WO2010001665A1 - 自動変速機のライン圧制御装置 - Google Patents
自動変速機のライン圧制御装置 Download PDFInfo
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- WO2010001665A1 WO2010001665A1 PCT/JP2009/059185 JP2009059185W WO2010001665A1 WO 2010001665 A1 WO2010001665 A1 WO 2010001665A1 JP 2009059185 W JP2009059185 W JP 2009059185W WO 2010001665 A1 WO2010001665 A1 WO 2010001665A1
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- Prior art keywords
- line pressure
- low
- region
- pressure
- hydraulic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/14—Inputs being a function of torque or torque demand
- F16H59/24—Inputs being a function of torque or torque demand dependent on the throttle opening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/68—Inputs being a function of gearing status
- F16H59/72—Inputs being a function of gearing status dependent on oil characteristics, e.g. temperature, viscosity
Definitions
- the present invention relates to a line pressure control device for an automatic transmission for a vehicle, and more particularly to a line pressure control device for an automatic transmission capable of switching the line pressure in two stages based on the temperature of hydraulic oil.
- Patent Document 1 Japanese Patent Publication No. 6-15900
- Patent Document 2 Japanese Patent Laid-Open No. 2002-89680
- the line pressure during gear shifting is controlled according to the temperature of hydraulic oil of the automatic transmission detected by an oil temperature sensor. Specifically, first, it is determined whether the shift required line pressure is in a low temperature region, a high temperature region, or a transition region between the low temperature region and the high temperature region. And, when the required line pressure during shifting is in the transition region, the controlled line pressure is gradually (linearly) changed between the low-temperature line pressure value and the high-temperature line pressure value. . By configuring the line pressure control device in this way, the line pressure is gradually changed. Thus, there is an effect that the shift shock due to the line pressure control can be reduced without causing a sudden change in the line pressure.
- the line pressure is mapped by the throttle opening (vertical axis, ratio when the effective opening of the throttle is divided into 8) and the vehicle speed (horizontal axis) It is also known to use data to distinguish a low line pressure region and a high line pressure region. When such mapped data is used, the low line pressure region is set so that the torque capacity of the clutch (friction engagement element) does not fall below the engine torque at an arbitrary throttle opening and vehicle speed.
- an object of the present invention is to provide a line pressure control device for an automatic transmission for a vehicle that can improve the fuel economy of the vehicle.
- a further object of the present invention is to change the low line pressure region in the expansion direction of the low line pressure region, or switch the mapped data to the expansion direction of the low line pressure region, so that the transition or switching timing is changed.
- Another object of the present invention is to provide a line pressure control device for an automatic transmission for a vehicle that can effectively prevent the clutch from slipping due to a difference in torque capacity between the clutch and the engine.
- an automatic transmission line pressure control device (10) selects and engages one of a plurality of friction engagement elements (clutch).
- the hydraulic pressure from the hydraulic power source (61) is adjusted to adjust the hydraulic oil base pressure for controlling the friction engagement element.
- the line pressure control apparatus for an automatic transmission for example, when the temperature TATF of the hydraulic oil is low, the friction coefficient of the hydraulic oil increases. By expanding the low pressure region, it is possible to reduce the friction torque of the entire automatic transmission in the traveling state of the vehicle in the expanded region. Thereby, the fuel economy (fuel consumption) of the vehicle can be improved.
- the region changing unit (102) determines whether or not the hydraulic control characteristics (mapped data) are shifted in the direction of expanding the low pressure region.
- the determination unit (103) determines that the low pressure region is changing in the expansion direction, the throttle opening (TH) is fully closed or the line pressure (P) is currently low.
- the region changing unit may be configured to permit the change in the expansion direction of the low pressure region, and otherwise prohibit the change.
- the opening at the accelerator pedal of the vehicle may be used instead of the throttle opening (TH).
- the region determination unit (102) when the determination unit (103) determines that the region changing unit (102) is moving in the direction of reducing the low-pressure region, the region determination unit (102) does not perform the determination by the state determination unit (104). The change may be permitted.
- the low pressure region of the line pressure in the hydraulic control characteristics is expanded while reducing the processing load of the entire line pressure control device (for example, the electronic control unit 10). Can be changed as follows.
- an automatic transmission line pressure control device (10) selects and engages one of a plurality of friction engagement elements (clutch). By adjusting the hydraulic pressure from the hydraulic pressure source (61) in the vehicle automatic transmission (3, 6) for setting a predetermined gear position, the hydraulic oil for operating the friction engagement element is controlled.
- a line control device (10) for an automatic transmission that controls a line (P) pressure serving as a base pressure, wherein the line pressure is set in either a high pressure region or a low pressure region based on the load of the engine (1).
- a storage unit (101) that stores a plurality of hydraulic control characteristics (mapped data) of (P) corresponding to a plurality of temperature regions (for example, a plurality of temperature regions divided by 50 ° C., 80 ° C., and 100 ° C.).
- a plurality of hydraulic control characteristics (mapped data) of (P) corresponding to a plurality of temperature regions (for example, a plurality of temperature regions divided by 50 ° C., 80 ° C., and 100 ° C.).
- hydraulic oil Hydraulic oil temperature sensor (18) for detecting the degree (TATF), and the line pressure stored in the storage unit (101) based on the hydraulic oil temperature (TATF) detected by the hydraulic oil temperature sensor (18)
- a switching unit (102) for switching a plurality of hydraulic control characteristics of (P).
- the line pressure control device for an automatic transmission when the hydraulic oil temperature TATF is low, the automatic transmission is switched to the mapped data in which the low pressure region of the line pressure is expanded. Since the overall friction torque can be reduced, the fuel economy (fuel consumption) of the vehicle can be improved.
- the switching unit (102) is configured so that the temperature of the hydraulic oil (TATF) has transitioned from a high temperature side to a low temperature side in a plurality of temperature regions.
- a determination unit (103) that determines whether or not, and a state determination unit (104) that determines whether the throttle opening (TH) of the vehicle is fully closed or whether the line pressure (P) is currently low.
- the determination unit (103) determines that the temperature of the hydraulic oil is changing from the high temperature side to the low temperature side of the temperature range, and the throttle opening (TH) is fully closed, or
- the switching unit may be configured to permit switching of the hydraulic control characteristics, and otherwise prohibit the switching. Good. This improves the fuel economy (fuel consumption) of the vehicle and is caused by the difference between the torque capacity of the engine and the torque capacity of the clutch due to the line pressure switching from high pressure to low pressure when the hydraulic control characteristics are switched. The slip of the clutch (friction engagement element) which can be performed can be prevented effectively.
- the low line pressure region is expanded in the mapping data of the throttle opening and the vehicle speed, so that the automatic transmission in the expanded region is expanded.
- the friction torque can be reduced as compared with the case of a high line pressure, thereby improving the fuel economy of the vehicle.
- 1 is a block diagram schematically showing a power transmission system and a control system of a vehicle including a line pressure control device for an automatic transmission according to a first embodiment of the present invention. It is a block diagram which shows the control system of the low line pressure area
- FIG. 6 is a graph showing mapping data of line pressure with respect to throttle opening TH ⁇ vehicle speed Nv at 50 ° C. and 80 ° C.
- FIG. It is a graph which shows the relationship between the friction coefficient with respect to the temperature of hydraulic fluid, and the relationship between a line pressure and friction torque, respectively. It is a graph which shows the fuel-consumption improvement rate of the vehicle with respect to whether a low line pressure area
- It is a flowchart which shows the AT control process of a vehicle provided with the line pressure control apparatus of the automatic transmission which concerns on 1st Embodiment of this invention. It is a flowchart which shows the low line pressure area
- FIG. 1 is a block diagram schematically showing a power transmission system and a control system of a vehicle provided with a line pressure control device for an automatic transmission according to a first embodiment of the present invention.
- the power transmission system of the vehicle is set by inputting the engine 1 as a power source, the torque converter 2 as a fluid coupling for transmitting the rotational output of the engine 1 to the transmission gear mechanism 3, and the rotational output of the torque converter 2.
- a differential gear mechanism 4 that distributes the rotational output of the transmission gear mechanism 3 to left and right wheels (for example, rear wheels) 5.
- a hydraulic control device 6 is provided attached to the torque converter 2 and the transmission gear mechanism 3.
- the hydraulic control device 6 is configured to fasten or release a plurality of hydraulically controlled friction engagement elements (such as clutches) provided in the torque converter 2 and the transmission gear mechanism 3 in a predetermined combination. As a result, the hydraulic control device 6 locks up the torque converter 2 and sets the input / output speed ratio in the transmission gear mechanism 3 to a required gear stage.
- the automatic transmission of the vehicle includes the torque converter 2, the transmission gear mechanism 3, the hydraulic control device 6, and the like.
- the line pressure control device of the present embodiment is constituted by a hydraulic control device 6 and an electronic control unit 10 described later.
- a control system for controlling the power transmission system of the vehicle is controlled by a sensor provided in each part of the vehicle, an electronic control unit (ECU) 10 to which an output of each sensor is input, and the electronic control unit 10.
- the hydraulic control device 6 is configured.
- the rotation sensor 11 detects the rotation speed (engine rotation speed) Ne of the input shaft of the torque converter 2.
- the rotation sensor 12 detects the rotation speed Ni of the input shaft of the transmission gear mechanism 3 (that is, the output shaft of the torque converter 2).
- the rotation sensor 13 detects the rotation speed No of the output shaft of the transmission gear mechanism 3.
- the vehicle speed sensor 14 detects the traveling speed (vehicle speed) Nv of the vehicle.
- the vehicle speed Nv may be calculated from the input shaft rotational speed Ni or the output shaft rotational speed No without providing the vehicle speed sensor 14 that exclusively detects the vehicle speed Nv.
- the shift lever position sensor 15 detects the position of the shift lever operated by the driver.
- shift lever positions include, for example, P (parking), R (reverse travel), N (neutral), D (forward travel in automatic transmission mode), and the like.
- a position for manually specifying a specific gear stage such as the third speed, the second speed, or the first speed may be provided.
- the brake sensor 16 detects that the brake is applied when the driver depresses the brake pedal by a predetermined amount or more.
- the throttle sensor 17 detects the throttle opening TH of the engine 1 for which the opening is set according to depression of the accelerator pedal.
- the accelerator pedal sensor 21 detects an accelerator pedal opening APAT corresponding to depression of the accelerator pedal.
- the ATF temperature sensor 18 detects the temperature of hydraulic oil (ATF oil temperature) TATF in the hydraulic control device 6.
- the hydraulic sensor 20 detects the line pressure P regulated by a linear solenoid valve (not shown) in the hydraulic control device 6.
- the cooling water temperature sensor 19 detects the temperature of the engine coolant (cooling water temperature).
- the line pressure control device for an automatic transmission controls the operation of friction engagement elements (such as a clutch) by adjusting the hydraulic pressure from a hydraulic source (oil pump 61 described later) by a regulator valve 62 described later. It controls the line pressure P, which is the base pressure of the hydraulic oil to be used. Further, the line pressure control device changes a low pressure region of a hydraulic control characteristic (mapped data) of the line pressure P, which will be described later, based on the temperature TATF of the hydraulic oil.
- the line pressure control device for an automatic transmission according to the present invention includes an electronic control unit 10 and is implemented as one of various control functions that can be realized by the electronic control unit 10.
- the line pressure control device for an automatic transmission according to the present invention is executed by a computer program provided in the electronic control unit 10.
- the line pressure control device for an automatic transmission according to the present invention is not limited to such a computer program, and can of course be configured with dedicated electronic circuit hardware.
- FIG. 2 is a block diagram showing a control system of a low line pressure region search / change process executed in the line pressure control device for an automatic transmission according to the present invention.
- the electronic control unit 10 includes a storage unit 101 and an area changing unit 102.
- the hydraulic control characteristic of the line pressure P set in either the high pressure region or the low pressure region in the graph of throttle opening TH-vehicle speed Nv (line pressure control characteristic diagram). (Details will be described later) are stored as mapped data.
- the region changing unit 102 expands the low line pressure region in the mapping data of the line pressure P stored in the storage unit 101 based on the hydraulic oil temperature (ATF oil temperature) TATF detected by the ATF temperature sensor 18. It is to be changed.
- the area changing unit 102 includes a determination unit 103 and a state determination unit 104.
- the determination unit 103 determines whether or not the hydraulic control characteristic has shifted in the direction of expanding the low line pressure region, that is, whether or not the temperature TATF of the hydraulic oil has shifted to the low temperature side.
- the state determination unit 104 determines whether the throttle opening TH of the vehicle is fully closed or whether the line pressure P is currently a low line pressure.
- the line pressure P can be switched in two stages of a high line pressure and a low line pressure.
- the determination unit 103 determines that the low line pressure region is transitioning in the expansion direction, the state determination is made that the throttle opening TH is fully closed or the line pressure P is currently the low line pressure.
- the region changing unit 102 permits such a change in the expansion direction of the low line pressure region.
- the area changing unit 102 prohibits the change in other cases.
- the electronic control unit 10 determines the necessary line based on the mapping data in which the low line pressure region is enlarged or changed by the region changing unit 102 or the currently used mapping data and the current running state of the vehicle. A command is output to the hydraulic control device 6 so as to establish the pressure P.
- the characteristic control of the present invention will be described later using a flowchart.
- FIG. 3 is a part of a hydraulic circuit applied to the line pressure control device for an automatic transmission according to the present invention.
- the hydraulic circuit includes an oil pump 61 that serves as a hydraulic pressure source, a regulator valve 62, and a solenoid valve 63.
- the regulator valve 62 adjusts the basic hydraulic pressure supplied from the oil pump 61 to generate a line pressure P that serves as a base pressure of the engagement hydraulic oil of the friction engagement element such as the clutch.
- the solenoid valve 63 supplies auxiliary pressure to the regulator valve 62 in order to switch the line pressure P in two stages. By providing the solenoid valve 63 in this way, a step is added to the regulator valve 62, the pressure receiving area of the regulator valve 62 is switched, and the line pressure P can be switched in two stages of high line pressure and low line pressure. it can.
- the oil pump 61 sucks up hydraulic oil from an oil tank (not shown) and pumps it to the oil passage 70.
- the hydraulic oil is regulated to a predetermined pressure by the regulator valve 62 and then sent to each clutch via the oil passage 71 and a valve (not shown) via a linear solenoid valve.
- the hydraulic control device 6 receives the hydraulic pressure supplied from the oil pump 61 from the oil passage 72 in the hydraulic valve 63. Is opened (ON) by the control of the electronic control unit 10.
- the regulator valve 62 When the solenoid valve 63 is opened, the regulator valve 62 is controlled by the hydraulic oil passing through the oil passage 75 (low line pressure signal pressure) and the hydraulic oil passing through the oil passage 73. Thus, by increasing the pressure receiving area of the regulator valve 62, the line pressure P regulated by the regulator valve 62 is switched from high pressure to low pressure.
- the hydraulic control device 6 performs an operation of switching the line pressure P from a low pressure to a high pressure. Do. In this case, when the solenoid valve 63 is closed (OFF) under the control of the electronic control unit 10, the hydraulic oil (low line pressure signal pressure) is not supplied to the oil passage 75. Thereby, the regulator valve 62 is controlled only by the hydraulic oil that has passed through the oil passage 73. Thus, by reducing the pressure receiving area of the regulator valve 62, the line pressure P is switched from a low pressure to a high pressure. In this embodiment, for example, the high line pressure is set to 9.5 ⁇ 0.25 kg / cm 2 , and the low line pressure is set to 6.0 ⁇ 0.25 kg / cm 2 .
- FIG. 4 is a graph showing the mapping data (hydraulic oil temperature: 100 ° C.) of the line pressure P with respect to the throttle opening TH ⁇ the vehicle speed Nv stored in the storage unit 101.
- the throttle opening TH is shown as a ratio when the entire region is divided into 8 with 8 when fully opened and 0 when fully closed.
- a solid line (thick line) indicates a boundary line between shifts at the time of up-shifting. From the left side, 1st speed (Low) ⁇ 2nd speed ⁇ 2nd speed ⁇ 3rd speed 3rd speed ⁇ 4th speed and 4th speed ⁇ 5th speed ) Is the boundary of the upshift.
- the boundary line between shifts at the time of normal shift down is different from the boundary line between shifts at the time of shift up.
- the boundary line between shifts at the time of downshifting is not shown.
- the throttle opening TH is used on the vertical axis as the load on the engine 1, but it is considered that there is a substantially proportional relationship. Therefore, instead of the throttle opening TH, the accelerator pedal opening TH is used. APAT may be used.
- the mapped data is obtained by calculating the low line pressure region from the torque capacity of the clutch at a line pressure of 6 kgf / cm 2 and a hydraulic oil temperature of 100 ° C.
- the hatched portion indicates a region where the torque capacity of the clutch does not fall below the torque capacity of the engine 1 (the clutch capacity OK region in the figure).
- the region other than the clutch capacity OK region is a region where the torque capacity of the LC (lock-up) clutch does not fall below the torque capacity of the engine 1 (LC capacity OK region in the figure). Show.
- the line pressure during vehicle travel is set using only the mapped data in FIG.
- running at low line pressure covers about 85% during the test running using this mapped data.
- the fuel efficiency fuel economy is improved by 0.26% compared to the case where the line pressure P is not switched between the high line pressure and the low line pressure.
- FIG. 5 is a graph showing mapping data of the line pressure P with respect to the throttle opening TH-vehicle speed Nv at 50 ° C. and 80 ° C.
- FIG. 5B a low line pressure region enlarged with respect to the clutch capacity OK region of the mapped data at the oil temperature of 80 ° C. shown in FIG.
- This mapped data is used, for example, when the temperature of the hydraulic oil is 50 ° C.
- the region changing unit 102 steps through the low line pressure region as the hydraulic oil temperature TATF detected by the ATF temperature sensor 18 changes from high temperature to low temperature. It is changed to enlarge.
- the fuel efficiency (fuel economy) can be improved by 0.30% compared to the case where the line pressure is not switched, and the low line pressure region is reduced according to the temperature TATF of the hydraulic oil. Compared to those that do not change, the fuel efficiency (fuel economy) can be improved by 0.04%.
- the friction coefficient ⁇ of the hydraulic oil increases as the hydraulic oil temperature TATF decreases, and the set line pressure P is low as shown in FIG. 6 (b).
- FIG. 8 is a flowchart showing an AT control process for a vehicle including the line pressure control device for an automatic transmission according to the present invention.
- the low line pressure region search / change process in step S8 is a characteristic part of the present invention, so the flowchart of the subroutine is omitted for the other processes, and the outline of the process is simplified using FIG. It shall be explained in Further, the flowchart of FIG. 8 is repeatedly executed, for example, every 10 msec.
- the electronic control unit 10 first executes various parameter calculation processes for controlling the automatic transmission as a whole (step S1).
- the electronic control unit 10 includes, for example, various rotation sensors 11 to 13, a vehicle speed sensor 14, a shift lever position sensor 15, a throttle sensor 17, an accelerator pedal sensor 21, an ATF temperature sensor 18, a cooling water temperature sensor 19, and a hydraulic pressure sensor 20.
- the detection signals detected by the above are acquired, and various necessary parameters are calculated using the detection signals.
- the electronic control unit 10 performs a shift control process based on the calculated parameters (step S2).
- the electronic control unit 10 sets the shift mode based on the position of the shift lever detected by the shift lever position sensor 15, for example.
- the electronic control unit 10 executes engagement control of the lock-up clutch of the torque converter 2 (Step S3).
- the electronic control unit 10 performs fastening control and slip control of a lockup clutch (not shown) in the torque converter 2 in accordance with the traveling state of the vehicle.
- the electronic control unit 10 executes a linear control process for a linear solenoid valve group (not shown) in the hydraulic control device 6 (step S4) and issues an output command to a shift solenoid valve group (not shown). Solenoid output command processing is executed (step S5).
- the electronic control unit 10 switches the oil passage in the hydraulic control device 6 by controlling the shift solenoid group and the linear solenoid group, and controls the engagement of the shift clutch in response to a shift-up or shift-down command.
- the electronic control unit 10 executes a line pressure and lubrication control process (step S7).
- the hydraulic control device 6 adjusts the basic hydraulic pressure supplied from the oil pump 61 by the regulator valve 62 based on the command of the electronic control unit 10 to generate the line pressure P, and according to the traveling state of the vehicle. Based on a command output from the electronic control unit 10, the line pressure P is switched between a high line pressure and a low line pressure by ON / OFF control of the solenoid valve 63. Further, the hydraulic control device 6 adjusts the supply amount of lubricating oil to various bearings, clutches, and the like by controlling opening and closing of control valves (relief valves and switching valves) provided on the lubricating oil passage side as necessary. .
- control valves relievef valves and switching valves
- the electronic control unit 10 executes a low line pressure region search / change process (map switching process in the second embodiment), which will be described later (step S8).
- the electronic control unit 10 executes a failure detection process for detecting the presence or absence of a failure of sensors and valves related to various controls in parallel with the series of hydraulic control processes (step S6). Exit.
- FIG. 9 is a flowchart showing the low line pressure region search / change process executed in step S8 of the flowchart of FIG.
- the electronic control unit 10 executes a subroutine of the low line pressure region search / change process.
- the region changing unit 102 acquires the temperature (oil temperature) TATF of the hydraulic oil detected by the ATF temperature sensor 18 (step S101). Then, the determination unit 103 of the region changing unit 102 determines whether or not the oil temperature TATF is 50 ° C. or lower (step S102), whether it is higher than 50 ° C. and lower than 80 ° C. (step S103), and from 80 ° C. It is sequentially determined whether or not it is 100 ° C. or less (step S104). The area changing unit 102 specifies areas 1 to 4 based on the determination result (steps S105 to S108). In the present embodiment, for example, the region 1 corresponds to the entire clutch capacity OK region (see FIG.
- region 2 corresponds to the mapped data at 80 ° C. described above.
- region 3 corresponds to the entire clutch capacity OK region (see FIG. 4) of the mapped data at 100 ° C. described above.
- the region 4 is not shown in the drawing, any region may be used as long as it has a clutch capacity OK region further reduced than the clutch capacity OK region (see FIG. 4) of the mapped data at 100 ° C.
- the area changing unit 102 reads the area of the mapped data currently designated by the electronic control unit 10 and stored in the storage unit 101 (step S109). Then, the determination unit 103 compares the newly specified area in steps S105 to S108 with the currently specified area, and determines whether or not the newly specified area is larger than the currently specified area. Determination is made (step S110).
- step S110 If it is determined that the newly specified area is larger than the currently specified area (“Yes” in step S110), it means that the temperature TATF of the hydraulic oil has transitioned to the low temperature side, and the state determination The unit 104 determines whether the throttle opening TH is fully closed or whether the line pressure P is currently a low line pressure (step S112).
- the region changing unit 102 permits the newly specified low line pressure region to be changed in the expansion direction, and changes the low line pressure region to the specific region (step S111). That is, the electronic control unit 10 stores (saves) the newly specified area in the storage unit 101 and ends the low line pressure area search / change process.
- step S112 when the state determination unit 104 determines that the throttle opening TH is not fully closed and the current line pressure is high, the region changing unit 102 prohibits the change, The designated area is maintained (step S113), and the electronic control unit 10 ends the low line pressure area search / change process.
- step S110 if it is determined that the newly specified area is smaller than the currently specified area (“No” in step S110), it means that the temperature TATF of the hydraulic oil has transitioned to the high temperature side. At this time, it is a change in the direction in which the low line pressure region shrinks, and although there is a region where the line pressure P is changed from the low line pressure to the high line pressure, the clutch slips due to the difference in torque capacity between the clutch and the engine 1. There is no problem. Therefore, the region changing unit 102 allows the newly specified low line pressure region to be changed in the expansion direction without making the determination in step S112 by the state determining unit 104, and the low line pressure region is changed to the specific region. Change (step S111). That is, the electronic control unit 10 stores (saves) the newly specified area in the storage unit 101 and ends the low line pressure area search / change process.
- the electronic control unit 10 includes a switching unit 102 instead of the area changing unit 102 illustrated in FIG. 2 in the first embodiment.
- This switching unit 102 is a case where the determination unit 103 determines that the temperature range is changing from the high temperature side to the low temperature side, and the throttle opening is fully closed or the line pressure P is the current low line pressure.
- the storage unit 101 stores a plurality of mapped data corresponding to the hydraulic oil temperature TATF as shown in FIGS. 4 and 5.
- the overall operation (AT control process) shown in the flowchart of FIG. FIG. 10 is a flowchart showing map switching processing according to the second embodiment of the present invention.
- the electronic control unit 10 executes this map switching process subroutine instead of the low line pressure region search / change process of the first embodiment. Execute.
- the switching unit 102 acquires the temperature (oil temperature) TATF N of the hydraulic oil detected by the ATF temperature sensor 18 (step S201). Then, the determination unit 103 of the switching unit 102 determines whether the oil temperature TATF N is 50 ° C. or lower (step S202), whether it is higher than 50 ° C. and lower than 80 ° C. (step S203), from 80 ° C. It is sequentially determined whether or not the temperature is 100 ° C. or lower (step S204). The switching unit 102 specifies the maps 1 to 4 based on the determination result (steps S205 to S208).
- map 1 corresponds to the above-described mapped data at 50 ° C.
- map 2 corresponds to the above-mentioned mapped data at 80 ° C.
- map 3 corresponds to the above-mentioned mapped data at 100 ° C.
- map 4 is not shown in the same manner as in the first embodiment, but may be a map having a clutch capacity OK region that is smaller than the clutch capacity OK region of the mapped data at 100 ° C.
- the switching unit 102 reads the oil temperature TATF O currently designated by the electronic control unit 10 and corresponding to the mapped data stored in the storage unit 101 (step S209). Then, the determination unit 103 determines whether the oil temperature TATF N corresponding to the mapped data newly specified in steps S205 to S208 is equal to or higher than the oil temperature TATF O when corresponding to the currently specified mapped data. Determination is made (step S210).
- step S210 When it is determined that the oil temperature TATF N is equal to or higher than the oil temperature TATF O (“Yes” in step S210), it means that the hydraulic oil temperature TATF has transitioned to the high temperature side, and the switching unit 102 The designated mapping data is switched to the mapping data specified in steps S205 to S208 (step S211), and the electronic control unit 10 ends this map switching process.
- step S210 if it is determined that the oil temperature TATF N is lower than the oil temperature TATF O (“No” in step S210), it means that the temperature TATF of the hydraulic oil has shifted to the low temperature side, and the state determination unit 104 Respectively determines whether the throttle opening TH is fully closed or whether the line pressure P is currently a low line pressure (step S212).
- the switching unit 102 determines from steps S205 to S208 based on the currently specified mapping data. Switching to the specified mapped data (step S211). Then, the electronic control unit 10 stores (saves) the newly specified mapped data in the storage unit 101 and ends this map switching process.
- step S212 when the throttle opening TH is not fully closed and the state determination unit 104 determines that the current line pressure is high, the switching unit 102 prohibits the switching and designates the current position.
- the electronic control unit 10 ends the map switching process while maintaining the map that has been set (step S213).
- the switching unit 102 of the electronic control unit 10 is adjusted to the hydraulic oil temperature TATF detected by the ATF temperature sensor 18. Based on this, the low line pressure region in the mapping data (hydraulic control characteristics) of the line pressure P stored in the storage unit 101 is changed to be enlarged. Therefore, by expanding the low line pressure region when the temperature TATF of the hydraulic oil is low, the friction torque of the entire transmission gear mechanism 3 can be reduced in the traveling state of the expanded region. Economic efficiency (fuel consumption) can be improved.
- the region changing unit 102 determines whether or not the mapped data has transitioned in the direction in which the low line pressure region is expanded, and the vehicle throttle opening TH is all set.
- a state determination unit 104 that determines whether the line pressure P is closed or the line pressure P is currently a low line pressure, and the determination unit 103 determines that the low line pressure region is transitioning in the expansion direction
- the state determination unit 104 determines that the throttle opening TH is fully closed or the line pressure P is currently low line pressure
- the region changing unit 102 moves in the direction of expanding the low line pressure region. This change is allowed, and otherwise the change is prohibited.
- the region change unit 102 performs the change without performing the determination by the state determination unit 104. Therefore, when there is no concern about clutch slip, the processing load of the electronic control unit 10 can be reduced and the low line pressure region in the mapped data can be expanded.
- the switching unit 102 of the electronic control unit 10 stores the hydraulic oil temperature TATF detected by the ATF temperature sensor 18.
- the plurality of mapped data stored in the unit 101 is switched as appropriate. Therefore, by switching to the mapped data in which the low line pressure region is expanded when the temperature TATF of the hydraulic oil is low, the friction torque of the entire transmission gear mechanism 3 can be reduced, so that the fuel economy of the vehicle ( (Fuel consumption) can be improved.
- the switching unit 102 determines whether or not the mapped data has transitioned in the direction in which the low line pressure region is expanded, and the throttle opening TH of the vehicle is fully closed. Or a state determination unit 104 that determines whether the line pressure P is currently a low line pressure, and the determination unit 103 determines that the low line pressure region is transitioning in the enlargement direction.
- the state determination unit 104 determines that the throttle opening TH is fully closed or the line pressure P is currently low line pressure
- the switching unit 102 permits switching of mapped data, In other cases, the switching is prohibited.
- the hydraulic circuit of the hydraulic control device 6 is not limited to the hydraulic circuit shown in FIG. 3, and the line pressure P can be switched in two stages of a high line pressure and a low line pressure. Any configuration (including types and combinations of valves) may be used.
- the present invention is applied to a line pressure control device for an automatic transmission that can switch the line pressure P between two stages of a high line pressure and a low line pressure. It is not limited to a line pressure control device that can switch such a line pressure P in two stages.
- the present invention may be applied to a line pressure control device that can switch the line pressure P in three stages of 6.0 kg / cm 2 , 7.5 kg / cm 2, and 9.5 kg / cm 2 .
- the region changing unit (or switching unit) 102 Change the hydraulic pressure control characteristics (mapped data) of the line pressure P in the direction of expanding the low line pressure region and the medium line pressure region when the throttle opening TH is fully closed or the line pressure P is currently low line pressure, or Switch.
- the determination unit 103 may determine whether or not the hydraulic control characteristic is shifted in the direction in which the medium line pressure region is expanded.
- the region changing unit 102 may determine whether to permit the change in the expansion direction of the low line pressure region or the medium line pressure region in consideration of the determination result.
Abstract
Description
図1は、本発明の第1実施形態における自動変速機のライン圧制御装置を備えた車両の動力伝達系統および制御系統を概略的に示すブロック図である。車両の動力伝達系統は、動力源であるエンジン1と、エンジン1の回転出力を変速ギア機構3に伝達するための流体継手であるトルクコンバータ2と、トルクコンバータ2の回転出力を入力して設定された速度比で変速して出力する変速ギア機構3と、変速ギア機構3の回転出力を左右の車輪(例えば後輪)5に分配するディファレンシャルギア機構4とを含む。トルクコンバータ2および変速ギア機構3に付属して油圧制御装置6が設けられている。この油圧制御装置6は、トルクコンバータ2および変速ギア機構3内に設けられている油圧制御型の複数の摩擦係合要素(クラッチなど)を所定の組み合わせで締結または解放させるものである。これにより、油圧制御装置6は、トルクコンバータ2のロックアップや、変速ギア機構3における入出力速度比を所要の変速段に設定することを行う。車両の自動変速機は、これらのトルクコンバータ2、変速ギア機構3、油圧制御装置6などによって構成される。また、本実施形態のライン圧制御装置は、油圧制御装置6と後述する電子制御ユニット10とによって構成される。
本発明の第2の実施形態における自動変速機のライン圧制御装置について説明する。ここでは、第1実施形態および第2実施形態に係る自動変速機のライン圧制御装置で異なる部分を詳細に説明し、同様の部分についてはその説明を省略する。本実施形態では、電子制御ユニット10は、第1実施形態における図2に示す領域変更部102の代わりに、切替部102を備えている。この切替部102は、温度領域の高温側から低温側に遷移していると判定部103が判定した場合であって、スロットル開度が全閉であるか、あるいはライン圧Pが現在低ライン圧であると状態判断部104が判断したときには、現在指定されているマップ化データ(記憶部101に格納されたもの)からATF温度センサ18により検出された作動油の油温TATFに基づいて特定されたマップ化データへの切り替えを許可する。一方、それ以外のときには、切替部102は当該切り替えを禁止する。また、記憶部101には、図4および図5に示すような作動油の温度TATFに対応して複数のマップ化データが格納されている。
Claims (5)
- 複数の摩擦係合要素からいずれかを選択して係合することによって所定の変速段を設定する車両用の自動変速機において、油圧源からの油圧を調圧することにより、前記摩擦係合要素を作動制御させるための作動油の基圧となるライン圧を制御する自動変速機のライン制御装置であって、
エンジン負荷に基づいて、高圧領域および低圧領域のいずれかに設定される前記ライン圧の油圧制御特性を格納する記憶部と、
前記作動油の温度を検出する作動油温度センサと、
前記作動油温度センサにより検出された前記作動油の温度に基づいて、前記記憶部に格納されている前記ライン圧の油圧制御特性における前記低圧領域を拡大するように変更する領域変更部と
を備えることを特徴とする自動変速機のライン圧制御装置。 - 前記領域変更部は、
前記低圧領域を拡大させる方向に前記油圧制御特性が遷移しているか否かを判定する判定部と、
前記車両のスロットル開度が全閉になっているか、あるいは前記ライン圧が現在低圧であるかをそれぞれ判断する状態判断部と
を備え、
前記低圧領域が拡大方向に遷移していると前記判定部が判定した場合であって、前記スロットル開度が全閉であるか、あるいは前記ライン圧が現在低圧であると前記状態判断部が判断したときには、前記領域変更部は、前記低圧領域の拡大方向への変更を許可し、それ以外のときには当該変更を禁止することを特徴とする請求項1に記載の自動変速機のライン圧制御装置。 - 前記領域変更部は、前記低圧領域を縮小させる方向に遷移していると前記判定部が判定した場合には、前記状態判断部による判断を行うことなく、当該変更を許可することを特徴とする請求項2に記載の自動変速機のライン圧制御装置。
- 複数の摩擦係合要素からいずれかを選択して係合することによって所定の変速段を設定する車両用の自動変速機において、油圧源からの油圧を調圧することにより、前記摩擦係合要素を作動制御させるための作動油の基圧となるライン圧を制御する自動変速機のライン制御装置であって、
エンジン負荷に基づいて、高圧領域および低圧領域のいずれかに設定される前記ライン圧の油圧制御特性を複数の温度領域に対応して複数格納する記憶部と、
前記作動油の温度を検出する作動油温度センサと、
前記作動油温度センサにより検出された前記作動油の温度に基づいて、前記記憶部に格納されている前記ライン圧の複数の油圧制御特性を切り替える切替部と
を備えることを特徴とする自動変速機のライン圧制御装置。 - 前記切替部は、
前記作動油の温度が前記複数の温度領域の高温側から低温側に遷移しているか否かを判定する判定部と、
前記車両のスロットル開度が全閉になっているか、あるいは前記ライン圧が現在低圧であるかをそれぞれ判断する状態判断部と
を備え、
前記作動油の温度が前記温度領域の高温側から低温側に遷移していると前記判定部が判定した場合であって、前記スロットル開度が全閉であるか、あるいは前記ライン圧が現在低圧であると前記状態判断部が判断したときには、前記切替部は、前記油圧制御特性の切り替えを許可し、それ以外のときには当該切り替えを禁止することを特徴とする請求項4に記載の自動変速機のライン圧制御装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US13/001,756 US8744706B2 (en) | 2008-07-04 | 2009-05-19 | Line pressure control device for automatic transmission |
CN200980123680.3A CN102066813B (zh) | 2008-07-04 | 2009-05-19 | 自动变速器的管路压力控制装置 |
EP09773243.2A EP2299146B1 (en) | 2008-07-04 | 2009-05-19 | Line pressure controller for automatic transmission |
JP2010518961A JP5369101B2 (ja) | 2008-07-04 | 2009-05-19 | 自動変速機のライン圧制御装置 |
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JP2008-176213 | 2008-07-04 | ||
JP2008176213 | 2008-07-04 |
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WO2010001665A1 true WO2010001665A1 (ja) | 2010-01-07 |
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US (1) | US8744706B2 (ja) |
EP (1) | EP2299146B1 (ja) |
JP (1) | JP5369101B2 (ja) |
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WO (1) | WO2010001665A1 (ja) |
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US20110112735A1 (en) * | 2008-04-07 | 2011-05-12 | Honda Motor Co. Ltd | Line pressure control device for automatic transmission |
US20130219874A1 (en) * | 2010-10-29 | 2013-08-29 | Mario Seebode | Hydraulic Arrangement |
JP2013174260A (ja) * | 2012-02-23 | 2013-09-05 | Aisin Aw Co Ltd | 変速機の制御装置および制御方法 |
CN103314240A (zh) * | 2011-02-01 | 2013-09-18 | 本田技研工业株式会社 | 自动变速器的液压控制装置 |
CN103380318A (zh) * | 2011-03-01 | 2013-10-30 | 本田技研工业株式会社 | 锁止离合器的控制装置 |
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JP7347365B2 (ja) * | 2020-08-06 | 2023-09-20 | トヨタ自動車株式会社 | 摩擦係合要素の熱負荷推定装置 |
KR20220059835A (ko) * | 2020-11-03 | 2022-05-10 | 현대두산인프라코어(주) | 건설 기계 및 이의 오토 아이들 제어 방법 |
KR20230026888A (ko) * | 2021-08-18 | 2023-02-27 | 현대자동차주식회사 | 차량의 변속기 유압 제어방법 |
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US20110112735A1 (en) * | 2008-04-07 | 2011-05-12 | Honda Motor Co. Ltd | Line pressure control device for automatic transmission |
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Also Published As
Publication number | Publication date |
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CN102066813A (zh) | 2011-05-18 |
US8744706B2 (en) | 2014-06-03 |
US20110112735A1 (en) | 2011-05-12 |
JP5369101B2 (ja) | 2013-12-18 |
CN102066813B (zh) | 2014-01-15 |
JPWO2010001665A1 (ja) | 2011-12-15 |
EP2299146B1 (en) | 2013-08-28 |
EP2299146A4 (en) | 2012-05-02 |
EP2299146A1 (en) | 2011-03-23 |
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