

[0062] When the idle speed control is in the charge of the engine, and the VCU recognizes that it is only caused by the excessive battery power, and the other electric drive system capabilities are in normal state, the vehicle enters the creeping state from the stationary parking on the slope, and the transmission normally engages the starting clutch and sends the real-time engagement torque to the VCU. The VCU calculates the load consumption required by the current vehicle accessories and converts it into torque. All load torques are sent by the VCU to the ECU as the feedforward torque for the engine idle speed control. The ECU controls the reasonable reserved torque according to the current slope size. When the driver releases the brake and enters the creeping state, the ECU quickly adjusts the ignition angle and throttle opening to maintain the idle speed at the target speed. Since the engine torque in the idle condition has a certain delay and the load in the creeping condition is large, the idle speed will inevitably drop. At this time, the VCU implements PI regulation on the load torque of the motor based on the difference between the real-time speed and the target idle speed. The PI regulation part is not included in the torque request from the VCU to the ECU. When the engine speed drops significantly, the MCU is controlled to make the motor generate positive torque to assist the idle speed to return to the target value. After that, the engine has sufficient torque capacity, and the motor torque can return to the normal control state, so that the vehicle can crawl smoothly on the slope and avoid speed drag or slipping. In this case, the IBC only needs to perform normal control.

[0063] 2. Charging power capacity limit caused by hardware limitations, such as motor overtemperature and battery temperature too low or too high. In this case, hill crawling requires limiting the combined torque of the transmission and braking assistance of the IBC. Figure 5 shown.

[0064] When the idle speed control is in the charge of the engine, the VCU recognizes that it is due to hardware limitations, such as low power or too high or too low temperature of the electric drive system. Compared with the first case, if the idle speed is dragged down during the crawling process, the motor has no ability to assist the crawling. At this time, the ECU still needs to adjust the reasonable reserved torque according to the current slope, and even needs to increase the target idle speed to further improve the idle speed stability. The VCU needs to actively limit the rate of the starting clutch torque engagement when the TCU enters the crawling from the stationary parking, so that the load change speed accepted by the engine is reduced, so that the engine has enough ability to cope with the load change and achieve stable control of the idle speed. Since the rising speed of the clutch engagement torque slows down, there is a risk of slipping after the driver releases the brake. At this time, the VCU sends a brake assist request to the IBC, and the IBC controls the vehicle to maintain braking until it recognizes that the current system's transmission torque is sufficient to cope with the resistance of the vehicle's slipping. The IBC controls the withdrawal of brake assist, and the vehicle achieves a smooth crawling uphill to avoid the risk of slipping. This strategy has a more obvious effect on the vehicle performance in the slope crawling condition when the slope is small and the IBC does not reach the threshold for automatic activation of the hill assist.

[0065] According to the idling hill climbing method of a hybrid vehicle proposed in an embodiment of the present application, the target idle torque of the hybrid vehicle can be determined based on the current road slope of the hybrid vehicle under idle conditions, and then the idling hill climbing of the hybrid vehicle is controlled by the target idle torque, fully considering the influence of the road slope on the idling hill climbing of the hybrid vehicle, avoiding the engine speed being dragged down during the climbing process, and improving the smoothness and consistency of the hybrid vehicle's crawling.

[0066] Next, the idling hill climbing device of a hybrid vehicle proposed in accordance with an embodiment of the present application will be described with reference to the accompanying drawings.

[0067] Figure 6 It is a block diagram of an idle climbing device of a hybrid vehicle according to an embodiment of the present application.

[0068] like Figure 6 As shown, the idling hill climbing device 10 of the hybrid vehicle includes: an acquisition module 100 , a determination module 200 and a control module 300 .

[0069] Among them, the acquisition module 100 is used to obtain the current road slope of the hybrid vehicle under idle conditions; the determination module 200 is used to determine the target idle torque of the hybrid vehicle according to the current road slope; the control module 300 is used to control the idle climbing of the hybrid vehicle according to the target idle torque.

