CN115075961B - Engine stop control method, device, equipment and storage medium - Google Patents
Engine stop control method, device, equipment and storage medium Download PDFInfo
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- CN115075961B CN115075961B CN202210852708.4A CN202210852708A CN115075961B CN 115075961 B CN115075961 B CN 115075961B CN 202210852708 A CN202210852708 A CN 202210852708A CN 115075961 B CN115075961 B CN 115075961B
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- 238000000034 method Methods 0.000 title claims abstract description 78
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- 238000012544 monitoring process Methods 0.000 claims description 11
- 230000003068 static effect Effects 0.000 claims description 6
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- 230000000694 effects Effects 0.000 abstract description 9
- 238000004146 energy storage Methods 0.000 abstract description 8
- 230000005611 electricity Effects 0.000 abstract description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 297
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
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Abstract
The application discloses an engine stop control method, a device, equipment and a storage medium, wherein the engine stop control method comprises the following steps: when the stop requirement of the engine is detected, the current rotating speed of the engine is obtained; and determining a target feedback torque according to the rotating speed grade of the current rotating speed, and sending the target feedback torque to the ISG controller so that the ISG controller controls the ISG to generate torque opposite to the engine, and dragging the engine to stop step by step. It can be understood that the application sets the corresponding target feedback torque according to the current rotation speed of the engine, so that the ISG responds to the target feedback torque and generates the torque opposite to the rotation direction of the engine to drag the engine to stop, in the process, the current state of the engine is combined to gradually slow down the engine, the stable stop process is ensured, and meanwhile, the crankshaft inertia force of the engine is utilized to drag the ISG to generate electricity, thereby realizing the effects of stability, energy saving and energy storage in the engine stop process.
Description
Technical Field
The present application relates to the field of automotive power control technologies, and in particular, to an engine shutdown control method, an engine shutdown control device, an engine shutdown control apparatus, and a storage medium.
Background
With the rapid development of the current society, the global petroleum energy reserve is reduced year by year, and the automobile exhaust emission is rapidly increased, so that the energy and environmental problems are important factors for restricting the sustainable development of the human society and economy, and under the background, the automobile field takes a battery with zero emission and no pollution as a novel energy. But greatly limits the large-scale market popularization of the electric automobile due to the characteristics of the battery, the technical bottleneck and the imperfect factors of the infrastructure charging facility.
Because the methanol hybrid electric vehicle is compared with the pure electric vehicle, the problems of long charging time and inconvenient charging of the electric vehicle are solved, and compared with the traditional fuel oil vehicle, the emission of pollutants is greatly reduced, and compared with the traditional methanol vehicle, the easier control engine can be kept in an optimal working interval for a long time, and a better energy-saving and emission-reducing effect is obtained, so that the P2 architecture hybrid commercial vehicle is widely popularized and used.
At present, when a methanol engine is stopped and fuel is cut off, a certain inertia force exists on a methanol engine crankshaft, so that the engine is stopped for too long, and a large amount of energy is lost in the stopping process.
Disclosure of Invention
The application mainly aims to provide an engine shutdown control method, an engine shutdown control device and a storage medium, and aims to solve the technical problem that the engine shutdown time is too long in the engine shutdown process of an existing P2 architecture hybrid commercial vehicle.
To achieve the above object, the present application provides an engine shutdown control method including:
when the stop requirement of the engine is detected, acquiring the current rotating speed of the engine;
and determining a target feedback torque according to the rotating speed grade of the current rotating speed, and sending the target feedback torque to an ISG controller so that the ISG controller controls the ISG to generate torque opposite to the engine, and dragging the engine to stop step by step.
Illustratively, before the obtaining the current rotation speed of the engine, the method includes:
Monitoring the real-time working condition of the vehicle;
Outputting a demand instruction of engine shutdown when the vehicle is in a preset working condition, so that a vehicle controller responds to the demand instruction and stops the engine;
The preset working conditions comprise at least one of a vehicle static working condition, an ISG-free forward driving torque working condition and a working condition that a clutch between the ISG and the engine is in a connection state.
By way of example, the preset operating condition is the ISG-free forward drive torque operating condition,
And if the vehicle is in the preset working condition, the method comprises the following steps:
judging whether the ISG has the forward driving torque or not, wherein the forward driving torque is consistent with the driving force of the vehicle;
If not, the vehicle is in the ISG-free forward driving torque working condition.
