CN102537307A - Automatic neutral-gear returning control method of parking for metal belt type stepless speed changer - Google Patents

Automatic neutral-gear returning control method of parking for metal belt type stepless speed changer Download PDF

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Publication number
CN102537307A
CN102537307A CN2011104470939A CN201110447093A CN102537307A CN 102537307 A CN102537307 A CN 102537307A CN 2011104470939 A CN2011104470939 A CN 2011104470939A CN 201110447093 A CN201110447093 A CN 201110447093A CN 102537307 A CN102537307 A CN 102537307A
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CN
China
Prior art keywords
gear
speed
clutch
stepless speed
neutral
Prior art date
Application number
CN2011104470939A
Other languages
Chinese (zh)
Inventor
马承广
张涌
吴海啸
姜朋昌
段俊强
戴能红
Original Assignee
上海汽车集团股份有限公司
南京汽车集团有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 上海汽车集团股份有限公司, 南京汽车集团有限公司 filed Critical 上海汽车集团股份有限公司
Priority to CN2011104470939A priority Critical patent/CN102537307A/en
Publication of CN102537307A publication Critical patent/CN102537307A/en

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Abstract

The invention discloses an automatic neutral-gear returning control method of parking for a metal belt type stepless speed changer, which comprises the following steps of: (1) judging whether a speed change box is at a driving gear or not, wherein the driving gear is a forwarding gear D or a low-speed gear L; (2) judging whether an accelerator is at an idle-speed position or not; (3) judging whether a brake pedal signal or a parking brake works or not; and (4) judging whether the speed of a vehicle is smaller than the set speed of 3 kilometers per hour or not; when the conditions are simultaneously met, a pulse-width modulation signal is output by a speed change box loaded with a stepless speed changer after 2 seconds through a central processor of an electronic control unit of the stepless speed changer for controlling a control valve of a clutch to modulate the pressure of an oil passage of the clutch, so that the pressure of the clutch is lowered; therefore, the clutch is at a separating state, and the gear is automatically switched into a neutral gear; and when any condition is not met, the speed change box is kept at a current gear, or the operation of switching from the neutral gear to the forwarding gear D is executed. According to the automatic neutral-gear returning control method of parking for the metal belt type stepless speed changer, the gear can be automatically switched into the neutral gear when a vehicle is parked for a longer time at idle speed.

