CN105465352A - Automatic gearbox system and automatic starting and stopping control method of automatic gearbox - Google Patents
Automatic gearbox system and automatic starting and stopping control method of automatic gearbox Download PDFInfo
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- CN105465352A CN105465352A CN201511030098.6A CN201511030098A CN105465352A CN 105465352 A CN105465352 A CN 105465352A CN 201511030098 A CN201511030098 A CN 201511030098A CN 105465352 A CN105465352 A CN 105465352A
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- electric pump
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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
- F16H61/0003—Arrangement or mounting of elements of the control apparatus, e.g. valve assemblies or snapfittings of valves; Arrangements of the control unit on or in the transmission gearbox
- F16H61/0009—Hydraulic control units for transmission control, e.g. assembly of valve plates or valve units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/10—Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/30—Conjoint control of vehicle sub-units of different type or different function including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
- B60W2510/0638—Engine speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
- B60W2510/0676—Engine temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/10—Change speed gearings
- B60W2510/107—Temperature
-
- 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
- F16H2061/0015—Transmission control for optimising fuel consumptions
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Transmission Device (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Abstract
The invention relates to the technical field of gearboxes and provides an automatic gearbox system and an automatic starting and stopping control method of an automatic gearbox. The automatic gearbox system comprises a hydraulic automatic gearbox hydraulic mechanical system and a gearbox control unit. The hydraulic automatic gearbox hydraulic mechanical system comprises a valve plate, a gear shifting clutch and a mechanical pump. The gear shifting clutch and the mechanical pump are connected with the valve plate. The valve plate is electrically connected with the gearbox control unit. The automatic gearbox system further comprises an electric pump connected with the mechanical pump in parallel. The electric pump is connected with the valve plate and is connected with an electric pump controller. The electric pump controller is connected with the gearbox control unit to achieve the function of starting and stopping a vehicle. The minimum system pressure needed by the hydraulic automatic gearbox hydraulic mechanical system in the vehicle starting and stopping stage is met, pressure needed in combination of a transmission chain in the engine starting process is provided at the same time, it is ensured that the hydraulic automatic gearbox hydraulic mechanical system is connected with the transmission chain rapidly and stably and outputs power, and the responding time from igniting to starting of the vehicle is shortened.
Description
Technical field
The invention belongs to transmission technology field, particularly relate to a kind of Transmission System and automatic transmission automatic start-stop controlling method.
Background technique
Time starting-shutdown system (abbreviation start stop system) temporary parking in automatic transmission vehicle travel process (such as waiting red light), motor auto extinguishing, when needs move on, the set of system of system autoboot motor.Its concrete principle is: as long as directly step on brake petal in traveling, vehicle stop completely general two second rear engine will auto extinguishing, step on brake petal, motor will keep cutting out always.As long as a releasing of brake, or steering wheel rotation, motor again can at once automatic ignition, and starting of can stepping on the gas again immediately, whole process is all in D shelves state.This start stop system can reduce the fuel consume stopped in (waiting red light) process under crowded city operating mode greatly, avoids active flameout in driver's docking process and the complex operation that brings.
Start stop system not only needs to control motor can according to the intention auto extinguishing of driver and startup, also needing to control automatic transmission can coordinate motor to open Transmitted chains to reduce the load of engine starting process, couple drive chain carrys out the power of output engine simultaneously, but, current start stop system is while saving fuel consume, and the engine start effect that continues is more weak, and speed of response is slower, engine power promotes comparatively slow, and the startup starting affecting user is experienced.
Summary of the invention
The object of the present invention is to provide a kind of Transmission System, to be intended to solve in prior art start stop system while saving fuel consume, the engine start effect that continues is more weak, and speed of response is slower, engine power promotes comparatively slow, the problem that the startup starting affecting user is experienced.
The present invention realizes like this, a kind of Transmission System, comprise hydraulic automatic speed variator machinery hydraulic system and transmission control unit, described hydraulic automatic speed variator machinery hydraulic system comprises valve plate, shift clutch and mechanical pump, described shift clutch and mechanical pump are connected with described valve plate respectively, described valve plate is electrically connected with described transmission control unit, described Transmission System also comprises the electric pump be arranged in parallel with described mechanical pump, described electric pump is connected with described valve plate, described electric pump is electrically connected with electric pump controller, described electric pump controller is connected with described transmission control unit.
