CN1007226B - Automatic transinission control - Google Patents
Automatic transinission controlInfo
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- CN1007226B CN1007226B CN 85107497 CN85107497A CN1007226B CN 1007226 B CN1007226 B CN 1007226B CN 85107497 CN85107497 CN 85107497 CN 85107497 A CN85107497 A CN 85107497A CN 1007226 B CN1007226 B CN 1007226B
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Abstract
The present invention relates to an improved control system for an automatic gear shifting speed variator (10) which is driven by an engine (12) controlled by a throttle (18). The control system comprises a central processing unit (30) which is used for receiving input signals, and the input signals at least can denote the position of the throttle (18), an engine speed (20) and a vehicle speed (28). The central processing unit is also used for processing the input signals according to a program to determine the transmission ratio of meshing engagement and sends command signals to a controller (26) of the speed variator. The central processing unit comprises a drive selection device manipulator used for selecting operating modes (D1 or DL), in the operating modes, the performance of a vehicle can be optimal, and the controller determines the permissible number of leaping downward shifts and performs shifts.
Description
The invention relates to automotive drive system with a plurality of gear reduction ratios, for example, automated mechanical transmission, with and control system.The present invention is particularly about having the vehicle control system with engine throttle control and automatic transmission with hydraulic torque converter, this system is according to measuring and/or parameters calculated, for example: the speed of output shaft or vehicle, input shaft or engine speed, throttle position, the calculation engine speed in a possible transmitting ratio etc., make and carry out gear selection and gear shift decision.More particularly, the invention relates to the automatic transmission control system of the above-mentioned type, it has a kind of selectable operation scheme, can change downwards greater than 1 class under the permission situation.
With regard to prior art, adopt the automation type of non-friction (rigidity) power-transfer clutch and the planetary gear type of employing friction clutch, this automatic transmission with hydraulic torque converter of two types has been on record, also is that present control system adopts.The electronic control system that is used for automatic transmission with hydraulic torque converter, wherein gears select and gear shift determine be measure according to some and/or calculate parameter make, these parameters have: car speed, engine speed, vehicle speed variation rate, the engine speed rate of change, throttle position, throttle position rate of change, throttle high-fall (being gear down), stop mechanism braking, instant transmitting ratio etc. are all known in the prior art.The example that is used for the automatic gear shifting control system of vehicle like this can be consulted US Patent №, and 4,361,060,4,073,203,4,253,348,4,038,889,4,226,295,3,776,048,4,208,929,4,039,061,3,974,720 and 3,942,393, it is all only for reference that introduce here.
Yet, above-cited automatic transmission control system and similar system, by selecting a desirable transmission recently to control automatic transmission with hydraulic torque converter is actv., in view of detected parameter, order is suspended on the gear of selected transmitting ratio then, and this transmitting ratio makes its fuel-economizing and/or vehicle performance be tending towards best.When produce one or more shift patterns (being also referred to as gear point distribution graph usually) with preset program, this control system can not be entirely satisfactory.Because this preset program (as the cross-country situation that usually runs into) driver when vehicle is climbed can not regulate, to select the operation scheme of a vehicle optimum performance, particularly, autotruck runs into its big inertia of the bigger slope of gradient (for example greater than 20% gradient) will be caused vehicle to slow down rapidly and produce repeatedly gear shift downwards step by step fast, and this may be unfavorable and cause vehicle further to slow down and/or because at the gear shift idle period of moment, the under power that is provided to vehicle by driving engine and cause engine off.
According to the present invention, can be by being automatic transmission with hydraulic torque converter, for example, automated mechanical transmission provides a control system, preferably electronic control system comes the shortcoming in the prior art is overcome and limits, the selection of class and gear shift time decision and operation all are to make according to the measurement and/or the calculating of some parameters in this automatic shift device, these parameters comprise instant input shaft or engine speed, throttle position, output shaft or car speed and for the calculation engine speed of instant car speed with expect engageable than the underneath drive ratio.And the preset program of the order that wherein can change, have a selectable mode of driver, if in this mode, allow, can carry out the deceleration (for example, jump level slow down) of an above transmitting ratio.
By a change control system is provided, said process is done, this control system comprises a central process unit, it produces shift pattern according to engine speed that detects or calculate and throttle position, and, wherein preferably order the gear shifting position diagram of raising speed gear shift to obtain revising by increasing engine speed.This control system has the selection handling device of selection operation scheme (usually when cross-country), wherein, when running into slope or analogue, control setup will automatically calculate, the starting and finish the reduction of speed gear shift that can allow greater than one grade, improve the performance of vehicle.In this operation scheme, when reaching an engine speed that shows the reduction of speed gear shift, control setup will calculate under vehicle/output shaft speed at that time N than underneath drive than the anticipated engine speed in following time (N is the integer greater than 1 here, normally 2 or 3).If the predicted value that calculates does not surpass maximum permissible value (this value is best relevant with the speed when engine breakdown occurs), then order to N low gear shift.More preferably, hang N than low grade before, calculate N lower anticipated engine speed once more and have only when working as the speed of being calculated and being no more than speed from N more low-grade raising speed gear shift according to vehicle/output shaft speed at that time, order is to N low gear shift.