[0070] In the embodiment of the present application, the determination module 200 is further used to: obtain the correspondence between the road slope and the idle torque, wherein the road slope is proportional to the idle torque; and determine the target idle torque of the hybrid vehicle based on the current road slope and the correspondence.

[0071] In the embodiment of the present application, the device 10 of the embodiment of the present application further includes: a first acquisition module.

[0072] Among them, the first acquisition module is used to obtain the current power of the power battery and the current temperature of the power battery and / or the motor before obtaining the current road slope of the hybrid vehicle under idle condition; and determine the idle condition based on at least one of the current power and the current temperature.

[0073] In an embodiment of the present application, the first acquisition module is further used to: if the current power level is higher than the first preset power level, control the hybrid vehicle to enter a first idle condition; if the current power level is lower than the second preset power level or the current temperature is greater than the first preset temperature or the current temperature is lower than the second preset temperature, control the hybrid vehicle to enter a second idle condition.

[0074] In the embodiment of the present application, if it is the first idle condition, the device 10 of the embodiment of the present application further includes: an adjustment module.

[0075] Among them, the adjustment module is used to obtain the clutch engagement torque and the actual idle speed of the engine when the hybrid vehicle starts; obtain the load required by the accessories of the hybrid vehicle and convert the load into a target torque, wherein the target torque serves as the feedforward torque of the engine; and adjust the output torque of the engine and / or the load torque of the motor based on at least one of the engagement torque, feedforward torque, target idle torque and actual idle speed.

[0076] In the embodiment of the present application, if it is the second idle condition, the device 10 of the embodiment of the present application further includes: an improvement module.

[0077] Among them, the improvement module is used to increase the target idle speed of the engine to a first target idle speed before controlling the hybrid vehicle to climb the idle speed according to the target idle torque, and determine the target idle torque according to the first target idle speed, and control the hybrid vehicle to climb the idle speed according to the target idle torque.

[0078] In the embodiment of the present application, if it is the second idle condition, the device 10 of the embodiment of the present application further includes: a limiting module.

[0079] Among them, the limiting module is used to limit the transmission rate of the clutch engagement torque when the hybrid vehicle starts; turn on the brake assist function of the integrated wire control system of the hybrid vehicle, and turn off the brake assist function after the transmission torque of the hybrid vehicle is greater than the rearward sliding resistance of the hybrid vehicle.

[0080] It should be noted that the above explanation of the embodiment of the idling hill climbing method of a hybrid vehicle is also applicable to the idling hill climbing device of the hybrid vehicle of this embodiment, and will not be repeated here.

[0081] According to the idle climbing device of the hybrid vehicle proposed in the embodiment of the present application, the target idle torque of the hybrid vehicle can be determined based on the current road slope of the hybrid vehicle under idle conditions, and then the idle climbing of the hybrid vehicle is controlled by the target idle torque, fully considering the influence of the road slope on the idle climbing of the hybrid vehicle, avoiding the engine speed being dragged down during the climbing process, and improving the smoothness and consistency of the hybrid vehicle's crawling.

[0082] Figure 7 A schematic diagram of the structure of a hybrid vehicle provided in an embodiment of the present application. The hybrid vehicle may include:

[0083] A memory 701 , a processor 702 , and a computer program stored in the memory 701 and executable on the processor 702 .

[0084] When the processor 702 executes the program, the idling hill climbing method for the hybrid vehicle provided in the above embodiment is implemented.

[0085] Furthermore, the hybrid vehicle further comprises:

[0086] The communication interface 703 is used for communication between the memory 701 and the processor 702 .

[0087] The memory 701 is used to store computer programs that can be executed on the processor 702 .

[0088] The memory 701 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0089] If the memory 701, the processor 702 and the communication interface 703 are implemented independently, the communication interface 703, the memory 701 and the processor 702 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 7Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0090] Optionally, in a specific implementation, if the memory 701, the processor 702 and the communication interface 703 are integrated on a chip, the memory 701, the processor 702 and the communication interface 703 can communicate with each other through an internal interface.