As a kind of improved plan, described electric pump is arranged on the outside of described automatic transmission, and described electric pump controller is connected by CAN with between described transmission control unit.
Another object of the present invention is to provide a kind of automatic transmission automatic start-stop controlling method based on Transmission System, described method comprises the steps:
Control unit of engine is monitored the speed of a motor vehicle, brake signal, engine water temperature and gear signal, judges whether the initial conditions meeting the unlatching of start and stop function;
When meeting the initial conditions that start and stop function is opened, described control unit of engine sends start and stop work request to transmission control unit and opens Transmitted chains request;
Described transmission control unit judges whether the necessary condition meeting the unlatching of start and stop function;
When meeting the necessary condition that start and stop function is opened, described transmission control unit controls to open Transmitted chains, is ready to complete mark to described control unit of engine transmission Transmitted chains Status Flag and start and stop simultaneously;
Described control unit of engine controls motor and performs quenching operations, and judges whether engine speed is less than the first threshold engine speed pre-set;
When engine speed is less than the first threshold engine speed pre-set, described control unit of engine sends engine speed instruction by described transmission control unit to electric pump controller, and described electric pump controller controls the minimum oil pressure state of electric pump running maintenance required for described hydraulic automatic speed variator machinery hydraulic system.
As a kind of improved plan, described transmission control unit judges whether that the step meeting the necessary condition that start and stop function is opened specifically comprises the steps:
Whether described transmission control unit is in shift process to current shift clutch judges;
When described current shift clutch is not in shift process, described transmission control unit judges whether described electric pump exists fault;
When described electric pump does not have fault, described transmission control unit judges the oil temperature in described hydraulic automatic speed variator machinery hydraulic system, judges whether the oil temperature in described hydraulic automatic speed variator machinery hydraulic system is in normal range (NR);
When the oil temperature in described hydraulic automatic speed variator machinery hydraulic system is in normal range (NR), whether described transmission control unit exists fault message to described hydraulic automatic speed variator machinery hydraulic system judges;
If described hydraulic automatic speed variator machinery hydraulic system not fault message, then judge that Current vehicle meets the necessary condition of start and stop function unlatching.
As a kind of improved plan, the initial conditions that described start and stop function is opened comprises whether the speed of a motor vehicle equals 0, brake signal be whether true, engine water temperature whether at normal range (NR) and gear whether at D shelves.
Another object of the present invention is to the automatic transmission automatic start-stop controlling method providing a kind of Transmission System, it is characterized in that, described method comprises the steps:
The severity of braking signal of Current vehicle is monitored, judges whether the severity of braking of Current vehicle is less than the severity of braking calibration value preset;
When the severity of braking of Current vehicle is less than the severity of braking calibration value preset, control unit of engine controls motor and performs ignition operation, and meanwhile, transmission control unit sends rotating speed to electric pump controller increases instruction;
Described electric pump controller increases instruction according to described rotating speed, controls electric pump to hydraulic automatic speed variator machinery hydraulic system replenishment system oil pressure;
Described transmission control unit judges whether the condition meeting Transmitted chains joint;
When meeting the condition that Transmitted chains engages, described transmission control unit controls couple drive chain;
Described transmission control unit sends the status information of Transmitted chains combination to control unit of engine.
As a kind of improved plan, described transmission control unit judges whether that the step meeting the condition that Transmitted chains engages specifically comprises the steps:
Described transmission control unit judges whether motor enters working state;
When described motor enters working state, judge whether engine speed is greater than and pre-set motor second rotary speed threshold value;
When engine speed be greater than pre-set motor the second rotary speed threshold value time, judge current meet Transmitted chains engage condition.
Another object of the present invention is to the method for controlling number of revolution providing a kind of electric pump controller based on Transmission System, described method comprises the steps:
When engine speed drops to the first electric pump reference rotation velocity value, control electric pump controller and start working, promote the rotating speed of described electric pump controller to the start and stop stage rotating speed keeping hydraulic automatic speed variator machinery hydraulic system to be in minimum system pressure;
In the vehicle start and stop stage, described electric pump controller controlling run is on described start and stop stage rotating speed;
When the ascent stage of engine speed by 0, described electric pump controller improves the rotating speed of electric pump to the second electric pump reference rotation velocity value preset;
When engine speed arrives described second electric pump reference rotation velocity value, electric pump controller controls electric pump and quits work.