Therefore, in selectable mode, have only when engine demolition can not occur, control setup is the starting grade gear shift that jumps, certainly, the raising speed immediately not unless vehicle is fully slowing down, the level that preferably do not jump is slowed down.
Level is not slowed down if do not allow to jump, and shift down is step by step carried out in order.
Therefore, the purpose of this invention is to provide a kind of new improved automatic gear shifting control system, it will judge the operation scheme of driver's selection, and wherein the performance of vehicle will fully be improved, and grade deceleration shifting that jumps that order is allowed.
Other purposes of the present invention and advantage will become perfectly clear by the description to the most preferred embodiment that has accompanying drawing.
Fig. 1 is the internal connection of automation change control system of the present invention and the scheme drawing of assembly.
Fig. 2 is the relation curve of engine speed and throttle position, and it shows shift pattern or each grade some distribution graph that is produced by control system of the present invention.
Fig. 3 is a table, the ratio of typical automated mechanical transmission of its expression drive shaft speed and output shaft speed under various transmitting ratios.
Fig. 1 schematically shows an automatic how fast pick-off gear change-speed box 10, this change-speed box is by master friction clutch 14, by an engine throttle control 12, for example known combustion engine drives, the output of automatic transmission with hydraulic torque converter 10 is output shafts 16, it is used for driving and is connected to suitable parts of vehicle, for example: the diff on the axle drive shaft, part-time case or similar in prior art known parts, power train part recited above is influenced by several means and monitors, and these devices will carefully be introduced one by one.These devices comprise: the position of throttle or accelerator open degree detecting device 18, and it detects the vehicle accelerator of driver's control or the position of other fuel-control assembly; An engine speed detector 20, its detection of engine rotating speed; A clutch operating device 22, it is used for closed and opens power-transfer clutch 14; 24, one variable speed operation devices 26 of a transmission input speed detector, it makes change-speed box 10 shift into selected speed ratio effectively, also has a transmission output shaft speed detector 28 and brake operations detector 29.
The information that provides said apparatus arrives central process unit 30 and/or receives order from central process unit 30, central process unit 30 comprises that simulation and/or digital and electronic calculate and functional arrangement, its shape and structure do not belong to any part among the present invention, central process unit also receives the information of shift controller 32, by this shift controller, the driver can select reverse gear (R), neutral gear (N) or several D Drive (D, D
1, vehicle operating mode DL) is in order alternately to place selectable D
1With the position of DL, an independent highway/cross-country select switch can be set.Power supply (not shown) and/or charging fluid source (not shown) are given that various detections, operation and/or processing equipment provide electricity and/or aerodynamic force.Power train part recited above and controller can be understood from prior art, also can be by above-mentioned US Patent № .4, and 361,060,3,776,048,4,038,889,4,226,295, understand in more detail.
FOR ALL WE KNOW, central process unit 30 is by the direct input information of following detector, they are: represent the detector 18 of throttle position at that time, the detector 20 of representing instant engine speed, represent transmission input speed detector 24 at that time, represent transmission output shaft speed detector 28 at that time, the operation scheme detector 32 that detector 29 whether the expression vehicle is braked and expression are selected by vehicle operators or driver.Except that these direct inpuies, central process unit 30 can provide in the future the circuit of the input differential signal of self-detector 20 to produce one and calculate signal, the acceleration/accel of this signal indication driving engine.This circuit is used for relatively coming the incoming signal of self-detector 24 and 28, to calculate instant transmitting ratio, this circuit also with instant transmitting ratio with come the signal comparison of self-detector 28 to detect whole throttles with the engine speed that produces a calculating, this circuit also is used for calculating under the stable drive ratio and the engine speed of estimating under given or detected output shaft speed.Central process unit comprises that also a memory unit is used for storing the data of some input and/or calculating, and when predetermined case takes place with the receiver zero clearing, on the other hand, central process unit also can comprise a time set, cond for example, it is with a known speed discharge, and zero setting is measured preset time at interval when predetermined situation takes place.The special circuit that produces above-mentioned functions is known in prior art, and its example can be with reference to above-mentioned US Patent № .4,361,060.
