CN102654194A - Road turn detection gear shift control method of double clutch transmission automobile - Google Patents
Road turn detection gear shift control method of double clutch transmission automobile Download PDFInfo
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- CN102654194A CN102654194A CN2012101603702A CN201210160370A CN102654194A CN 102654194 A CN102654194 A CN 102654194A CN 2012101603702 A CN2012101603702 A CN 2012101603702A CN 201210160370 A CN201210160370 A CN 201210160370A CN 102654194 A CN102654194 A CN 102654194A
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Abstract
The invention provides a road turn detection gear shift control method of a DCT (Double Clutch Transmission) automobile. The road turn detection gear shift control method comprises the following steps that: when a system judges that the DCT automobile starts road turn detection gear shift control, the DCT automobile obtains power through delaying gear shift and in-advanced downshift; and the DCT automobile normally shifts gears according to an MAP picture until the system judges that the DCT automobile enters a straight road system and stops the road turn detection gear shift control. The system can judge an automobile turning turn degree by calculating a wheel speed difference of driving wheels, wherein when the wheel speed difference of the driving wheels is certain, the turn degree is smaller while the vehicle speed is higher, and the turn degree is greater while the vehicle speed is lower; and when the vehicle speed is certain, the turn degree is smaller when the wheel speed difference is smaller, and the turn degree is greater when the wheel speed difference is greater. When the system starts the road turn detection gear shift control to prevent a vehicle from frequently starting and stop the road turn detection gear shift control on an intermittent road turn surface (such as a sky way), the system sets a delay time of starting and stopping the road turn detection gear shift control, so that a driver can supply the enough power to the vehicle when making a turn. Therefore, the conditions of influencing on the driving comfort and the driving stability, caused by insufficient generated power, can be avoided; and the driving security can be ensured simultaneously.
Description
Technical field
The invention belongs to the automobile speed variator shift control technique, be specifically related to the method for gear shift control under a kind of double-clutch automatic gearbox (DCT) vehicle bend situation.The driver turned the situation of operating to vehicle under, vehicle taked bend detection gear-shifting control method to carry out process of power shift control.
Background technique
DCT speed changer (abbreviation of Double Control Transmission) is on original manual transmission basis, to have increased a clutch; Add that simultaneously TCU control lets its automaitc shfit; Be directed to five fast DCT vehicles at this, gear be divided into odd gear (1 grade, 3 grades, 5 grades) and even number gear (comprise reverse gear, 2 grades, 4 grades) separate with clutch 2 with clutch 1 respectively and engage alternately gear shift.This structure has solved the problem of traditional single clutch automatic transmission (AMT) shifting shock.Tradition single clutch speed changer (AMT) gearshift procedure must face the process of power interruption; Therefore can't avoid shifting shock; And dual-clutch transmission (DCT) can let current gear oncoming clutch separate and next gear will oncoming clutch engage through two clutch work of working in coordination in gearshift procedure, thereby the power increase that the power of i.e. cut-off clutch transmission reduces the engaging clutch transmission guarantees that through control the variation that reaches imperceptible power in the gearshift procedure of making a concerted effort to remain unchanged of two clutch transmits does not produce the purpose of shifting shock simultaneously.The DCT cost is higher than manual transmission (MT) and automatic mechanical transmission (AMT); But it is more much lower than automatic transmission (AT) and buncher (CVT) cost; Therefore it equally with manual transmission (MT) and automatic mechanical transmission (AMT) possesses transmission efficiency height, economical and practical advantage.The DCT speed changer is owing to have transmission efficiency height, mechanism's compactness, reliable operation, cheap, extremely each big automobile vendor favor of advantage such as gear shift is smooth-going, to its research also in intensification year by year.Under the technological not mature enough situation of Chinese CVT, the DCT speed changer meets Chinese national conditions as a kind of new product very much, will have very big development in Chinese future.But also there are its some shortcomings in the DCT speed changer.Here being primarily aimed at the DCT car situation that influences driving comfortability and stability that gear shift causes when turning studies.
Situation to the gear shift when turning of DCT car probably has following situation:
When vehicle driving is passed through bend; Quicken perhaps speed of a motor vehicle reduction if step on the throttle and will take shift-down action according to gear shift MAP figure (like Fig. 1), wherein gear shift MAP figure abscissa is the speed of a motor vehicle, and y coordinate is a gas pedal; ED_12 is that economic model rises second gear for one grade, and all the other gear shift by that analogy.Routine is carried out gear shift according to economic model gear shift collection of illustrative plates on the level road.When vehicle driving when the bend, will take the gear shift action if come loose throttle or the speed of a motor vehicle increase according to gear shift MAP figure (like Fig. 1).Vehicle load obviously strengthens in the turning process, if carry out driving comfortability and the stability that gear shift must cause car load to be short of power and influence vehicle according to gear shift MAP figure.Serious situation will cause vehicle flame-out, thereby slipping and causing traffic accident to influence safety possibly appear in vehicle when climbing is turned.