In an example, the determining a target feedback torque according to the rotation speed level of the current rotation speed, and sending the target feedback torque to an ISG controller, so that the ISG controller controls the ISG to generate a torque opposite to the engine, and drags the engine to stop step by step, includes:
acquiring a preset torque mapping table;
based on the torque mapping table, acquiring torque corresponding to the current rotating speed, and obtaining the target feedback torque;
and sending the target feedback torque to an ISG controller so that the ISG controller controls the ISG to generate torque opposite to the engine, and dragging the engine to stop step by step.
Exemplary, before the obtaining the preset torque mapping table, the method includes:
And establishing the torque mapping table according to the engine speed and preset ISG feedback torque, wherein the ISG feedback torque is calculated based on the engine speed of the engine.
Exemplary, the obtaining, based on the torque mapping table, the torque corresponding to the current rotation speed to obtain the target feedback torque includes:
Based on the torque mapping table, matching the current rotating speed with the rotating speed of the engine in the torque mapping table to obtain the rotating speed grade;
and obtaining corresponding target feedback torque according to the rotating speed grade.
Illustratively, the sending the target feedback torque to the ISG controller, so that the ISG controller controls the ISG to generate a torque opposite to the engine, and dragging the engine to stop step by step includes:
Transmitting the target feedback torque to the ISG controller so that the ISG generates a torque opposite to the engine, wherein the torque gradually decreases with time;
And monitoring the engine rotating speed in real time, and finishing the stopping of the engine when the engine rotating speed is zero and the target feedback torque is zero.
To achieve the above object, the present application also provides an engine stop control device including:
the rotating speed acquisition module is used for acquiring the current rotating speed of the engine when the stopping requirement of the engine is detected;
and the torque feedback module is used for determining a target feedback torque according to the rotating speed grade of the current rotating speed and sending the target feedback torque to the ISG controller so that the ISG controller controls the ISG to generate torque opposite to the engine and drags the engine to stop step by step.
In order to achieve the above object, the present application also provides an engine stop control apparatus including a memory, a processor, and an engine stop control program stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the engine stop control method as described above.
In order to achieve the above object, the present application also provides a computer storage medium having stored thereon an engine stop control program which, when executed by a processor, implements the steps of the engine stop control method as described above.
Compared with the prior art, the method has the advantages that when the stopping requirement of the engine is detected, the current rotating speed of the engine is obtained, compared with the overlong stopping time in the stopping process of the engine in the conventional P2-architecture hybrid commercial vehicle; and determining a target feedback torque according to the rotating speed grade of the current rotating speed, and sending the target feedback torque to an ISG controller so that the ISG controller controls the ISG to generate torque opposite to the engine, and dragging the engine to stop step by step. It can be understood that the application sets the corresponding target feedback torque according to the current rotation speed of the engine, the ISG responds to the target feedback torque to generate the torque opposite to the rotation direction of the engine so as to drag the engine to stop, in the process, the engine is gradually decelerated by combining the current state of the engine until the engine stops, the stable stop process is ensured, meanwhile, the ISG is dragged by the inertia force of the crankshaft of the engine to generate electricity, in the process of gradually decelerating the engine, the maximum feedback electric quantity is obtained through the target feedback torque which is gradually changed, and the effects of stability, energy saving and energy storage in the engine stop process are realized.
Drawings
FIG. 1 is a flow chart of a first embodiment of an engine shutdown control method of the present application;
FIG. 2 is a functional block diagram of a preferred embodiment of an engine shutdown control device of the present application;
FIG. 3 is a schematic diagram of a hardware operating environment according to an embodiment of the present application.
The achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The application provides an engine shutdown control method, and referring to fig. 1, fig. 1 is a flow chart of the engine shutdown control method of the application.
Embodiments of the present application also provide embodiments of engine shutdown control methods, it being noted that although a logic sequence is shown in the flow chart, in some cases the steps shown or described may be performed in a different order than that shown or described herein. The engine stop control method may be applied to a computer, and for convenience of description, each step of executing the main body description of the engine stop control method is omitted below, the engine stop control method including:
Step S110, when a stop demand of the engine is detected, obtaining a current rotation speed of the engine.
In the P2 architecture hybrid commercial vehicle, the methanol engine and the ISG motor are commonly used for mixing to provide power for the vehicle, the methanol engine is used as an engine type for details, the methanol engine crankshaft has certain inertia force at the moment of stopping and cutting off the fuel of the methanol engine, the direct stopping can cause the problem of overlong stopping time, and meanwhile, a large amount of energy is lost in the stopping process, if the inertia force can be fully utilized in a feedback way, the methanol engine is frequently started and stopped, and a better energy-saving effect is obtained.