Insert the memory unit of central process unit 30 and can store information, for example the position of the direction of last gear shift, throttle, throttle position rate of change, car speed or class likelihood data.Memory unit can zero setting when extraordinary circumstances take place, and for example driving engine or car speed surpass predetermined value, throttle wide, operation throttle and overstep the extreme limit, take place gear shift etc.
We know, a given known transmission is, the relation of output shaft speed and car speed is known, suppose a complete ingear master clutch 14, drive shaft speed and engine speed equate and expression input shaft/engine speed, instant transmitting ratio and any two signals in output shaft/car speed can be determined all three parameters fully.
A purpose of central process unit is according to a program and parameter instant or that store, selective transmission should be at the best transmitting ratio of this operation, and send shift command according to data instant and/or that store in case of necessity, speed change or gear shift are to selected best transmitting ratio.
The transmitting ratio of a representative type automated mechanical transmission 10, promptly drive shaft speed specific output axle speed has 16 transmitting ratios forward, and 2 transmitting ratios backward all can be from seeing with reference to figure 3.Shelves between the transmitting ratio are differential about 20 (20%) percent forward as can be seen, and for example, the transmitting ratio shelves are differential forward will think to equate for all.
One of radical function of automation change control system is will select and the ingear transmitting ratio according to driver's requirement and operational circumstances decision, ideally, an electronically controlled change-speed box can be designed to improve vehicle performance, saving fuel or raising effect, however the raising of a specific character (that is: saving of fuel) usually causes the reduction of other performance (that is: effect).Moreover, also have the restriction that must consider, the degree that its restriction property can be enhanced.This restriction comprises the assurance vehicle safety and makes the unnecessary shift number that increases tired driver reduce to minimum.For the great majority restriction, there is not absolute standard.
The driver selects D mode (road running) to show to central process unit 30 on gear shift selector 32 does not need peak feature, in this mode, can select the 5th grade as initial shelves according to highway gear shift distribution graph gear chooser system that can fuel saving, and select follow-up gear shift, i.e. raising speed and reduction of speed gear shift.
Similarly, the D of driver's selective speed gear shift finder
1(1 grade) or DL(low grade) mode, show that to central process unit 30 hope under the situation of saving burnup, runs on peak feature.Use D simultaneously
1Mode, gear shift chooser system can be with third gear as initial shelves, and under the DL mode, with first grade as initial shelves.The then gear shift of carrying out is changed shelves and is changed shelves, all is to select according to the cross-country gear shift distribution graph that can improve vehicle performance.
The mode that falls back, R and R
1Preferably directly select to carry out by the driver, do not need usually also not carry out at R and R by gear shift selector
1Between autoshift.
One of the program of central process unit or main purpose of logic rules are to produce shift pattern or gear shift each point distribution graph, as shown in Figure 2, the gear shift each point distribution graph that is produced by central process unit will determine whether change-speed box should keep transmitting ratio at that time, still should raising speed shift into and shift into than the underneath drive ratio than high transmission ratio or reduction of speed, gear shift each point distribution graph is determined according to data instant or that store by preset program, and this distribution graph is selected like this.That is: at transmitting ratio that fuel as far as possible effectively utilizes with operate between the transmitting ratio under the vehicle optimum performance and take all factors into consideration.Throttle position that gear shift each point distribution graph as shown in Figure 2, expression are represented with the percentum of give full throttle position and the functional relation between the engine speed.Engine speed can directly detect or preferably calculate, and this engine speed as known in the prior art, does not change in gear shift moment.
Just as used herein, one than underneath drive than being expressed as a transmitting ratio with higher drive shaft speed and ratio of output shaft speed, for example, the 9th grade is lower than the tenth grade and be to slow down from the tenth grade to the 9th grade gear shift.
The shift pattern of highway (A-B-C and X-Y-Z) and cross-country (E-F-G and X '-Y '-Z ') provides a basis as controlling the function that throttle comes governing speed by the driver for the adjusting change-speed box.Above-mentioned distribution graph is obtained by engine performance basically.The usefulness that comprises all accessory equipments that drive driving engine.
Engine speed signal is represented with erpm in Fig. 2, and this signal is to obtain with the selected instant gear ratio value of electronic control package by the transmission output shaft signal times.When being preferably in each new selection, data of selecting and multiplier factor do to revise and the machine performance of not reference reality immediately, thereby, if desired, during the gear shift of response output shaft speed continually varying, allow the new gear shift of beginning, throttle position is represented with the percentum of give full throttle from 0%-100%.
