CN111810630A - Control system and control method suitable for hydraulic coupling type transmission - Google Patents
Control system and control method suitable for hydraulic coupling type transmission Download PDFInfo
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- CN111810630A CN111810630A CN202010710742.9A CN202010710742A CN111810630A CN 111810630 A CN111810630 A CN 111810630A CN 202010710742 A CN202010710742 A CN 202010710742A CN 111810630 A CN111810630 A CN 111810630A
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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
- F16H61/38—Control of exclusively fluid gearing
- F16H61/48—Control of exclusively fluid gearing hydrodynamic
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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
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/68—Inputs being a function of gearing status
- F16H59/72—Inputs being a function of gearing status dependent on oil characteristics, e.g. temperature, viscosity
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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
- F16H61/0262—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 hydraulic
- F16H61/0265—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 hydraulic for gearshift control, e.g. control functions for performing shifting or generation of shift signals
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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
- F16H61/04—Smoothing ratio shift
Abstract
The invention provides a control system and a control method suitable for a hydraulic coupling type transmission, which comprise an automatic transmission electronic control system and an automatic transmission hydraulic system; the automatic transmission hydraulic system comprises an oil pump, an oil supply system, a gear shifting system and a hydraulic torque converter locking and cooling management system, and the automatic transmission electronic control system comprises a sensor, a TCU and an electromagnetic valve. The control system and the control strategy of the hydraulic coupling type transmission can realize real-time communication between an engine and the transmission, ensure that the input rotating speed, the torque and the gear of the transmission meet the requirements of vehicle operation, actively adjust the running state of the transmission according to the intention of a driver, and ensure that the automatic transmission can work according to the preset optimal control rule under any working condition, thereby achieving the optimal gear shifting quality and transmission efficiency.
Description
Technical Field
The invention belongs to the technical field of automatic transmissions, and particularly relates to a control system and a control method suitable for a hydraulic coupling type transmission.
Background
At present, domestic automatic transmissions are developing very rapidly. The hydromechanical double-clutch transmission is a novel automatic transmission and consists of a hydraulic torque converter and a double-clutch transmission. The gear shifting of the double-clutch transmission is realized by two clutches through the cooperation of the control of the clutch executing mechanism and the gear shifting executing mechanism, the power interruption-free gear shifting is realized, the transmission principle of the double-clutch transmission is similar to that of an AMT (automated mechanical transmission), the transmission mechanism is mostly mechanical transmission, the gear shifting speed is faster than that of the AMT through the cooperation of the double clutches, and therefore the double-clutch transmission has higher power performance and fuel economy. However, the structure of the dual clutch transmission is complex, the number of control units is large, and if the control strategies are not matched properly, the dual clutch transmission can generate serious pause and frustration in the gear shifting process, even double gears are engaged, and the vehicle cannot run normally. A good control strategy for a dual clutch transmission is therefore particularly important.
Disclosure of Invention
The invention aims to provide a control system and a control method suitable for a hydraulic coupling type transmission so as to achieve optimal gear shifting quality and transmission efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that: a control system suitable for a hydraulic coupling type transmission comprises an automatic transmission electronic control system and an automatic transmission hydraulic system;
the hydraulic system of the automatic transmission comprises an oil pump, an oil supply system, a gear shifting system and a hydraulic torque converter locking and cooling management system, wherein an inlet of the oil supply system is connected to the oil pump, an outlet of the oil supply system is respectively connected to the gear shifting system and the hydraulic torque converter locking and cooling management system, an input end of the gear shifting system is also connected with a gear shifting rod, and an output end of the gear shifting system is connected to a transmission synchronizer through a gear shifting execution mechanism;
the electronic control system of the automatic transmission comprises a sensor, a TCU and an electromagnetic valve, wherein the sensor comprises a vehicle speed sensor and an accelerator opening sensor, the vehicle speed sensor and the accelerator opening sensor are both connected with the input end of the TCU, the electromagnetic valve comprises a main oil way electromagnetic valve, a gear shifting electromagnetic valve and a locking control electromagnetic valve, the input ends of the main oil way electromagnetic valve, the gear shifting electromagnetic valve and the locking control electromagnetic valve are all connected to the output end of the TCU, and the output ends of the main oil way electromagnetic valve, the gear shifting electromagnetic valve and the locking control electromagnetic valve are respectively and correspondingly connected to the control ends of the oil supply system, the gear shifting system and the hydraulic torque converter;
further, a torque converter cooler is connected to the output end of the hydraulic torque converter locking and cooling management system.