Description

Be used for the metal band type stepless speed variator grade controlling method of making the return trip empty automatically of stopping
Technical field
The present invention relates to a kind of controlling method that is used for metal band type stepless speed variator parking making the return trip empty automatically shelves.
Background technique
Metal band type CVT uses maximum a kind of stepless speed variators at present, and it is a kind of stepless speed variator through the friction transferring power.Metal band type CVT is by the active cone pulley, the driven cone pulley that become the V-type groove, and the V-type driving belt constitutes.Driving and driven cone pulley is composite structure, and an end is fixed, and the other end can move axially.Regulate the axial force (position) of two cone pulleys, the V-type driving belt promptly moves radially between driving and driven cone pulley, and the action radius of driving and driven cone pulley changes, thereby realizes the stepless change of transmission speed ratio.
Metal band type CVT has 5 gears; Be respectively Parking shelves P, reverse gear R, neutral gear N, forward gears D, bottom gear L; The switching of gear is to realize through the position of gear shifting handle control shift valve 8; Referring to Fig. 1, the gear that the ECU of metal band type CVT is selected through gear positions sensor in real time monitoring driver selects the Different control program to cooperate current gear shift control oil hydraulic circuit to accomplish gear switch according to different gears.Wherein the switching of reverse gear R, neutral gear N, forward gears D realizes through the clutch of oil hydraulic circuit control forward clutch and reverse gear brake, and the switching of forward gears D, bottom gear L selects the Different control program to realize through ECU.
The clutch of metal band type CVT is the multi-disc wet clutch, through regulating the unlatching of pwm signal through high-speed switch electromagnetic valve 10 solenoidoperated cluthes control valves 11, on the wet clutch sheet, produces different pressure, thereby reaches the break-make of control transmission of power.The control of starting clutch; Consider oil temperature, throttle opening and unlatching speed, application position and braking speed, engine speed, the speed of a motor vehicle, the gradient, travel of clutch, accelerator pedal position and variance ratio, engine torque characteristics or the like, purpose is to make the combination of clutch quick and steady.
If vehicle just stops relatively short a period of time temporarily, during like the wait red light, the driver steps on brake petal; Rather than change to neutral gear N or Parking shelves P, and this will check the Power Train of CVT by the strong hand, and the moment of rotation of motor is absorbed by torque-converters; Can produce sizable load in the fluid torque converter, this will produce noise and vibration, thereby when stopping; Driving comfortability will reduce, and also makes fuel consume strengthen simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of metal band type stepless speed variator grade controlling method of making the return trip empty automatically of stopping that is used for, this method can automatically switch to neutral gear with gear at the vehicle that loads stepless speed variator when the long period idling is stopped.
The present invention is achieved in that
A kind of metal band type stepless speed variator grade controlling method of making the return trip empty automatically of stopping that is used for the steps include:
(1) judges whether gearbox is in the driving shelves, and driving shelves is forward gears D or bottom gear L;
(2), judge whether throttle is in idle position if automobile gear level is in forward gears D or bottom gear L;
(3), judge whether brake petal signal or parking braking work if throttle is in idle position;
(4) if brake signal or parking braking are worked, judge that whether the speed of a motor vehicle is less than setting speed;
When above-mentioned condition satisfies simultaneously; The gearbox that loads stepless speed variator at 2 seconds later on the central processing unit (CPU) output pulse width modulation signal of the electronic control unit through stepless speed variator through high-speed switch electromagnetic valve solenoidoperated cluthes control valve modulating clutch oil circuit pressure; Make clutch be in separated state thereby make clutch pressure reduce, gear is from moving to neutral gear; Above-mentioned arbitrary condition does not satisfy, and gearbox will keep gear at that time, perhaps carry out the switching from neutral gear to forward gears D.
The setting speed of the said speed of a motor vehicle be 3 kilometers per hour.
The present invention is under existing metal band type CVT and CVT electronic control unit controls; When vehicle meets certain condition; Promptly at the vehicle that loads stepless speed variator when the long period idling is stopped, through controlling method of the present invention, through the central processing unit (CPU) output pulse width modulation signal (PWM) of the electronic control unit of control stepless speed variator through high-speed switch electromagnetic valve solenoidoperated cluthes control valve modulating clutch oil circuit pressure; With clutch separation; Make vehicle be in neutral gear position, thereby improve the performance of vehicle, and can when not satisfying condition, rapidly clutch be combined.
Show through experiment, contain the stepless speed variator car of controlling method of the present invention, the user can obviously feel to shake obviously decline when vehicle stops, and is particularly evident when turn on the aircondition summer.And under the driving situation that frequently starts to walk to stop in the urban district, the automobile that contains this utility function helps the raising of VE Vehicle Economy.And the controlling method of embodiment of the present invention need not to increase special-purpose sensor.
Description of drawings
Fig. 1 is metal band type CVT control system oil circuit control principle figure;
Fig. 2 is used for metal band type stepless speed variator parking making the return trip empty an automatically grade controlling method flow chart for the present invention;
Fig. 3 is the electronic control unit structural representation.
Among the figure: 1 filter, 2 pumps, 3 from kinetic pressure adjusting solenoid valve, 4 oil filters; 5 active pressure modulating valve, 6 one-way valves, 7 straight moving reduction valve, 8 hand shift valves; 9 switch electromagnetic valves, 10 high-speed switch electromagnetic valves, 11 clutch control valves, 12 pilot operated directional control valves; 13 forward clutch oil cylinder oil circuits, 14 reverse clutch oil cylinder oil circuits, 15, lubrication pressure valve.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described further.
Referring to Fig. 2, a kind of metal band type stepless speed variator grade controlling method of making the return trip empty automatically of stopping that is used for, its step be,
(1) judges whether gearbox is in the driving shelves, and driving shelves is forward gears D or bottom gear L;
(2) if automobile gear level is in forward gears D or bottom gear L, judge whether throttle is in idle position, this moment, throttle was shown as idle position 0%;
