CN203412835U - Limp-home oil way system of continuously variable transmission with wet clutch - Google Patents
Limp-home oil way system of continuously variable transmission with wet clutch Download PDFInfo
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- CN203412835U CN203412835U CN201320465532.3U CN201320465532U CN203412835U CN 203412835 U CN203412835 U CN 203412835U CN 201320465532 U CN201320465532 U CN 201320465532U CN 203412835 U CN203412835 U CN 203412835U
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Abstract
The utility model discloses a limp-home oil way system of a continuously variable transmission with a wet clutch. The system comprises a hydraulic oil pump, a hand valve, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve, a first mechanical valve, a second mechanical valve, a third mechanical valve, a fourth mechanical valve, a reverse gear brake, a forward gear clutch, a main cylinder, a secondary cylinder, a switch valve and a fifth mechanical valve, wherein when a TCU (transmission control unit) works normally, the switch valve is in a power-on working state, and a control oil way of the fourth mechanical valve is controlled by the second electromagnetic valve; and when the TCU drive levels are all closed, the switch valve is in a reset state due to the spring effect, and the control oil way of the fourth mechanical valve is controlled by the fifth mechanical valve. After the TCU cannot work normally and all drive levels are closed, a handle is pulled to the D position, and an accelerator pedal is pushed down; when the engine speed reaches a certain threshold, the on-gear operation of the forward gear can be realized, and the handle is pulled to the R position, and the accelerator pedal is pushed down; and when the engine speed reaches a certain threshold, reverse driving can be realized.
Description
Technical field
The utility model is relevant with the hydraulic control system of stepless speed changer of car CVT, is specifically related to wet clutch formula infinitely variable transmission at the oil-way system of in emergency circumstances realizing limp-home of all driving Close Alls of gearbox electronic control unit TCU.
Background technique
At present, on market, the gearbox of main flow comprises five types of manual transmission (MT), automatic mechanical type gearbox (AMT), double clutch gearbox (DCT), infinitely variable transmission (CVT) and hydraulic automatic gearboxes (AT), wherein infinitely variable transmission CVT have gear shift smooth-going, under the operating mode of city the obvious advantage of oil-saving effect, relatively be applicable to the road conditions of China, therefore this gearbox is more and more higher in the entrucking rate of China.
According to the form of driving system, divide, the infinitely variable transmission CVT that accounts in the market main flow has two kinds of structures, a kind of is infinitely variable transmission CVT with fluid torque converter, another kind is the infinitely variable transmission CVT with wet clutch, wherein the infinitely variable transmission CVT with fluid torque converter has advantages of that starting impact is less, but because the volume of fluid torque converter is larger, be unfavorable for arrangement, and there is the problem of churning loss, so in the face of day by day harsh oil consumption limit value, the space that this infinitely variable transmission is further optimized is extremely restricted.
By contrast, infinitely variable transmission CVT small volume with wet clutch, be convenient to arrangement, and after vehicle to run, clutch is by complete combination, there is not the problem of churning loss, oil-saving effect is also more obvious, its hydraulic circuit is as Fig. 1, shown in Fig. 2, comprise hydraulic-pressure pump 1, the first solenoid valve 11, the second solenoid valve 12, the 3rd solenoid valve 13, the 4th solenoid valve 14, the first mechanical valve 21, the second mechanical valve 22, the 3rd mechanical valve 23, the 4th mechanical valve 24, manually operated valve 2, wherein manually operated valve 2 is four position and four-way reversing valves, all the other each valves are two-bit triplet selector valve.The first solenoid valve 11, for regulating the pilot pressure of the first mechanical valve 21, is finally realized the regulating and controlling of main oil pressure; The second solenoid valve 12 is for regulating the pilot pressure of the 4th mechanical valve 24, and that finally realizes forward gear clutch 6/ reverse gear brake 5 fills/drain the oil control, and the switching of forward gear clutch 6 and reverse gear brake 5 is realized and switching by stirring handle by driver; The 3rd solenoid valve 13, for regulating the pilot pressure of the second mechanical valve 22, is finally realized the regulating and controlling of master cylinder 7 pressure; The 4th solenoid valve 14, for regulating the pilot pressure of the 3rd mechanical valve 23, is finally realized the regulating and controlling of time cylinder 8 pressure; Wherein, forward gear clutch 6 and reverse gear brake 5 are arranged on a planet row, form driving system; Master cylinder 7 and time cylinder 8 form speed variator system.
