CN113503351A - Starting control method of hydraulic torque converter - Google Patents
Starting control method of hydraulic torque converter Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H41/00—Rotary fluid gearing of the hydrokinetic type
- F16H41/24—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
- F16H63/42—Ratio indicator devices
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Abstract
The invention discloses a starting control method of a hydraulic torque converter, which divides the hydraulic torque converter into three working states when a system identifies that a vehicle enters a starting working condition: the method comprises the steps of respectively setting target rotating speeds of an engine in a release state, a sliding state and a closing state, wherein the most critical target rotating speed of the engine in the sliding state is not subjected to conventional sliding difference control and is calculated based on a parabolic function, and meanwhile, the target rotating speed calculated in the stage is corrected in real time based on the change rate of the rotating speed of a turbine. The method designs a parabolic function curve of the change of the target rotating speed of the engine along with time in the stage of the sliding-grinding state, and finally the parabolic function curve is tangent to the turbine rotating speed curve, so that the rotating speeds of the locking clutch and the turbine rotating speed curve are the same when the locking clutch is closed, the change rates of the locking clutch and the turbine rotating speed curve are also the same, the impact and the vibration which are easily generated when the hydraulic torque converter is closed are effectively avoided, and the comfort of a vehicle is improved.
Description
Technical Field
The invention belongs to the technical field of automobile control, and particularly relates to a starting control method of a hydraulic torque converter arranged on a vehicle.
Background
A torque converter is an element that transfers power by means of the high speed movement of a fluid. The hydraulic torque converter consists of a pump impeller, a turbine and a guide wheel. The pump wheel is connected with the output shaft of the engine, the mechanical energy of the output shaft of the engine can be converted into the kinetic energy of liquid through the action of centrifugal force, the kinetic energy of the liquid impacts the turbine to act on the blades to push the turbine to rotate together, the turbine obtains certain torque, in addition, the guide wheel is locked in a one-way mode, and due to the fact that the areas of the blades at the inlet and the outlet of the guide wheel are different, the speed and the direction of liquid flow are changed, the momentum moment is changed, and finally the torque conversion effect is achieved.
Since the torque converter has a continuously variable transmission function, a torque conversion function, and a damping function, it is widely used as a transmission device between an engine and a transmission of a vehicle.
The operating state of a torque converter is generally divided into three states: a release state, a sliding state and a closing state. The release state is that the locking clutch does not transmit torque, and the torque is transmitted between the engine and the transmission completely through a hydraulic torque conversion mode; the slipping state is a state in which the lock-up clutch is in a half-engaged state to maintain a certain slip; the closed state is a state in which the lock-up clutch is completely closed and the engine torque directly transmits the torque of the engine to the transmission. The three states are realized by changing the pressure of the unlocking cavity and the pressure of the locking cavity.
In patent documents CN108603592B CN101109441B CN100375855C CN1002235498B and the like, it is mainly stated that a torque converter executes a slip control based on a target slip difference and an enabling condition thereof, and that an open-loop or closed-loop control is adopted in the slip control process to adapt to a vehicle load change, and that a slip state and a pressure difference across a lock-up clutch in the closed state are controlled based on an engine torque change.
During vehicle launch, the lock-up clutch is typically slip-controlled to improve transmission efficiency and improve vehicle fuel consumption. And the slip control means controlling oil pressure on two sides of the locking clutch through a PI algorithm based on the target slip control quantity to enable the actual slip difference on two sides of the clutch to approach the target slip control quantity. Because the target slip friction difference only emphasizes the rotation speed difference of two engaged sides of the lock-up clutch, and the deep research is not carried out on the change rate of the rotation speed of the two engaged sides, the possibility of impact vibration still exists when the lock-up clutch is closed, and meanwhile, the PI controller only carries out feedback control of proportional and integral control, so that the change rate of the turbine rotation speed can obviously change when the engine torque is greatly changed or the vehicle load is greatly changed, and the problem that the deviation between the actual slip friction difference and the target slip friction control quantity is increased exists at the moment.
Therefore, a starting control method of the hydraulic torque converter is needed to overcome the problem that the deviation between the actual slip difference and the target slip control amount is increased when the change rate of the turbine rotating speed exceeds the set interval, so that the starting power responsiveness is improved.
Disclosure of Invention
Technical problem to be solved
Based on the above, the invention discloses a starting control method of a hydraulic torque converter, which can solve the problem that the deviation between the actual sliding friction difference and the target sliding friction control amount is increased when the change rate of the turbine rotating speed exceeds a set interval, thereby improving the starting power responsiveness and comfort without increasing redundant hardware cost.