[0091] The processor 702 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0092] An embodiment of the present application also provides a computer-readable storage medium having a computer program or instruction stored thereon. When the computer program or instruction is executed by a processor, the idling climbing method of a hybrid vehicle as described above is implemented.

[0093] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0094] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0095] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0096] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one or a combination of multiple of the following technologies known in the art: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0097] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

Claims

1. An idling climbing method for a hybrid vehicle, It is characterized in that The following steps are involved: Obtaining the current road slope of the hybrid vehicle under idling conditions; determining a target idle torque of the hybrid vehicle according to the current road gradient; The hybrid vehicle is controlled to climb an idle hill according to the target idle torque.

2. The idling hill climbing method for a hybrid vehicle according to claim 1, It is characterized in that The step of determining the target idle torque of the hybrid vehicle according to the current road gradient comprises: Acquiring a corresponding relationship between a road slope and an idle torque, wherein the road slope is proportional to the idle torque; A target idle torque of the hybrid vehicle is determined based on the current road gradient and the correspondence relationship.

3. The idling hill climbing method for a hybrid vehicle according to claim 1, It is characterized in that Before obtaining the current road slope of the hybrid vehicle under idling conditions, it also includes: Obtain the current power of the power battery and the current temperature of the power battery and / or the motor; The idle operating condition is determined according to at least one of the current power and the current temperature.

4. The idling climbing method of a hybrid vehicle according to claim 3, It is characterized in that The determining the idle operating condition according to at least one of the current power and the current temperature includes: If the current power level is higher than a first preset power level, controlling the hybrid vehicle to enter a first idle state; If the current power level is lower than a second preset power level or the current temperature is greater than a first preset temperature or the current temperature is lower than a second preset temperature, the hybrid vehicle is controlled to enter a second idle state.

5. The idling hill climbing method for a hybrid vehicle according to claim 4, It is characterized in that If it is the first idle speed condition, it also includes: Acquiring the clutch engagement torque and the actual idle speed of the engine when the hybrid vehicle starts; acquiring a load required by an accessory of the hybrid vehicle and converting the load into a target torque, wherein the target torque serves as a feed-forward torque of the engine; The output torque of the engine and / or the load torque of the motor are adjusted based on at least one of the combined torque, the feed-forward torque, the target idle torque, and the actual idle speed.

6. The idling hill climbing method for a hybrid vehicle according to claim 4, It is characterized in that If it is the second idle condition, before controlling the hybrid vehicle to climb the hill at idle speed according to the target idle torque, the method further includes: The target idle speed of the engine is increased to a first target idle speed, the target idle torque is determined according to the first target idle speed, and the hybrid vehicle is controlled to climb an idle hill according to the target idle torque.

7. The idling hill climbing method for a hybrid vehicle according to claim 6, It is characterized in that If it is the second idle speed condition, it also includes: limiting the transmission rate of the clutch torque when the hybrid vehicle starts; The brake assist function of the integrated wire control system of the hybrid vehicle is turned on, and after the transmission torque of the hybrid vehicle is greater than the backward sliding resistance of the hybrid vehicle, the brake assist function is turned off.

8. An idling climbing device for a hybrid vehicle, It is characterized in that include: An acquisition module, used for acquiring the current road slope of the hybrid vehicle under idling conditions; a determination module, configured to determine a target idle torque of the hybrid vehicle according to the current road gradient; A control module is used to control the hybrid vehicle to climb the hill at idle speed according to the target idle torque.

9. A hybrid vehicle, It is characterized in that include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the idling hill climbing method for a hybrid vehicle as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program or instructions stored thereon, It is characterized in that The computer program or instruction is executed by a processor to implement the idling hill climbing method for a hybrid vehicle as described in any one of claims 1-7.

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