Therefore, when the stop requirement of the methanol engine is detected, the current rotating speed of the methanol engine is obtained, the inertia torque of the methanol engine under the inertia force can be calculated through the current rotating speed, and the negative torque corresponding to the inertia torque is provided for the ISG (INTEGRATED STARTER generator, integrated starting/generating integrated motor), so that the rotating torque of the ISG is opposite to the rotating torque of the methanol engine, and the torque of the methanol engine is reversely dragged through the ISG, so that the methanol engine is stopped, meanwhile, different feedback electric quantity can be obtained in the rotating process of the ISG, and the feedback electric quantity is stored in the ISG to provide power for the vehicle.
It will be appreciated that the shutdown demand of the methanol engine may be fed back by a shutdown signal that is generated when the vehicle condition does not require the methanol engine to start, or when the vehicle is in EV mode, and when the shutdown signal is received, it is determined that the methanol engine has a shutdown demand. It should be noted that, other shutdown signal generation manners are not described in detail.
Illustratively, the ISG is mounted between the methanol engine and the gearbox, and a clutch is provided between the methanol engine and the ISG.
Illustratively, before the obtaining the current rotation speed of the methanol engine, the method includes:
a1, monitoring the real-time working condition of a vehicle;
a2, outputting a demand instruction of engine shutdown to a whole vehicle controller to respond to the demand instruction and stop the engine operation if the vehicle is in a preset working condition;
The preset working conditions comprise at least one of a vehicle static working condition, an ISG-free forward driving torque working condition and a working condition that a clutch between the ISG and the engine is in a connection state.
Before the current rotating speed of the methanol engine is obtained, the real-time working condition of the vehicle, namely the working condition of the vehicle, is required to be monitored, whether the working condition of the vehicle is in a preset working condition or not is judged, the preset working condition is the working condition conforming to the stopping strategy of the methanol engine, and if the working condition conforms to the working condition, the stopping requirement instruction of the methanol engine is output, so that the methanol engine stops working.
The preset working conditions comprise a vehicle static working condition, an ISG-free forward driving torque working condition, a clutch between the ISG and the methanol engine being in a connection state and the like, and it is understood that the vehicle static working condition refers to the vehicle being in an undriven state or an idling state; the working condition without ISG forward driving torque means that ISG does not have forward driving torque, and at the moment, the driving direction of the ISG is opposite to the driving direction of the methanol engine so as to drag the methanol engine to slow down and achieve the purpose of stopping through the ISG; the clutch between the ISG and the methanol engine is in a connection state, namely the rotating shaft of the methanol engine is in powerful connection with the ISG, so that the inertia force of the methanol engine can be fully fed back and utilized, and the generated electric energy is stored in the ISG, a high-voltage battery or a high-voltage energy storage device to provide power for ISG driving of a subsequent vehicle, thereby avoiding energy loss and waste in the shutdown process of the methanol engine and achieving the effects of energy conservation and energy storage. If the clutch between the ISG and the methanol engine is not in a connecting state working condition, namely the clutch between the ISG and the methanol engine is disconnected, and the vehicle is in a traditional stop state, the inertia force of the methanol engine is gradually consumed by a traditional mode, so that the methanol engine and the vehicle are stopped.
After detecting the stop requirement of the methanol engine, the fuel injection of the methanol engine is firstly forbidden, then whether a clutch between the ISG and the methanol engine is connected is judged, if the clutch is in a connection state, whether the ISG has forward driving torque is judged, and if the ISG does not have forward driving torque, the ISG is dragged by utilizing the inertia force of a crankshaft of the methanol engine to generate electricity, so that more accurate generated energy is obtained.
The preset operating condition is the ISG-free forward driving torque operating condition, and if the vehicle is in the preset operating condition, the method includes:
Step A21, judging whether the ISG has the forward driving torque, wherein the forward driving torque is consistent with the driving force of the vehicle;
step A22, if not, the vehicle is in the ISG-free forward driving torque working condition;
And step A23, if yes, the vehicle is in a traditional stop state.
When the preset working condition is the ISG-free forward driving torque working condition, judging whether the vehicle is in the preset working condition, namely judging whether the ISG has forward driving torque, wherein the forward driving torque refers to the torque direction consistent with the driving force of the vehicle, and is called as positive torque for short, and belongs to vectors.
When the ISG of the vehicle does not have the forward driving torque, the vehicle is determined to be in the working condition without the ISG forward driving torque, and then the ISG can be dragged to generate electricity by utilizing the inertia force of the crankshaft of the methanol engine, and the ISG generates negative torque to drag the methanol engine to slow down until the vehicle stops.
When the ISG of the vehicle has the forward driving torque, it is determined that the vehicle is in a conventional stopped state, and then the inertia force of the methanol engine is gradually consumed in a conventional manner, so that the methanol engine and the vehicle are stopped.