The filler opening of the delivery outlet of hydraulic-pressure pump 1 and the first mechanical valve 21, the filler opening of the first solenoid valve 11, the filler opening of the second solenoid valve 12, the filler opening of the second mechanical valve 22, the filler opening of the 3rd solenoid valve 13, the filler opening of the 3rd mechanical valve 23, the filler opening of the 4th solenoid valve 14 is communicated with, the control end of the first mechanical valve 21 is communicated with the oil outlet of the first solenoid valve 11, the oil outlet of the first mechanical valve 21 is communicated with the filler opening of the 4th mechanical valve 24, the control end of the 4th mechanical valve 24 is communicated with the oil outlet of the second solenoid valve 12, the oil outlet of the 4th mechanical valve 24 is communicated with the filler opening of manually operated valve 2, by the oil charging-discharging that pulls handle can realize forward gear clutch or reverse gear brake, control, the control end of the second mechanical valve 22 is communicated with the oil outlet of the 3rd solenoid valve 13, the control end of the 3rd mechanical valve 23 is communicated with the oil outlet of the 4th solenoid valve 14, second oil outlet of mechanical valve 22 and the master cylinder of speed variator system 7 are connected, the oil outlet of the 3rd mechanical valve 23 is connected with the inferior cylinder 8 of speed variator system, the oil outlet of the first mechanical valve 21 is also connected with cooling system 4.When gear shifting handle is positioned at D shelves (manually operated valve is in D position), as shown in Figure 1, the second solenoid valve 12 is controlled the oil-filled speed of forward gear clutch 6, when shift handle is positioned at R shelves (manually operated valve is in R position), as shown in Figure 2, forward gear clutch 6 releases, the second solenoid valve 12 is controlled the oil-filled speed of reverse gear brake 5.
Yet, when the key sensor of vehicle breaks down or other mechanical failure occurs and then cause all driving stage Close Alls of gearbox electronic control unit TCU, conventional the infinitely variable transmission CVT forward gear clutch with wet clutch and reverse gear brake will separate, can not transferring power, therefore, fault vehicle can only stop travelling in this case, cannot rely on self power to return to repair shop, to user, brings inconvenience.
Model utility content
Technical problem to be solved in the utility model is to provide a kind of limp-home oil-way system of the infinitely variable transmission containing wet clutch, do not changing under the prerequisite of infinitely variable transmission body, adjust hydraulic circuit, make it in the situation that there is no TCU or TCU driving stage Close All, can rely on self power to realize limp-home function.
For solving the problems of the technologies described above, the limp-home oil-way system of the infinitely variable transmission containing wet clutch that the utility model provides, comprise hydraulic-pressure pump, manually operated valve, the first solenoid valve, the second solenoid valve, the 3rd solenoid valve, the 4th solenoid valve, the first mechanical valve, the second mechanical valve, the 3rd mechanical valve, the 4th mechanical valve, reverse gear brake, forward gear clutch, master cylinder and time cylinder, also comprise a switch valve and one the 5th mechanical valve, described switch valve, the 5th mechanical valve, the second solenoid valve and the 4th mechanical valve are switched for the oil circuit of normal mode of operation and limp-home mode,
When gearbox electronic control unit works, switch valve is in the state of working on power, and the oil circuit control of the 4th mechanical valve is by the second electromagnetic valve;
When gearbox electronic control unit driving stage Close All, switch valve is in spring reset state, and the oil circuit control of the 4th mechanical valve is controlled by the 5th mechanical valve.
