Vehicle hybrid power system coasting and stopping control method and system and electronic equipment

Abstract

The invention discloses a vehicle hybrid power system coasting and stopping control method and system and electronic equipment, and relates to the field of vehicle control, and the method comprises the steps that a vehicle operation signal is monitored through a vehicle control unit HCU, the vehicle control unit calls a preset control parameter, and when a stopping preset condition is met, a stopping timer is started; when the timing time of the stop timer is larger than a preset time threshold value, the vehicle control unit controls the clutch to be separated, and after it is confirmed that separation is in place through the clutch position sensor, a flameout instruction is sent to the engine controller to execute engine flameout; when the preset starting condition is met, a starting timer is started; when the timing time of the starting timer is larger than a preset time threshold value, the vehicle control starter calculates the vehicle demand torque according to the vehicle operation signal; when the vehicle demand torque is larger than a motor torque threshold value, a quick starting mode is executed; and when the vehicle demand torque is smaller than a motor torque threshold value, a low-speed starting mode is executed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle control, in particular to a vehicle hybrid system coasting stop control method, a vehicle hybrid system coasting stop control system, an electronic device and a storage medium. BACKGROUND

[0002] At present, the production and sales of domestic hybrid heavy commercial vehicles are increasing year by year. Hybrid vehicles have two power sources, one is electric energy and motor drive, and the other is fuel and engine drive. There is a large difference in energy conversion efficiency and power response speed between the two power sources. The energy management and coordinated control of the two power sources are the key to the economy and power of the vehicle. In addition, due to the change of battery state of charge, the change of driver's driving intention and other factors during the driving of the hybrid electric vehicle, the hybrid system will switch back and forth between the internal combustion engine mode, the pure electric mode, the parallel driving mode and the charging mode, which involves the control process of starting the engine and shutting down the engine during driving, such as switching from pure electric mode to hybrid mode, which requires starting the engine during driving. The impact of the change of torque during the process of starting the engine from static to starting is the main factor affecting the comfort of the mode switching process.

[0003] For example, Chinese patent, invention name: a hybrid vehicle control method, control system and hybrid vehicle, patent number: CN115465255B, specifically discloses determining the target SOC of the power battery, correcting according to the vehicle speed, road slope and altitude, combining the actual SOC and the vehicle power demand, controlling the engine start-stop and torque coordination, calculating the target working condition and transition working condition of the engine, and ensuring the coordinated operation of the engine and the motor.

[0004] Chinese patent, invention name: a control strategy for determining the engine cut-out time of a tractor, application number: CN116044594A, specifically discloses calculating the benefits and costs after the engine is cut out, combining the front slope information and historical power demand to determine whether the engine should be cut out, and the specific steps include calculating the power loss, energy consumption, power demand torque and slope resistance to determine the appropriate cut-out time.

[0005] Chinese patent, invention name: a method for starting the engine of a hybrid power system based on P2 architecture during driving, application number: CN115503682A, specifically discloses using a hybrid power system based on P2 architecture, determining the starting mode and mode of the engine through data comprehensive judgment of the throttle opening recognition module, engine information recognition module, motor control module, transmission control module and slope recognition module, and realizing the switching of the crawling starting mode and high-speed starting mode through the collaborative control of the C0 clutch and C1 clutch to optimize the engine starting process. SUMMARY

[0006] Therefore, the present application aims to provide a vehicle hybrid system coasting stop control method, a vehicle hybrid system coasting stop control system, electronic equipment and a storage medium. In the vehicle coasting condition, the engine stop and start time is determined by superimposing and judging four signals of vehicle speed, accelerator pedal, brake pedal and slope. The timer is set to reserve sufficient buffer space for the engine start and stop process, i.e. the engine is stopped in the coasting idle condition, thereby reducing fuel consumption and improving vehicle economy, and avoiding the influence of frequent engine start and stop on comfort and emission performance.