Furthermore, torque converter locking and cooling management system includes torque converter locking clutch, turbine speed sensor, pump impeller speed sensor, oil pressure sensor and hydraulic oil temperature sensor, locking clutch, turbine speed sensor, pump impeller speed sensor, oil pressure sensor and hydraulic oil temperature sensor all be connected to TCU's input, torque converter locking clutch is connected to TCU's output, TCU accessible is to the analysis and the processing of each parameter of current vehicle running state and torque converter, the state of active control torque converter locking clutch, reaches optimal fuel economy.
A control method for a control system for a hydrodynamically coupled transmission, comprising the steps of:
s1, judging the current state of the hydraulic torque converter;
s2, if the vehicle is in a locking state, judging whether the vehicle is in a braking state, and if the vehicle is braking, executing unlocking; if the unlocking state is detected, step S3 is executed;
s3, judging the current gear, and if the gear is neutral or is shifting, maintaining the current state;
s4, if the gear is in the gear position, judging the temperature T of the hydraulic oil;
s5, if T is less than 60 ℃, maintaining the current state; if T is greater than 60 ℃, the TCU judges the current rotating speeds of the turbine and the pump impeller through a hydraulic torque converter locking and cooling management system;
and S6, if the current rotating speed nw is greater than the preset rotating speed nb, maintaining the current state, and if nw < nb, executing locking operation.
Compared with the prior art, the invention has the beneficial effects that: the control system and the control strategy of the hydraulic coupling type transmission can realize real-time communication between an engine and the transmission, ensure that the input rotating speed, the torque and the gear of the transmission meet the requirements of vehicle operation, actively adjust the running state of the transmission according to the intention of a driver, and ensure that the automatic transmission can work according to the preset optimal control rule under any working condition, thereby achieving the optimal gear shifting quality and transmission efficiency.
Drawings
FIG. 1 is a functional block diagram of a control system for a hydrodynamically coupled transmission in accordance with the present invention;
fig. 2 is a flow chart illustrating a control method of a control system for a hydrodynamically coupled transmission according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the protection scope of the present invention.
A control system suitable for a hydraulic coupling type transmission comprises an automatic transmission electronic control system and an automatic transmission hydraulic system;
the hydraulic system of the automatic transmission comprises an oil pump, an oil supply system, a gear shifting system and a hydraulic torque converter locking and cooling management system, wherein an inlet of the oil supply system is connected to the oil pump, an outlet of the oil supply system is respectively connected to the gear shifting system and the hydraulic torque converter locking and cooling management system, an input end of the gear shifting system is also connected with a gear shifting rod, and an output end of the gear shifting system is connected to a transmission synchronizer through a gear shifting execution mechanism;
the electronic control system of the automatic transmission comprises a sensor, a TCU and an electromagnetic valve, wherein the sensor comprises a vehicle speed sensor and an accelerator opening sensor, the vehicle speed sensor and the accelerator opening sensor are both connected with the input end of the TCU, the electromagnetic valve comprises a main oil way electromagnetic valve, a gear shifting electromagnetic valve and a locking control electromagnetic valve, the input ends of the main oil way electromagnetic valve, the gear shifting electromagnetic valve and the locking control electromagnetic valve are all connected to the output end of the TCU, and the output ends of the main oil way electromagnetic valve, the gear shifting electromagnetic valve and the locking control electromagnetic valve are respectively and correspondingly connected to the control ends of the oil supply system, the gear shifting system and the hydraulic torque converter;
according to the scheme, the torque converter cooler is connected to the output end of the hydraulic torque converter locking and cooling management system.