As a kind of improved plan, described method also comprises the steps:
According to engine speed n
eng, accelerator open degree α and automatic transmission oil temperature T
oil, calculate start and stop stage rotating speed n
eOP, wherein:
n
EOP＝f
1(n
Eng,α)*f
2(n
Eng,T
Oil)；
F
1(n
eng, α) and for electric pump controller is according to engine speed n
engthe target control rotating speed obtained of tabling look-up is carried out, f with accelerator open degree α
2(n
eng, T
oil) for electric pump controller is according to engine speed n
engwith automatic transmission oil temperature T
oilcarrying out tables look-up obtain to target control rotating speed f
1(n
eng, α) and carry out the penalty coefficient revised.
As a kind of improved plan, described method also comprises the steps:
Pre-set the first electric pump reference rotation velocity value and the second electric pump reference rotation velocity value of motor.
In embodiments of the present invention, Transmission System comprises hydraulic automatic speed variator machinery hydraulic system and transmission control unit, hydraulic automatic speed variator machinery hydraulic system comprises valve plate, shift clutch and mechanical pump, shift clutch is connected with valve plate respectively with mechanical pump, valve plate is electrically connected with described transmission control unit, Transmission System also comprises the electric pump be arranged in parallel with mechanical pump, electric pump is connected with described valve plate, electric pump is electrically connected with electric pump controller, electric pump controller is connected with transmission control unit, realize the start and stop function of vehicle, meet while the minimum system pressure required for vehicle start and stop stage hydraulic automatic speed variator machinery hydraulic system, required pressure is combined for providing Transmitted chains in engine starting process, ensure the couple drive chain of hydraulic automatic speed variator machinery hydraulic system quick and stable and outputting power, improve the response time of vehicle ignition to starting.
Accompanying drawing explanation
Fig. 1 is the structural representation of the Transmission System that the embodiment of the present invention provides;
Fig. 2 is the realization flow figure of the automatic transmission automatic start-stop controlling method (unlatching of Transmission System start and stop function) that the embodiment of the present invention provides;
Fig. 3 is the specific implementation flow chart that transmission control unit that the embodiment of the present invention provides judges whether to meet the necessary condition that start and stop function is opened;
Fig. 4 is the realization flow figure of the automatic transmission automatic start-stop controlling method (closedown of Transmission System start and stop function) that the embodiment of the present invention provides;
Fig. 5 is the specific implementation flow chart that transmission control unit that the embodiment of the present invention provides judges whether the step meeting the condition that Transmitted chains engages;
Fig. 6 is the realization flow figure of the method for controlling number of revolution of the electric pump controller that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technological scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 1 shows the structural representation of Transmission System provided by the invention, for convenience of explanation, only gives part related to the present invention in figure.
Transmission System comprises hydraulic automatic speed variator machinery hydraulic system 1 and transmission control unit 2, this hydraulic automatic speed variator machinery hydraulic system 1 comprises valve plate 3, shift clutch 4 and mechanical pump 6, shift clutch 4 is connected with valve plate 3 respectively with mechanical pump 6, valve plate 3 is electrically connected with transmission control unit 2, Transmission System also comprises the electric pump 7 be arranged in parallel with mechanical pump 6, electric pump 7 is connected with valve plate 3, electric pump 7 is electrically connected with electric pump controller 8, and electric pump controller 8 is connected with transmission control unit 2.
Certainly, Transmission System as shown in Figure 1 also comprises other composition structures, does not repeat them here.
Wherein, this Transmission System adopts double pump structure, i.e. the structure of mechanical pump 6 and electric pump 7 parallel connection, this electric pump 7 can be arranged on the hull outside of automatic transmission, is connected between electric pump controller 8 with transmission control unit 2 by CAN.