Further, the delivery outlet of hydraulic-pressure pump with the filler opening of the first mechanical valve, the filler opening of the filler opening of the first solenoid valve, the second solenoid valve, the filler opening of the filler opening of the 5th mechanical valve, the second mechanical valve, the filler opening of the filler opening of the 3rd solenoid valve, the 3rd mechanical valve, the filler opening of the 4th solenoid valve be communicated with;
The control end of the first mechanical valve is communicated with the oil outlet of the first solenoid valve, and the oil outlet of the first mechanical valve is communicated with the filler opening of the 4th mechanical valve; The 4th oil outlet of mechanical valve and the filler opening of manually operated valve are communicated with, and by driver, pull handle to change the working position of manually operated valve, realize the oil charging-discharging of forward gear clutch or reverse gear brake and control;
Switch valve is when working on power state, and its filler opening is communicated with the oil outlet of the second solenoid valve, and oil outlet is communicated with the control end of the 4th mechanical valve; Switch valve is when spring reset state, and its filler opening is communicated with the oil outlet of the 5th mechanical valve, and oil outlet is still communicated with the control end of the 4th mechanical valve;
The control end of the second mechanical valve is communicated with the oil outlet of the 3rd solenoid valve, the oil outlet of the second mechanical valve is connected with the master cylinder of speed variator system, the control end of the 3rd mechanical valve is communicated with the oil outlet of the 4th solenoid valve, and the oil outlet of the 3rd mechanical valve is connected with the inferior cylinder of speed variator system.
In addition, the oil outlet of described the first mechanical valve is connected with cooling system.
Usefulness of the present utility model is:
1) adopt the infinitely variable transmission CVT of oil-way system of the present utility model, when TCU cisco unity malfunction, close after all driving stages, driver can be by push handle position on the D position pedal of stepping on the throttle simultaneously, make motor remain on the mode on certain rotating speed threshold values, realizing forward gears moves at shelves, handle is allocated to the R position pedal of simultaneously stepping on the throttle, motor is remained on certain rotating speed threshold values, can realize reverse travel, therefore fault vehicle can not sat, need to not wait for rescue in original place, can rely on the self power maintenance station of driving voluntarily to go to;
2) adopt oil-way system of the present utility model, can make the reliability of system and robustness greatly improve, promoted to a greater extent the entrucking utilization rate of wet clutch formula CVT;
3) use this oil channel structures without the control strategy and the matched data that change system, can continue to use original system material, there is good inheritance.
Accompanying drawing explanation
Fig. 1 is the D shelves hydraulic schematic diagram of the existing infinitely variable transmission CVT with wet clutch;
Fig. 2 is the R shelves hydraulic schematic diagram of the existing infinitely variable transmission CVT with wet clutch;
Fig. 3 is the hydraulic schematic diagram of the infinitely variable transmission normal mode of operation D shelves with wet clutch of the present utility model;
Fig. 4 is the hydraulic schematic diagram of the infinitely variable transmission normal mode of operation R shelves with wet clutch of the present utility model;
Fig. 5 is the hydraulic schematic diagram of the infinitely variable transmission limp-home mode D shelves with wet clutch of the present utility model;
Fig. 6 is the hydraulic schematic diagram of the infinitely variable transmission limp-home mode R shelves with wet clutch of the present utility model.
Wherein description of reference numerals is as follows:
1 is hydraulic-pressure pump; 2 is manually operated valve; 3 is switch valve; 4 is cooling system; 5 is reverse gear brake; 6 is forward gear clutch; 7 is master cylinder; 8 is time cylinder; 11 is the first solenoid valve; 12 is the second solenoid valve; 13 is the 3rd solenoid valve; 14 is the 4th solenoid valve; 21 is the first mechanical valve; 22 is the second mechanical valve; 23 is the 3rd mechanical valve; 24 is the 4th mechanical valve; 25 is the 5th mechanical valve.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.
The limp-home oil-way system of the infinitely variable transmission CVT with wet clutch that the utility model provides, as shown in Figures 3 to 6, on conventional wet clutch formula infinitely variable transmission CVT hydraulic circuit (as shown in Figure 1 and Figure 2) basis, without changing gearbox body structure, need only increase switch valve 3 and the 5th mechanical valve 25.Described switch valve 3, the 5th mechanical valve 25, the second solenoid valve 12 and the 4th mechanical valve 24 are switched for the oil circuit of normal mode of operation and limp-home mode; When gearbox electronic control unit works, switch valve 3 is in open mode, and the oil circuit control of the 4th mechanical valve 24 is controlled by the second solenoid valve 12; When gearbox electronic control unit driving stage Close All, switch valve 3 is in closed condition, and the oil circuit control of the 4th mechanical valve 24 is controlled by the 5th mechanical valve 25.
