JP2012211661A - Automatic transmission, and method for controlling the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic transmission and a method for controlling the same, capable of more properly coping with a shift instruction to the other gear shift stage when the shift instruction is issued before upshift instruction of the transmission which has been issued is completed.SOLUTION: When the second upshift instruction is issued before the first upshift instruction of the automatic transmission which has been issued is completed (S200 and S210), the second upshift is allowed to be carried out in case the second upshift instruction is issued before torque down of the engine is started by an engine ECU based on the torque down instruction, and in case the second upshift instruction is issued after the torque down of the engine is started by the engine ECU based on the torque down instruction, the second upshift is, in principle, prohibited from being executed (S220 and S260).

Description

  The present invention relates to an automatic transmission and a control method thereof.

  Conventionally, this type of automatic transmission includes an automatic transmission having an input shaft connected to an engine and having reverse and forward 1st to 5th gears. 1 → 2 speed change (shift from 1st speed to 2nd speed) ), When the 2 → 3 shift (shift from 2nd to 3rd) is determined before the start of the inertia phase (before the start of engine speed reduction), the 1 → 2 shift is stopped and 1 → When 3 shifts (shift from 1st speed to 3rd speed) are performed and 2 → 3 shift determination is made after the start of the inertia phase, 2 → 3 shift is prohibited and 1 → 2 shift is continued and after the end There has been proposed one that cancels the prohibition of 2 → 3 shift and performs 2 → 3 shift (see, for example, Patent Document 1).

JP-A-6-346959

  In recent years, in such an automatic transmission, in order to shorten the time required for changing the shift stage of the automatic transmission and to suppress a shift shock, the automatic transmission is changed while changing the output torque of the engine by an electronic control unit for the engine. It is considered to change the gear position. In this case, when the 2 → 3 shift determination is performed before the start of the inertia phase, the 1 → 3 shift is permitted as in the above-described automatic transmission, and the 2 → 3 shift determination is performed. Depending on the degree of change in the output torque of the engine, there is a possibility that the engine output torque cannot be properly changed for the 1 → 3 shift, and a shift shock may occur. For this reason, it becomes a problem to which timing to allow 1 → 3 shift.

  The automatic transmission apparatus and the control method thereof according to the present invention cope more appropriately when an instruction to change to another gear stage is given before an upshift is completed after an upshift instruction is given to the transmission. The main purpose.

  The automatic transmission and the control method thereof according to the present invention employ the following means in order to achieve the above-described main object.

The automatic transmission of the present invention is
A stepped transmission that transmits power input from the power source to the input shaft to the output shaft while changing the shift stage, and the shift stage is changed when an instruction to change the shift stage of the transmission is given. Transmission control means for controlling the transmission, and reduction instruction means for outputting an instruction to lower the output torque of the power source to the power source control means for controlling the power source when the change instruction is an upshift instruction. An automatic transmission comprising:
Before an upshift to the first shift stage is completed after an upshift instruction to the first shift stage of the transmission is made, a decrease in the output torque of the power source in response to the decrease instruction starts. When an instruction to change to the second gear stage different from the first gear stage is given before the change, the change to the second gear stage is permitted, and the output torque of the power source in response to the lowering instruction Second change permission prohibiting means for prohibiting the change to the second shift stage when an instruction to change to the second shift stage is issued after the start of the decrease of
It is a summary to provide.

  In the automatic transmission device according to the present invention, the transmission is controlled to change the gear position when an instruction to change the gear position of the transmission is given, and the output torque of the power source is reduced when the change instruction is an upshift instruction. In the output of the instruction to the power source control means for controlling the power source, the reduction occurs before the upshift to the first shift stage is completed after the upshift instruction to the first shift stage of the transmission is made. When a change instruction to the second shift stage different from the first shift stage is given before the reduction of the output torque of the power source according to the instruction starts, the change to the second shift stage is permitted and the decrease When an instruction to change to the second shift stage is issued after the output torque of the power source according to the instruction starts decreasing, the change to the second shift stage is prohibited. Thereby, in the former case, the change (upshift) of the shift stage of the transmission to the first shift stage can be stopped and changed to the second shift stage. In the latter case, the change to the first shift stage is continued regardless of the instruction to change the shift stage of the transmission to the second shift stage, and the output torque of the power source by the power source control means is reduced. It is possible to suppress inconveniences due to the fact that the change cannot be appropriately performed due to the change to the second shift stage, for example, the occurrence of a shift shock. As a result, when a change instruction to the second shift stage is given before the upshift is completed after the upshift instruction to the first shift stage of the transmission is made, a more appropriate countermeasure is taken. Can do. Here, the “instruction to change to the second gear” may be an upshift instruction or a downshift instruction due to an increase in torque to be output to the output shaft of the transmission.