With reference to Fig. 2, the gear shift distribution graph comprises raising speed gear shift line A-B-C on the highway and the reduction of speed gear shift line X-Y-Z on the highway.In brief, for operating in, just do not need gear shift by in reduction of speed gear shift line X-Y-Z and the determined space of lifting gear shift line A-B-C.Raising speed gear shift line A-B-C goes up or its zone, the right for operating in, and requires to change to time high transmission ratio, goes up or its left area for operating in reduction of speed gear shift line X-Y-Z, requires to change to time minimum transmitting ratio.Certainly, can understand, independent shift point distribution graph can be used in all transmitting ratios of change-speed box or independently the gear shift distribution graph can be used for each instant transmitting ratio by generation.Common, the transmitting ratio shelves are differential big more between each grade, and independent shift point distribution graph is used for each instant transmitting ratio is unreasonable thinking.
Can know the tested speed that other is detected or calculate, for example drive shaft speed, output shaft speed, car speed etc. can replace engine speed in gear shift each point distribution graph as shown in Figure 2.
FOR ALL WE KNOW, for a specific combustion engine, for example be used for the turbocharging type diesel motor on the truck, for each throttle position an engine speed (being typically expressed as number of revolution per minute or " RpM ") is arranged, or the scope of an engine speed is arranged, fuel uses the most effective in this scope.The running condition of this optimum fuel degree of utilization is represented by line N-O-p.The rotating speed of driving engine is determined by the speed and the engagement transmission mechanism transmitting ratio of vehicle.This transmitting ratio only is to be easy to the variable selected for use usually, is shown in briefly in the transmission device among Fig. 1 with fixing increment.Therefore in order to obtain maximum fuel efficient, change-speed box should fast as far as possible and gear shift frequently, keeps driving engine and operates in as far as possible near maximum fuel efficiency line N-O-p.This can be by leaning on raising speed gear shift line A-B-C and reduction of speed gear shift line X-Y-Z to such an extent that finish recently as far as possible.Simultaneously, keep a minimum lag at least, avoid relevant speed in for maximum fuel efficiency line N-O-p, to swing back and forth on the suitable transmitting ratio.
Another care problem when selecting desirable transmitting ratio, i.e. vehicle performance when determining gear shift each point distribution graph.Vehicle performance can be defined as at least one to fixed-ratio down and the acceleration capacity when avoiding unsuitable raising speed continually or reduction of speed gear shift to be unnecessary gear shift.Normally, best vehicle performance requriements raising speed gear shift and reduction of speed gear shift line and the optimal fuel efficient line N-O-p cooresponding distance of being separated by.
Clearly, fuel-saving to greatest extent with often the conflicting to greatest extent of vehicle efficiency, in gear shift each point distribution graph, it is to seek to obtain properly settling of the best between fuel efficiency and vehicle performance that raising speed gear shift and reduction of speed gear shift line are set.Because the relative importance of fuel efficiency and vehicle performance is by central process unit 30, according to changing under instant and/or the different operation conditionss of information stored by a program decision, so, raising speed gear shift line and reduction of speed gear shift line preferably are not static but dynamic, dynamic mobile gear shift line is known, and at US Patent № .4,361,060 existing going through.Typically, the gear shift line is according to instant and/or information stored, the acceleration/accel of for example last gear shift direction, vehicle, the acceleration/accel of driving engine, throttle position rate of change, the operation of vehicle brake etc. and move.
It is very important understanding gear shift each point distribution graph relevant with throttle position and engine speed, unless selecting the vehicle operating mode of reverse gear, neutral gear or D Drive is beyond being regulated by finder 32, the operator is accelerator pedal operation or the control of other fuel to the input of change-speed box.Therefore, determine the gear shift distribution graph, and distribution graph is made part revise by the partial response throttle position.Operator's requirement all will be finished when determining the best transmitting ratio that change-speed box will move by central process unit.
Here the noun of Shi Yonging " throttle " means device or mechanism, shows the fuel quantity of his required supply engine by its vehicle operators.Normally, the operator can select the fuel any amount promptly to close from the 0%(throttle) to the maximum supply value of fuel 100%(throttle wide).Actual control setup can be that a carburetter, fuel injector and bunker oil inject frame etc.Said here throttle position means that the operator needs the selection of supply engine fuel quantity, represents with the percentum that accounts for the fuel Maximum Supply Quantity.
E-F-G is the raising speed gear shift distribution graph of cross-country gear shift distribution graph, and E '-F '-G ' is the raising speed gear shift distribution graph as dynamic adjustments in reduction of speed gear shift starting back, and as above-mentioned US Patent №, 4,361,060 is described in detail.X '-Y-Z ' is cross-country reduction of speed gear shift distribution graph.
Gear shift each point distribution graph also comprises a raising speed gear shift limit (UL), this place's change-speed box again the raising speed gear shift in order to avoid reach the speed relevant with engine breakdown, also have a reduction of speed gear shift tolerance limit (DE) simultaneously, this place's change-speed box again the reduction of speed gear shift in order to avoid reach the speed relevant with engine breakdown.The raising speed gear shift limit (UL) and reduction of speed gear shift tolerance limit (DE) are not the functions of throttle position.