The delivery outlet of hydraulic-pressure pump 1 with the filler opening of the first mechanical valve 21, the filler opening of the filler opening of the first solenoid valve 11, the second solenoid valve 12, the filler opening of the filler opening of the 5th mechanical valve 25, the second mechanical valve 22, the filler opening of the filler opening of the 3rd solenoid valve 13, the 3rd mechanical valve 23, the filler opening of the 4th solenoid valve 14 be communicated with; The control end of the first mechanical valve 21 is communicated with the oil outlet of the first solenoid valve 11, and the oil outlet of the first mechanical valve 21 is communicated with the filler opening of the 4th mechanical valve 24; The oil outlet of the 4th mechanical valve 24 is communicated with the filler opening of manually operated valve 2, by driver, pulls handle to change the working position of manually operated valve 2, and the forward gear clutch 6 of driving system or reverse gear brake 5 are carried out to oil charging-discharging control; The filler opening of switch valve 3 is communicated with the oil outlet of the second solenoid valve 12, and return opening is communicated with the oil outlet of the 5th mechanical valve 25, and oil outlet is communicated with the control end of the 4th mechanical valve 24; The control end of the 5th mechanical valve 25 and filler opening are communicated with; The control end of the second mechanical valve 22 is communicated with the oil outlet of the 3rd solenoid valve 13, second oil outlet of mechanical valve 22 and the master cylinder of speed variator system 7 are connected, the control end of the 3rd mechanical valve 23 is communicated with the oil outlet of the 4th solenoid valve 14, and the oil outlet of the 3rd mechanical valve 23 is connected with the inferior cylinder 8 of speed variator system.The oil outlet of described the first mechanical valve 21 is connected with cooling system 4.
When TCU works, switch valve 3 is subject to TCU control in open mode and shield the effect of the 5th mechanical valve 25, makes the oil circuit control of the 4th mechanical valve 24 not be subject to the impact of the 5th mechanical valve 25, and is still subject to the control of the second solenoid valve 12, and assurance system is normally moved.At TCU, break down, after TCU driving stage Close All, the Returnning spring of switch valve 3 plays a role, and makes switch valve 3 in acquiescence closed condition, the oil circuit control of the 4th mechanical valve 24 is connected with the output circuit of the 5th mechanical valve 25.By system oil pressure, change the spring resistance that can overcome to some extent the 5th mechanical valve 25, realize the variation that it opens cross-section area, and then change the input oil pressure of forward gear clutch 6 or reverse gear brake 5.Simultaneously, the oil pressure of master cylinder 7 and time cylinder 8 is also directly subject to the influence of rotation speed of motor, the in the situation that of driver's accelerator pedal, the situation that there will not be steel band to come off, moment of torsion that can stable delivery motor, thereby realize under limping operating mode, vehicle can rely on self power to move forward and backward and travel.
As conventional wet clutch formula CVT, still use the first mechanical valve 21, the second mechanical valve 22, the 3rd mechanical valve 23, the 4th mechanical valve 24, the 5th mechanical valve 25 to realize pressure regulation, the hydraulic oil that finally exports cooling system, driving system, speed variator system to is connected with low pressure oil way, has met parts design requirement.
As shown in Figure 3, when oil-way system is during in D shelves normal mode of operation, TCU control switch valve 3 makes its valve piece in state shown in Fig. 3, now switch valve 3 had both shielded the effect of the 5th mechanical valve 25, make again the effect of other each solenoid valve unaffected, guarantee that oil-way system of the present utility model is consistent with conventional system under normal mode of operation D shelves, can reliable operation, by the second solenoid valve 12, controlled the oil-filled speed of forward gear clutchs 6.
As shown in Figure 4, when oil-way system is during in normal mode of operation, driver is changed to R position by D position by stirring handle, can make the interior release of forward gear clutch 6, and make reverse gear brake 5 interior oil-filled.Switch valve 3 is controlled by TCU, its valve piece is in state shown in Fig. 4, now it had both shielded the effect of the 5th mechanical valve 25, make again the effect of other each solenoid valve unaffected, guarantee that oil-way system of the present utility model is consistent with original system under normal mode of operation R shelves, can reliable operation, by the second solenoid valve 12, controlled the oil-filled speed of reverse gear brakes 5.