And step S120, determining a target feedback torque according to the rotating speed level of the current rotating speed, and sending the target feedback torque to an ISG controller so that the ISG controller controls the ISG to generate torque opposite to the engine, and dragging the engine to stop step by step.
In the process of dragging the methanol engine to stop based on negative torque generated by ISG, in order to ensure the stability of the stop, the shaking problem during vehicle stop is avoided, and the methanol engine is gradually decelerated until the methanol engine is dragged to stop by setting corresponding negative torques of different grades at different rotating speed points of the methanol engine. The negative torque corresponding to different rotating speed points of the methanol engine is the optimal torque obtained through the test calculation of the rotating inertia and acceleration and deceleration parameters corresponding to the rotating speed points, so that the ISG electric quantity generated by the optimal torque is more accurate and more in line with the preset electric quantity, the optimal feedback electric quantity is obtained, and the effect of accurate energy storage is achieved.
Specifically, the current rotating speed of the methanol engine is monitored, target feedback torque in at least one negative torque is determined according to the current rotating speed, the target feedback torque is sent to an ISG controller, the ISG controller is controlled to generate torque opposite to the methanol engine after responding to the target feedback torque, namely the negative torque, wherein the specific torque value of the negative torque is the value of the target feedback torque, and therefore the methanol engine is dragged by the ISG to stop step by step.
In an example, the determining a target feedback torque according to the rotation speed level of the current rotation speed, and sending the target feedback torque to an ISG controller, so that the ISG controller controls the ISG to generate a torque opposite to the engine, and drags the engine to stop step by step, includes:
step B1, a preset torque mapping table is obtained;
step B2, based on the torque mapping table, acquiring the torque corresponding to the current rotating speed to obtain the target feedback torque;
And B3, sending the target feedback torque to an ISG controller so that the ISG controller controls the ISG to generate torque opposite to the engine, and dragging the engine to stop step by step.
The process of determining the target feedback torque through the current rotating speed of the methanol engine is obtained through a preset torque mapping table, so that the preset torque mapping table is obtained, the torque mapping table comprises the rotating speed of the engine and the ISG feedback torque, and the rotating speed of the engine and the ISG feedback torque are in one-to-one correspondence. And matching the current rotating speed with the torque mapping table to obtain the rotating speed of the engine corresponding to the current rotating speed in the torque mapping table, and searching the corresponding ISG feedback torque through the rotating speed point to obtain the target feedback torque.
And sending the target feedback torque to the ISG controller so that the ISG controller generates torque opposite to the methanol engine and drags the methanol engine to stop.
Exemplary, before the obtaining the preset torque mapping table, the method includes:
And step C1, establishing the torque mapping table according to the engine speed and preset ISG feedback torque, wherein the ISG feedback torque is calculated based on the engine speed of the engine.
The torque map is established through the engine speed and preset ISG feedback torque, the setting of the ISG feedback torque corresponding to different engine speeds is calculated based on the engine speed, and the greater the engine speed, the greater the ISG feedback torque. It will be appreciated that the greater the current speed of the methanol engine, the greater the target feedback torque of the ISG.
By way of example, torque values corresponding to different engine speeds are obtained through a preset torque calculation model, a torque map is established through at least one engine speed and at least one torque value, it is to be noted that a point for acquiring or detecting the engine speed is determined according to a detection frequency, for example, a methanol engine speed is detected every 10ms, a value of 100 engine speeds is obtained when the engine needs 1s from the speed at which fuel injection is stopped to the stop completion, each methanol engine speed is subjected to the torque calculation model to obtain a corresponding torque value, that is, the number of ISG feedback torques is 100, and the torque map is established through a mapping relation between 100 engine speed values and 100 ISG feedback torques.
In practical application, in order to reduce storage, calculation force and response speed, a plurality of rotation speed points can be selected from at least one engine rotation speed, and ISG feedback torque corresponding to the rotation speed points is fixed, so that when the current speed of the vehicle is at the rotation speed point, a determined target feedback torque is obtained, a step-by-step deceleration process of the methanol engine is realized, and the whole vehicle is kept to stop steadily.
In the process, as the ISG feedback torque is obtained through the torque calculation model and is the optimal torque corresponding to the engine speed, when the ISG is dragged to rotate through the methanol engine, the optimal feedback electric quantity can be obtained, and the energy storage effect of the maximum feedback electric quantity is improved. Wherein, the positive correlation between the optimal torque and the optimal feedback electric quantity.