If operating point moves on to A-B-C or the raising speed gear shift limit (UL) the right, the raising speed gear shift then takes place, if operating point moves on to the reduction of speed gear shift tolerance limit DE and the X-Y-Z track left side, the reduction of speed gear shift then takes place.All these represent that entopic distribution graph is easy to move in response to various signals.These move with their reasonableness and will be described later.
Under the situation with grade change-speed box that jumps, engine speed is than determining by transmitting ratio shelves jump (transmitting ratio rate of change) between any two gears.Adopt foregoing distribution graph, the operating point that each raising speed gear shift will cause being located on or near in reduction of speed gear shift line arrives next high tap position, vice versa, swing between the gear will be inevitable, some additional clearance between raising speed gear shift and reduction of speed gear shift distribution graph need and allow, yet the excessive space of eliminating swing can cause reducing on a kind of conservation of fuel of not expecting.For overcoming this problem, controller moves the gear shift distribution graph as the gear shift result.After the raising speed gear shift, reduction of speed gear shift distribution graph moves towards the direction that engine speed reduces.After the reduction of speed gear shift, raising speed gear shift distribution graph moves towards the direction that engine speed raises.
Seem most top indicated, engine speed is a computing value rather than accurate engine speed, and it is consistent with the engine speed of transmission system fixation case, and it takes advantage of output shaft speed to decide by suitable transmitting ratio.Because actual engine speed under gear shift moment or analogue, will change, so use that calculate rather than actual engine speed then more desirable.
Operation according to the change-speed box of said process is applicable to highway situation, and when cross-country situation, load-carrying vehicle must be climbed the steep gradient, and the performance that vehicle adopts the highway mode to move is usually unsatisfactory.When a gradient, the inertia of vehicle can cause rapid deceleration, and make vehicle ' and/or quicken needed moment and need increase sharply, in this case, only depend on the shift logic circuit of one grade of reduction of speed that the operation of expectation can not be provided, because repeatedly require the reduction of speed gear shift not adopt, engagement time is lower than ideal value with the ratio of non-engagement time, and provides the permission ratio of maximum torque can not be selected.
At least under the operation scheme of selectable off-road capability, overcome this shortcoming, improvement control system of the present invention is with a program or process work, and when allow to give an order program thus or process can estimate step to reduction of speed И shelves (И for greater than 1 integer, best 2 or 3).
Use D
1Or the mode of DL, when detecting instant engine speed, it can adopt and calculate or measure, it is not more than the lower gear engine speed under instant throttle position, i.e. this speed DE line and X '-Y '-Z ' left side in Fig. 2, central process unit will estimate automatically reduction of speed shift into И than the underneath drive ratio whether decide under same engine speed (usually by the output shaft speed decision) И than the anticipated engine speed of underneath drive ratio less than estimating maximum engine speed (speed of selection is to avoid surpassing the rotating speed that driving engine and/or associated components are damaged).If the engine speed that calculates surpasses the maximum engine speed that allows, order shifts into next lower transmitting ratio from instant shelves reduction of speed, if И is greater than 2, И subtract that 1 the low-grade engine speed of estimating can calculate and with the driving engine maximum permission speed relatively, if estimate to be no more than the maximum engine speed that allows at И the engine speed than the underneath drive ratio, central process unit 30 will start reduction of speed to the И than the underneath drive ratio.
Preferably finish reduction of speed change to И than underneath drive than before, promptly before meshing with the И shelves, central process unit will be with instant car speed budget engine speed once more, if and when the anticipated engine speed that calculates be no more than instant throttle position order from И individual than underneath drive the engine speed during than the raising speed gear shift, promptly in Fig. 2, do not arrive the right of UL or E ' F ' G ', central process unit is just ordered and is carried out the gear shift of multistage step reduction of speed, if the anticipated engine speed that is calculated is no more than the raising speed switching speed, controller will be ordered from previous transmission engage ratio and be changed to the next one than the underneath drive ratio, if or И is greater than 2, and do not require that from transmitting ratio raising speed gear shift immediately at that time the N that controller can order engagement to be lower than previous transmission engage ratio subtracts 1 grade.
For the sake of simplicity, in the following Example, suppose that a change-speed box has front transmitting ratio as shown in Figure 3, and all grades are differential equal, and all instant transmission engage ratio are allowed to use same shelves distribution graph.The value of И will be along with the differential variation between selected gear ratio value and the transmitting ratio, and under differential situation about not waiting, changes by instant transmission engage ratio.