[0007] The present application provides the following solutions: according to one aspect of the present application, a vehicle hybrid system coasting stop control method is provided, comprising the following steps:

[0008] The vehicle running signals are monitored by the vehicle controller HCU, and the vehicle running signals include vehicle weight, slope, vehicle speed, accelerator pedal state and brake pedal state;

[0009] The vehicle controller calls preset control parameters, and the preset control parameters include vehicle inherent parameters and determination threshold parameters, the vehicle inherent parameters include transmission speed ratio, axle speed ratio and tire radius, and the determination threshold parameters include vehicle speed threshold, slope threshold range, motor torque threshold, stop timing threshold and start timing threshold;

[0010] When the preset stop condition is met, start the stop timer;

[0011] When the stop timer timing time is greater than the preset time threshold, the vehicle controller controls the clutch to separate, and after confirming that the separation is in place through the clutch position sensor, sends the engine off command to the engine controller to execute the engine off;

[0012] When the preset start condition is met, start the start timer;

[0013] When the start timer timing time is greater than the preset time threshold, the vehicle controller calculates the vehicle demand torque according to the vehicle running signals;

[0014] When the vehicle demand torque is greater than the motor torque threshold, execute the fast start mode;

[0015] When the vehicle demand torque is less than the motor torque threshold, execute the slow start mode.

[0016] Further, comprising:

[0017] The shutdown preset condition includes: the vehicle speed reaches a preset medium-high vehicle speed threshold, the accelerator pedal is in a released state, the brake pedal is in a released state, the slope is within a preset slope threshold range, and the above four conditions need to be met at the same time.

[0018] Further, comprising:

[0019] The execution process of the fast start mode includes:

[0020] The vehicle control unit controls the clutch to engage, and drives the engine speed to rise through the clutch;

[0021] When the engine speed reaches the target engine start speed, send the ignition command to the engine controller, and complete the fast start of the engine.

[0022] Further, comprising:

[0023] The execution process of the slow start mode includes:

[0024] Control the motor torque to reduce to zero torque;

[0025] Control the transmission through the transmission controller to disengage;

[0026] Control the clutch to engage to raise the engine speed;

[0027] When the engine speed reaches the target engine start speed, perform the ignition start, and after the start is completed, control the clutch to disengage, match the target gear through the motor speed regulation, and control the clutch to engage.

[0028] Further, comprising:

[0029] The engine start preset condition includes: the vehicle speed is reduced to a preset exit threshold, the accelerator pedal is in a depressed state, the brake pedal is in a depressed state, and the slope exceeds the preset threshold range. Any of the above four conditions can trigger the engine start timer to start.

[0030] Further, comprising:

[0031] The slope threshold range includes an upper threshold Sx and a lower threshold Sy. When determining whether the shutdown preset condition is met, it is necessary to ensure that the actual monitored slope S is between Sx and Sy. If the slope exceeds this range, the shutdown timer will not be triggered to start.

[0032] Further, comprising:

[0033] When performing the clutch disengagement and engagement operation, the vehicle control unit HCU receives the real-time position signal fed back by the clutch position sensor;

[0034] According to the real-time position signal, it is judged whether the clutch is disengaged or engaged to the position.

[0035] According to two aspects of the present application, a vehicle hybrid system coasting stop control system is provided, comprising:

[0036] a monitoring module, a calling module, a stop starting module and a start starting module;

[0037] The monitoring module is configured to monitor vehicle operation signals through a vehicle controller HCU, wherein the vehicle operation signals include vehicle weight, slope, vehicle speed, accelerator pedal state and brake pedal state.

[0038] The calling module is configured to call preset control parameters, wherein the preset control parameters include vehicle inherent parameters and determination threshold parameters, the vehicle inherent parameters include transmission speed ratio, axle speed ratio and tire radius, and the determination threshold parameters include vehicle speed threshold, slope threshold range, motor torque threshold, stop timing threshold and start timing threshold.

[0039] The stop starting module is configured to start a stop timer when stop preset conditions are met.

[0040] When the stop timer timing time is greater than a preset time threshold, the vehicle controller controls the clutch to be separated, and after the separation is confirmed by a clutch position sensor, a shutdown instruction is sent to the engine controller to execute engine shutdown.

[0041] The start starting module is configured to start a start timer when start preset conditions are met.

[0042] When the start timer timing time is greater than a preset time threshold, the vehicle controller calculates vehicle demand torque according to the vehicle operation signals.