The step of obtaining the target feedback torque by obtaining the torque corresponding to the current rotation speed based on the torque mapping table comprises the following steps:
step B21, matching the current rotating speed with the rotating speed of the engine in the torque mapping table based on the torque mapping table to obtain the rotating speed grade;
and step B22, obtaining corresponding target feedback torque according to the rotating speed grade.
And selecting part of engine rotational speed from at least one engine rotational speed and at least one ISG feedback torque as rotational speed points, determining ISG feedback torque corresponding to the rotational speed points, and thus establishing a torque mapping table, wherein the rotational speed points refer to critical values in a certain range, the ISG feedback torque in the rotational speed point range is a fixed constant, and it can be understood that the fixed constant is calculated or selected according to the ISG feedback torque corresponding to the rotational speed point range, so that the speed judging process of the methanol engine is divided into at least one grade, namely rotational speed grade, based on the rotational speed points, and different rotational speed grades correspond to different ISG feedback torques.
The lower the rotation speed level, the smaller the ISG feedback torque, until the ISG feedback torque is zero, the methanol engine is stopped. Specifically, when the current rotation speed of the methanol engine meets a certain rotation speed level, the ISG obtains a corresponding ISG feedback torque, that is, a target feedback torque corresponding to the current rotation speed, and the target feedback torque is started to the ISG controller, so that the ISG generates a negative target feedback torque, the methanol engine is stopped, and the ISG generates power.
Illustratively, the sending the target feedback torque to the ISG controller, so that the ISG controller controls the ISG to generate a torque opposite to the engine, and dragging the engine to stop step by step includes:
Step B31, sending the target feedback torque to the ISG controller so that the ISG generates a torque opposite to the engine, and the torque gradually decreases with time;
And B32, monitoring the engine rotating speed in real time, and finishing the stopping of the engine when the engine rotating speed is zero and the target feedback torque is zero.
And sending target feedback torque to the ISG controller, controlling the ISG to generate torque opposite to the methanol engine, namely negative torque opposite to the driving direction of the vehicle, wherein the torque gradually decreases along with the time change, so that the purpose of gradually reducing the rotating speed of the methanol engine and stably stopping the vehicle is realized. And in the methanol engine deceleration process, monitoring the engine rotating speed in real time, and when the engine rotating speed is zero and the target feedback torque is zero, disconnecting the clutch between the methanol engine and the ISG, and stopping the methanol engine.
The set rotation speed points are N 1、N2、N3 and 0, wherein 0< N 3<N2<N1, and N is the engine rotation speed of the methanol engine; the ISG feedback torque is set to be T 1、T2、T3 and 0, wherein 0< |T 3|<|T2|<|T1 |, T 3、T2、T1 <0, and T is the ISG feedback torque. When the current rotation speed of the methanol engine is greater than or equal to N 1, the ISG feedback torque is T 1, when the engine rotation speed of the methanol engine is greater than or equal to N 2 and less than N 1, the ISG feedback torque is T 2, when the engine rotation speed of the methanol engine is greater than or equal to N 3 and less than N 2, the ISG feedback torque is T 3, and when the engine rotation speed of the methanol engine is less than N 3, the ISG feedback torque is 0. The current rotating speed of the methanol engine is obtained, the current rotating speed is judged to be in which range or grade, and ISG feedback torque corresponding to the grade is used as target feedback torque to be sent to an ISG controller, so that the ISG generates negative torque corresponding to the target feedback torque. It should be noted that, when the current rotation speed of the methanol engine gradually decreases along with the change of time and the changed current rotation speed meets different rotation speed grades, different corresponding target feedback torques are obtained, and the ISG generates different negative torques so as to gradually slow down the methanol engine until the current rotation speed of the methanol engine is 0 and the target feedback torque is 0, at this time, the clutch between the methanol engine and the ISG is disconnected, and the methanol engine is stopped.
Compared with the prior art, the method has the advantages that when the stopping requirement of the methanol engine is detected, the current rotating speed of the methanol engine is obtained; and determining a target feedback torque according to the rotating speed grade of the current rotating speed, and sending the target feedback torque to an ISG controller so that the ISG generates torque opposite to the methanol engine, and dragging the methanol engine to stop step by step. It can be understood that the application sets the corresponding target feedback torque according to the current rotation speed of the methanol engine, the ISG responds to the target feedback torque to generate the torque opposite to the rotation direction of the methanol engine so as to drag the methanol engine to stop, in the process, the methanol engine is gradually decelerated by combining with the current state of the methanol engine until the methanol engine stops, the stable stopping process is ensured, meanwhile, the ISG is dragged by the inertia force of the crankshaft of the methanol engine to generate electricity, and in the process of gradually decelerating the methanol engine, the maximum feedback electric quantity is obtained through the target feedback torque which is gradually changed, so that the effects of stability, energy saving and energy storage in the stopping process of the methanol engine are realized.