Summary of the invention
The objective of the invention is to overcome above many shortcomings; Provide a kind of DCT car bend to detect gear-shifting control method; Make the driver when turning, let vehicle obtain sufficient power and avoid producing the situation that influences driving comfortability and stability that is short of power and brings, guarantee the safety of driving simultaneously.
In order to achieve the above object, the gear-shifting control method of the present invention's proposition is:
When judge getting into bend, system's (referring to transmission control unit TCU) detects gear shift control back through the delay gear shift and lower category in advance and let vehicle gain impetus; Judge that up to system getting into the straight way system withdraws from bend detection gear shift control, vehicle schemes to go up and down normally shelves according to MAP.System can calculate driving wheel wheel speed difference and judge the turn inside diameter camber.Wherein regularly the high more camber of the speed of a motor vehicle is more little when wheel speed differs from one, and the low more camber of the speed of a motor vehicle is big more; When the more little camber of the speed of a motor vehicle one timing wheel speed difference is more little, heavy camber is big more more for wheel speed difference.When having got into bend, system detects gear shift control; In order to prevent that vehicle from detecting gear shift control at the upward frequent entry and exit bend of desultory curved road surface (like sky way), system is provided with an entry and exit bend and detects the gear shift control lag time.
Method of the present invention specifically comprises following process:
Gather wheel speed signal and pass to antilock braking system (ABS) (ABS) through wheel speed sensors, antilock braking system (ABS) is passed to transmission control unit (TCU) with wheel speed signal through the CAN bus;
Transmission control unit is analyzed with the wheel speed signal of accepting, gearshift position signal, GES (V), vehicle current gear Gp signal and according to the new gear Gp_new signal that MAP figure calculates;
When wheel speed difference W absolute value detects the condition value of gear shift control greater than the entering bend of setting, and gearshift position is when the D shelves, and transmission control unit (TCU) will be judged after will postponing a period of time Tin earlier again;
If wheel speed difference W absolute value still detects the condition value of gear shift control greater than the entering bend of setting; And gearshift position is still when the D shelves; Transmission control unit (TCU) gets into bend immediately and detects gear shift control, does not detect gear shift control otherwise transmission control unit (TCU) does not get into bend;
After getting into bend and detecting gear shift control, in case new gear change Gp_new signal sends, transmission control unit (TCU) keeps current gear Gp, and retard time T, after retard time, T finished, system carried out Gp_new, i.e. Gp=Gp_new immediately;
If system has got into bend and has detected gear shift control; When wheel speed difference W absolute value less than set withdraw from bend and detect the condition value of gear shift control the time or gearshift position during not at the D shelves; Transmission control unit (TCU) will postpone a period of time Tout, judge again then;
If wheel speed difference W absolute value still less than withdrawing from of setting condition value or gearshift position that bend detects gear shift control still not when the D shelves, transmission control unit (TCU) withdraws from bend immediately and detects gear shift control, gets into normal gear shift control.
After the DCT speed changer detects gear-shifting control method through above bend; Can avoid car load is short of power in the turning process the situation and the generation of traffic accident; Simultaneously can guarantee driving comfortability and stability; Make the gear shift of vehicle when turning to satisfy driver's intention, guarantee the Security of bend situation down train, do not influence normal gear shift method simultaneously.
Description of drawings
Fig. 1 is gear shift MAP figure;
Fig. 2 is that the figure that explains is controlled in bend detection gear shift;
Fig. 3 is that bend detects gear shift control logic control graph.
Embodiment
In order to understand the present invention better, below combine accompanying drawing that the bend in this programme is detected gear shift control through embodiment to carry out detailed explanation.
Referring to Fig. 2, the process that bend detects gear shift control is following:
Gather wheel speed signal and pass to ABS (antilock braking system (ABS)) through wheel speed sensors, ABS passes to TCU (transmission control unit) with wheel speed signal through the CAN bus.
TCU analyzes wheel speed signal, gearshift position signal, GES (V), the current gear signal Gp of vehicle of acceptance and next the gear signal Gp_new that calculates according to MAP figure.The near front wheel wheel speed and off-front wheel wheel speed difference are designated as W, and (W is that positive number interval scale vehicle bends to right and goes; W is a negative interval scale vehicle turning driving left; Because the camber to right travel W representative is symmetrical left; Therefore this get the W absolute value calculate get final product); Be that abscissa wheel speed difference is that y coordinate is set up the bend gear shift and detected and get into exit criteria demarcation form (like table 1, wherein carry out linear fit between 8 list datas automatically and draw calibration line and be designated as w, like calibration line w among Fig. 2) with the speed of a motor vehicle.Wherein calibration value is nonnegative number and is merely reference value in the form, demarcates the engineer and can demarcate according to the real vehicle situation.