After engine misses, mechanical pump 6 fuel cut-off be connected with engine output shaft, automatic transmission fluid (lubricant oil) in housing oil duct 9 in hydraulic automatic speed variator machinery hydraulic system 1 and the piston cavity of shift clutch 4 will due to gravity away from being back in hydraulic automatic speed variator machinery hydraulic system 1 oil sump 10, the system oil pressure of hydraulic automatic speed variator machinery hydraulic system 1 becomes 0; When motor is lighted a fire again, first will fill the piston cavity of housing oil duct 9 and shift clutch 4, could control couple drive chain and complete transmission of power, whole Transmitted chains engaging time increases, and the effect that continues is poor; And the design of above-mentioned electric pump 7 and electric pump controller 8, solve this problem, it is specially:
In the hull outside of hydraulic automatic speed variator machinery hydraulic system 1, an electric pump 7 is set, this electric pump 7 is connected in parallel on the oil circuit of original mechanical pump 6, namely oil line pipe one end of electric pump 7 is communicated with oil sump 10, the other end is communicated with valve plate 3, and the work of this electric pump 7 is controlled by electric pump controller 8 (EOP);
When engine speed is lower than the first electric pump reference rotation velocity value preset, electric pump controller 8 controls electric pump 7 and supplements automatic transmission fluid to hydraulic automatic speed variator machinery hydraulic system, the system oil pressure of hydraulic automatic speed variator machinery hydraulic system 1 is made to remain in minimum system pressure range, wherein namely this minimum system pressure required for hydraulic automatic speed variator machinery hydraulic system 1 keep shift clutch 4 to be in the pressure state at bonding point, when can couple drive chain fast after driver's take-off the brake;
When motor is lighted a fire again, mechanical pump 6 is while for hydraulic automatic speed variator machinery hydraulic system 1 fuel feeding, electric pump controller 8 also promotes fuel feeding rotating speed, electric pump 7 continues at a high speed to hydraulic automatic speed variator machinery hydraulic system 1 fuel feeding, Transmitted chains is engaged fast, complete transmission of power, eliminate the process that mechanical pump 6 fills the piston cavity of housing oil duct 9 and shift clutch 4 slowly, improve the response time of the start and stop function of this Transmission System, promote the driving experience of driver, also fuel-efficient, environmental protection simultaneously.
In embodiments of the present invention, as shown in Figure 1, transmission control unit 2 is controlled by the gearshift realizing shift clutch 4 with the electrical connection of valve plate 3, simultaneously, the mode adopting CAN 5 to communicate carries out the control of rotating speed to electric pump controller 8, thus realizes the control that electric pump 7 exports the flow of automatic transmission fluid;
Transmission control unit 2 is connected by CAN 5 with control unit of engine 11, and whether control unit of engine 11 enters the control of motor start and stop according to signal decision-makings such as the speed of a motor vehicle inputted, severity of braking and throttles.
In this embodiment, control unit of engine 11, transmission control unit 2 and electric pump controller 8 are as the core component realizing Transmission System start and stop function, the mode adopting CAN 5 to communicate respectively between control unit of engine 11 with transmission control unit 2, between transmission control unit 2 with electric pump controller 8 carries out content-control, and it is specially:
Communication between control unit of engine 11 and transmission control unit 2 mainly opens the control of closedown and the control of engine misses startup to complete Transmitted chains;
Communication between transmission control unit 2 and electric pump controller 8 is mainly in order to complete the protection of the control to electric pump 7 rotating speed and the formulation of the fault to electric pump 7 related security policies;
Transmission control unit 2 is to the signal that control unit of engine 11 sends gear positions, start and stop Prohibiting Sign, Transmitted chains Status Flag, start and stop are ready to complete mark, and control unit of engine 11 sends engine condition to transmission control unit 2, opens Transmitted chains, the signal of start and stop work request;
Transmission control unit 2 sends the control command of rotary speed parameter and dbjective state to electric pump controller 8, and electric pump controller 8 returns actual speed, voltage failure, current failure, open fault, open circuit fault, the too high fault of temperature of electric pump controller 8 to transmission control unit 2.
Embodiment shown in composition graphs 1, Fig. 2 shows the realization flow figure of the automatic transmission automatic start-stop controlling method (unlatching of Transmission System start and stop function) that the embodiment of the present invention provides, and its concrete step is as follows:
In step S101, control unit of engine is monitored the speed of a motor vehicle, brake signal, engine water temperature and gear signal.