The scheme is further optimized, torque converter locking and cooling management system includes torque converter locking clutch, turbine speed sensor, pump impeller speed sensor, oil pressure sensor and hydraulic oil temperature sensor, locking clutch, turbine speed sensor, pump impeller speed sensor, oil pressure sensor and hydraulic oil temperature sensor all be connected to TCU's input, torque converter locking clutch is connected to TCU's output, the TCU accessible is to the analysis and the processing of current vehicle running state and each parameter of torque converter, the state of active control torque converter locking clutch reaches the optimal fuel economy.
A control method for a control system for a hydrodynamically coupled transmission, comprising the steps of:
s1, judging the current state of the hydraulic torque converter;
s2, if the vehicle is in a locking state, judging whether the vehicle is in a braking state, and if the vehicle is braking, executing unlocking; if the unlocking state is detected, step S3 is executed;
s3, judging the current gear, and if the gear is neutral or is shifting, maintaining the current state;
s4, if the gear is in the gear position, judging the temperature T of the hydraulic oil;
s5, if T is less than 60 ℃, maintaining the current state; if T is greater than 60 ℃, the TCU judges the current rotating speeds of the turbine and the pump impeller through a hydraulic torque converter locking and cooling management system;
and S6, if the current rotating speed nw is greater than the preset rotating speed nb, maintaining the current state, and if nw < nb, executing locking operation.
The invention is described in detail below with reference to the accompanying drawings:
as shown in fig. 1, a control system for a hydrodynamically coupled transmission includes an automatic transmission electronic control system and an automatic transmission hydraulic system;
the hydraulic system of the automatic transmission comprises an oil pump, an oil supply system, a gear shifting system and a hydraulic torque converter locking and cooling management system, wherein an inlet of the oil supply system is connected to the oil pump, an outlet of the oil supply system is respectively connected to the gear shifting system and the hydraulic torque converter locking and cooling management system, an input end of the gear shifting system is also connected with a gear shifting rod, and an output end of the gear shifting system is connected to a transmission synchronizer through a gear shifting execution mechanism;
the electronic control system of the automatic transmission comprises a sensor, a TCU and an electromagnetic valve, wherein the sensor comprises a vehicle speed sensor and an accelerator opening sensor, the vehicle speed sensor and the accelerator opening sensor are both connected with the input end of the TCU, the electromagnetic valve comprises a main oil way electromagnetic valve, a gear shifting electromagnetic valve and a locking control electromagnetic valve, the input ends of the main oil way electromagnetic valve, the gear shifting electromagnetic valve and the locking control electromagnetic valve are all connected to the output end of the TCU, and the output ends of the main oil way electromagnetic valve, the gear shifting electromagnetic valve and the locking control electromagnetic valve are respectively and correspondingly connected to the control ends of the oil supply system, the gear shifting system and the hydraulic torque converter;
the hydraulic system of the automatic transmission can meet the hydraulic pressure and the minimum flow required by links such as gear shifting operation, a hydraulic torque converter and lubrication and the like by controlling the oil supply amount of the oil pump, and meanwhile can ensure the corresponding pressure required by the normal work of the hydraulic system.
The gear shifting system has a gear shifting operation function and an emergency guarantee function, the automatic gear shifting function is that a driver triggers a gear shifting valve after operating a manual gear shifting rod, the TCU controls a gear shifting solenoid valve switch through received information and combining the current working condition of a vehicle, and the automatic gear shifting operation is realized through the collection and separation of a clutch and a brake in the oil pressure control gear shifting system.