Table 1, bend detection wheel speed difference get into exit criteria and demarcate form
When wheel speed difference W absolute value detects the condition value of gear shift control greater than the entering bend of setting; And gearshift position is when the D shelves; For avoiding erroneous judgement disconnected or frequently get into bend and detect gear shift control, transmission control unit (TCU) will postpone a period of time and judge again after (being designated as Tin).If condition value and gearshift position that wheel speed difference W absolute value still detects gear shift control greater than the entering bend of setting still when the D shelves transmission control unit (TCU) get into bend immediately and detect gear shift control, detect gear shift control otherwise transmission control unit (TCU) can't get into bend.
After getting into bend detection gear shift control, in case new gear change Gp_new sends, transmission control unit (TCU) keeps current gear Gp, wherein is designated as T retard time.
If transmission control unit (TCU) has got into bend and has detected gear shift control; When wheel speed difference W absolute value less than set withdraw from bend and detect the condition value of gear shift control the time or gearshift position during not at the D shelves, disconnected or frequently withdraw from bend and detect shift control and will postpone a period of time and judge again after (being designated as Tout) for avoiding erroneous judgement.If wheel speed difference W absolute value still less than withdrawing from of setting condition value or gearshift position that bend detects gear shift control still not when the D shelves, transmission control unit (TCU) withdraws from bend immediately and detects gear shift control, gets into normal gear shift control.
For further understanding; Suppose that other conditions do not consider, only consider that wheel speed difference detects gear shift control entry and exit condition effect to bend, can be with reference to Fig. 2; When wheel speed difference W absolute value when getting into the calibration line w of exit criteria; Judge behind the system delay time T in, detect gear shift control, do not get into bend and detect gear shift control if wheel speed difference W is not more than the w system if wheel speed difference W absolute value gets into bend during still greater than w.If after the fruit system got into bend detection gear shift control, in case Gp_new produces new gear change, system all kept and postpone current gear Gp, system carries out Gp_new, i.e. Gp=Gp_new immediately after retard time, T finished.When wheel speed difference W absolute value when getting into the calibration line w of exit criteria, judge behind the system delay time T out, detect gear shift control if wheel speed difference W absolute value withdraws from bend during still less than w, get into normal gear shift control, i.e. Gp=Gp_new.If the w system that is not less than wheel speed difference W does not withdraw from bend detection gear shift control.
Be illustrated in figure 3 as bend of the present invention and detect the logic control scheme that gear shift control is taked, wheel speed sensors is gathered wheel speed signal and is passed to ABS, and ABS passes to TCU with wheel speed signal through the CAN bus.TCU will take turns speed difference W and be designated as 1 greater than w, and W is designated as 0 smaller or equal to w; With Tin after the time W be designated as 1 greater than w, W is designated as 0 smaller or equal to w; Gearshift position is that D all is designated as 1, and all the other all are designated as 0.TCU carries out AND-operation with above Boolean and obtains a result 1 or 0, and wherein 1 representative system gets into bend immediately and detects gear shift control, and 0 representative system does not get into bend and detects gear shift control.After the AND-operation result is 1, i.e. system's entering bend detects gear shift control, TCU will take turns speed difference W and be designated as 0 greater than w, and W is designated as 1 smaller or equal to w; With Tout after the time W be designated as 0 greater than w, W is designated as 1 smaller or equal to w; TCU carries out AND-operation with above Boolean and obtains a result 1 or 0.Gearshift position is that D all is designated as 0, and all the other all are designated as 1.TCU carries out OR operation again with above Boolean and obtains a result 1 or 0, and wherein 1 representative system withdraws from bend immediately and detects gear shift control, and 0 representative system does not withdraw from bend and detects gear shift control.
Certainly demarcating the engineer can demarcate the value of T, Tin, Tout, w according to actual conditions and demarcation experience.Here give an example T=3s, Tin=1s, Tout=1s, w is for example like table 1.Here to withdraw from bend and detect that gear-shifting control method is unlikely to too frequent Tin, the Tout time can not be too short in order to protect to get into, in order to withdraw from bend and to detect gear-shifting control method according to normal entering of real bend situation, Tin and Tout time can not be oversize.Can not be too short in order to realize that bend detects the gear-shifting control method T time, to let the driver lose no time comfortable in order not influence normal gear shift, and the T time can not be oversize.W demarcates different according to the different speed of a motor vehicle; If calibration value causes being not easy to get into bend detection gear-shifting control method too greatly under the same speed of a motor vehicle; If too for a short time causing of calibration value is easy to get into bend detection gear-shifting control method, influence the up-down shelves under the normal forthright situation on the contrary.