  In such an automatic transmission according to the present invention, when the change instruction is an upshift instruction, the decrease instruction means reduces the output torque of the power source so that the output torque of the power source starts to decrease before the rotation speed of the power source starts to decrease. The second change permission prohibiting unit is a unit that outputs an instruction, and the second change permission prohibiting unit is configured to issue an instruction to change to the second shift stage after a decrease in output torque of the power source in response to the decrease instruction is started. When the instruction to change to the second gear is instructed, when the degree of decrease in the output torque of the power source is less than a threshold value determined within a range where the rotational speed of the power source does not decrease, the second speed change is performed. It can also be a means for allowing changes to the stage. This is because even if the output torque of the power source starts to decrease, if the output torque decrease of the power source is relatively small (including a value of 0), the power source output change or rotation change by the power source control means is reduced. This is based on the reason that there is a high possibility that the change to the second shift stage can be appropriately performed and that the shift shock can be suppressed. By so doing, it is possible to expand the range in which the change of the shift stage of the transmission to the second shift stage is permitted.

  In the automatic transmission according to the present invention, when a decrease in the output torque of the power source in response to the decrease instruction starts, a predetermined time has elapsed after the decrease instruction is output to the power source control means. It can also be.

  Further, in the automatic transmission apparatus according to the present invention, the second change permission prohibiting means prohibits the change to the second shift stage when an instruction to change to the second shift stage is issued. It may be a means for permitting the change to the second gear after the upshift to the first gear is completed.

  In addition, in the automatic transmission apparatus of the present invention, the lowering instruction unit may be a unit that outputs the lowering instruction when an upshift of the transmission is instructed by a shift operation by an operator. it can.

The control method of the automatic transmission according to the present invention includes:
A stepped transmission for transmitting power input from the power source to the input shaft to the output shaft while changing the shift stage, so that the shift stage is changed when an instruction to change the shift stage of the transmission is given. A control method for an automatic transmission that controls the transmission and outputs an instruction to lower the output torque of the power source to power source control means for controlling the power source when the change instruction is an upshift instruction,
Before an upshift to the first shift stage is completed after an upshift instruction to the first shift stage of the transmission is made, a decrease in the output torque of the power source in response to the decrease instruction starts. When an instruction to change to the second gear stage different from the first gear stage is given before the change, the change to the second gear stage is permitted, and the output torque of the power source in response to the lowering instruction When a change instruction to the second shift stage is issued after the start of the decrease of the second shift stage, the change to the second shift stage is prohibited.
It is characterized by that.

  In the control method for the automatic transmission according to the present invention, the transmission is controlled to change the gear position when an instruction to change the gear position of the transmission is given, and the output of the power source is output when the change instruction is an upshift instruction. In the output of the torque reduction instruction to the power source control means for controlling the power source, the upshift to the first shift stage is completed after the upshift instruction to the first shift stage of the transmission is given. When the change instruction to the second shift stage different from the first shift stage is issued before the decrease of the output torque of the power source according to the decrease instruction starts, the change to the second shift stage is permitted. Then, when a change instruction to the second shift stage is issued after the output torque of the power source according to the decrease instruction starts to be reduced, the change to the second shift stage is prohibited. Thereby, in the former case, the change (upshift) of the shift stage of the transmission to the first shift stage can be stopped and changed to the second shift stage. In the latter case, the change to the first shift stage is continued regardless of the instruction to change the shift stage of the transmission to the second shift stage, and the output torque of the power source by the power source control means is reduced. It is possible to suppress inconveniences due to the fact that the change cannot be appropriately performed due to the change to the second shift stage, for example, the occurrence of a shift shock. As a result, when a change instruction to the second shift stage is given before the upshift is completed after the upshift instruction to the first shift stage of the transmission is made, a more appropriate countermeasure is taken. Can do. Here, the “instruction to change to the second gear” may be an upshift instruction or a downshift instruction due to an increase in torque to be output to the output shaft of the transmission.