[0043] When the vehicle demand torque is greater than the motor torque threshold, a fast start mode is executed.

[0044] When the vehicle demand torque is less than the motor torque threshold, a slow start mode is executed.

[0045] According to three aspects of the present application, an electronic device is provided, comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete mutual communication through the communication bus.

[0046] The memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of a vehicle hybrid system coasting stop control method.

[0047] According to four aspects of the present application, a computer readable storage medium is provided, which stores a computer program executable by an electronic device, and when the computer program runs on the electronic device, the electronic device executes the steps of a vehicle hybrid system coasting stop control method.

[0048] Compared with the prior art, the present application has the following advantages:

[0049] The present application determines the engine start-stop timing by superimposing four signals of vehicle speed, accelerator pedal, brake pedal and slope in the vehicle coasting condition, and sets a timer to reserve sufficient buffer space for the engine start and stop process, i.e. the engine is stopped in the coasting idle condition, thereby reducing fuel consumption and improving vehicle economy, and avoiding the influence of frequent engine start-stop on comfort and emission performance.

[0050] In the engine start control process, the present application determines the engine start mode by calculating the vehicle demand torque and determining whether it is greater than the maximum output torque of the motor. If the demand torque Tn is greater than the maximum output torque of the motor Temax, the power priority fast start mode is adopted, and the engine is started directly through the combination of the clutch. If the demand torque Tn is less than the maximum output torque of the motor Temax, the smooth priority slow start mode is adopted, the transmission is disengaged, the impact of starting the engine on the vehicle is cut off, and then the engine is started through the clutch, to ensure smooth transition of the vehicle torque in the start process and avoid impact.

[0051] The present application adopts the coasting stop-start control method of the hybrid system, and good economy, power and comfort effects are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the description of the specific embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0053] Figure 1 is a flow chart of a vehicle hybrid system coasting stop control method provided by one or more embodiments of the present application.

[0054] Figure 2 is a structural diagram of a vehicle hybrid system coasting stop control system provided by one or more embodiments of the present application.

[0055] Figure 3 is a structural principle diagram of a hybrid system of one specific embodiment of the present application.

[0056] Figure 4 is a coasting stop process control flow chart of one specific embodiment of the present application.

[0057] Figure 5 is a coasting start process control flow chart of one specific embodiment of the present application.

[0058] Figure 6 is a kind of electronic equipment structure diagram of the vehicle hybrid system coasting stop control method provided by one or more embodiments of the present application. DETAILED DESCRIPTION

[0059] The technical solutions of the present application will be described clearly and completely in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0060] Figure 1 is a flow chart of the vehicle hybrid system coasting stop control method provided by one or more embodiments of the present application.

[0061] As shown in Figure 1 , comprising the following steps:

[0062] Step S1, the vehicle operating signal is monitored by the whole vehicle controller HCU, and the vehicle operating signal includes: vehicle weight, slope, vehicle speed, accelerator pedal state and brake pedal state;

[0063] Specifically, the engine stop and start timing is determined by superimposing the above signal state.

[0064] Vehicle weight: affects vehicle inertia and power demand calculation, such as matching different torque under different vehicle weight.

[0065] Slope: judge the road surface fluctuation state,

[0066] Accelerator / brake pedal state: directly reflects the driver's operation intention, such as releasing the accelerator + releasing the brake is the prerequisite for stopping, and stepping down may trigger the start.

[0067] Step S2, the whole vehicle controller calls preset control parameters, and the preset control parameters include: whole vehicle inherent parameters and determination threshold parameters, the whole vehicle inherent parameters include transmission speed ratio, axle speed ratio and tire radius, and the determination threshold parameters include vehicle speed threshold, slope threshold range, motor torque threshold, stop timing threshold and start timing threshold;

[0068] Specifically, the whole vehicle inherent parameters: are the hardware properties determined when the vehicle is manufactured, which do not change with driving conditions, including transmission speed ratio (affecting power transmission efficiency), axle speed ratio (related to wheel speed and power output), tire radius (used to convert actual vehicle speed), which is the reference value of HCU to calculate power demand, vehicle speed and other key data.