(II) technical scheme
The invention discloses a starting control method of a hydraulic torque converter, which enters a starting control process of the hydraulic torque converter when a whole vehicle recognizes a starting working condition, wherein the hydraulic torque converter in the starting control process of the hydraulic torque converter sequentially comprises three working states: a release state, a slide-wear state, a close state, when detectedWhen the hydraulic torque converter enters the slip state from the release state, locking the target engine speed value n when the hydraulic torque converter enters the slip state from the release state1Turbine speed value ntu1And rate of change of turbine speed gtuTo calculate a parabolic function n of the target engine speed over time t over the entire slip statedes(ii) a Said parabolic function ndesThe target rotating speed value n of the engine when the control is in a sliding state1Calculate for the vertex.
Further, a parabolic function n of the target engine speed in the slip statedesCalculated from two points, the vertex of the parabola and the point tangent to the turbine speed, ndesThe functional relationship of (a) is:
further, the starting conditions of the starting condition include:
1) whether the opening degree of an accelerator pedal is not lower than a first set threshold value;
2) the turbine speed is not higher than a second set threshold;
3) the current gear is in a starting gear.
The condition that the whole vehicle is in the starting condition can be judged only if the three conditions are simultaneously met.
Further, in the slip state, it is judged that the change rate of the turbine rotational speed is relative to the change rate g of the turbine rotational speed locked at the time of immediately entering the slip state controltuIs greater than a third set threshold, and if so, a parabolic function n of the engine target speeddesOutputting after carrying out secondary correction based on the change rate of the turbine speed, if not, still according to the parabolic function n of the target engine speeddesAnd outputting the data.
Further, the starting control process of the hydraulic torque converter further comprises:
in the release state, the speed ratio of the hydraulic torque converter is judged to be larger than a set threshold value and is kept for a certain time, and if the speed ratio of the hydraulic torque converter is larger than the set threshold value, the hydraulic torque converter is judged to be in the release stateThe hydraulic torque converter enters a slip state, and a parabolic function n of the target rotating speed of the engine is calculated and outputdesIf not, the hydraulic torque converter is still in a release state;
in a sliding state, judging that the difference between the rotating speed of the engine and the rotating speed of the turbine is smaller than a set threshold value and keeping for a certain time, if so, controlling the hydraulic torque converter to enter a closed state, and directly assigning the target rotating speed of the engine by the rotating speed of the turbine; if not, the hydraulic torque converter is still in the slip state control.
Further, the engine target rotation speed in the released state is set based on the accelerator opening degree while being corrected by the environmental condition factor.
In another aspect, the present invention also discloses a start control device for a torque converter, including: at least one processor; and at least one memory communicatively coupled to the processor, wherein: the memory stores program instructions executable by the processor, and the processor invokes the program instructions to implement a method of controlling a launch of a torque converter as described in any of the above.
In another aspect, the present invention also discloses a non-transitory computer-readable storage medium storing computer instructions that cause a computer to execute a take-off control method of a torque converter according to any one of the above.
(III) advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
(1) the starting control method can improve the starting dynamic rotating speed control performance of the vehicle, the working state of the hydraulic torque converter is a release state firstly, and the locking clutch is in a complete release state by controlling the oil pressure at two sides of the locking clutch, so that the rotating speed of the engine can be quickly improved to a target rotating speed position; secondly, controlling a sliding state, wherein in the state, the target rotating speed of the engine is output in a parabola shape with an upward opening along with time, oil pressure on two sides of the lockup clutch is controlled in a closed loop mode through a PI algorithm, the rotating speed of the engine is controlled to follow the target rotating speed, finally the parabola is tangent to a trend line of the change of the rotating speed of the turbine along with the time, and the tangent point is characterized in that the rotating speed of the engine is equal to the rotating speed of the turbine, and the change rates of the rotating speed of the engine and the turbine are also equal, so that the target rotating speed of the engine is in the parabola shape with the upward opening, and the impact or vibration generated when the lockup clutch is closed can be effectively solved; and finally, the locking clutch is in a closed state, and oil pressure at two ends of the locking clutch is controlled to enable the locking clutch to be in a compression state.