It is a block diagram which shows the outline of a structure of the motor vehicle 10 carrying the automatic transmission 20 as one Example of this invention. 1 is a configuration diagram showing an outline of a mechanical configuration of an automatic transmission 20. FIG. 3 is an explanatory diagram showing an operation table showing the relationship between each gear position of the automatic transmission 30 and the operation states of clutches C-1 to C-3 and brakes B-1 and B-2. 3 is an explanatory diagram illustrating a collinear diagram illustrating the relationship between rotational speeds between rotating elements constituting the automatic transmission 30. FIG. 2 is a configuration diagram of a part of a hydraulic circuit 50. FIG. 5 is a flowchart showing an example of a manual shift control routine executed by a transmission ECU 80. FIG. 4 is an explanatory diagram showing an example of a change in time of the output torque of the engine 12 when the automatic transmission 30 is upshifted, the rotational speed of the input shaft 31, and the hydraulic pressure with respect to the engagement side element. 6 is a flowchart showing an example of a second upshift permission prohibition routine executed by transmission ECU80. Until the first upshift is completed, when the torque down amount ΔTe of the engine 12 is less than the threshold value ΔTeref, the torque of the engine 12 when the second upshift is instructed, the rotational speed of the input shaft 31, the first engagement side It is explanatory drawing which shows an example of the mode of a time change of a hydraulic pressure and a 2nd engagement side hydraulic pressure.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a configuration diagram showing an outline of a configuration of an automobile 10 equipped with an automatic transmission 20 as an embodiment of the present invention, and FIG. 2 is a configuration diagram showing an outline of a mechanical configuration of the automatic transmission 20. It is. As shown in FIGS. 1 and 2, an automobile 10 according to the embodiment includes an engine 12 as an internal combustion engine that outputs power by explosion combustion of hydrocarbon fuel such as gasoline and light oil, and an engine that controls the operation of the engine 12. Electronic control unit (hereinafter referred to as engine ECU) 16, fluid transmission device 22 attached to crankshaft 14 of engine 12, input shaft 31 is connected to the output side of fluid transmission device 22, and gear mechanism 48. And an output shaft 32 connected to the drive wheels 11a and 11b via the differential gear 49, a stepped automatic transmission 30 for shifting the power input to the input shaft 31 and transmitting it to the output shaft 32, and the fluid transmission device 22. And hydraulic circuit 50 for supplying and discharging hydraulic oil to and from automatic transmission 30, and by controlling hydraulic circuit 50, fluid transmission device 22 and automatic transmission 30 Control for transmission electronic control unit (hereinafter, transmission of ECU) includes a 80, a brake electronic control unit for controlling the electronically controlled hydraulic brake unit, not shown (hereinafter, the brake referred ECU) 17, a. Here, the automatic transmission 20 of the embodiment mainly corresponds to the automatic transmission 30, the hydraulic circuit 50, and the transmission ECU 80.

  The engine ECU 16 is configured as a microprocessor centered on a CPU, and includes a ROM that stores a processing program, a RAM that temporarily stores data, an input / output port, and a communication port in addition to the CPU. The engine ECU 16 includes signals from various sensors for detecting the operating state of the engine 12 such as an engine rotational speed Ne from a rotational speed sensor 14 a attached to the crankshaft 14 and an accelerator opening Acc as an amount of depression of the accelerator pedal 93. Signals such as the accelerator opening Acc from the accelerator pedal position sensor 94 to be detected and the vehicle speed V from the vehicle speed sensor 98 are input via the input port, and the engine ECU 16 drives the throttle motor that drives the throttle valve. A signal, a control signal to the fuel injection valve, an ignition signal to the spark plug, and the like are output via the output port.

  As shown in FIG. 2, the fluid transmission device 22 is configured as a fluid torque converter with a lock-up clutch, and serves as an input-side fluid transmission element connected to the crankshaft 14 of the engine 12 via the front cover 18. Of the pump impeller 23, a turbine runner 24 as an output side fluid transmission element connected to the input shaft 31 of the automatic transmission 30 via a turbine hub, and the turbine runner disposed inside the pump impeller 23 and the turbine runner 24. The stator 25 which rectifies | straightens the flow of the hydraulic oil from 24 to the pump impeller 23, the one-way clutch 26 which restrict | limits the rotation direction of the stator 25 to one direction, and the lockup clutch 28 which has a damper mechanism are provided. When the difference in rotational speed between the pump impeller 23 and the turbine runner 24 is large, the fluid transmission device 22 functions as a torque amplifier by the action of the stator 25, and the difference in rotational speed between the pump impeller 23 and the turbine runner 24 is small. Sometimes it functions as a fluid coupling. The lock-up clutch 28 can execute lock-up and release of lock-up for connecting the pump impeller 23 (front cover 18) and the turbine runner 24 (turbine hub). When the up-on condition is satisfied, the pump impeller 23 and the turbine runner 24 are locked up by the lock-up clutch 28, and the power from the engine 12 is mechanically and directly transmitted to the input shaft 31. At this time, the fluctuation of the torque transmitted to the input shaft 31 is absorbed by the damper mechanism.