The emergency guarantee function is used for guaranteeing that when an electronic control system of the vehicle goes wrong or an electromagnetic valve fails, the vehicle still keeps one or two forward gears and a reverse gear, and a driver can enable the vehicle with the failed electronic control system to continue running by manually operating a gear shifting valve.
The hydraulic torque converter locking and cooling management system comprises a torque converter locking clutch, a turbine rotating speed sensor, a pump impeller rotating speed sensor, an oil pressure sensor and a hydraulic oil temperature sensor, and the TCU can actively control the state of the torque converter locking clutch through analyzing and processing the current vehicle running state and various parameters of the hydraulic torque converter, so that the optimal fuel economy is achieved.
The torque converter locking and cooling management system ensures the normal operating temperature of the torque converter. When the temperature of oil in the hydraulic torque converter is too low, the viscosity of the oil is high, the working efficiency of the hydraulic torque converter is low, the control system controls the locking clutch to be forcibly opened, and the oil is stirred in an accelerated manner to increase the temperature; when the temperature of the oil in the hydraulic torque converter is too high, the control system controls the locking clutch to be locked forcibly, the cooling system is involved at the same time, the heat of the oil is taken away in time, and the temperature of the oil is ensured to be always within the temperature range of the maximum working efficiency of the hydraulic torque converter.
The mechanical structure of the hydraulic coupling type transmission mainly comprises a hydraulic torque converter and a double-clutch transmission. The control is also control for both. For a hydraulic torque converter, locking control is mainly performed on the hydraulic torque converter according to signals such as the rotating speed of a vehicle engine, the rotating speed of a turbine, the water temperature, the oil temperature, a gear, braking and the opening degree of an accelerator, and a control process of the hydraulic torque converter is shown in fig. 2 and comprises the following steps:
s1, judging the current state of the hydraulic torque converter;
s2, if the vehicle is in a locking state, judging whether the vehicle is in a braking state, and if the vehicle is braking, executing unlocking; if the unlocking state is detected, step S3 is executed;
s3, judging the current gear, and if the gear is neutral or is shifting, maintaining the current state;
s4, if the gear is in the gear position, judging the temperature T of the hydraulic oil;
s5, if T is less than 60 ℃, maintaining the current state; if T is greater than 60 ℃, the TCU judges the current rotating speeds of the turbine and the pump impeller through a hydraulic torque converter locking and cooling management system;
and S6, if the current rotating speed nw is greater than the preset rotating speed nb in the TCU, maintaining the current state, and if nw is less than nb, executing locking operation.
When the vehicle is in a low-speed gear and a starting stage, the low-speed gear is generally in a traction working condition, the load borne by the vehicle is large at the moment, and in order to enable a vehicle power system to adapt to external load with high strength, a torque converter locking clutch is required to be placed in an unlocking state.
The high-speed gear of the vehicle is generally a running working condition, when the vehicle is in a running gear, the load borne by the vehicle is not too large, and after the vehicle enters a stable running state after gear shifting is completed, the hydraulic torque converter is locked, so that the fuel economy and the mechanical transmission efficiency can be improved.
When the temperature of hydraulic oil of the torque converter is lower than 60 ℃, the viscosity of the hydraulic oil is high, the efficiency of the torque converter is low, the locking clutch of the hydraulic torque converter is in a forced unlocking state, the torque converter is used for stirring the hydraulic oil, the hydraulic oil is enabled to reach the proper temperature quickly, and the working performance of the hydraulic torque converter is guaranteed.
During braking operation, the engine will generate a back-dragging torque to the driving wheel through the transmission, which affects the braking effect, and when the gear is not matched with the vehicle speed, for example: when the gear is too high and the vehicle speed is too low, the vehicle engine is suppressed to be flamed out. Therefore, in the case of a braking operation, the lock-up clutch should be in the unlocked state.
The shift conditions include both upshifts and downshifts. During the gear shifting process, impact is generated in the process of either gear shifting operation or gear shifting operation, and at the moment, the locking clutch of the hydraulic torque converter is in an unlocking state, so that the effect of absorbing the impact by the hydraulic torque converter is fully exerted.