Based on the above-described first embodiment, a second embodiment of the engine stop control method of the present application is proposed, in which the engine stop control method further includes:
the ISG feedback torque corresponding to the engine speed is determined by the following steps:
(1) Torque calculation formula: t=j×a; wherein J is moment of inertia (constant), and a is angular acceleration;
(2) Angular velocity calculation formula: ω 1＝ω0 +a Δt; wherein ω 0 is the angular velocity at time T 0 and ω 1 is the angular velocity at time Δt;
(3) According to the relation between the rotating speed and the angular speed: n=ω/2pi, and ω 0＝2π*n0,ω1＝2π*n1 is obtained; wherein n 0、n1 is the rotation speed at time t 0、t1;
Bringing the formulas in (1) and (3) into (2) to obtain 2pi+n 1＝2π*n0 +T+Deltat/J;
Obtaining n 1＝n0 plus delta T/(2pi×J) according to the calculation; since the vehicle controller calculates the engine speed once per cycle, n 0 may be equivalent to the engine speed acquired at time t i, i=0, 1,2 … … k, n1 is equivalent to the target engine speed at time t k, n k＝ni+△t*Ti/(2pi×j). The calculation cycle of the engine speed is set according to the actual demand, and the smaller and finer the calculation cycle is, but the lower the amount of electricity or power generation is simultaneously generated, the lower the relative practicality is, therefore, the appropriate calculation cycle is selected according to the actual demand, and the specific limitation is not made here.
Therefore, the torque calculation model for calculating ISG feedback torque corresponding to different engine speeds is:
T i＝(nk-ni)*2π*J/△ti … … is formula one;
Wherein, T i is the generated torque (i.e. feedback torque) of the ISG at time T i, n i is the actual rotation speed of the methanol engine collected at time T i, Δt i is the time interval from T i to T k, and n k is the final desired target value. It will be appreciated that in the case of a methanol engine shutdown requirement, n k is typically 0, and n k may also be an acceptable error range value based on 0 due to the accuracy requirements in actual operation. In different application scenarios, n k has different target values, which are not specifically limited herein.
According to the formula I, the T value of ISG feedback torque corresponding to different engine speeds is obtained, as shown in the following formula I:
Table one: engine speed and ISG feedback torque T values.
The method comprises the steps of setting up to judge and decelerate the current rotating speed of a methanol engine step by step, selecting a selecting period of judging and decelerating step by step according to actual demands, and taking the engine rotating speed n and corresponding ISG feedback torque acquired in every n calculating periods as one grade of engine rotating speed and ISG feedback torque if the selecting period is m calculating periods. Specifically, if m=3, it is determined that N 1＝n1, that is, the engine speed corresponding to the N 1 point is the speed point N 1, then T 1＝(nk-n1)*2π*J/△t1;n2、n3、n4 is one grade, the median N 3 is selected from N 2、n3、n4 as the speed point N 2, the setting modes of the speed points N of other grades are basically the same, if not described herein, the torque T value calculated by the T value of the ISG feedback torque corresponding to the speed point N 2 is N 3, that is, T N2＝(nk-n3)*2π*J/△t3;nk is taken as the final desired target value, and is set as the final speed point N k, then the ISG feedback torque corresponding to N k is set as 0, where the set number of speed points is determined according to a selection period and a calculation period, for example, 1s is required for the engine speed to be reduced from the initial speed to zero, the calculation period is 1ms (each 1ms is acquired for engine speed), then k=100, if the selection period is taken as m, then the number of speed points= (100-2)/m is taken, and other speed point selection modes and numbers can be set according to the actual requirements, which are not limited.
For example, when m is an odd number, the engine rotation speed points are ordered according to the acquisition time of N 1、n2、n3、n4……nk, ni corresponding to the median is selected from the selected period as the ISG feedback torque corresponding to the rotation speed point N i,i＝0、1、2……k,Ni, and the ISG feedback torque is a torque T value calculated based on N i and formula one; when m is even, the engine rotating speed points are ordered according to the acquisition time of N 1、n2、n3、n4……nk, two engine rotating speeds N i-1、ni+1 close to the median are selected from the selection period, the average value of the two engine rotating speeds is calculated, the ISG feedback torque corresponding to the rotating speed point N i,i＝0、1、2……k,Ni is the average value of the two torque T values calculated based on N i-1、ni+1 and a formula I, and therefore different rotating speed points and different ISG feedback torques corresponding to the rotating speed point intervals are determined, and the purpose of gradual speed reduction of the methanol engine is achieved.