[0069] Decision threshold parameter: a "trigger condition value" set in advance, used to determine whether to start the shutdown / startup process, such as vehicle speed threshold (to determine whether to reach medium-high speed to trigger coasting shutdown), slope threshold range (to determine whether the road slope is suitable for shutdown), motor torque threshold (to distinguish between fast / slow startup modes), shutdown / startup timing threshold (to avoid misjudgment of working conditions, and to execute the operation only when the conditions are met for a threshold value).

[0070] Step S3, when the shutdown preset condition is met, start the shutdown timer;

[0071] When the shutdown timer counts for more than a preset time threshold, the vehicle controller controls the clutch to separate, and after confirming that the separation is complete through the clutch position sensor, sends a shutdown command to the engine controller to execute engine shutdown;

[0072] Specifically, the startup timer is triggered: only when the vehicle meets the shutdown preset conditions, usually medium-high speed, accelerator / brake pedal is released, and the slope is within a reasonable range, the system will start the shutdown timer to avoid false triggering of shutdown;

[0073] Timing threshold verification: not immediately shutdown when the conditions are met, but wait for the shutdown timing to exceed the preset threshold (such as several seconds), which is to filter the temporary conditions that meet the conditions (such as temporarily releasing the pedal) and ensure the stability of the shutdown decision;

[0074] Step-by-step shutdown: after the timing threshold is met, the vehicle controller (HCU) completes the shutdown in two steps: first controls the clutch to separate, then confirms that the separation is complete through the clutch position sensor to avoid incomplete separation causing failure, and finally sends a command to the engine controller to execute engine shutdown, achieving safe and orderly shutdown

[0075] Step S4, when the startup preset condition is met, start the startup timer;

[0076] When the startup timer counts for more than a preset time threshold, the vehicle controller calculates the vehicle demand torque according to the vehicle running signal;

[0077] Specifically, first determine whether the engine needs to be started through the "startup preset condition" (such as the vehicle speed dropping to a threshold, stepping on the accelerator / brake, and the slope exceeding the range, etc.), and any one of them can be met. However, it does not immediately execute the startup, but starts the "startup timer" - this is to avoid frequent startup caused by temporary fluctuations in road conditions (such as temporarily stepping on the brake and releasing it), and to improve control stability.

[0078] Precise calculation of "demand torque" after delay

[0079] When the timer time exceeds the preset threshold (such as 1-2 seconds, ensuring that the engine starting demand is the real working condition demand), the vehicle control unit (HCU) calculates the actual power torque required by the current vehicle based on the real-time collected vehicle running signals (vehicle weight, slope, vehicle speed, throttle pedal state, etc.), which is the core basis for subsequent selection of fast starting or slow starting mode and is directly related to the smoothness and economy of power output.

[0080] Step S5, when the vehicle demand torque is greater than the motor torque threshold, the fast starting mode is executed;

[0081] Specifically, when the current power required by the vehicle (such as torque demand during rapid acceleration or climbing) exceeds the maximum torque that the motor can provide (motor torque threshold), it indicates that the motor cannot meet the power demand alone and needs to quickly involve the engine. Therefore, the fast starting mode is selected, the clutch is directly combined to pull up the engine speed, the ignition is started, the engine intervention time is shortened, the power interruption or deficiency is avoided, and the driving power responsiveness is ensured.

[0082] Step S6, when the vehicle demand torque is less than the motor torque threshold, the slow starting mode is executed.

[0083] Specifically, when the current power demand of the vehicle is low (such as uniform speed driving on flat road), the motor torque itself can cover the demand, and there is no need to urgently involve the engine. At this time, the slow starting mode is selected, the engine is started by first reducing the motor torque, shifting gears, and then combining the clutch, reducing the impact on power transmission during the engine starting process, avoiding the jerk feeling, prioritizing driving smoothness, and avoiding unnecessary energy consumption caused by engine starting under low load.

[0084] Further, comprising:

[0085] The shutdown preset conditions include: the vehicle speed reaches a preset medium-high vehicle speed threshold, the throttle pedal is in a released state, the brake pedal is in a released state, the slope is within a preset slope threshold range, and the above four conditions are met simultaneously.