(2) The method of the invention can obtain the target rotating speed value n of the engine through easy obtaining1Turbine speed value ntu1And parameters such as the change rate of the turbine rotating speed and the like are quickly calculated to obtain a parabola of the target rotating speed of the engine in the sliding grinding stage, so that the actual rotating speed change of the engine is controlled based on the target rotating speed of the engine to optimize the engagement impact, the rotating speed change rate of the target rotating speed of the engine is equal to the rotating speed change rate of the output shaft when the lock-up clutch is closed, in addition, the target rotating speed is corrected based on the real-time change rate of the turbine rotating speed to adapt to the change of the engine torque and the load of the whole vehicle, the starting power responsiveness is greatly improved, and the redundant hardware cost is not required to be increased.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
FIG. 1 is a schematic diagram of a system configuration to which a method for controlling a start of a torque converter with a lockup clutch according to the present invention is applied;
FIG. 2 is a schematic diagram of relevant signals during a launch control process according to the present invention;
FIG. 3 is a schematic diagram illustrating the initialization of calculating the target engine speed at the stage of the slip state during the starting control process according to the present invention;
FIG. 4 is a logic flow diagram of a parabolic calculation of the target engine speed during launch control of the present invention;
FIG. 5 is a logic flow diagram for determining a starting condition of the present invention;
FIG. 6 is a logic flow diagram of the present invention for correcting engine target speed during a coast-down phase.
The respective labels in fig. 1 are:
11-an engine; 12-a turbine; 13-a pump impeller; 14-a transmission; 15-a lock-up clutch; 16-a guide wheel; 17-an electromagnetic valve; and 18, a controller.
Detailed Description
The present invention will be described more fully hereinafter with reference to the accompanying drawings and examples, in which the technical problems and advantages of the present invention are solved, wherein the described examples are only intended to facilitate the understanding of the present invention, and are not to be construed as limiting in any way.
The control method of the invention is particularly applied to the classical whole vehicle transmission system shown in figure 1,
the hydraulic torque converter is provided with a locking clutch, the working state of the locking clutch is controlled by the pressure combination of a locking cavity and an unlocking cavity, the output of an engine crankshaft is mechanically connected with an input shaft of the hydraulic torque converter, an engine 11 rotates to drive the whole shell of the hydraulic torque converter to rotate, a pump impeller 13 is fixedly connected with the shell of the hydraulic torque converter, oil in the hydraulic torque converter impacts a turbine 12 through the centrifugal force of the pump impeller 13, liquid passing through a guide wheel 16 impacts the turbine 12, so that the mechanical energy of the pump impeller is converted into the mechanical energy of the liquid, then the mechanical energy of the liquid is converted into the mechanical energy of a turbine, the output shaft of the turbine is fixedly connected with the input shaft of a transmission, and finally the power is transmitted to the transmission 14. The controller 18 controls the electromagnetic valve 17 to output the pressure of the locking cavity and the pressure of the unlocking cavity of the locking clutch 15, and three working states of releasing, sliding and closing in the starting stage of the hydraulic torque converter are realized by adjusting the pressure of the unlocking cavity and the pressure of the locking cavity. In a release state, the pressure of the unlocking cavity is greater than that of the locking cavity, and the rotating speed of the engine is quickly increased to a specified target rotating speed; in a sliding-grinding state, the pressure of an unlocking cavity is mainly adjusted to realize half-joint sliding grinding of the locking clutch so as to control the actual rotating speed of the engine to change along with the target rotating speed of the engine; in a closed state, the pressure of the locking cavity is increased to close the locking clutch, and finally the rotating speed of the engine is the same as that of the turbine, so that the whole starting control process is completed.
Characteristic parameters such as a torque ratio, a torque coefficient and efficiency of the hydraulic torque converter change along with the speed ratio of the hydraulic torque converter, and when the hydraulic torque converter can not provide torque conversion performance any more in the starting condition control process, a mode of closing a locking clutch is adopted to improve transmission efficiency and reduce energy loss. However, because the rotational inertia of the engine is large, when the control of the lock-up clutch is not good, obvious impact and vibration are easily generated when the lock-up clutch is closed, so that the closing process of the hydraulic torque converter becomes the key point and the difficulty of the control of the hydraulic torque converter, namely the sliding friction state control process of the hydraulic torque converter, and therefore, the starting control method of the hydraulic torque converter becomes the key problem which is mainly solved by the invention.
In order to implement the starting control method of the torque converter of the present invention, the system includes: the pressure of the locking clutch and the unlocking cavity and the locking cavity on the two sides of the locking clutch are controllable; a solenoid valve for controlling the oil pressure of the lock chamber and the oil pressure of the unlock chamber; and a torque converter control unit. The starting control method enters a starting control process of the hydraulic torque converter when the whole vehicle recognizes a starting working condition.