The double-clutch transmission consists of an electronic control system and various actuating mechanisms. The electric control system mainly comprises a rotating speed sensor, an oil temperature sensor, an electromagnetic valve, a TCU and a wire harness. The actuating mechanism comprises a gear shifting actuating mechanism and a clutch actuating mechanism. The TCU has the function of ensuring the balance of the relation between the sliding friction work and the impact degree when the double clutches are in gear shifting operation, thereby prolonging the service life of the friction plate of the clutch and improving the fuel economy.
Although the engine speed is consistent with the speed of a shaft of the transmission in the double-clutch gear shifting process, the engine torque has positive and negative values, so the gear shifting process is divided into the following four conditions according to the positive and negative values of the engine speed: power upshifts, unpowered upshifts, power downshifts, and unpowered downshifts.
In the power upshift process, the vehicle is in an acceleration state, the opening degree of an accelerator is not 0, for example, when the first gear is shifted up to the second gear, the pressure of a working cylinder of a clutch c1 is reduced, the working cylinder of a clutch c2 starts to be filled with oil, and in the upshift process, a locking clutch of a hydraulic torque converter is unlocked to absorb impact generated by double clutch switching in the gear shifting process. The transmission gear ratio is reduced and the engine speed is appropriately reduced so that the engine speed coincides with the transmission target speed. With the increasing torque transmitted by the clutch c2, the engine torque is appropriately reduced to reduce the friction of the friction plate of the clutch, shorten the gear shifting time and improve the gear shifting quality.
Under the unpowered upshift process, the vehicle slides to accelerate the upshift, and the opening degree of the accelerator is the minimum. Taking a fifth gear up-shift and a sixth gear as an example, the pressure of the working cylinder of the clutch c1 is reduced, the working cylinder of the clutch c2 starts to be filled with oil, the torque of the engine is a resisting torque at the moment, the locking clutch is unlocked during the gear up-shift, the transmission gear ratio is reduced, the rotating speed of the engine is increased, the torque transmitted by the clutch c2 is increased, and the torque of the engine is increased.
In the power downshift process, the opening degree of an accelerator is large, and the vehicle is in an acceleration and torque increasing state. Taking the second gear down and the first gear as an example, the pressure of the working cylinder of the clutch c2 is reduced, the working cylinder of the clutch c1 starts to charge oil, the situation is the same as the situation of unpowered gear up, the moment of the engine is still the resisting moment, the transmission ratio is increased, the rotating speed of the engine is increased, and the load of the engine is reduced.
And in the unpowered downshifting process, the accelerator opening is minimum, and the vehicle decelerates, slides and downshifts. At the moment, the clutch acts on the resisting moment on the vehicle, the transmission ratio is increased, namely the rotating speed of a driving disk of the combined clutch in the target gear is higher than that of a driving disk of the separated clutch in the current gear, the TCU needs to accelerate the engine first, the rotating speed difference between the engine and the clutch in the target gear is reduced, and the gear shifting impact is reduced.
The hydraulic torque converter consists of a pump impeller and a turbine, and realizes the interconversion of mechanical energy and hydraulic energy by utilizing the interaction of blades of the pump impeller and the turbine and hydraulic transmission oil, thereby achieving the purpose of changing transmission torque. The torque converter can achieve continuous change of speed and torque, and can absorb shock during driving and gear shifting. The matching of the hydraulic torque converter and the double-clutch transmission can ensure that the gear shifting process is smoother and the driving is more comfortable; meanwhile, the hydraulic coupling type transmission has the advantages of smooth gear shifting, simplicity in operation, high transmission efficiency, good fuel economy, good driving comfort and the like.