[0086] Further, comprising:

[0087] The execution process of the fast starting mode includes:

[0088] The vehicle control unit controls the clutch to combine, and drives the engine speed to pull up through the clutch;

[0089] When the engine speed reaches the target engine starting speed, send the ignition instruction to the engine controller to complete the fast starting of the engine.

[0090] Further, comprising:

[0091] The execution process of the slow starting mode includes:

[0092] The motor torque is controlled to reduce to zero torque;

[0093] The transmission is controlled to disengage by the transmission controller;

[0094] The clutch is controlled to engage to pull up the engine speed;

[0095] When the engine speed reaches the target start-up speed, ignition start-up is performed, after the start-up is completed, the clutch is controlled to disengage, the target gear is matched by the motor speed regulation, and the clutch is controlled to engage.

[0096] Further, comprising:

[0097] The start-up preset conditions include: the vehicle speed is reduced to a preset exit threshold, the accelerator pedal is in a depressed state, the brake pedal is in a depressed state, and the slope exceeds a preset threshold range. Any one of the above four conditions can trigger the start-up timer to start.

[0098] Further, comprising:

[0099] The slope threshold range includes an upper threshold Sx and a lower threshold Sy. When determining whether the preset stop condition is met, it is necessary to ensure that the actual monitored slope S is between Sx and Sy. If the slope exceeds the range, the stop timer is not triggered to start.

[0100] Further, comprising:

[0101] When the clutch disengaging and engaging operations are performed, the vehicle control unit HCU receives real-time position signals fed back by the clutch position sensor;

[0102] According to the real-time position signal, it is determined whether the clutch is disengaged or engaged.

[0103] Specifically, by superimposing the vehicle speed, the accelerator pedal, the brake pedal, and the slope signals in the vehicle coasting condition, the engine stop and start timing is determined, and the timer is set to reserve sufficient buffer space for the engine start and stop process, i.e. in the coasting idle condition, the engine is stopped, thereby reducing fuel consumption and improving vehicle economy, and avoiding the influence of frequent engine start and stop on comfort and emission performance.

[0104] Finally, in the engine starting control process, whether the vehicle demand torque is greater than the maximum output torque of the motor is judged through the vehicle demand torque calculation to determine the engine starting mode. If the demand torque Tn is greater than the maximum output torque of the motor, the power priority fast engine starting mode is adopted, the engine is directly started through the combination of the clutch and the slip, and if the demand torque Tn is less than the maximum output torque of the motor Temax, the smooth priority slow engine starting mode is adopted, the transmission is disengaged, the impact of starting the engine on the vehicle is cut off, and then the engine is started through the clutch slip to ensure that the vehicle torque is smoothly transitioned during the engine starting process and impact is avoided.

[0105] The hybrid system sliding stop and starting control method is comprehensively adopted, and good economic efficiency, power performance and comfort effect are obtained.

[0106] Figure 2 It is a structural diagram of a vehicle hybrid system sliding stop control system provided by one or more embodiments of the application.

[0107] As shown in Figure 2 , comprising:

[0108] a monitoring module, a calling module, a stop starting module and a starting starting module;

[0109] The monitoring module is used for monitoring vehicle running signals through a vehicle controller HCU, and the vehicle running signals include vehicle weight, slope, vehicle speed, accelerator pedal state and brake pedal state.

[0110] The calling module is used for calling preset control parameters, and the preset control parameters include vehicle inherent parameters and determination threshold parameters.

[0111] The stop starting module is used for starting a stop timer when the stop preset condition is met.

[0112] When the stop timer timing time is greater than the preset time threshold, the vehicle controller controls the clutch to be separated, and after the clutch position sensor confirms that the separation is in place, a shutdown instruction is sent to the engine controller to execute engine shutdown.

[0113] The starting starting module is used for starting a starting timer when the starting preset condition is met.

[0114] When the starting timer timing time is greater than the preset time threshold, the vehicle controller calculates the vehicle demand torque according to the vehicle running signals.

[0115] When the vehicle demand torque is greater than the motor torque threshold, the fast starting mode is executed.