(3), judge whether brake petal signal or parking braking work if throttle is in idle position;
(4) if brake signal or parking braking are worked, whether judge the speed of a motor vehicle less than a certain setting speed, this setting speed be 3 kilometers per hour;
When above-mentioned condition satisfies simultaneously; The gearbox that loads stepless speed variator at 2 seconds later on the central processing unit (CPU) output pulse width modulation signal (PWM) of the electronic control unit through stepless speed variator through high-speed switch electromagnetic valve solenoidoperated cluthes control valve modulating clutch oil circuit pressure; Thereby making clutch pressure reduce makes clutch be in separated state; Cut off transmission of power, be in similar from moving to neutral state; The accelerator open degree that is vehicle is 0%, and speed of a motor vehicle eigenvalue is 3 kilometers/hour, and gearbox is carried out the action that automatically switches to neutral gear, and the time was 2 seconds.
Above-mentioned arbitrary condition does not satisfy, and gearbox will keep gear at that time, perhaps carry out the switching from neutral gear to forward gears D; Gearbox is from moving to forward gears D; Pulse-width signal this moment (PWM) makes the quick little impact of system pressure reach the required oil pressure value of forward gears D through high-speed switch electromagnetic valve solenoidoperated cluthes control valve modulating clutch oil circuit pressure, thereby switches back normal gear state of a control.
It is under the control of the CVT of vehicle control system that the present invention is used for the stop control action that grade controlling method does that makes the return trip empty automatically of metal band type stepless speed variator; Carry out through a series of electronic parts and components, electronic parts and components comprise: sensor, controller, high-speed switch electromagnetic valve.
Said sensor mainly contains speed probe, pressure transducer, oil temperature sensor, engine sensor etc.Referring to Fig. 3, speed probe is used for handling input shaft rotating speed and output shaft tach signal and sends it controller of CVT to.Said controller mainly refers to the electronic control unit of CVT, and promptly transmission control unit Transmission Control Unit is called for short TCU.Electronic control unit hardware is made up of signal acquisition module, central processing unit (CPU), driver module, CAN Interface Module and serial communication module, and its structure is as shown in Figure 3, and the model of central processing unit (CPU) is TMS320F2812.It is that sensor signal is handled that electronic control unit mainly acts on, and portion is through computing and comparison within it, and the instruction of output control action passes to high-speed switch electromagnetic valve solenoidoperated cluthes control valve with instruction.Collect signals such as driving and driven wheel speed, oil temperature, oil pressure, throttle opening, the speed of a motor vehicle (from auto model), gear through signal acquisition module; Said clutch control valve is also referred to as final controlling element, and the variation that the variation of the electronic signal that sends controller according to flow chart 2 is converted into hydraulic coupling comes control signal is made a response.Wherein GES converts through formula through the secondary speed signal.
Metal band type CVT (stepless speed variator) comprises through the oil circuit of gear servovalve control and when driving shelves, comes the separating and combining clutch through the electromagnetic valve oil pressure; The make the return trip empty automatic operation of shelves of parking is through controlling method of the present invention the combination of the clutch in the stepless speed variator to be made after making judgement with separating.
Forward clutch among the metal band type CVT is made up of the multi-disc wet clutch, and multiplate clutch is realized combining under the effect of hydraulic coupling, is cancelling the automatic separation that relies on return spring realization clutch under the situation of pilot pressure.Hydraulic oil charged into forward clutch control oil cylinder when forward clutch combined, and the forward clutch piston promotes the forward clutch combination under the effect of hydraulic oil.When requiring forward gears D to separate, oil hydraulic circuit directly leaks into fuel tank with the hydraulic oil of forward clutch oil cylinder, and the forward clutch piston makes the piston return automatically under the effect of return spring, realizes the separation of forward clutch.
Hand shift valve 8 work in the oil circuit of CVT in the control of clutch are in neutral gear N position; Referring to Fig. 1; And the forward clutch oil cylinder also is communicated with fuel tank through the forward clutch oil cylinder oil circuit 13 in the hand shift valve 8, and forward clutch is not worked, and is in separated state; Thereby cut off the transmission of power, realize neutral gear.
The reverse clutch oil cylinder oil circuit 14 of the hand shift valve 8 of clutch works in forward gears D, bottom gear L position in the oil circuit of CVT; Referring to Fig. 1; Can find out that the reverse clutch oil cylinder is communicated with fuel tank through the reverse clutch oil cylinder oil circuit 14 of hand shift valve 8; Reverse clutch is not worked, and is in separated state.And forward clutch has pressure oil to infeed, and concrete control oil channel is: fuel tank, and---------------system's principal pressure---directly moves reduction valve 7---high-speed switch electromagnetic valve 10---clutch control valve 11---pilot operated directional control valve 12---hand shift valve 8---forward clutch oil cylinder oil circuit 13---forward clutch oil cylinder to oil pump 2 to filter 1 in oil filter 4 to regulate solenoid valve 3 from kinetic pressure.Straight moving reduction valve 7 provides a stable oil pressure for this loop, although high-speed switch electromagnetic valve 10 adjustable in pressure can't be exported bigger flow, can not directly be used for the control of clutch oil cylinder; And that the spool of clutch control valve 11 can be done is bigger, thereby the bigger flow of output satisfies the Clutch Control oil cylinder and combines fast and the requirement that separates.
When being in, vehicle drives shelves; When being forward gears D, bottom gear L position; Can modulate solenoidoperated cluthes control valves 11 through high-speed switch electromagnetic valve 10 through the central processing unit (CPU) output pwm signal of electronic control unit; Thereby the pressure of solenoidoperated cluthes oil circuit, and then the separation of solenoidoperated cluthes and combination.Parking of the present invention make the return trip empty automatically vehicle that the controlling method of shelves make to load stepless speed variator under certain condition the very first time make stepless speed variator change to neutral gear, otherwise keep gear at that time, perhaps carry out switching from neutral gear N to forward gears D.
More than being merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention, therefore, all any modifications of within spirit of the present invention and principle, being done, is equal to replacement, improvement etc., all just is included within protection scope of the present invention.