Claims (3)
1. the bend of a double-clutch automatic gearbox vehicle detects gear-shifting control method, and it is characterized in that: said method comprises following process:
Gather wheel speed signal and pass to antilock braking system (ABS) (ABS) through wheel speed sensors, antilock braking system (ABS) is passed to transmission control unit (TCU) with wheel speed signal through the CAN bus;
Transmission control unit is analyzed with the wheel speed signal of accepting, gearshift position signal, GES (V), vehicle current gear Gp signal and according to the new gear Gp_new signal that MAP figure calculates;
When wheel speed difference W absolute value detects the condition value of gear shift control greater than the entering bend of setting, and gearshift position is when the D shelves, and transmission control unit (TCU) will be judged after will postponing a period of time Tin earlier again;
If wheel speed difference W absolute value still detects the condition value of gear shift control greater than the entering bend of setting; And gearshift position is still when the D shelves; Transmission control unit (TCU) gets into bend immediately and detects gear shift control, does not detect gear shift control otherwise transmission control unit (TCU) does not get into bend;
After getting into bend and detecting gear shift control, in case new gear Gp_new signal sends, system keeps current gear Gp, and retard time T, after retard time, T finished, transmission control unit (TCU) was carried out new gear Gp_new, i.e. Gp=Gp_new immediately;
When wheel speed difference W absolute value less than set withdraw from bend and detect the condition value of gear shift control the time or gearshift position during not at the D shelves, transmission control unit (TCU) will postpone a period of time Tout, judge again then;
If wheel speed difference W absolute value still less than withdrawing from of setting condition value or gearshift position that bend detects gear shift control still not when the D shelves, transmission control unit (TCU) withdraws from bend immediately and detects gear shift control, gets into normal gear shift control.
2. bend according to claim 1 detects gear-shifting control method, it is characterized in that: said transmission control unit (TCU) will be taken turns speed difference W and will be designated as 1 greater than w, and W is designated as 0 smaller or equal to w; W behind the retard time Tin is designated as 1 greater than w, and W is designated as 0 smaller or equal to w; With gearshift position is that D all is designated as 1, and all the other all are designated as 0; Said TCU carries out AND-operation with above Boolean and obtains a result 1 or 0, wherein 1 represents transmission control unit (TCU) to get into bend detection gear shift control immediately, and on behalf of transmission control unit (TCU), 0 do not get into bend detects gear shift control; After the AND-operation result is 1, i.e. transmission control unit (TCU) entering bend detects gear shift control, TCU will take turns speed difference W and be designated as 0 greater than w, and W is designated as 1 smaller or equal to w; W behind the retard time Tout is designated as 0 greater than w, and W is designated as 1 smaller or equal to w; Gearshift position is that D all is designated as 0, and all the other all are designated as 1; TCU carries out OR operation again with above Boolean and obtains a result 1 or 0, wherein 1 represents transmission control unit (TCU) to withdraw from bend detection gear shift control immediately, and on behalf of transmission control unit (TCU), 0 do not withdraw from bend detects gear shift control.
3. bend according to claim 1 and 2 detects gear-shifting control method, it is characterized in that: the value of said T, Tin, Tout, w can be demarcated according to actual conditions and demarcation experience by demarcating the engineer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104641154A (en) * | 2012-09-19 | 2015-05-20 | 丰田自动车株式会社 | Vehicle control device |
| CN104850141A (en) * | 2015-06-11 | 2015-08-19 | 贵州华烽电器有限公司 | Drive system for force feedback control servo motor |
| CN104868803A (en) * | 2015-06-11 | 2015-08-26 | 贵州华烽电器有限公司 | Position feedback control servo motor driving system |
| CN109058450A (en) * | 2018-09-12 | 2018-12-21 | 汽解放汽车有限公司 | A kind of identification of commercial vehicle automatic speed changer for machine bend and its shift control method |
| CN114135659A (en) * | 2021-11-30 | 2022-03-04 | 东风商用车有限公司 | Heavy truck AMT curve gear selection method, device, equipment and storage medium |
| CN115405686A (en) * | 2022-09-30 | 2022-11-29 | 上海汽车变速器有限公司 | Dual clutch downshift control method, device, storage medium and device |
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| CN114135659A (en) * | 2021-11-30 | 2022-03-04 | 东风商用车有限公司 | Heavy truck AMT curve gear selection method, device, equipment and storage medium |
| CN115405686A (en) * | 2022-09-30 | 2022-11-29 | 上海汽车变速器有限公司 | Dual clutch downshift control method, device, storage medium and device |
| CN115405686B (en) * | 2022-09-30 | 2024-02-20 | 上海汽车变速器有限公司 | Dual clutch downshift control method, apparatus, storage medium and device |
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