If И equals 2, select D
1The operation scheme of (or DL), change-speed box was meshed with the tenth gear at that time, throttle position standard-sized sheet 90 percent and remain unchanged, it is maximum that to allow engine speed be 2400 rev/mins.When detecting one during less than 1675 rev/mins engine speed, controller will calculate under car speed is 2375 rev/mins weighing apparatus definite value, the anticipated engine speed of inferior low gear ratio (promptly the 8th grade):
(that is: 1675 rev/mins * 3.53 ÷ 2.49)
When the engine speed at the 8th grade that is calculated allows engine speed less than maximum, with the order of sending to the 8th gear shift.Preferably, for fear of after two-stage or multistage reduction of speed gear shift, and then raising speed gear shift, controller will the 8th grade of engagement calculate once more in the past by last engagement shelves to И low-grade, i.e. the 8th grade anticipated engine speed (promptly from the tenth grade of downward time low grade).If vehicle has maintained under the constant speed, will be at the 8th grade of engine speed of being estimated (2375 rev/mins) above engine speed (2225 rev/mins) from the 8th grade of raising speed gear shift, then controller changes one grade downwards with order, i.e. the inferior minimum transmitting ratio (for example from the 10th grade to the 9th grade) from previous transmission engage ratio to the next one.Yet if when the reduction of speed gear shift is started, vehicle has decelerated to and has been not more than the about 92.7% of the initial speed of a motor vehicle, and anticipated engine speed will be less than the engine speed from the 8th grade of raising speed gear shift, and sends to the 8th gear shift order.
In another example, if the value of И equals 3, and all other assumed values remain unchanged, controller will at first calculate at the downward low three-speed driving engine of instant engagement shelves estimates speed, promptly the 7th grade, in the time of the 7th grade, the engine speed of expectation equals 2875 rev/mins (1675 rev/mins * 4.27 ÷ 2.49), and this value surpasses maximum 2400 rev/mins of the engine speeds that allow.Then controller will send one from instant engagement shelves to the order (promptly from the tenth grade to the 9th grade) of the low gear shift of the next one or preferably calculate И-1 grade, promptly from instant engagement class to inferior lower gear, the 8th grade, its process is as previously mentioned.
As can be seen, grade formula reduction of speed gear shift that jumps is used in to be wished that car speed keeps and/or increases, or meets the requirements substantially under the deceleration of major general's vehicle reduces to minimum situation.Simultaneously, it also is desirable that grade formula that jumps is slowed down for preventing that the Jake brake deceleration from causing unnecessary gear shift aspect, and slowing down with grade formula that jumps to make the Jake brake number of times how much reduce to some extent than the single-stage deceleration.
In view of above-mentioned viewpoint, controller can require throttle position to surpass a predetermined value (promptly surpassing 60 percent) and/or not use car brakeing on request, improves grade shift property that jumps downwards before grade shift procedure because the startup that the driver wishes in the above to be discussed jumps.
For transmitting ratio change-speed box more than, for example change-speed box 10, under any given operation scheme, usually have several permission ingear transmitting ratios (promptly do not cause racing of the engine, stop and can drag goods), because the increase of transmitting ratio quantity, suppose to equate that with the shelves number under given operation scheme, the transmitting ratio number of permission also will increase substantially.For instance, allow to be engaged on third gear, fourth speed, the 5th grade and/or the 6th D Drive usually at 56 kilometers/hour change-speed boxs 10 with 16 speed.
In representative prior art, the gear shift distribution graph of automated mechanical transmission and in the present invention in highway (D) operation scheme, under the condition of given throttle position, raising speed gear shift line and reduction of speed gear shift line are selected to improve or increase the saving of fuel, and usually by less than two differential engine speed differences it being separated, the saving that strengthens fuel requires to select for use the highest permission transmitting ratio (being minimum engine speed) usually.Therefore, functional arrangement is difficult to realize greater than one grade of ground reduction of speed gear shift.If because the condition of service of high-drag slows down vehicle rapidly, so only to change one grade then be not enough for keeping suitable performance characteristic to reduction of speed.
In the present invention, adopt one or more modes (D
1, D
L) functional arrangement improve or improve vehicle performance.Improve vehicle performance, need minimum permission transmitting ratio (high engine speed).Therefore, even shift point is not by separately reaching dangerous values less than the differential of N after the driving engine expectation speed that calculates is jumping grade reduction of speed gear shift, functional arrangement slows down " supposition " rapidly and can jump a grade reduction of speed gear shift.Then if desired, controller will be ordered the raising speed gear shift, or preferably, and controller is in the startup grade reduction of speed gear shift that jumps, but before finishing, calculate anticipated engine speed once more and have only when not requiring that can be engaged to N under the situation of rapid raising speed gear shift definitely low-grade.