As shown in Figure 5, when TCU breaks down, close after all driving stages, system is when D shelves limp-home mode, and the Returnning spring of switch valve 3 works, and makes switch valve 3 get back to default conditions, and its valve piece is in state shown in Fig. 5.Now, the oil circuit control of the 4th mechanical valve 24 is connected with the output circuit of the 5th mechanical valve 25, the effect conductively-closed of the second solenoid valve 12, and the pilot pressure of the 4th mechanical valve 24 is from the output of the 5th mechanical valve 25.Because the control end of the 5th mechanical valve 25 is connected with input end, after only having input oil pressure higher than certain threshold value, just can overcome spring force, the control end of delivery pressure to the four mechanical valve 24.Because the incoming pressure of the 4th mechanical valve 24 adopts non-quantitation pump from hydraulic-pressure pump 1() main oil pressure that produces, at TCU driving stage Close All and system, enter after limp-home mode, the modulating valve of main oil pressure (the first solenoid valve 11) is inoperative, system oil pressure is only linear with the rotating speed of motor, therefore,, after engine speed is higher than certain threshold value, system oil pressure can overcome spring force gradually, increase gradually the opening area of the 5th mechanical valve 25, forward gear clutch 6 is combination gradually also.Meanwhile, now cooling system 4 oil pressure are maximum, and the pressure of master cylinder 7, inferior cylinder 8 is maximum, and steel band forms a constant-speed ratio, moment of torsion that can stable delivery motor, and vehicle starts to travel.In this process, the 5th 25 of mechanical valve assurance is when motor is during higher than certain rotating speed, clutch is just understood combination, and when driver receives throttle, the rotating speed of motor declines, system oil pressure is less than the spring force of Returnning spring, the opening of the 5th mechanical valve 5 is closed gradually, and output terminal oil pressure is connected with oil cylinder, and forward gear clutch 6 is opened gradually, cut off engine loading, prevent engine misses.
As shown in Figure 6, when system is during in limp-home mode, driver is changed to R position by D position by stirring handle, can make the interior release of forward gear clutch 6, and make reverse gear brake 5 interior oil-filled.In this process, the effect of each valve is similar under D shelves limp-home mode with principle, repeats no more.
Adopt the infinitely variable transmission CVT of oil-way system of the present utility model, when TCU cisco unity malfunction, close after all driving stages, driver can be by push handle position on the D position pedal of stepping on the throttle simultaneously, make motor remain on the mode on certain rotating speed threshold values, realizing forward gears moves at shelves, handle is allocated to the R position pedal of simultaneously stepping on the throttle, motor is remained on certain rotating speed threshold values, can realize reverse travel, therefore fault vehicle can not sat, and need to not wait for rescue in original place, can rely on the self power maintenance station of driving voluntarily to go to; Adopt oil-way system of the present utility model, can make the reliability of system and robustness greatly improve, promoted to a greater extent the entrucking utilization rate of wet clutch formula CVT; Use this oil channel structures without the control strategy and the matched data that change system, can continue to use original system material, there is good inheritance.
By specific embodiment, the utility model is had been described in detail above, this embodiment is only preferred embodiment of the present utility model, and it not limits the utility model.In the situation that not departing from the utility model principle; those of ordinary skills under the prerequisite of not making creative work to aspects such as the composition of valve in the trend of the valve arrangement in oil-way system, oil circuit and oil circuit, annexations by any modification, be equal to all other embodiments that the modes such as replacement, improvement obtain, in the technology category that all should be considered as protecting at the utility model.
Claims (3)
1. the limp-home oil-way system containing the infinitely variable transmission of wet clutch, comprise hydraulic-pressure pump (1), manually operated valve (2), the first solenoid valve (11), the second solenoid valve (12), the 3rd solenoid valve (13), the 4th solenoid valve (14), the first mechanical valve (21), the second mechanical valve (22), the 3rd mechanical valve (23), the 4th mechanical valve (24), reverse gear brake (5), forward gear clutch (6), master cylinder (7) and time cylinder (8), it is characterized in that
Also comprise a switch valve (3) and one the 5th mechanical valve (25), described switch valve (3), the 5th mechanical valve (25), the second solenoid valve (12) and the 4th mechanical valve (24) are switched for the oil circuit of normal mode of operation and limp-home mode;
When gearbox electronic control unit works, switch valve (3) is in the state of working on power, and the oil circuit control of the 4th mechanical valve (24) is controlled by the second solenoid valve (12);
When gearbox electronic control unit driving stage Close All, switch valve (3) is in spring reset state, and the oil circuit control of the 4th mechanical valve (24) is controlled by the 5th mechanical valve (25).