  The automatic transmission 30 is configured as a stepped transmission with six speeds, and includes a single pinion planetary gear mechanism 35, a Ravigneaux planetary gear mechanism 40, and three clutches C-1, C-2, C-. 3 and two brakes B-1, B-2 and a one-way clutch F-1. The single pinion type planetary gear mechanism 35 includes a sun gear 36 as an external gear, a ring gear 37 as an internal gear disposed concentrically with the sun gear 36, and a plurality of gears meshed with the sun gear 36 and meshed with the ring gear 37. The pinion gear 38 and a carrier 39 that holds the plurality of pinion gears 38 so as to rotate and revolve freely. The sun gear 36 is fixed to the case, and the ring gear 37 is connected to the input shaft 31. The Ravigneaux planetary gear mechanism 40 includes two sun gears 41a and 41b as external gears, a ring gear 42 as an internal gear, a plurality of short pinion gears 43a meshing with the sun gear 41a, a sun gear 41b and a plurality of short pinion gears 43a. The sun gear 41a includes a plurality of long pinion gears 43b that mesh with the ring gear 42 and a carrier 44 that holds the plurality of short pinion gears 43a and the plurality of long pinion gears 43b so as to rotate and revolve. 1 is connected to the carrier 39 of the single-pinion type planetary gear mechanism 35, the sun gear 41b is connected to the carrier 39 via the clutch C-3, and is connected to the case via the brake B-1, and the ring gear 42 Is connected to the output shaft 32 and A 44 is connected to the input shaft 31 via the clutch C-2. The carrier 44 is connected to the case via the brake B2 and to the case via the one-way clutch F-1. FIG. 3 shows an operation table showing the relationship between the respective speeds of the automatic transmission 30 and the operating states of the clutches C-1 to C-3 and the brakes B-1 and B-2, and FIG. The collinear diagram which illustrates the relationship of the rotational speed between the rotation elements which comprise is shown. As shown in the operation table of FIG. 3, the automatic transmission 30 is turned on / off of the clutches C-1 to C-3 (on is engaged and off is released) and the brakes B-1 and B-2 are turned on / off. Can be switched between forward 1st to 6th, reverse and neutral.

  The clutches C-1 to C-3 and the brakes B-1 and B-2 of the automatic transmission 30 are operated by a hydraulic circuit 50 that is driven and controlled by the transmission ECU 80. FIG. 5 is a configuration diagram of a part of the hydraulic circuit 50. The hydraulic circuit 50 includes a mechanical oil pump 52 that pumps hydraulic oil using power from the engine 12, and a regulator valve 54 that adjusts the pressure (line pressure PL) of the hydraulic oil pumped by the mechanical oil pump 52, A linear solenoid 55 that drives the regulator valve 54, a linear solenoid SLC1 that inputs and regulates the line pressure PL via the manual valve 56, and outputs the pressure to the clutch C-1 side. And a linear solenoid SLB1 that adjusts the pressure and outputs the pressure to the brake B-1 side. In FIG. 5, only the hydraulic system of the clutch C-1 and the brake B-1 is shown, but the other clutches C-2, C-3 and the brake B-2 are also configured by the same hydraulic system. Can do.

  The transmission ECU 80 is configured as a microprocessor centered on a CPU, and includes a ROM that stores a processing program, a RAM that temporarily stores data, an input / output port, and a communication port in addition to the CPU. . The transmission ECU 80 includes signals from various sensors for detecting the operating state of the engine 12, such as an engine rotational speed Ne from a rotational speed sensor 14a attached to the crankshaft 14, and a rotational speed sensor attached to the input shaft 31. The input shaft rotational speed Nin from 31a, the output shaft rotational speed Nout from the rotational speed sensor 32a attached to the output shaft 32, the shift position SP from the shift position sensor 92 that detects the position of the shift lever 91, and the accelerator pedal position The accelerator opening Acc from the sensor 94, the brake pedal position BP from the brake pedal position sensor 96 for detecting the depression amount of the brake pedal 95, the vehicle speed V from the vehicle speed sensor 98, and the like are input via the input port, From the machine ECU 80, oil A control signal to the circuit 50 is output via the output port.