Though the present invention has described some particular point in front, can see that some possible modifications will can not break away from the spirit and the scope of claim of the present invention.
Claims (19)
1, an improved automatic speed-changing system that is used for vehicle, has a control throttle driving engine (12), accelerator control device by driver operation (18) and one have between input shaft and output shaft (16) the selectively change-speed box (10) of ingear transmitting ratio combination, above-mentioned input shaft is linked to each other with above-mentioned driving engine effectively, above-mentioned transmission system comprises a central process unit (30), it has the device that receives a plurality of incoming signals, and these incoming signals comprise: the incoming signal (18) of the above-mentioned throttle position control setup of (1) expression; (2) incoming signal (20) of the above-mentioned engine speed of expression; (3) incoming signal (28) of the above-mentioned car speed of expression, above-mentioned central process unit comprises such device, it is according to a program, handle above-mentioned incoming signal, to transmitting ratio that suits the requirements of given incoming signal group selection, and produce output signal, thereby above-mentioned transmission system is according to said procedure work, the device that links to each other with change-speed box (28) response is from the above-mentioned output signal of above-mentioned treater, and drive speed transmission meshes one of above-mentioned transmitting ratio combination effectively effectively.
Above-mentioned treater comprises that the device that is used to handle above-mentioned incoming signal provides the anticipated engine velocity amplitude of a calculating, and this value representation can be selected the pre-metering rotating speed of driving engine under the selected car speed of gear ratio sets in closing in difference; Automatic speed-changing system is characterised in that:
Said procedure has first operation scheme (D
1Or DL) wherein be equal to or less than when requiring reduction of speed to shift into next than the engine speed of underneath drive ratio when detection of engine speed, this program is effective to the following step:
(a) at first calculate under the instant car speed and N than underneath drive than under one first anticipated engine velocity amplitude (wherein N is the integer greater than 1):
(b) then, when if the first anticipated engine velocity amplitude is equal to or greater than its numerical value when driving engine allows maximum speed, start the intermediate drive ratio that reduction of speed shifts into instant transmission engage ratio and N the transmitting ratio lower than instant transmission engage ratio, when if the first anticipated engine velocity amplitude is lower than the maximum engine speed value that is allowed, starts reduction of speed and shift into N than the underneath drive ratio.
2, according to the improved automatic speed-changing system that is used for vehicle of claim 1, wherein said procedure is also to following effective:
(c) start reduction of speed shift into И than underneath drive than after, and engage И than underneath drive than before, calculate И than underneath drive than the time instant car speed the second anticipated engine velocity amplitude;
(d) then, if second engine speed value that calculates equal or exceed from И than underneath drive the engine speed value during than the raising speed gear shift, mesh previous transmission engage ratio and more individual than the intermediate drive ratio between the underneath drive ratio than previous low И, if second engine speed value that calculates be lower than from И than underneath drive the engine speed value during than the raising speed gear shift, then И of order engagement is than the underneath drive ratio.
3, the system that has improved according to claim 1 comprises driver operation Operation Mode Selection device (32) in addition, and above-mentioned incoming signal comprises that in addition (4) one have two kinds of selectable vehicles advance operation scheme (D, D at least
1DL) incoming signal of one of operation selection, said procedure has one second operation scheme, wherein in case detect engine speed be equal to or less than shown in reduction of speed shift into than underneath drive than the time engine speed the time, it is low-grade that said procedure only just orders reduction of speed to shift into the next one.
4, the system that has improved according to claim 2, comprise driver operation Operation Mode Selection device (32) in addition, and above-mentioned incoming signal comprises that in addition one of (4) expression has the advance operation of one of operation scheme of two kinds of selectable vehicles at least and selects incoming signal, said procedure has one second operation scheme, wherein, in case detect engine speed shift into downwards shown in being equal to or less than than underneath drive than the time engine speed, said procedure only just order reduction of speed change one grade to next than the underneath drive ratio.
5, according to the improvement shown in the claim 1 system, wherein И is a time underneath drive ratio than the underneath drive ratio.
6, according to claim 2, the 3 or 4 described systems that improved, wherein И is time underneath drive ratio than the underneath drive ratio.
7, according to claim 2,4, the described system that has improved, wherein, above-mentioned treater comprises the acceleration device when being used for will ordering the raising speed gear shift after order starts the reduction of speed gear shift.
8, the system that has improved according to claim 6, wherein above-mentioned treater comprises the acceleration device when being used for will ordering the raising speed gear shift after order starts the reduction of speed gear shift.
9, according to claim 1,2, the 3 or 4 described systems that improved, wherein, if the throttle position that detects is equal to or less than with reference to throttle position, said procedure only reduction of speed change one grade to next than the underneath drive ratio.