[0116] when the vehicle demand torque is less than a motor torque threshold, a slow start mode is executed.

[0117] It is worth noting that, although only some basic functional modules are disclosed in the embodiment, it does not mean that the composition of the system is limited to the above basic functional modules. On the contrary, the embodiment intends to express that one or more functional modules can be added to the above basic functional modules by those skilled in the art in combination with the prior art to form infinite embodiments or technical solutions. That is, the system is open rather than closed, and the protection scope of the present application claim cannot be limited to the disclosed basic functional modules. At the same time, for the convenience of description, the above device is described as various units and modules. Of course, the functions of the units and modules can be realized in the same software and / or hardware in the implementation of the present application.

[0118] The device implementation described above is only schematic, and the units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0119] Figure 3 is the structure principle diagram of the hybrid power system of one embodiment of the present application.

[0120] As shown in Figure 3 , the hybrid power system includes a vehicle controller HCU, an engine controller ECU, a transmission controller TCU, a motor controller MCU, an engine, a clutch, a motor, an AMT transmission, a main reducer, and a drive wheel; the vehicle controller HCU can be in communication with the engine controller ECU, the transmission controller TCU, and the motor controller MCU, and can transmit data to each other, and the transmission controller TCU can also be in direct communication with the engine controller ECU and the motor controller MCU, and can transmit data to each other. The engine, the clutch, the motor, the transmission, and the main reducer are arranged on the same axis, the clutch includes a driving end and a driven end, the driving end of the clutch is connected with the output shaft of the engine, and the driven end of the clutch is connected with the input shaft of the motor. The engine includes a starter, and the engine can be started.

[0121] Figure 4 is a control flow chart of the coasting stop process of one embodiment of the present application.

[0122] As Figure 4 shown, comprising the following steps:

[0123] S100: Monitor the vehicle weight, slope, vehicle speed, accelerator pedal, brake pedal signals. Read the transmission speed ratio, axle speed ratio, tire radius, vehicle speed threshold Vx, slope threshold Sx, Sy, motor torque threshold Temax, timing threshold tx, ty signals.

[0124] S101: Compare vehicle speed V with vehicle speed threshold Vx; only when the vehicle speed reaches medium-high speed, the vehicle starts to glide stop.

[0125] S102: Determine the accelerator pedal signal; need to release the accelerator pedal.

[0126] S103: Determine the brake pedal signal; need to release the brake pedal.

[0127] S104: Compare the slope S with the slope threshold Sx, Sy; only in the appropriate slope range, the vehicle starts to glide stop.

[0128] S105: When S101, S102, S103, S104 meet the conditions at the same time, start the timer.

[0129] S106: Compare the timing time t with the timing threshold tx.

[0130] S107: When the timing time t in S106 is greater than the timing threshold tx, enter the stop mode.

[0131] S108: Control the clutch to separate.

[0132] S109: Determine whether the clutch is separated to the right place.

[0133] S110: When the clutch is separated to the right place, execute the engine stop.

[0134] Figure 5 is a glide start process control flow chart of one embodiment of the application.

[0135] As Figure 5 shown, comprising the following steps:

[0136] S200: Monitor the vehicle weight, slope, vehicle speed, accelerator pedal, brake pedal signals. Read the transmission speed ratio, axle speed ratio, tire radius, vehicle speed threshold Vx, slope threshold Sx, Sy, motor torque threshold Temax, timing threshold tx, ty signals.

[0137] S201: Compare vehicle speed V with vehicle speed threshold Vx; only when the vehicle speed decreases to a certain range, the vehicle exits the glide stop.

[0138] S202: Determine the accelerator pedal signal; need to step on the accelerator pedal.

[0139] S203: Determine brake pedal signal; need to step on the brake pedal.

[0140] S204: Compare slope S and slope threshold Sx, Sy; when the slope exceeds a certain range, the vehicle exits the hill stop.

[0141] S205: When S101, S102, S103, S104 meet any condition, start the timer.

[0142] S206: Compare the timing time t and the timing threshold ty.

[0143] S207: When S206 timing time t> timing threshold ty, enter the engine starting mode.