  The engine ECU 16, the brake ECU 17, and the transmission ECU 80 are connected to each other via a communication port, and exchange various control signals and data necessary for control with each other. Further, as the shift position SP of the shift lever 91, in the embodiment, a parking position (P position) used during parking, a reverse position (R position) for reverse travel, a neutral position (N position), and a forward travel position are used. In addition to a normal drive position (D position), an upshift instruction position for instructing an upshift and a downshift instruction position for instructing a downshift to change the gear position of the automatic transmission 30 by shifting from the drive position Is prepared. Hereinafter, the shift mode based on the drive position or the reverse position is referred to as a normal shift mode, and the shift mode based on the upshift instruction position or the downshift instruction position is referred to as a manual shift mode.

  Next, the operation of the automatic transmission 20 of the embodiment configured as described above, particularly, the operation when the automatic transmission 30 is upshifted in the manual transmission mode will be described. FIG. 6 is a flowchart illustrating an example of a manual shift control routine executed by the transmission ECU 80. This routine is executed when an upshift of the automatic transmission 30 is instructed in the manual shift mode. Hereinafter, in the description of this routine, the first forward speed (the clutch C-1 is on and the clutches C-2 and C-3 and the brakes B-1 and B-2 are off and the one-way clutch F1 is activated) to the second forward speed ( The case where the upshift to the clutch C-1 and the brake B-1 is ON and the clutch C-2, C-3 and the brake B-2 are OFF) (when the brake B-1 is ON) will be described as an example. To do.

  When the manual shift control routine is executed, first, the transmission ECU 80 first engages the clutch C-1 to C-3, the brakes B-1 and B-2 with the upshift. In addition to starting execution of fast fill control for rapidly filling hydraulic oil to close the gap between the piston and the friction plate (not shown) of the element (step S100), the output torque of the engine 12 is reduced (hereinafter referred to as torque down). A torque down instruction as an instruction is output (transmitted) to engine ECU 16 (step S110).

  Here, the fast fill control is performed by driving an engagement-side linear solenoid that is a linear solenoid corresponding to the engagement-side element at a relatively high duty ratio so that hydraulic fluid is supplied to the engagement-side element. . For example, when an upshift from the first forward speed to the second forward speed is performed, the linear solenoid SLB1 is driven so that hydraulic fluid is supplied to the brake B-1 side. When there is an open side element that should be released with an upshift among the clutches C-1 to C-3 and the brakes B-1 and B-2, the hydraulic pressure acting on the open element is drained. Drain processing is also performed. The completion of the execution of the fast fill control can be made when a predetermined time determined by an experiment or an analysis as a time required for the execution of the fast fill control has elapsed since the start of the execution of the fast fill control.

  The torque-down instruction is an instruction for causing the engine ECU 16 to reduce the torque of the engine 12 from a timing after the predetermined time ted1 has elapsed since the reception (hereinafter referred to as a first predetermined timing). In the embodiment, the torque reduction amount ΔTe of the engine 12 is a value 0 until the first predetermined timing after the engine ECU 16 receives the torque down instruction, and the timing after the predetermined time ted2 has elapsed from the first predetermined timing (hereinafter, referred to as the following). Until the second predetermined timing), the torque-down amount ΔTe increases at a constant rate value Rd, and after the second predetermined timing, the torque-down amount ΔTe becomes a maximum torque-down amount ΔTemax (> Rd · ted2). A torque down instruction including time ted1, ted2, rate value Rd, and maximum torque down amount ΔTemax is output to engine ECU 16. Here, the predetermined time ted1 is determined to be a first predetermined timing (the torque reduction of the engine 12 is started) during execution of torque phase control described later, and the predetermined time ted2 is executed of torque phase control. It is determined that the second predetermined timing is reached at the completion timing or slightly later (the torque-down amount ΔTe becomes the maximum torque-down amount ΔTemax). Further, the rate value Rd is determined as a value such that the rotational speed of the engine 12 does not decrease before the completion of execution of the torque phase control. Further, the maximum torque down amount ΔTemax may be determined according to the gear position after the automatic transmission 30 is shifted, the rotational speed of the input shaft 31, and the like, or a constant value may be used regardless of these. The engine ECU 16 that has received the torque-down instruction performs intake air amount adjustment control, combustion injection control, and ignition control so that the torque-down amount ΔTe corresponding to the elapsed time from the reception.