Fig. 2 is a schematic diagram of relevant signals in the starting control process. The three operating states of the torque converter launch control process are illustrated: a release state, a sliding state and a closing state. In the release state control process, the pressure of the unlocking cavity is higher than that of the locking cavity by increasing the pressure of the unlocking cavity, so that the hydraulic torque converter is in complete hydraulic coupling, the rotating speed of an engine can be quickly increased, and the starting power responsiveness can be improved by utilizing the torque converter torque-changing performance. When the hydraulic torque converter is detected to be incapable of providing effective torque performance, slip state control is carried out, the pressure of a locking cavity is rapidly increased to a pressure value corresponding to the current engine torque, meanwhile, the unlocking pressure is increased to the pressure value, then the actual rotating speed of the engine is enabled to follow the target rotating speed of the engine to operate by adjusting the unlocking pressure based on a closed-loop algorithm of the slip state control, and finally the purpose of synchronizing the rotating speed of the engine and the rotating speed of the turbine is achieved. And when the engine rotating speed and the turbine rotating speed are monitored to be synchronous, increasing the locking pressure to complete the closing of the locking clutch, wherein the state is the closing state of the hydraulic torque converter.
In the starting process of a vehicle, the working state of the hydraulic torque converter is a release state firstly, and the locking clutch is in a complete release state by controlling oil pressure on two sides of the locking clutch, so that the rotating speed of an engine can be rapidly increased to a target rotating speed position; secondly, controlling a sliding state, wherein in the state, the target rotating speed of the engine is output in a parabola shape with an upward opening along with time, oil pressure on two sides of the lockup clutch is controlled in a closed loop mode through a PI algorithm, the actual rotating speed of the engine is controlled to follow the target rotating speed of the engine, finally the parabola is tangent to a trend line of the change of the rotating speed of the turbine along with the time, and the tangent point is characterized in that the rotating speed of the engine is equal to the rotating speed of the turbine, and the change rates of the engine and the turbine are also equal, so that the target rotating speed of the engine is in the parabola shape with the upward opening, and the impact or vibration generated when the lockup clutch is closed can be effectively solved; and finally, the locking clutch is in a closed state, and oil pressure at two ends of the locking clutch is controlled to enable the locking clutch to be in a compression state.
The target engine speed value setting during the starting process is set according to three operating states of the torque converter. In the release state, an engine target rotation speed basic value is set based on the opening degree of an accelerator pedal, an offset is added to an engine idle speed value to serve as a lower limit value of the target rotation speed, and the output target basic value is corrected by factors such as various environmental conditions including engine water temperature and altitude. In the stage of the sliding grinding state, the target rotating speed of the engine changes along with time and tends to be a parabola with an upward opening, the vertex of the parabola is the target rotating speed value of the engine which is fixed at the moment of entering the sliding grinding state control, the parabola is tangent to the predicted trend line of the rotating speed of the turbine changing along with time, and the parameters of the parabola are determined by two points of the tangent point and the vertex. In the process of controlling the sliding state, the final target value of the engine speed is the result of the calculation value and the correction value of the parabola along with the time. The correction value is a correction coefficient obtained based on the change of the engine torque and the change of the turbine speed brought by the load change of the whole vehicle. The condition for entering the slip state control is that when the speed ratio of the hydraulic torque converter reaches a certain value in the starting process, the torque conversion performance is no longer advantageous and enters a high-efficiency area, and at the moment, the slip state control is executed. In the stage of the closed state, the target rotating speed value of the engine is replaced by the rotating speed of the turbine, and when the difference between the rotating speed of the engine and the rotating speed of the turbine is monitored to be smaller than a certain value and lasts for a certain time, the oil pressure of the locking cavity is increased, so that the locking clutch is completely locked.
The target rotating speed of the engine calculated by the parabolic function in the stage of the sliding-grinding state is the target rotating speed value of the engine, the rotating speed of the turbine and the change rate of the rotating speed of the turbine at the moment of locking after the hydraulic torque converter enters the sliding-grinding state from the releasing stage; the parabolic function is calculated from the beginning of timing when the sliding state control is started, and a point corresponding to the target rotating speed of the engine when the sliding state control is started is taken as the vertex of the parabola; the parabolic function is calculated from the above three lock values of the engine target speed value, the turbine speed, and the turbine speed change rate. It should be noted that the above calculation method of the parabolic function is one of the optimal methods in the present invention, and is not the only calculation method of the parabola.