In step s 102, judge whether Transmission System meets the initial conditions of start and stop function unlatching, if then perform step S103, otherwise return continuation execution step S101.
In step s 103, when meeting the initial conditions that start and stop function is opened, control unit of engine sends start and stop work request to transmission control unit and opens Transmitted chains request.
In step S104, transmission control unit judges whether the necessary condition meeting the unlatching of start and stop function, if then perform step S105, otherwise execution returns execution step S103.
In step S105, when meeting the necessary condition that start and stop function is opened, transmission control unit controls to open Transmitted chains, is ready to complete mark to control unit of engine transmission Transmitted chains Status Flag and start and stop simultaneously.
In step s 106, control unit of engine controls motor and performs quenching operations.
In step s 107, judge whether engine speed is less than the first threshold engine speed pre-set, and is perform step S108, otherwise return continuation judgement.
In step S108, when engine speed is less than the first threshold engine speed pre-set, control unit of engine sends engine speed instruction by transmission control unit to electric pump controller, and electric pump controller controls the minimum oil pressure state required for electric pump running maintenance hydraulic automatic speed variator machinery hydraulic system;
Wherein, this first threshold engine speed is the parameter set according to the actual speed of motor, such as 500rpm.
The initial conditions that above-mentioned start and stop function is opened specifically comprises following content: the initial conditions that start and stop function is opened comprises whether the speed of a motor vehicle equals 0, brake signal be whether true, engine water temperature whether at normal range (NR) and gear whether at D shelves;
When above-mentioned condition all meets, represent that the initial conditions that start and stop function starts meets, otherwise do not meet.
In embodiments of the present invention, as shown in Figure 3, transmission control unit judges whether that the step meeting the necessary condition that start and stop function is opened specifically comprises the steps:
In step s 201, whether transmission control unit is in shift process to current shift clutch judges, if then perform step S206, otherwise performs step S202.
In step S202, when current shift clutch is not in shift process, transmission control unit judges whether electric pump exists fault, if then perform step 206, otherwise performs step S203.
In step S203, when electric pump does not have fault, transmission control unit judges the oil temperature in hydraulic automatic speed variator machinery hydraulic system, judges whether the oil temperature in hydraulic automatic speed variator machinery hydraulic system is in normal range (NR), be perform step S204, otherwise perform step S206.
In step S204, when the oil temperature in hydraulic automatic speed variator machinery hydraulic system is in normal range (NR), whether transmission control unit exists fault message to hydraulic automatic speed variator machinery hydraulic system judges, if then perform step S206, otherwise performs step S205.
In step S205, if hydraulic automatic speed variator machinery hydraulic system not fault message, then judge that Current vehicle meets the necessary condition of start and stop function unlatching.
In step S206, transmission control unit needs to send to control unit of engine to forbid start and stop instruction.
As shown in Figures 2 and 3, the request of start and stop mode of operation is judged by control unit of engine, when monitoring that the speed of a motor vehicle equals 0, to be true, speed changer meet in certain scope the initial conditions that start and stop function opens then send start and stop work request to transmission control unit at D (P/N) shelves, engine water temperature service brake signal, and the Transmitted chains of speed changer is opened in request; Transmission control unit is after receiving the instruction of start and stop work request, need to judge shift process, electric pump fault, oil temperature scope, hydraulic automatic speed variator machinery hydraulic system fault, if do not meet initial conditions, transmission control unit needs to send to control unit of engine to forbid start and stop instruction.When meeting initial conditions, namely the Transmitted chains that transmission control unit controls to open speed changer enters neutral position state, then transmission control unit is ready to complete state to control unit of engine transmission Transmitted chains open mode and start and stop, and control unit of engine controls engine misses according to the instruction received; After engine speed is less than 500rpm, mechanical pump will continue to provide oil pressure, so transmission control unit needs to send rotary speed instruction to electric pump controller maintain the minimum oil pressure of system, finally enters start and stop working state.
Embodiment shown in composition graphs 1, Fig. 4 shows the realization flow figure of the automatic transmission automatic start-stop controlling method (closedown of Transmission System start and stop function) that the embodiment of the present invention provides, and its concrete step is as follows:
In step S301, the severity of braking signal of Current vehicle is monitored, judge whether the severity of braking of Current vehicle is less than the severity of braking calibration value preset, if then perform step S302, otherwise perform step S308.