  When the execution of the fast fill control is completed (step S120), standby pressure control for driving the engagement-side linear solenoid is executed so that the hydraulic pressure for the engagement-side element is maintained at a relatively low standby pressure for a predetermined time ( Step S130).

  Subsequently, torque phase control is performed to drive the engagement side linear solenoid so that the hydraulic pressure with respect to the engagement side element rises to a predetermined torque phase pressure Pt determined in advance (step S140). Here, as the predetermined torque phase pressure Pt, a hydraulic pressure determined by experiment, analysis, or the like as the upper limit of the hydraulic pressure range in which the rotation of the input shaft 31 does not decrease or a slightly lower hydraulic pressure is used. The torque phase control is a control for gradually (smoothly) increasing the hydraulic pressure with respect to the engagement side element to the predetermined torque phase pressure Pt without reducing the rotational speed of the input shaft 31, and in the embodiment, for the engagement side element. The time required to increase the hydraulic pressure to the predetermined torque phase pressure Pt is assumed to be executed over a time determined by experiments and analysis.

  A constant rate of change (the amount of decrease in the rotational speed per unit time is constant) up to the post-shift target rotational speed Nin * in which the rotational speed of the input shaft 31 is the rotational speed corresponding to the post-shift speed of the automatic transmission 30. ) Starts the inertia phase control for driving the engagement-side linear solenoid so as to decrease (step S150). Here, the inertia phase control is control for adjusting the hydraulic pressure with respect to the engagement side element so that the rotation speed of the input shaft 31 decreases at a constant rate of change to the post-shift target rotation speed Nin *. The process is executed until the rotational speed of 31 reaches the vicinity of the target rotational speed Nin * after the shift. This inertia phase control is executed until the current gear ratio of the automatic transmission 30 obtained by dividing the rotational speed of the input shaft 31 by the rotational speed of the output shaft 32 reaches the vicinity of the gear ratio of the gear stage after the shift. It is good also as what to do.

  When the execution of the inertia phase control is started in this way, when the progress of the rotational change of the rotational speed of the input shaft 31 of the automatic transmission 30 reaches or exceeds a predetermined progress (step S160), the torque reduction of the engine 12 is canceled. Is output to the engine ECU 16 (step S170). Here, when the degree of progress of the rotational change of the rotational speed of the input shaft 31 of the automatic transmission 30 reaches or exceeds a predetermined degree of progress, for example, when a predetermined time elapses from the start of execution of inertia phase control, For example, when the amount of change in the rotational speed of the input shaft 31 reaches or exceeds a predetermined amount of change. The engine ECU 16 that has received the torque down release instruction performs intake air amount adjustment control, combustion injection control, and ignition control so as to gradually release the torque down of the engine 12 (so that the torque down amount ΔTe gradually decreases to a value of 0). Do.

  Then, after the execution of the inertia phase control is completed (step S180), the final control for driving the engagement side linear solenoid is executed so as to maximize the hydraulic pressure on the engagement side element (step S190). Exit the routine.

  FIG. 7 is an explanatory diagram showing an example of the change over time of the torque of the engine 12, the rotational speed of the input shaft 31, and the hydraulic pressure with respect to the engagement side element when the automatic transmission 30 is upshifted. In the embodiment, as shown in the figure, when an upshift of the automatic transmission 30 is instructed (time t1), execution of fast fill control is started (time t2) and a torque down instruction is sent from the transmission ECU 80 to the engine ECU 16. Output (not shown). Then, after executing the fast fill control and executing the standby pressure control, the execution of the torque phase control is started (time t3). After that, when the torque phase control is completed (time t5), the inertia phase control is executed. Start. At this time, in parallel with the torque phase control and inertia phase control, the torque reduction amount ΔTe of the engine 12 is increased at a constant rate value Rd from the first predetermined timing (time t4) during execution of the torque phase control. The torque-down amount ΔTe of the engine 12 is set to the maximum torque-down amount ΔTemax at the timing of completion of execution of the torque phase control (time t5) or slightly later. In the embodiment, the torque reduction of the engine 12 is performed in this way, so that the shift shock is suppressed and the rotation speed of the input shaft 31 is rapidly reduced when the inertia phase control is executed. Then, a torque down release instruction is output from the transmission ECU 80 to the engine ECU 16 (not shown) at a predetermined timing (time t6) during execution of the inertia phase control, and the torque down amount ΔTe of the engine 12 is gradually decreased. To go. When the rotation speed of the input shaft 31 reaches the vicinity of the post-shift target rotation speed Nin * and the execution of the inertia phase control is completed (time t7), the final control is executed to maximize the hydraulic pressure for the engagement side element.