Claims (2)

1. one kind is used for the metal band type stepless speed variator grade controlling method of making the return trip empty automatically of stopping, and it is characterized in that:
(1) judges whether gearbox is in the driving shelves, and driving shelves is forward gears D or bottom gear L;
(2), judge whether throttle is in idle position if automobile gear level is in forward gears D or bottom gear L;
(3), judge whether brake petal signal or parking braking work if throttle is in idle position;
(4) if brake signal or parking braking are worked, judge that whether the speed of a motor vehicle is less than setting speed;
When above-mentioned condition satisfies simultaneously; The gearbox that loads stepless speed variator at 2 seconds later on the central processing unit (CPU) output pulse width modulation signal of the electronic control unit through stepless speed variator through high-speed switch electromagnetic valve solenoidoperated cluthes control valve modulating clutch oil circuit pressure; Make clutch be in separated state thereby make clutch pressure reduce, gear is from moving to neutral gear; Above-mentioned arbitrary condition does not satisfy, and gearbox will keep gear at that time, perhaps carry out the switching from neutral gear to forward gears D.
2. the metal band type stepless speed variator grade controlling method of making the return trip empty automatically of stopping that is used for according to claim 1 is characterized in that: the setting speed of the said speed of a motor vehicle be 3 kilometers per hour.
CN2011104470939A 2011-12-28 2011-12-28 Automatic neutral-gear returning control method of parking for metal belt type stepless speed changer CN102537307A (en)

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Application Number Priority Date Filing Date Title
CN2011104470939A CN102537307A (en) 2011-12-28 2011-12-28 Automatic neutral-gear returning control method of parking for metal belt type stepless speed changer

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Cited By (6)

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Publication number Priority date Publication date Assignee Title
CN102563038A (en) * 2011-12-31 2012-07-11 重庆长安汽车股份有限公司 Neutral position control method for automatic transmission
CN102806905A (en) * 2012-07-11 2012-12-05 联合汽车电子有限公司 Idle speed neutral-position control method for automatic transmission
CN104724105A (en) * 2013-12-19 2015-06-24 现代自动车株式会社 Method of controlling parking control device of transmission
CN106195259A (en) * 2016-07-25 2016-12-07 广州汽车集团股份有限公司 A kind of automatic transmission neutral control method
CN106870716A (en) * 2017-03-24 2017-06-20 中国第汽车股份有限公司 A kind of automatic speed changer for machine neutral gear position recognition methods
CN107344553A (en) * 2016-05-06 2017-11-14 宝沃汽车(中国)有限公司 The control method of vehicle, system and there is its vehicle

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CN102563038A (en) * 2011-12-31 2012-07-11 重庆长安汽车股份有限公司 Neutral position control method for automatic transmission
CN102806905A (en) * 2012-07-11 2012-12-05 联合汽车电子有限公司 Idle speed neutral-position control method for automatic transmission
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CN107344553A (en) * 2016-05-06 2017-11-14 宝沃汽车(中国)有限公司 The control method of vehicle, system and there is its vehicle
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CN106195259A (en) * 2016-07-25 2016-12-07 广州汽车集团股份有限公司 A kind of automatic transmission neutral control method
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CN106870716A (en) * 2017-03-24 2017-06-20 中国第汽车股份有限公司 A kind of automatic speed changer for machine neutral gear position recognition methods
CN106870716B (en) * 2017-03-24 2018-09-11 中国第一汽车股份有限公司 A kind of automatic speed changer for machine neutral gear position recognition methods

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