10, the described according to Claim 8 system that has improved wherein, above-mentionedly is equal to or greater than 60% of throttle wide with reference to throttle position.
11, according to claim 1,2,3, the 4 described systems that improved, comprise in addition that (5) expression drivers implement vehicle brake (29) if incoming signal and detect driver's apply brake operation, then said procedure with the reduction of speed gear shift only to next grade than the underneath drive ratio.
12, the system that has improved according to claim 6, comprise in addition that (5) expression drivers implement vehicle brake (29) if incoming signal and detect driver's apply brake operation, then said procedure with the reduction of speed gear shift only to next grade than the underneath drive ratio.
13, according to the described system that has improved of claim, comprise in addition that (5) expression drivers implement vehicle brake (29) if incoming signal and detect driver's apply brake operation, then said procedure with the reduction of speed gear shift only to next grade than the underneath drive ratio.
14, the system that has improved according to claim 4, wherein, when in above-mentioned second mode, sending the raising speed shift command, the engine speed of engine speed when in above-mentioned first mode, sending the raising speed shift command.
15, the system that has improved according to claim 6, wherein, when in above-mentioned second mode, sending the raising speed shift command, the engine speed of engine speed when in above-mentioned first mode, sending the raising speed shift command.
16, the system that has improved according to claim 7, wherein, when in above-mentioned second mode, sending the raising speed shift command, the engine speed of engine speed when in above-mentioned first mode, sending the raising speed shift command.
17, the system that has improved according to claim 9, wherein, when in above-mentioned second mode, sending the raising speed shift command, the engine speed of engine speed when in above-mentioned first mode, sending the raising speed shift command.
18, the system that has improved according to claim 11, wherein, when in above-mentioned second mode, sending the raising speed shift command, the engine speed of engine speed when in above-mentioned first mode, sending the raising speed shift command.
19, an improved automatic speed-changing system that is used for vehicle, has a control throttle driving engine, an accelerator control device and a change-speed box with a plurality of transmitting ratio combinations of between input shaft and output shaft, selecting selectively by driver operation, above-mentioned input shaft is linked to each other with above-mentioned driving engine effectively, above-mentioned transmission system comprises a message handler, it has the device that receives a plurality of incoming signals, these incoming signals comprise: the incoming signal of the control setup of the above-mentioned throttle position of (1) expression, (2) incoming signal of the above-mentioned engine speed of expression, (3) incoming signal of the above-mentioned car speed of expression, above-mentioned treater comprises such processing equipment, it is according to a program, handle above-mentioned incoming signal, come for required transmitting ratio of a given incoming signal group selection, and generation output signal, thereby above-mentioned transmission system is according to said procedure work, and the device that links to each other with change-speed box response is from the above-mentioned signal of above-mentioned treater, drive speed transmission meshes one of above-mentioned gear ratio sets effectively, improved being characterised in that:
Said system comprises selector installation, thereby the driver can select first operation scheme, if wherein the engine speed of Yu Jiing is no more than a predetermined maximum value at instant car speed, then can start from instant transmission engage ratio reduction of speed and shift into И than the underneath drive ratio, (wherein И is the integer greater than 1) and select second operation scheme, wherein the reduction of speed gear shift only limit to from instant transmission engage ratio to next shelves than the underneath drive ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85107497 CN1007226B (en) | 1985-10-09 | 1985-10-09 | Automatic transinission control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85107497 CN1007226B (en) | 1985-10-09 | 1985-10-09 | Automatic transinission control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85107497A CN85107497A (en) | 1987-04-15 |
| CN1007226B true CN1007226B (en) | 1990-03-21 |
Family
ID=4795656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85107497 Expired CN1007226B (en) | 1985-10-09 | 1985-10-09 | Automatic transinission control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1007226B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100487284C (en) * | 2006-08-03 | 2009-05-13 | 同济大学 | Electric controlling device of automatic speed variator for vehicle |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3231006B2 (en) * | 1997-08-28 | 2001-11-19 | 株式会社シマノ | Gear change control device for bicycle |
| CN101851942B (en) * | 2010-04-16 | 2011-12-28 | 山推工程机械股份有限公司 | Automatic gear shift drive device for bulldozer and gear shift control method |
| US20160339916A1 (en) * | 2015-05-21 | 2016-11-24 | Ford Global Technologies, Llc | Systems and methods for smooth driving mode transitions for a motor vehicle |
| JP6848841B2 (en) * | 2017-11-30 | 2021-03-24 | トヨタ自動車株式会社 | Vehicle control device |
-
1985
- 1985-10-09 CN CN 85107497 patent/CN1007226B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100487284C (en) * | 2006-08-03 | 2009-05-13 | 同济大学 | Electric controlling device of automatic speed variator for vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85107497A (en) | 1987-04-15 |
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