Fig. 3 shows an initialization process for calculating the target engine speed in the stage of the slipping state, so as to illustrate a specific calculation manner that the target engine speed trends to be a parabolic shape with an upward opening over time:
and when the speed ratio of the hydraulic torque converter is detected to be larger than the set threshold value and is maintained for a certain time, the control of the sliding state is started. Since the torque converter can no longer convert torque at this time, if the engine torque and the engine load do not change significantly, the turbine speed change rate can be considered as a constant value. For the calculation mode of the parabolic function, the shape of the parabola can be determined only by determining the vertex of the parabola and the position of one point. When the system detects that the hydraulic torque converter enters a sliding mode control process, namely the engine target rotating speed value n when the hydraulic torque converter enters a sliding-grinding state from a release state is locked1The value n of the turbine speed when entering the slip state from the release statetu1And rate of change of turbine speed gtuAnd starting to time, and if the horizontal axis is time and the vertical axis is rotating speed, the vertex coordinate of the parabola is (0, n)1). Turbine speed up to n1The time taken is t1Then, then
Taking the tangent point (2 t) of the parabola and the turbine speed curve1,ntu2) Is another point of the parabola, where ntu2＝2n1-ntu1From this, the target engine speed n can be determined during the slip phasedesAs a function of time t, is
It follows that only n needs to be known when entering the slip control1、ntu1、gtuThe trend of the entire parabola over time can be determined.
The whole starting control strategy is shown in fig. 4, whether the vehicle enters the starting working condition control or not is judged firstly, if the vehicle enters the starting control, the vehicle enters the stage control of the release state of the hydraulic torque converter, the target rotating speed of the engine at the stage is set mainly based on the opening degree of an accelerator pedal, and if the judgment condition is not met, the target rotating speed of the engine in the starting process is not calculated by the controller. During the stage control of the release state, if the speed ratio of the hydraulic torque converter is judged to be larger than the set threshold value and is kept for a certain time, the hydraulic torque converter is judged to enter the slip state control, namely, the parabolic calculation mode shown in the figures 2-3 is used for controlling and calculating the target rotating speed of the engine, if the judgment condition is not met, the hydraulic torque converter is still in the stage control of the release state, and the target rotating speed of the engine is determined by the opening degree of the accelerator pedal. During the control in the sliding state (namely the target rotating speed of the engine in the sliding state is a parabolic function), if the difference between the rotating speed of the engine and the rotating speed of the turbine is judged to be smaller than a set threshold value and is kept for a certain time, the hydraulic torque converter enters the closed state control, the target rotating speed of the engine in the state is directly assigned by the rotating speed of the turbine, and if the judgment condition is not met, the hydraulic torque converter is still in the sliding state control.
In the above starting control strategy, it is necessary to determine whether the entire vehicle enters a starting condition, and the module determination logic is as shown in fig. 5, and it is necessary to determine the following three conditions: whether the opening degree of an accelerator pedal of a first condition is not lower than a first set threshold, the rotating speed of a turbine of a second condition is not higher than a second set threshold, and a current gear of a third condition is in a starting gear.
As shown in fig. 6, the above parabolic calculation of the target engine speed based on the parabola is designed and output on the premise that the engine torque and the load of the whole vehicle do not change greatly, and if the engine torque and the load of the whole vehicle change greatly, the change rate of the turbine speed is likely to change obviously in the control stage of the sliding state. For this case, n can be modified by the decision logic given in FIG. 6desWhen in the sliding state, n is calculated for the first timedesAnd then, continuously judging whether the deviation degree of the turbine speed change rate relative to the locked turbine speed change rate at the time of just entering the slip state control is larger than a third set threshold value (or whether the deviation degree is not changed in a set interval), if so, performing a parabolic function n of the target engine speeddesCarrying out secondary correction based on the change rate of the turbine speed and outputting, if not, still according to the previous parabolic function n of the target engine speeddesAnd outputting the data. Said parabolic function ndesThe second correction based on the turbine speed change rate is performed by reacquiring the turbine speed change rate g which does not change within a preset setting intervaltuTo calculate a parabolic function ndesSo as to ensure the effectiveness of the parabolic function when the load of the whole vehicle is greatly changed.