In step s 302, when the severity of braking of Current vehicle is less than the severity of braking calibration value preset, control unit of engine controls motor and performs ignition operation, and meanwhile, transmission control unit sends rotating speed to electric pump controller increases instruction.
In step S303, electric pump controller increases instruction according to rotating speed, controls electric pump to hydraulic automatic speed variator machinery hydraulic system replenishment system oil pressure.
In step s 304, transmission control unit judges whether the condition meeting Transmitted chains joint, is perform step S305, otherwise returns execution step S303.
In step S305, when meeting the condition that Transmitted chains engages, transmission control unit controls couple drive chain.
In step S306, whether, be perform step S307, otherwise return execution step S305 if judging that Transmitted chains engages and completing.
In step S307, transmission control unit sends the status information of Transmitted chains combination to control unit of engine.
In step S308, keep start and stop state.
In this embodiment, as shown in Figure 5, above-mentioned transmission control unit judges whether that the step meeting the condition that Transmitted chains engages specifically comprises the steps:
In step S401, transmission control unit judges whether motor enters working state, is, performs step S402, otherwise performs step S404.
In step S402, when motor enters working state, judging whether engine speed is greater than and pre-set motor second rotary speed threshold value, is perform step S403, otherwise performs step S404.
In step S403, when engine speed be greater than pre-set motor the second rotary speed threshold value time, judge current meet Transmitted chains engage condition.
In step s 404, return execution and control electric pump to the step of hydraulic automatic speed variator machinery hydraulic system replenishment system oil pressure.
Wherein above-mentioned motor second rotary speed threshold value such as, for presetting calibration value, a 600rpm.
In embodiments of the present invention, as shown in Figure 4 and Figure 5, when in driver's releasing of brake process, by detecting the severity of braking signal of brake, the intention of driver is identified in advance.If severity of braking is less than setting value, then need ato unit, couple drive chain moves starting by car, is specially:
First control engine ignition by control unit of engine to start, the rotating speed that transmission control unit controls electric pump controller according to the rotating speed of motor supplements Transmission System flow;
In low engine speed region, the flow system flow that original mechanical pump provides is less, controls the minimum system pressure needed for supplementary engaging clutch by the rotating speed of electric pump controller;
Transmission control unit also needs the working state according to motor (Running) and rotating speed to determine whether couple drive chain, if rotating speed is greater than 600rpm and motor enters Running state, then transmission control unit controls couple drive chain;
After the action of couple drive chain completes, then send the instruction of Transmitted chains closed state to control unit of engine;
Last transmission control unit controls electric pump controller and closes electric pump, completes the closedown of start and stop function.
In embodiments of the present invention, Fig. 6 shows the realization flow figure of the method for controlling number of revolution of the electric pump controller that the embodiment of the present invention provides, and its concrete step is as described below:
In step S501, when engine speed drops to the first electric pump reference rotation velocity value, control electric pump controller and start working, promote the rotating speed of electric pump controller to the start and stop stage rotating speed keeping hydraulic automatic speed variator machinery hydraulic system to be in minimum system pressure.
In step S502, in the vehicle start and stop stage, electric pump controller controlling run is on start and stop stage rotating speed.
In step S503, when the ascent stage of engine speed by 0, electric pump controller improves the rotating speed of electric pump to the second electric pump reference rotation velocity value preset.
In step S504, when engine speed arrives the second electric pump reference rotation velocity value, electric pump controller controls electric pump and quits work.
Wherein, also comprise the steps: in this embodiment
According to engine speed n
eng, accelerator open degree α and automatic transmission oil temperature T
oil, calculate start and stop stage rotating speed n
eOP, wherein:
n
EOP＝f
1(n
Eng,α)*f
2(n
Eng,T
Oil)；
F
1(n
eng, α) and for electric pump controller is according to engine speed n
engthe target control rotating speed obtained of tabling look-up is carried out, f with accelerator open degree α
2(n
eng, T
oil) for electric pump controller is according to engine speed n
engwith automatic transmission oil temperature T
oilcarrying out tables look-up obtain to target control rotating speed f
1(n
eng, α) and carry out the penalty coefficient revised.