  The operation when upshifting the automatic transmission 30 in the manual shift mode has been described above. Next, the second shift on the higher speed side than the first shift stage after the first upshift, which is an upshift to the first shift stage, is instructed in the manual shift mode until the first upshift is completed. The operation when the second upshift which is an upshift to the stage is instructed, for example, the upshift from the first forward speed to the second forward speed is instructed to the completion of the upshift to the third forward speed An operation when an upshift is instructed will be described. FIG. 8 is a flowchart illustrating an example of a second upshift permission prohibition routine that is executed by the transmission ECU 80. This routine is started when the first upshift is instructed.

  When the second upshift permission prohibition routine is executed, transmission ECU 80 determines whether or not the first upshift has been completed (step S200), and when it is determined that the first upshift has not been completed. Then, it is determined whether or not the second upshift has been instructed (step S210), and when it is determined that the second upshift has not been instructed, the process returns to step S200. Thus, when it is determined in step S200 that the first upshift has been completed while the processes of steps S200 and S210 are being repeatedly performed, this routine is terminated.

  If it is determined in step S210 that the second upshift has been instructed, it is determined whether it is before or after the start of torque reduction of the engine 12 according to the torque down instruction (step S220). This determination can be made based on whether or not a predetermined time ted1 has elapsed since the above torque down instruction was output from the transmission ECU 80 to the engine ECU 16. In order to make this determination more accurately, instead of the predetermined time ted1, a time obtained by adding the communication time between the transmission ECU 80 and the engine ECU 16 to the predetermined time ted1 may be used.

  When it is determined that it is before the start of torque reduction of the engine 12 according to the torque down instruction, execution of the second upshift is permitted (step S230), and this routine is ended. When the execution of the second upshift is thus permitted, the transmission ECU 80 stops the execution of the first upshift and executes the second upshift. For example, if the first upshift instruction is an upshift instruction from the first forward speed to the second forward speed, and the second upshift instruction is an instruction for an upshift from the second forward speed to the third forward speed, the brake Upshift from the first forward speed to the third forward speed is performed by stopping the control of the hydraulic circuit 50 for turning on the B-1 and executing the control of the hydraulic circuit 50 for turning on the clutch C-3. Can be realized.

  When it is determined in step S220 that the torque reduction of the engine 12 in response to the torque reduction instruction has started or not, a second instruction torque reduction amount ΔTeset, which is the torque reduction amount ΔTe of the engine 12 at that time, is acquired ( In step S240, the acquired second instruction time torque reduction amount ΔTeset is compared with a threshold value ΔTeref (step S250). Here, in the embodiment, the second instruction time torque-down amount ΔTeset is included in the torque-down instruction, the elapsed time from the timing when the torque-down instruction is output to the engine ECU 16 by another routine executed by the transmission ECU 80. The values calculated in consideration of predetermined times ted1, ted2, rate value Rd, maximum torque reduction amount ΔTemax, and the like are used. Further, the threshold value ΔTeref is assumed to be a torque down that is assumed to be able to appropriately perform the torque down of the engine 12 for the second upshift even if the execution of the first upshift is stopped and the second upshift is executed. An upper limit of the amount ΔTe or a value slightly smaller than that can be used, and can be determined in consideration of the performance of the engine 12 and the engine ECU 16. In this embodiment, the threshold ΔTeref is set in a range smaller than the product of the rate value Rd1 and the predetermined time ted1 (torque down amount ΔTe immediately before the second predetermined timing).

  When the second instruction torque reduction amount ΔTeset is less than the threshold value ΔTeref, the execution of the second upshift is permitted (step S230), and this routine is terminated. On the other hand, when the second instruction torque reduction amount ΔTeset is equal to or larger than the threshold value ΔTeref, the execution of the second upshift is prohibited (step S260), and after the first upshift is completed (step S270), the second upshift is performed. The execution of the shift is permitted (step S280), and this routine is finished. In the latter case, the transmission ECU 80 first completes the first upshift, and then executes the second upshift. For example, if the first upshift instruction is an upshift instruction from the first forward speed to the second forward speed, and the second upshift instruction is an instruction for an upshift from the second forward speed to the third forward speed, the brake After engaging B-1 to form the second forward speed, the brake B-1 is released and the clutch C-3 is turned on to form the third forward speed.