In the embodiment, through an engine rotating speed, rotating inertia and torque calculation model, the optimal torque corresponding to different rotating speed points is calculated, so that the stable stopping of the whole vehicle is realized, the optimal feedback electric quantity is obtained by the ISG through the optimal torque, and the effects of high efficiency, energy saving and accurate energy storage are realized.
Exemplary, as shown in fig. 2, the present application also provides an engine stop control device including:
a rotation speed obtaining module 10, configured to obtain a current rotation speed of an engine when a stop requirement of the engine is detected;
And the torque feedback module 20 is configured to determine a target feedback torque according to the rotation speed level of the current rotation speed, and send the target feedback torque to the ISG controller, so that the ISG controller controls the ISG to generate a torque opposite to the engine, and drag the engine to stop step by step.
And/or, the rotation speed acquisition module further comprises:
the monitoring sub-module is used for monitoring the real-time working condition of the vehicle;
And the output sub-module is used for outputting a demand instruction of engine shutdown if the vehicle is in a preset working condition, so that the whole vehicle controller can respond to the demand instruction and stop the engine to work, wherein the preset working condition comprises at least one of a vehicle static working condition, an ISG-free forward driving torque working condition and a working condition that a clutch between the ISG and the engine is in a connection state.
And/or, the output submodule includes:
A judging unit configured to judge whether the ISG has the forward driving torque, wherein the forward driving torque is kept consistent with a vehicle driving force;
And the first determining unit is used for determining whether the vehicle is in the ISG-free forward driving torque working condition or not.
And/or, the torque feedback module comprises:
the first acquisition sub-module is used for acquiring a preset torque mapping table;
the second obtaining submodule is used for obtaining the torque corresponding to the current rotating speed based on the torque mapping table to obtain the target feedback torque;
And the sending sub-module is used for sending the target feedback torque to the ISG controller so that the ISG controller controls the ISG to generate torque opposite to the engine and drags the engine to stop step by step.
And/or, the torque feedback module further comprises:
And the table building sub-module is used for building the torque mapping table according to the engine speed and preset ISG feedback torque, wherein the ISG feedback torque is calculated based on the engine speed of the engine.
And/or, the second acquisition sub-module further comprises:
The matching unit is used for matching the current rotating speed with the rotating speed of the engine in the torque mapping table based on the torque mapping table to obtain the rotating speed grade;
and the acquisition unit is used for acquiring the corresponding target feedback torque according to the rotating speed grade.
And/or, the sending sub-module further comprises:
A transmitting unit configured to transmit the target feedback torque to the ISG controller so that the ISG generates a torque opposite to the engine, the torque gradually decreasing with time;
And the monitoring unit is used for monitoring the engine rotating speed in real time, and when the engine rotating speed is zero and the target feedback torque is zero, the engine stopping is completed.
The specific implementation of the engine stop control device of the present application is basically the same as the above embodiments of the engine stop control method, and will not be described herein.
In addition, the application also provides engine shutdown control equipment. As shown in fig. 3, fig. 3 is a schematic structural diagram of a hardware running environment according to an embodiment of the present application.
In one possible implementation, fig. 3 may be a schematic structural diagram of a hardware operating environment of the engine shutdown control device.
As shown in fig. 3, the engine stop control device may include a processor 701, a communication interface 702, a memory 703 and a communication bus 704, wherein the processor 701, the communication interface 702 and the memory 703 complete communication with each other through the communication bus 704, and the memory 703 is used for storing a computer program; the processor 701 is configured to implement the steps of the engine shutdown control method when executing the program stored in the memory 703.
The communication bus 704 mentioned above for the engine stop control device may be a Peripheral component interconnect standard (Peripheral ComponentInterconnect, PCI) bus or an extended industry standard architecture (Extended Industry StandardArchitecture, EISA) bus or the like. The communication bus 704 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, the figures are shown with only one bold line, but not with only one bus or one type of bus.
The communication interface 702 is used for communication between the engine stop control device and other devices described above.
The Memory 703 may include a random access Memory (Random Access Memory, RMD) or may include a Non-Volatile Memory (NM), such as at least one disk Memory. Optionally, the memory 703 may also be at least one storage device located remotely from the aforementioned processor 701.
The processor 701 may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; but may also be a digital signal Processor (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components.
The specific implementation of the engine stop control device of the present application is basically the same as the above embodiments of the engine stop control method, and will not be described herein.