Wherein, this engine speed n
engbe the data sheet generated in advance with the correspondence table of accelerator open degree α, its concrete corresponding relation can with reference to following form:
Engine speed n
engwith automatic transmission oil temperature T
oilcorrespondence table be the data sheet generated in advance, its concrete corresponding relation can with reference to following form:
Above-mentioned two forms are the form pre-set according to the situation of reality, do not repeat them here.
In this embodiment, the first electric pump reference rotation velocity value of motor and the second electric pump reference rotation velocity value need to pre-set, to monitor the tachometer value of motor.
In embodiments of the present invention, in Transmission System, mechanical pump and electric pump parallel connection is adopted to provide the mode of Transmission System flow, structure is simple, on the basis of traditional hydraulic automatic speed variator machinery hydraulic system, increase in the outside of hydraulic automatic speed variator machinery hydraulic system housing the requirement that an electric pump can meet start and stop function, avoid the change of speed changer internal structure, cost is low;
Transmission System can realize the start and stop function of car load safely, efficiently, the start and stop function of control unit of engine, control realization car load between transmission control unit and pumping systems is worked in coordination with by CAN signal, reach the object reducing oil consumption, and the intention that can respond driver really controls the opening and closing of start and stop in the best opportunity, can not sacrifice the driving of car load because of engine misses;
The opening and closing controlling method of above-mentioned Transmission System start and stop function, control flow simply can realize anticipation in advance according to severity of braking signal to the joint of Transmitted chains, keep clutch to be in the bonding point pressure of clutch when engine misses, can after driver's take-off the brake engine start couple drive chain fast, allow car load move starting, improve the response characteristic of start and stop function;
The control strategy simple and flexible of electric pump controller, the mode of tabling look-up is adopted to control rotation speed requirements to the electric pump controller meeting different engine region, the adjustment of controling parameters can be realized easily, according to throttle, oil temperature, engine speed carry out controlling meeting the control overflow of likely operating mode.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a Transmission System, comprise hydraulic automatic speed variator machinery hydraulic system and transmission control unit, described hydraulic automatic speed variator machinery hydraulic system comprises valve plate, shift clutch and mechanical pump, described shift clutch and mechanical pump are connected with described valve plate respectively, described valve plate is electrically connected with described transmission control unit, it is characterized in that, described Transmission System also comprises the electric pump be arranged in parallel with described mechanical pump, described electric pump is connected with described valve plate, described electric pump is electrically connected with electric pump controller, described electric pump controller is connected with described transmission control unit.
2. Transmission System according to claim 1, is characterized in that, described electric pump is arranged on the outside of described automatic transmission, and described electric pump controller is connected by CAN with between described transmission control unit.
3., based on an automatic transmission automatic start-stop controlling method for Transmission System according to claim 1, it is characterized in that, described method comprises the steps:
Control unit of engine is monitored the speed of a motor vehicle, brake signal, engine water temperature and gear signal, judges whether the initial conditions meeting the unlatching of start and stop function;
When meeting the initial conditions that start and stop function is opened, described control unit of engine sends start and stop work request to transmission control unit and opens Transmitted chains request;
Described transmission control unit judges whether the necessary condition meeting the unlatching of start and stop function;
When meeting the necessary condition that start and stop function is opened, described transmission control unit controls to open Transmitted chains, is ready to complete mark to described control unit of engine transmission Transmitted chains Status Flag and start and stop simultaneously;
Described control unit of engine controls motor and performs quenching operations, and judges whether engine speed is less than the first threshold engine speed pre-set;
When engine speed is less than the first threshold engine speed pre-set, described control unit of engine sends engine speed instruction by described transmission control unit to electric pump controller, and described electric pump controller controls the minimum oil pressure state of electric pump running maintenance required for described hydraulic automatic speed variator machinery hydraulic system.