It is worth mentioning that the control method of the hydraulic torque converter designs a parabolic function curve of the change of the target rotating speed of the engine along with time in the stage of the sliding state, the parabola is finally tangent to the rotating speed curve of the turbine, so that the rotating speeds of the lock-up clutch and the turbine are ensured to be the same when the lock-up clutch is closed, the change rates of the lock-up clutch and the turbine are also ensured to be the same, the impact and the vibration which are easily generated when the hydraulic torque converter is closed are effectively avoided, the comfort of a vehicle is improved, the calculation mode is simple and reliable, and the hardware cost is not required to be increased.
In the embodiments provided in the present invention, it should be understood that the disclosed control method and apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit. The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Finally, the description is as follows: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A starting control method of a hydraulic torque converter is characterized in that the starting control method enters a starting control process of the hydraulic torque converter when a starting working condition of a finished automobile is identified, and the hydraulic torque converter in the starting control process of the hydraulic torque converter sequentially comprises three working states: a release state, a slip state and a close state, and is characterized in that when the torque converter is detected to enter the slip state from the release state, the target engine speed value n when the torque converter enters the slip state from the release state is locked1Turbine speed value ntu1And rate of change of turbine speed gtuTo calculate a parabolic function n of the target engine speed over time t over the entire slip statedes(ii) a Said parabolic function ndesThe target rotating speed value n of the engine when the control is in a sliding state1Calculate for the vertex.
2. The starting control method of a torque converter according to claim 1, characterized in that the parabolic function n of the target engine speed in the slip statedesCalculated from two points, the vertex of the parabola and the point tangent to the turbine speed, ndesThe functional relationship of (a) is:
3. the starting control method of a torque converter according to claim 1, characterized in that the starting conditions of the starting condition include:
1) whether the opening degree of an accelerator pedal is not lower than a first set threshold value;
2) the turbine speed is not higher than a second set threshold;
3) the current gear is in a starting gear.
The condition that the whole vehicle is in the starting condition can be judged only if the three conditions are simultaneously met.
4. The starting control method of a torque converter according to any one of claims 1 to 3, wherein the determination of the turbine rotational speed change rate in the slip state is made with respect to the turbine rotational speed change rate g locked at the time of immediately entering the slip state controltuIs greater than a third set threshold, and if so, a parabolic function n of the engine target speeddesOutputting after carrying out secondary correction based on the change rate of the turbine speed, if not, still according to the parabolic function n of the target engine speeddesAnd outputting the data.
5. The starting control method of the hydraulic torque converter according to any one of claims 1 to 3, characterized by further comprising, during the starting control of the hydraulic torque converter:
in the release state, the speed ratio of the hydraulic torque converter is judged to be larger than a set threshold value and is kept for a certain time, if yes, the hydraulic torque converter is judged to enter a sliding friction state, and a parabolic function n of the target rotating speed of the engine is calculated and outputdesIf not, the hydraulic torque converter is still in a release state;
in a sliding state, judging that the difference between the rotating speed of the engine and the rotating speed of the turbine is smaller than a set threshold value and keeping for a certain time, if so, controlling the hydraulic torque converter to enter a closed state, and directly assigning the target rotating speed of the engine by the rotating speed of the turbine; if not, the hydraulic torque converter is still in the slip state control.
6. The starting control method of a torque converter according to claim 5, characterized in that the released-state engine target rotational speed is set based on an accelerator opening degree while being corrected by an environmental condition factor.
7. A starting control device for a torque converter, comprising:
at least one processor; and at least one memory communicatively coupled to the processor, wherein:
the memory stores program instructions executable by the processor, the processor calling the program instructions to be able to execute a take-off control method of a torque converter according to any one of claims 1 to 6.
8. A non-transitory computer-readable storage medium storing computer instructions for causing a computer to execute the starting control method of a torque converter according to any one of claims 1 to 6.
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| CN202110863625.0A CN113503351B (en) | 2021-07-29 | 2021-07-29 | Starting control method of hydraulic torque converter |
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Cited By (1)
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| CN114607507A (en) * | 2022-03-11 | 2022-06-10 | 中国第一汽车股份有限公司 | Engine rotating speed detection method and device, computer equipment and medium |
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Effective date of registration: 20240104 Address after: 646003 Section 4, Jiugu Avenue, High tech Zone, Luzhou City, Sichuan Province Patentee after: Luzhou Rongda Intelligent Transmission Co.,Ltd. Address before: 412000 No. 68, durong Road, Yuelu District, Changsha City, Hunan Province Patentee before: Hunan Yung Da intelligent transmission Limited by Share Ltd. Patentee before: Luzhou Rongda Intelligent Transmission Co.,Ltd. |