In addition, the embodiment of the application also provides a computer storage medium, wherein the computer storage medium is stored with a methanol engine stop control program, and the methanol engine stop control program realizes the steps of the engine stop control method when being executed by a processor.
The specific implementation of the computer storage medium of the present application is basically the same as the above embodiments of the engine stop control method, and will not be described herein.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing embodiment numbers of the present application are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, a device, or a network device, etc.) to perform the method according to the embodiments of the present application.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the application, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (10)
1. An engine shutdown control method, characterized in that the method comprises:
when the stop requirement of the engine is detected, acquiring the current rotating speed of the engine;
And determining a target feedback torque according to the rotating speed grade of the current rotating speed, sending the target feedback torque to an ISG controller so that the ISG controller controls the ISG to generate torque opposite to the engine, dragging the engine to stop step by step, wherein the rotating speed grade is at least one grade obtained by dividing the speed judging process of the engine based on a rotating speed point, the rotating speed point is obtained by selecting part of the rotating speeds of the engine based on at least one rotating speed of the engine and at least one ISG feedback torque, the rotating speed point refers to a critical value in a certain range, and the ISG feedback torque in the rotating speed point range is a fixed constant.
2. The method of claim 1, wherein prior to said obtaining a current rotational speed of said engine, comprising:
Monitoring the real-time working condition of the vehicle;
Outputting a demand instruction of engine shutdown when the vehicle is in a preset working condition, so that a vehicle controller responds to the demand instruction and stops the engine;
The preset working conditions comprise at least one of a vehicle static working condition, an ISG-free forward driving torque working condition and a working condition that a clutch between the ISG and the engine is in a connection state.
3. The method of claim 2, wherein the predetermined operating condition is the ISG-free forward drive torque operating condition,
And if the vehicle is in the preset working condition, the method comprises the following steps:
judging whether the ISG has the forward driving torque or not, wherein the forward driving torque is consistent with the driving force of the vehicle;
If not, the vehicle is in the ISG-free forward driving torque working condition.
4. The method of claim 1, wherein the determining a target feedback torque according to the rotation speed level of the current rotation speed, and sending the target feedback torque to an ISG controller, so that the ISG controller controls the ISG to generate a torque opposite to the engine, and dragging the engine to stop step by step, comprises:
acquiring a preset torque mapping table;
based on the torque mapping table, acquiring torque corresponding to the current rotating speed, and obtaining the target feedback torque;
and sending the target feedback torque to an ISG controller so that the ISG controller controls the ISG to generate torque opposite to the engine, and dragging the engine to stop step by step.
5. The method of claim 4, wherein prior to obtaining the predetermined torque map, the method comprises:
And establishing the torque mapping table according to the engine speed and preset ISG feedback torque, wherein the ISG feedback torque is calculated based on the engine speed of the engine.
6. The method of claim 4, wherein the obtaining the target feedback torque based on the torque map to obtain the torque corresponding to the current rotational speed comprises:
Based on the torque mapping table, matching the current rotating speed with the rotating speed of the engine in the torque mapping table to obtain the rotating speed grade;
and obtaining corresponding target feedback torque according to the rotating speed grade.
7. The method of claim 4, wherein said sending said target feedback torque to an ISG controller to cause said ISG controller to control ISG to generate torque opposite said engine, dragging said engine to stop step by step, comprising:
Transmitting the target feedback torque to the ISG controller so that the ISG generates a torque opposite to the engine, wherein the torque gradually decreases with time;
And monitoring the engine rotating speed in real time, and finishing the stopping of the engine when the engine rotating speed is zero and the target feedback torque is zero.
8. An engine stop control device, characterized in that the device comprises:
the rotating speed acquisition module is used for acquiring the current rotating speed of the engine when the stopping requirement of the engine is detected;
the torque feedback module is used for determining a target feedback torque according to the rotating speed grade of the current rotating speed, sending the target feedback torque to the ISG controller so that the ISG controller controls the ISG to generate torque opposite to the engine and drags the engine to stop step by step, wherein the rotating speed grade is at least one grade obtained by dividing the speed judging process of the engine based on a rotating speed point, the rotating speed point is obtained by selecting part of the rotating speeds of the engine based on at least one rotating speed of the engine and at least one ISG feedback torque, the rotating speed point refers to a critical value in a certain range, and the ISG feedback torque in the rotating speed point range is a fixed constant.
9. An engine stop control apparatus comprising a memory, a processor and an engine stop control program stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the engine stop control method of any one of claims 1 to 7.
10. A computer storage medium, characterized in that the computer storage medium has stored thereon an engine stop control program which, when executed by a processor, implements the steps of the engine stop control method according to any one of claims 1 to 7.
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