[0144] S208: Determine the engine starting speed requirement, calculate the vehicle demand torque Tn according to the accelerator pedal depth, vehicle weight, slope, etc.

[0145] S209: When S208 vehicle demand torque Tn> Temax, the motor alone cannot meet the torque demand, and the engine power must be provided quickly, enter the fast engine starting mode.

[0146] S210: Combine the clutch; pull up the engine speed.

[0147] S211: Determine whether the engine speed is greater than the target engine starting speed;

[0148] S212: Start the engine.

[0149] S213: When S208 vehicle demand torque Tn≤Temax, the motor can meet the torque demand, enter the slow engine starting mode.

[0150] S214: Reduce the motor torque; can be unloaded to zero torque.

[0151] S215: Gear shifting; cut off the impact of starting the engine on the vehicle.

[0152] S216: Combine the clutch; pull up the engine speed.

[0153] S217: Determine whether the engine speed is greater than the target engine starting speed;

[0154] S218: Start the engine.

[0155] S219: Separate the clutch.

[0156] S220: Motor speed regulation.

[0157] S221: Switch target gear.

[0158] S222: Engage the clutch.

[0159] Specifically, by superimposing the signals of vehicle speed, accelerator pedal, brake pedal and slope in the vehicle coasting condition, the engine stop-start timing is determined, and the timer is set to reserve sufficient buffer space for the engine start and stop process, i.e. the engine is stopped in the coasting idle condition, thereby reducing fuel consumption and improving vehicle economy, and avoiding the influence of frequent engine start-stop on comfort and emission performance.

[0160] Finally, in the engine start control process, whether the vehicle demand torque is greater than the maximum output torque of the motor is determined by calculating the vehicle demand torque, to determine the engine start mode, if the demand torque Tn is greater than the maximum output torque of the motor Temax, the power priority fast start mode is adopted, the engine is started directly through the engagement clutch, if the demand torque Tn is less than the maximum output torque of the motor Temax, the smooth priority slow start mode is adopted, the transmission is disengaged, the impact of starting the engine on the vehicle is cut off, and then the engine is started through the clutch, to ensure smooth transition of the vehicle torque in the start process and avoid impact.

[0161] The comprehensive use of the hybrid system coasting stop-start control method has achieved good economic, dynamic and comfortable effects.

[0162] Figure 6 The electronic device structure block diagram of the vehicle hybrid system coasting stop-start control method provided by one or more embodiments of the application.

[0163] As shown in Figure 6 The application provides an electronic device, which comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete mutual communication through the communication bus.

[0164] The memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the vehicle hybrid system coasting stop-start control method.

[0165] The application also provides a computer readable storage medium which stores a computer program executable by an electronic device, and when the computer program runs on the electronic device, the electronic device executes the steps of the vehicle hybrid system coasting stop-start control method.

[0166] For the method embodiments, the description is made in a series of action combinations for simplicity and clarity, but those skilled in the art should know that the present application is not limited to the action sequence described, because according to the present application, certain steps can be performed in other sequences or at the same time. In addition, those skilled in the art should know that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily essential to the present application.

[0167] From the above description of the embodiments, those skilled in the art can clearly understand that the present application can be implemented by means of software and the necessary general hardware platform. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which can be stored in a storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments of the present application.

[0168] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for controlling coasting stop in a vehicle hybrid system, characterized in that, Includes the following steps: The vehicle operating signals are monitored through the vehicle controller (HCU), including vehicle weight, gradient, vehicle speed, accelerator pedal status, and brake pedal status. The vehicle controller calls preset control parameters, which include: inherent vehicle parameters and judgment threshold parameters. The inherent vehicle parameters include transmission ratio, axle ratio and tire radius. The judgment threshold parameters include vehicle speed threshold, slope threshold range, motor torque threshold, stop time threshold and start time threshold. When the preset shutdown conditions are met, the shutdown timer is started; When the stop timer exceeds the preset time threshold, the vehicle controller controls the clutch to disengage. After confirming that the clutch is disengaged by the clutch position sensor, it sends a shutdown command to the engine controller to shut down the engine. When the preset startup conditions are met, the startup timer is started. When the start-up timer exceeds a preset time threshold, the vehicle control system calculates the required torque of the vehicle based on the vehicle operation signal. When the vehicle's required torque exceeds the motor torque threshold, a fast start mode is executed. When the required torque of the vehicle is less than the motor torque threshold, a slow start mode is executed.