The control system and the control strategy of the hydraulic coupling type transmission can realize real-time communication between the engine and the transmission, ensure that the input rotating speed, the torque and the gear of the transmission of the engine meet the requirements required by vehicle operation, and simultaneously, actively adjust the running state of the transmission according to the will of a driver, ensure that the automatic transmission can work according to the preset optimal control rule under any working condition, and achieve the optimal gear shifting quality and transmission efficiency.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. A control system adapted for use in a hydrodynamically coupled transmission, comprising: the automatic transmission hydraulic system comprises an automatic transmission electronic control system and an automatic transmission hydraulic system;
the hydraulic system of the automatic transmission comprises an oil pump, an oil supply system, a gear shifting system and a hydraulic torque converter locking and cooling management system, wherein an inlet of the oil supply system is connected to the oil pump, an outlet of the oil supply system is respectively connected to the gear shifting system and the hydraulic torque converter locking and cooling management system, an input end of the gear shifting system is also connected with a gear shifting rod, and an output end of the gear shifting system is connected to a transmission synchronizer through a gear shifting execution mechanism;
the electronic control system of the automatic transmission comprises a sensor, a TCU and an electromagnetic valve, wherein the sensor comprises a vehicle speed sensor and an accelerator opening sensor, the vehicle speed sensor and the accelerator opening sensor are connected with the input end of the TCU, the electromagnetic valve comprises a main oil way electromagnetic valve, a gear shifting electromagnetic valve and a locking control electromagnetic valve, the input ends of the main oil way electromagnetic valve, the gear shifting electromagnetic valve and the locking control electromagnetic valve are connected to the output end of the TCU, and the output ends of the main oil way electromagnetic valve, the gear shifting electromagnetic valve and the locking control electromagnetic valve are respectively and correspondingly connected to the control ends of the oil supply system, the gear shifting system, the hydraulic torque converter locking and.
2. A control system for a hydrodynamically coupled transmission as defined in claim 1, wherein: and the output end of the hydraulic torque converter locking and cooling management system is connected with a torque converter cooler.
3. A control system for a hydrodynamically coupled transmission as defined in claim 2, wherein: torque converter locking and cooling management system include torque converter locking clutch, turbine speed sensor, impeller speed sensor, oil pressure sensor and hydraulic oil temperature sensor, locking clutch, turbine speed sensor, impeller speed sensor, oil pressure sensor and hydraulic oil temperature sensor all be connected to TCU's input, torque converter locking clutch is connected to TCU's output, the TCU accessible is to the analysis and the processing of each parameter of current vehicle running state and torque converter, the state of active control torque converter locking clutch reaches the optimal fuel economy.
4. A control method of a control system for a hydrodynamically coupled transmission as defined in any one of claims 1 to 3, comprising the steps of:
s1, judging the current state of the hydraulic torque converter;
s2, if the vehicle is in a locking state, judging whether the vehicle is in a braking state, and if the vehicle is braking, executing unlocking; if the unlocking state is detected, step S3 is executed;
s3, judging the current gear, and if the gear is neutral or is shifting, maintaining the current state;
s4, if the gear is in the gear position, judging the temperature T of the hydraulic oil;
s5, if T is less than 60 ℃, maintaining the current state; if T is greater than 60 ℃, the TCU judges the current rotating speeds of the turbine and the pump impeller through a hydraulic torque converter locking and cooling management system;
and S6, if the current rotating speed nw is greater than the preset rotating speed nb, maintaining the current state, and if nw < nb, executing locking operation.
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| CN202010710742.9A CN111810630A (en) | 2020-07-22 | 2020-07-22 | Control system and control method suitable for hydraulic coupling type transmission |
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| CN113790251A (en) * | 2021-09-02 | 2021-12-14 | 浙江大学 | Vehicle power system, optimization method and control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113790251A (en) * | 2021-09-02 | 2021-12-14 | 浙江大学 | Vehicle power system, optimization method and control method |
| CN113790251B (en) * | 2021-09-02 | 2024-02-06 | 浙江大学 | Vehicle power system, optimization method and control method |
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