4. automatic transmission automatic start-stop controlling method according to claim 3, is characterized in that, described transmission control unit judges whether that the step meeting the necessary condition that start and stop function is opened specifically comprises the steps:
Whether described transmission control unit is in shift process to current shift clutch judges;
When described current shift clutch is not in shift process, described transmission control unit judges whether described electric pump exists fault;
When described electric pump does not have fault, described transmission control unit judges the oil temperature in described hydraulic automatic speed variator machinery hydraulic system, judges whether the oil temperature in described hydraulic automatic speed variator machinery hydraulic system is in normal range (NR);
When the oil temperature in described hydraulic automatic speed variator machinery hydraulic system is in normal range (NR), whether described transmission control unit exists fault message to described hydraulic automatic speed variator machinery hydraulic system judges;
If described hydraulic automatic speed variator machinery hydraulic system not fault message, then judge that Current vehicle meets the necessary condition of start and stop function unlatching.
5. automatic transmission automatic start-stop controlling method according to claim 4, it is characterized in that, the initial conditions that described start and stop function is opened comprises whether the speed of a motor vehicle equals 0, brake signal be whether true, engine water temperature whether at normal range (NR) and gear whether at D shelves.
6., based on an automatic transmission automatic start-stop controlling method for Transmission System according to claim 1, it is characterized in that, described method comprises the steps:
The severity of braking signal of Current vehicle is monitored, judges whether the severity of braking of Current vehicle is less than the severity of braking calibration value preset;
When the severity of braking of Current vehicle is less than the severity of braking calibration value preset, control unit of engine controls motor and performs ignition operation, and meanwhile, transmission control unit sends rotating speed to electric pump controller increases instruction;
Described electric pump controller increases instruction according to described rotating speed, controls electric pump to hydraulic automatic speed variator machinery hydraulic system replenishment system oil pressure;
Described transmission control unit judges whether the condition meeting Transmitted chains joint;
When meeting the condition that Transmitted chains engages, described transmission control unit controls couple drive chain;
Described transmission control unit sends the status information of Transmitted chains combination to control unit of engine.
7. automatic transmission automatic start-stop controlling method according to claim 6, is characterized in that, described transmission control unit judges whether that the step meeting the condition that Transmitted chains engages specifically comprises the steps:
Described transmission control unit judges whether motor enters working state;
When described motor enters working state, judge whether engine speed is greater than and pre-set motor second rotary speed threshold value;
When engine speed be greater than pre-set motor the second rotary speed threshold value time, judge current meet Transmitted chains engage condition.
8. based on a method for controlling number of revolution for the electric pump controller of Transmission System according to claim 1, it is characterized in that, described method comprises the steps:
When engine speed drops to the first electric pump reference rotation velocity value, control electric pump controller and start working, promote the rotating speed of described electric pump controller to the start and stop stage rotating speed keeping hydraulic automatic speed variator machinery hydraulic system to be in minimum system pressure;
In the vehicle start and stop stage, described electric pump controller controlling run is on described start and stop stage rotating speed;
When the ascent stage of engine speed by 0, described electric pump controller improves the rotating speed of described electric pump to the second electric pump reference rotation velocity value preset;
When engine speed arrives described second electric pump reference rotation velocity value, described electric pump controller controls electric pump and quits work.
9. the method for controlling number of revolution of electric pump controller according to claim 8, is characterized in that, described method also comprises the steps:
According to engine speed n
eng, accelerator open degree α and automatic transmission oil temperature T
oil, calculate start and stop stage rotating speed n
eOP, wherein:
n
EOP＝f
1(n
Eng,α)*f
2(n
Eng,T
Oil)；
F
1(n
eng, α) and for electric pump controller is according to engine speed n
engthe target control rotating speed obtained of tabling look-up is carried out, f with accelerator open degree α
2(n
eng, T
oil) for electric pump controller is according to engine speed n
engwith automatic transmission oil temperature T
oilcarrying out tables look-up obtain to target control rotating speed f
1(n
eng, α) and carry out the penalty coefficient revised.
10. the method for controlling number of revolution of electric pump controller according to claim 8 or claim 9, it is characterized in that, described method also comprises the steps:
Pre-set the first electric pump reference rotation velocity value and the second electric pump reference rotation velocity value of motor.
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| WO2020098558A1 (en) * | 2018-11-12 | 2020-05-22 | Ningbo Geely Automobile Research & Development Co., Ltd. | A method for controlling an auto-stop start system of a vehicle |
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