2. the limp-home oil-way system of the infinitely variable transmission containing wet clutch according to claim 1, is characterized in that,
The delivery outlet of hydraulic-pressure pump (1) with the filler opening of the filler opening of the first mechanical valve (21), the first solenoid valve (11), the filler opening of the filler opening of the second solenoid valve (12), the 5th mechanical valve (25), the filler opening of the filler opening of the second mechanical valve (22), the 3rd solenoid valve (13), the filler opening of the filler opening of the 3rd mechanical valve (23), the 4th solenoid valve (14) be communicated with;
The control end of the first mechanical valve (21) is communicated with the oil outlet of the first solenoid valve (11), and the oil outlet of the first mechanical valve (21) is communicated with the filler opening of the 4th mechanical valve (24); The oil outlet of the 4th mechanical valve (24) is communicated with the filler opening of manually operated valve (2), by driver, pulls handle to change the working position of manually operated valve (2), and the forward gear clutch of driving system (6) or reverse gear brake (5) are carried out to oil charging-discharging control;
Switch valve (3) is when working on power state, and its filler opening is communicated with the oil outlet of the second solenoid valve (12), and oil outlet is communicated with the control end of the 4th mechanical valve (24); Switch valve (3) when spring reset state, its filler opening be communicated with the oil outlet of the 5th mechanical valve (25), oil outlet is still communicated with the control end of the 4th mechanical valve (24);
The control end of the second mechanical valve (22) is communicated with the oil outlet of the 3rd solenoid valve (13), the oil outlet of the second mechanical valve (22) is connected with the master cylinder (7) of speed variator system, the control end of the 3rd mechanical valve (23) is communicated with the oil outlet of the 4th solenoid valve (14), and the oil outlet of the 3rd mechanical valve (23) is connected with the inferior cylinder (8) of speed variator system.
3. the limp-home oil-way system of the infinitely variable transmission containing wet clutch according to claim 1, is characterized in that, the oil outlet of described the first mechanical valve (21) is connected with cooling system (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320465532.3U CN203412835U (en) | 2013-07-31 | 2013-07-31 | Limp-home oil way system of continuously variable transmission with wet clutch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320465532.3U CN203412835U (en) | 2013-07-31 | 2013-07-31 | Limp-home oil way system of continuously variable transmission with wet clutch |
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| Publication Number | Publication Date |
|---|---|
| CN203412835U true CN203412835U (en) | 2014-01-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320465532.3U Withdrawn - After Issue CN203412835U (en) | 2013-07-31 | 2013-07-31 | Limp-home oil way system of continuously variable transmission with wet clutch |
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| CN (1) | CN203412835U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410801A (en) * | 2013-07-31 | 2013-11-27 | 联合汽车电子有限公司 | Limp home oil circuit system of continuously variable transmission with wet clutch |
| CN112277925A (en) * | 2020-11-06 | 2021-01-29 | 潍柴动力股份有限公司 | Vehicle speed adjusting method and device and electronic equipment |
-
2013
- 2013-07-31 CN CN201320465532.3U patent/CN203412835U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410801A (en) * | 2013-07-31 | 2013-11-27 | 联合汽车电子有限公司 | Limp home oil circuit system of continuously variable transmission with wet clutch |
| CN103410801B (en) * | 2013-07-31 | 2016-09-28 | 联合汽车电子有限公司 | The limp-home oil piping system of the infinitely variable transmission containing wet clutch |
| CN112277925A (en) * | 2020-11-06 | 2021-01-29 | 潍柴动力股份有限公司 | Vehicle speed adjusting method and device and electronic equipment |
| CN112277925B (en) * | 2020-11-06 | 2021-10-29 | 潍柴动力股份有限公司 | Vehicle speed adjusting method and device and electronic equipment |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140129 Effective date of abandoning: 20160928 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |