JP4611151B2 - Shift control device for automatic transmission - Google Patents

Description

  The present invention generally relates to a shift control device for an automatic transmission, and more particularly to a shift control device for an automatic transmission when a throttle valve is fully opened.

  In general, when the throttle valve is fully opened, it is necessary to determine the shift at a vehicle speed that does not result in a high-speed fuel cut, and to start the speed change. May be different. For example, when the engine water temperature is low and the high rotation valve timing is not permitted, the engine may be switched to a high rotation fuel cut with a low rotation valve timing.

  In such a case, if the shift determination when the throttle valve is fully opened is determined based on the vehicle speed in the automatic transmission (AT) side control, it is necessary to change the vehicle speed value according to the operating state of the engine. Therefore, when the throttle valve is fully opened, the fully opened shift is determined based on the high-speed fuel cut start rotation speed set by engine control.

  However, if this high-speed fuel cut start rotational speed is used as it is, the engine speed increases due to a change in the vehicle speed after the start of the shift, so that the fuel cut rotational speed can be reached during the shift and a high-speed fuel cut state can be established. There is sex. Therefore, in the prior art, the full-open gear shift is determined at an engine speed that is lower by a predetermined value than the high-speed fuel cut start rotation speed in anticipation of a change in vehicle speed after the start of the shift.

  In the conventional shift control method, the high-speed fuel cut start rotation speed set by the engine control is changed by the engine water temperature. The engine speed for hourly shifting is set.

  The change in the vehicle speed after the start of the shift depends on the responsiveness of the on-side clutch (engagement start clutch) in the upshift. This is because substantial shift is not started unless the capacity of the on-side clutch is generated. In other words, the vehicle speed increases until the capacity of the on-side clutch is generated. That is, the engine speed increases.

  Since the hydraulic response changes significantly depending on the ATF oil temperature (automatic fluid fluid oil temperature), the throttle valve has a certain margin to prevent high-speed fuel cut during shifting even at the lowest responsiveness at extremely low temperatures. It is necessary to set the speed of the shift engine when fully open.

  For this reason, even if the ATF oil temperature rises and the hydraulic response is ensured, the speed of the fully opened engine speed does not change with the rise of the oil temperature, so that the speed changes without using up the engine speed. There is.

  Therefore, an object of the present invention is to provide a shift control device for an automatic transmission that can prevent a high speed fuel cut from being entered during a shift regardless of the ATF oil temperature and that can fully utilize the engine characteristics. .

According to the present invention, there is provided a shift control device for an automatic transmission when the throttle valve is fully opened, the throttle opening detecting means for detecting the opening of the throttle valve, the engine water temperature detecting means for detecting the engine water temperature, and the automatic transmission. An oil temperature detecting means for detecting the oil temperature of the engine, a first full-open speed change engine speed set when the engine water temperature is equal to or lower than a first predetermined value, and a setting when the engine water temperature is higher than the first predetermined value. A third fully open speed change engine that is set when the second fully open speed change engine speed is greater than the first fully open speed change engine speed and the oil temperature of the automatic transmission is equal to or lower than a second predetermined value. Fully-opening speed change storing a rotational speed and a fourth fully-opening speed change engine speed greater than the third fully-opening speed change engine speed set when the oil temperature of the automatic transmission is higher than the second predetermined value D When the throttle valve fully open state is detected by the gin rotational speed storing means and the throttle opening degree detecting means, the first and second fully open speed change engine speeds according to the engine water temperature detected by the engine water temperature detecting means When the throttle valve fully open time is detected by the first selection means for selecting any one of the above and the throttle opening degree detection means, the third temperature is selected according to the oil temperature of the automatic transmission detected by the oil temperature detection means. And a second selection means for selecting one of the fourth fully opened speed change engine speed and a third selection means for selecting the smaller one of the fully opened speed change engine speed selected by the first and second selection means. a selection unit, a fully open shift control means for controlling to start the fully open shift when a gearchange engine speed fully opened selected in the third selection means, for detecting a failure of the oil temperature detecting means ; And a disabled detection means,
When a failure of the oil temperature detecting means is detected by the failure detecting means, the second selecting means selects the third fully opened speed change engine speed, and the third selecting means is the first selecting means. A smaller one of the selected full-open speed change engine speed and the third full-open speed change engine speed is selected, and the full-open speed change control means sets the full-open speed change engine speed selected by the third selection means. A shift control apparatus for an automatic transmission that controls to start a fully open shift based on the control.

According to a second aspect of the present invention, there is provided a shift control device for an automatic transmission when the throttle valve is fully opened, the engine including a valve timing switching mechanism for supplying driving force to the automatic transmission, and the throttle valve of the engine Throttle opening detecting means for detecting the opening of the engine, engine water temperature detecting means for detecting the engine water temperature of the engine, oil temperature detecting means for detecting the oil temperature of the automatic transmission, and the engine water temperature being a first predetermined value. As described above, the valve timing switching permission means for permitting switching of the valve timing switching mechanism, the first fully opened speed change engine speed set when the engine water temperature is equal to or lower than the first predetermined value, and the engine water temperature are A second fully open speed change engine speed greater than the first fully open speed change engine speed set when higher than a predetermined value; The third fully opened speed change engine speed set when the oil temperature of the speed gear is equal to or lower than the second predetermined value, and the third speed set when the oil temperature of the automatic transmission is higher than the second predetermined value. A full-open speed change engine speed storage means storing a fourth full-open speed change engine speed greater than the full-open speed change engine speed, and when the throttle valve fully open time is detected by the throttle opening detection means, the engine First selection means for selecting one of the first and second full-open speed shifting engine speeds according to the engine water temperature detected by the water temperature detection means, and when the throttle valve is fully opened is detected by the throttle opening degree detection means. And a second selection means for selecting one of the third and fourth full-open speed change engine speeds according to the oil temperature of the automatic transmission detected by the oil temperature detection means; And a third selection means for selecting a smaller one of the full-open speed change engine speeds selected by the second selection means, and a full-open speed change start at the full-open speed change engine speed selected by the third selection means. There is provided a shift control device for an automatic transmission , comprising a fully-open shift control means for controlling.

According to a third aspect of the invention, in the second aspect of the invention, the apparatus further comprises a failure detection means for detecting a failure of the oil temperature detection means, and the failure detection means detects a failure of the oil temperature detection means. A shift control device for an automatic transmission is provided , wherein the full-open shift control means controls to start a full-open shift based on the full-open shift engine speed selected by the first selection means. Is done.

According to the first aspect of the present invention, it is possible to prevent the high speed fuel cut from being entered during the shift regardless of the oil temperature condition of the automatic transmission, and to make full use of the engine characteristics. Further, when the oil temperature detecting means fails, it is based on the smaller one of the full-open speed change engine speed based on the engine water temperature and the third full-open speed change engine speed when the oil temperature of the automatic transmission is low. Therefore, even when the oil temperature detecting means fails, it is prevented from entering the high-rotation fuel cut during the shift, and smooth shift control can be performed.

According to a second aspect of the present invention, the engine is capable of changing the bubble timing, the engine water temperature at which the engine speed is changed by the engine water temperature is the same as the water temperature permitting the switching of the bubble timing mechanism, and the bubble timing is switched. Therefore, the engine speed can be utilized more effectively because the engine speed of the fully open shift engine is changed accordingly .

According to the third aspect of the present invention, when the oil temperature detecting means fails , control is performed so as to start the full-open shift based on the engine water temperature. Thus, smooth shift control can be performed.

  FIG. 1 shows a principle block diagram of the present invention. The throttle opening detection means 2 detects the opening of the throttle valve, and is composed of a throttle opening sensor and the like. The water temperature detecting means 4 detects the engine water temperature and is composed of a water temperature sensor or the like. The oil temperature detecting means 6 detects the oil temperature (ATF oil temperature) of the automatic transmission, and includes an oil temperature sensor or the like.

  The fully open speed change engine speed storage means 8 stores the speed change engine speed when the throttle valve is fully open according to the water temperature condition and the oil temperature condition. The full-open speed change engine speed storage means 8 is set when, for example, the first full-open speed change engine speed set when the engine water temperature is equal to or lower than a first predetermined value and the engine water temperature is higher than the first predetermined value. A second fully-open speed change engine speed greater than the first fully-open speed change engine speed is stored.

  The full-open speed change engine speed storage means 8 further includes a third full-open speed change engine speed set when the oil temperature of the automatic transmission is equal to or lower than a second predetermined value, and the oil temperature of the automatic transmission. A fourth fully-open speed-change engine speed that is larger than the third fully-open speed-change engine speed set when higher than a predetermined value is stored.

  When the throttle opening degree detection means 2 detects that the throttle valve is fully open, the first selection means 10 determines which of the first and second full-open speed change engine speeds according to the engine water temperature detected by the water temperature detection means 4. Select either one.

  When the throttle opening degree detecting means 2 detects that the throttle valve is fully open, the second selecting means 12 is a third and fourth full opening speed change according to the oil temperature of the automatic transmission detected by the oil temperature detecting means 6. Select one of the engine speeds.

  The third selection means 14 selects the smaller one of the full-open speed change engine speeds selected by the first and second selection means 10 and 12. Then, the full-open shift control means 16 performs control so that the full-open shift is started at the full-open speed change engine speed selected by the third selection means 14.

  The control method of the shift control device for the automatic transmission according to the embodiment of the present invention will be described below in detail based on the flowcharts of FIGS. FIG. 2 is a flowchart showing a main routine of the control method of the shift control device for the automatic transmission according to the embodiment of the present invention. First, a shift determination is executed in step S10. Details of this shift determination are shown in the flowchart of FIG.

  In step S20 of FIG. 3, it is determined whether or not the throttle valve has a high opening. That is, it is determined whether or not the throttle valve is fully opened. In the case of this embodiment, when the throttle valve is not less than a predetermined opening, it is determined that the throttle is fully open.

  If it is determined in step S20 that the throttle is fully open, the process proceeds to step S21, and the fully opened engine speed NE is changed according to the engine water temperature condition and the automatic transmission oil temperature (ATF oil temperature) condition.

  The change-over process of the full-open engine speed NE will be described in detail based on the flowchart of FIG. First, in step S30 of FIG. 4, it is determined whether or not the canceller has been filled.

  The oil charged in the canceller is an oil for removing the influence of the centrifugal force in the clutch at the time of high engine rotation, and the oil reservoir on the opposite side of the piston chamber of each clutch using the excess oil of the ATF. Fill with cancellation oil.

  When the canceller is filled, the centrifugal force of the hydraulic oil in the piston chamber is canceled by the centrifugal force of the canceller, so that the piston does not move in the clutch non-control state. Further, as described above, since the canceller uses surplus oil of the control ATF, it is not filled until a certain amount of time has elapsed after the engine is started after the engine is stopped and the oil in the hydraulic circuit is discharged. .

  If it is determined in step S30 that the canceller is not filled, the process proceeds to step S31, and the fully open shift engine speed NE stored in advance in a memory such as a ROM as canceller unfilled data is selected.

  In this case, the fully open speed change engine speed NE is set to 4500 rpm, for example. That is, when the canceller is not filled, the clutch that is in the non-controlled state at the time of high engine rotation may be operated by the centrifugal force of the oil, so that the centrifugal force is generated with a large margin from the high rotation fuel cut speed. Also, the fully open shift engine speed NE is set so that the clutch does not operate.

  If it is determined in step S30 that the canceller has been filled, the process proceeds to step S32 to determine whether the high valve timing is not permitted. That is, it is determined whether or not the engine high rotation valve timing is not permitted.

  The high valve timing permission condition includes parameters such as the engine water temperature and the elapsed time after the engine is started. For example, as the engine water temperature, the high valve timing permission condition is 60 ° C. or higher.

  If the determination in step S32 is affirmative, that is, if the high valve timing is not permitted, the process proceeds to step S33 to determine whether or not the engine water temperature is low. For example, it is determined that the engine water temperature is 60 ° C. or lower as a low temperature.

  If it is determined in step S33 that the engine water temperature is low, the process proceeds to step S34, and the full-open speed change engine speed NE at a low water temperature stored in advance in a memory such as a ROM is selected.

  If it is determined that the high bubble timing is not permitted and the engine water temperature is not low, the process proceeds to step S35, and the medium water temperature fully open shift engine speed NE stored in advance in a memory such as a ROM is selected.

  On the other hand, if it is determined in step S32 that the high valve timing is permitted, the process proceeds to step S36 to determine whether or not the engine water temperature is high. For example, when the engine water temperature is higher than 60 ° C., it is determined that the temperature is high.

  Therefore, when the high valve timing is permitted, the engine water temperature is almost determined to be high in step S36, and the process proceeds to step S37, where the fully open shift at the high water temperature is stored in advance in a memory such as a ROM. Select the engine speed NE.

  At the time of the 1-2 shift, for example, the fully open shift NE at a low water temperature is 5800 rpm, the intermediate water temperature is 5800 rpm, and the high water temperature is 6100 rpm. Further, at the time of 2-3 shifts, the fully open shift NE at low water temperature is 6300 rpm, 6300 rpm at medium water temperature, and 6500 rpm at high water temperature. Similarly, the data of the full opening speed NE at the time of the 3-4 shift and the 4-5 shift are also set in the memory.

  When the fully open shift engine speed NE is selected in steps S34, S35, and S37, the process proceeds to step S38 to determine whether or not the oil temperature sensor is malfunctioning. If it is determined that the oil temperature sensor has not failed, the process proceeds to step S39 to determine whether or not the ATF oil temperature is low.

  For example, when the temperature is 30 ° C. or lower, the ATF oil temperature is determined to be low. If it is determined in step S39 that the ATF oil temperature is low, the process proceeds to step S40, and the fully open speed change engine speed NE at a low oil temperature stored in advance in a memory such as a ROM is selected.

  If it is determined in step S39 that the ATF oil temperature is not low, the process proceeds to step S41 to determine whether or not the ATF oil temperature is high. For example, when the ATF oil temperature is higher than 60 ° C., it is determined that the temperature is high.

  If it is determined in step S41 that the ATF oil temperature is not high, the process proceeds to step S42, and the fully open speed change engine speed NE at the medium oil temperature stored in advance in a memory such as a ROM is selected.

  If it is determined in step S41 that the ATF oil temperature is high, the process proceeds to step S43, and the fully open speed engine speed NE at a high oil temperature stored in advance in a memory such as a ROM is selected.

  At the time of the 1-2 shift, for example, the full open speed change engine speed NE at low oil temperature is 6000 rpm, the full open speed NE at medium oil temperature is 6050 rpm, and the full open speed NE at high oil temperature is 6100 rpm.

  At the time of 2-3 shifting, for example, the full opening speed change engine speed NE at low oil temperature is 6350 rpm, the full opening speed change NE at medium oil temperature is 6400 rpm, and the full opening speed change NE at high oil temperature is 6450. Similarly, the fully open shift engine speed NE at the time of the 3-4 shift and the 4-5 shift is also preset in the memory for each of the low oil temperature, the medium oil temperature, and the high oil temperature.

  When the fully open speed change engine speed NE is selected in steps S40, S42, and S43, the process proceeds to step S44, and the fully open speed change engine speed NE based on the engine water temperature selected in steps S34, S35, and S37, and steps S40, S42, and S43. The smaller one of the full-open shift engine speed NE based on the ATF oil temperature selected in step S5 is selected.

  If it is determined in step S38 that the oil temperature sensor has failed, the process proceeds to step S45, where the change of the full-open gear shift NE based on the ATF oil temperature is prohibited, and the full-open gear shift based on the engine water temperature selected in steps S34, S35, S37. The engine speed NE is adopted.

  After selecting the fully open shift engine speed NE in this way, the process returns to step S22 in the flowchart of FIG. 3 to determine whether or not the current engine speed NE is greater than the fully open shift engine speed NE.

  If step S22 is affirmative, the process proceeds to step S23 to make an upshift determination. If the determination in step S22 is negative, that is, if it is determined that the current engine speed NE is less than or equal to the fully open shift engine speed NE, the process proceeds to step S24 and a shift map is searched.

  This shift map is used to determine upshift or downshift based on the vehicle speed and the throttle opening. Since this shift map is well known in the field of shift control for automatic transmissions, its description is omitted.

  After searching the shift map, the process proceeds to step S25, and it is determined whether or not the current shift stage SH is smaller than the shift stage (shift stage) searched in the shift map. If the determination in step S25 is affirmative, the process proceeds to step S23 to perform an upshift determination.

  On the other hand, when step S25 is negative determination, it progresses to step S26 and it is determined whether the present shift stage SH is larger than the shift stage searched by the shift map. If the determination is affirmative, the process proceeds to step S27 to make a downshift determination. If the determination is negative, the current shift stage SH is maintained.

  When the shift determination is completed in this way, the process returns to step S11 of the flowchart shown in FIG. 2 to determine whether there is a shift. When there is no shift, the current shift stage SH is maintained.

  If it is determined in step S11 that there is no shift, the current shift stage is maintained, and if it is determined that there is a shift, the process proceeds to step S12 to determine whether an upshift is performed.

  If it is determined that the shift is an upshift, the process proceeds to step S13 to execute the upshift control. On the other hand, if it is determined in step S12 that the shift is not an upshift, the process proceeds to step S14 and downshift control is executed.

  As described above, in the control method of the speed change control device of the present embodiment, based on the smaller one of the full-open shift engine speed NE based on the engine water temperature condition and the full-open shift engine speed NE based on the ATF oil temperature condition, Since control is performed so as to start a fully open shift, it is possible to reliably prevent a high speed fuel cut from being entered during the shift, and it is possible to prevent shifting without using up the engine speed as in the past. It is possible to make full use of the characteristics.

  FIG. 5 is a flowchart showing another embodiment of the present invention when the oil temperature sensor fails. In this embodiment, if step S45 is omitted and it is determined in step S38 that the oil temperature sensor is out of order, the process proceeds to step S40, and the fully open speed change engine speed NE at a low oil temperature is selected.

  In step S44, the smaller one of the full opening speed change engine speed NE based on the engine water temperature and the full opening speed change engine speed NE at the time of low oil temperature is selected. After selecting the fully open shift engine speed NE in this way, the process returns to step S22 in the flowchart of FIG. 3 to execute the above-described steps.

  Next, changes in the engine water temperature and the ATF oil temperature according to the elapsed time after the engine start will be described with reference to FIG. As is clear from FIG. 6A, the increase in the ATF oil temperature is slower than the increase in the engine water temperature after the engine is started. The engine water temperature is indicated by a solid line, and the ATF oil temperature is indicated by a broken line.

  Since the engine water temperature is the engine cooling water temperature, it quickly rises when the engine starts and warms up, but the ATF oil temperature rises due to the stirring resistance of gears and the like provided in the automatic transmission. Compared to the rise, the rise is slow.

  Therefore, at the time of (1) immediately after the engine is started, the engine water temperature and the ATF oil temperature are low, and at the time of (3) when a certain amount of time has passed, the engine water temperature is relatively high, but the ATF oil temperature is not so high. It has not risen. At a time point (4) when a sufficient time has elapsed after the engine is started, both the engine water temperature and the ATF oil temperature are high. The table in FIG. 6B roughly corresponds to the graph in FIG.

  Therefore, the engine water temperature has risen sufficiently high until some time has elapsed after the engine is started, but the ATF oil temperature may be in a low temperature or medium temperature state. In such a case, control is performed so as to start the full opening shift based on the low oil temperature full opening speed change engine speed NE or the middle oil temperature full opening speed change engine speed NE.

It is a block diagram which shows the principle of this invention. It is a flowchart which shows the main routine of this invention embodiment. It is a flowchart which shows a shift judgment process. It is a flowchart which shows a fully open NE change-over process. It is a flowchart which shows other embodiment of the full open NE change-over process at the time of an oil temperature sensor failure. FIG. 6A is a graph showing the relationship between the elapsed time after engine start, the engine water temperature, and the ATF oil temperature, and FIG. 6B shows this relationship in a table.

Explanation of symbols

2 Throttle opening detection means 4 Water temperature detection means 6 Oil temperature detection means 8 Fully open speed change engine speed storage means 10 First selection means 12 Second selection means 14 Third selection means 16 Fully open speed change control means

Claims (3)

A shift control device for an automatic transmission when the throttle valve is fully open,
Throttle opening detection means for detecting the opening of the throttle valve;
Engine water temperature detecting means for detecting the engine water temperature;
Oil temperature detecting means for detecting the oil temperature of the automatic transmission;
The first full-open speed change engine speed set when the engine water temperature is equal to or lower than the first predetermined value and the first full-open speed change engine speed set when the engine water temperature is higher than the first predetermined value. The larger second full-open speed change engine speed, the third full-open speed change engine speed set when the oil temperature of the automatic transmission is equal to or lower than the second predetermined value, and the oil temperature of the automatic transmission are A full-open speed change engine speed storage means for storing a fourth full-open speed change engine speed greater than the third full-open speed change engine speed set when higher than a second predetermined value;
When the throttle opening degree detecting means detects that the throttle valve is fully open, one of the first and second full opening speed changing engine speeds is selected according to the engine water temperature detected by the engine water temperature detecting means. First selection means;
When the throttle valve opening detecting means detects that the throttle valve is fully open, one of the third and fourth fully opened speed changing engine speeds according to the oil temperature of the automatic transmission detected by the oil temperature detecting means. A second selection means for selecting one;
Third selection means for selecting the smaller one of the full-open speed change engine speeds selected by the first and second selection means;
A fully open shift control means for controlling to start a fully open shift at the fully open shift engine speed selected by the third selecting means;
A failure detection means for detecting a failure of the oil temperature detection means,
When a failure of the oil temperature detecting means is detected by the failure detecting means, the second selecting means selects the third fully opened speed change engine speed, and the third selecting means is the first selecting means. Select the smaller one of the selected full-open speed change engine speed and the third full-open speed change engine speed,
The fully open shift control means controls to start a fully open shift based on the fully open shift engine speed selected by the third selection means . A shift control device for an automatic transmission when the throttle valve is fully open,
An engine having a valve timing switching mechanism for supplying driving force to the automatic transmission;
Throttle opening detecting means for detecting the opening of the throttle valve of the engine;
Engine water temperature detecting means for detecting the engine water temperature of the engine;
Oil temperature detecting means for detecting the oil temperature of the automatic transmission;
Valve timing switching permission means for permitting switching of the valve timing switching mechanism when the engine water temperature is equal to or higher than a first predetermined value;
The first full-open speed change engine speed set when the engine water temperature is equal to or lower than the first predetermined value and the first full-open speed change engine speed set when the engine water temperature is higher than the first predetermined value. A second fully opened transmission engine speed greater than the number, a third fully opened transmission engine speed set when the oil temperature of the automatic transmission is equal to or lower than a second predetermined value, and the oil temperature of the automatic transmission. A full-open speed change engine speed storage means for storing a fourth full-open speed change engine speed greater than the third full-open speed change engine speed set when higher than the second predetermined value;
When the throttle opening degree detecting means detects that the throttle valve is fully open, one of the first and second full opening speed changing engine speeds is selected according to the engine water temperature detected by the engine water temperature detecting means. First selection means;
When the throttle valve opening detecting means detects that the throttle valve is fully open, one of the third and fourth fully opened speed changing engine speeds according to the oil temperature of the automatic transmission detected by the oil temperature detecting means. A second selection means for selecting one;
Third selection means for selecting the smaller one of the full-open speed change engine speed selected by the first and second selection means;
A fully open shift control means for controlling to start a fully open shift at the fully open shift engine speed selected by the third selecting means;
A shift control device for an automatic transmission , comprising: It further comprises failure detection means for detecting a failure of the oil temperature detection means,
When the failure detection means detects a failure of the oil temperature detection means, the full-open shift control means is controlled to start a full-open shift based on the full-open shift engine speed selected by the first selection means. The shift control device for an automatic transmission according to claim 2, wherein:

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