2. The method for controlling coasting stop of a vehicle hybrid system according to claim 1, characterized in that, The preset conditions for stopping include: the vehicle speed reaches a preset medium-high speed threshold, the accelerator pedal is released, the brake pedal is released, and the slope is within a preset slope threshold range, and all four conditions must be met simultaneously.

3. The method for controlling coasting stop of a vehicle hybrid system according to claim 1, characterized in that, The execution process of the fast startup mode includes: The vehicle controller controls the clutch engagement, which in turn drives the engine speed to increase. When the engine speed reaches the target start-up speed, an ignition command is sent to the engine controller to complete the rapid engine start-up.

4. The method for controlling coasting stop of a vehicle hybrid system according to claim 1, characterized in that, The execution process of the slow start mode includes: Control the motor torque to reduce it to zero torque; The transmission is disengaged via the transmission controller; Control the clutch engagement to increase engine speed; When the engine speed reaches the target start-up speed, ignition is performed. After starting, the clutch is disengaged and the target gear is matched by the motor speed regulation to control the clutch engagement.

5. The method for controlling coasting stop of a vehicle hybrid system according to claim 1, characterized in that, The preset start-up conditions include: vehicle speed reduced to a preset exit threshold, accelerator pedal depressed, brake pedal depressed, and gradient exceeding a preset threshold range. The start-up timer can be triggered if any one of the above four conditions is met.

6. The method for controlling coasting stop of a vehicle hybrid system according to claim 1, characterized in that, The slope threshold range includes an upper limit threshold Sx and a lower limit threshold Sy. When determining whether the preset shutdown conditions are met, it is necessary to ensure that the actual monitored slope S is between Sx and Sy. If the slope exceeds this range, the shutdown timer will not be triggered.

7. The method for controlling coasting stop of a vehicle hybrid system according to claim 1, characterized in that, include: When performing clutch disengagement and engagement operations, the vehicle control unit (HCU) receives real-time position signals from the clutch position sensor. Based on the real-time position signal, determine whether the clutch is fully disengaged or fully engaged.

8. A coasting stop control system for a vehicle hybrid system, characterized in that, include: Monitoring module, calling module, shutdown start-up module, and startup start-up module; The monitoring module is used to monitor vehicle operation signals through the vehicle controller HCU. The vehicle operation signals include: vehicle weight, gradient, vehicle speed, accelerator pedal status, and brake pedal status. The calling module is used to call preset control parameters, which include: vehicle inherent parameters and judgment threshold parameters. The vehicle inherent parameters include transmission ratio, axle ratio and tire radius. The judgment threshold parameters include vehicle speed threshold, slope threshold range, motor torque threshold, stop time threshold and start time threshold. The shutdown start module is used to start the shutdown timer when the preset shutdown conditions are met. When the stop timer exceeds a preset time threshold, the vehicle controller controls the clutch to disengage. After confirming that the clutch is disengaged by the clutch position sensor, it sends a shutdown command to the engine controller to shut down the engine. The startup module is used to start the startup timer when the preset startup conditions are met. When the start-up timer exceeds a preset time threshold, the vehicle control system calculates the required torque of the vehicle based on the vehicle operation signal. When the vehicle's required torque exceeds the motor torque threshold, a fast start mode is executed. When the required torque of the vehicle is less than the motor torque threshold, a slow start mode is executed.

9. An electronic device, characterized in that, include: The processor, communication interface, memory, and communication bus are connected, with the processor, communication interface, and memory communicating with each other via the communication bus. The memory stores a computer program, which, when executed by the processor, causes the processor to perform the steps of the vehicle hybrid system coasting stop control method according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, It stores a computer program executable by an electronic device, which, when run on the electronic device, causes the electronic device to perform the steps of the vehicle hybrid system coasting stop control method according to any one of claims 1-7.

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