  Now, a case is considered in which the second upshift is instructed after the torque down of the engine 12 corresponding to the torque down instruction is started before the first upshift is completed. If the first upshift is stopped and the second upshift is executed after the torque down of the engine 12 is started, the torque down amount ΔTe of the engine 12 is relatively large depending on the timing. May not be properly performed for execution of the second upshift, and a shift shock may occur. In the embodiment, based on this, in principle, the execution of the second upshift is prohibited after the torque reduction of the engine 12 according to the torque down instruction is started. As a result, the execution of the first upshift is continued, so that inconvenience due to the inability to properly reduce the torque of the engine 12 and the subsequent return for the second upshift, for example, the occurrence of a shift shock Etc. can be suppressed. On the other hand, since the second upshift is instructed, it is desirable to cope with the request as much as possible. Therefore, in the embodiment, even after the torque reduction of the engine 12 according to the torque reduction instruction is started, the execution of the second upshift is permitted when the second instruction torque reduction amount ΔTeset is less than the threshold value ΔTeref. did. This is considered that when the second instruction torque reduction amount ΔTeset is less than the threshold value ΔTeref, it is highly likely that the torque reduction of the engine 12 and the subsequent return can be appropriately performed for the second upshift. This is based on the reason. Thereby, when the second upshift is instructed after the torque down of the engine 12 in response to the torque down instruction is started, the execution of the second upshift is prohibited regardless of the torque down amount ΔTe. Thus, the range in which the first upshift is stopped and the execution of the second upshift is permitted can be expanded.

  FIG. 9 shows that the second upshift is instructed when the torque down amount ΔTe of the engine 12 is less than the threshold value ΔTeref from when the first upshift of the automatic transmission 30 is instructed to when the first upshift is completed. Output torque of the engine 12, the rotational speed of the input shaft 31, the first engagement side hydraulic pressure that is the hydraulic pressure for the clutch and brake to be engaged in the first upshift and the second upshift, and the second engagement side hydraulic pressure It is explanatory drawing which shows an example of the mode of a time change. In the figure, time tref1 is a time when a torque-down instruction is output from the transmission ECU 80 to the engine ECU 16, and time tref2 is a time when the torque-down amount ΔTe of the engine 12 reaches the threshold value ΔTeref. The alternate long and short dash line indicates the output torque of the engine 12, the rotational speed of the input shaft 31, the first engagement side hydraulic pressure, and the second engagement when the execution of the first upshift is continued regardless of the second upshift instruction. It is a state of the time change of the side oil pressure. In the embodiment, when the second upshift instruction is given at time t10 before time tref2, as shown in the figure, the first engagement side hydraulic pressure is decreased to stop execution of the first upshift, By executing the second upshift by increasing the engagement side hydraulic pressure, the shift stage related to the second upshift can be quickly performed as compared with the case where the second upshift is executed after the first upshift is completed. Can be formed. On the other hand, as described above, when the second upshift is instructed after time tref2, the execution of the first upshift is continued, so that the torque reduction of engine 12 and the subsequent return can be performed for the second upshift. Inconvenience due to the failure to perform properly, for example, occurrence of a shift shock can be suppressed.

  According to the automatic transmission device 20 of the above-described embodiment, when the upshift of the automatic transmission 30 is instructed, the automatic transmission 30 is controlled and the engine is controlled so that the upshift is performed to the gear position according to the instruction. 12 that outputs a torque down instruction, which is an instruction to decrease the output torque of 12, to the engine ECU 16, from the first upshift of the automatic transmission 30 to the completion of the first upshift, When the second upshift is instructed before the torque down of the engine 12 according to the engine is started, the execution of the second upshift is permitted, and after the torque down of the engine 12 according to the torque down instruction is started In principle, when the second upshift is instructed, the execution of the second upshift is prohibited. Can run Ppushifuto, in the latter case it is possible to suppress the like occurrence of shift shock. As a result, when the second upshift is instructed from when the first upshift of the automatic transmission 30 is instructed to when the first upshift is completed, it is possible to cope more appropriately.

  Moreover, according to the automatic transmission device 20 of the embodiment, the torque reduction of the engine 12 in response to the torque down instruction is performed after the first upshift of the automatic transmission 30 is instructed until the first upshift is completed. When the second upshift is instructed after the start, if the torque down amount ΔTe of the engine 12 when the second upshift is instructed is less than the threshold ΔTeref, the execution of the second upshift is permitted. The range in which execution of the second upshift is permitted can be expanded.

  In the automatic transmission device 20 according to the embodiment, the first upshift of the automatic transmission 30 is instructed and the first upshift is completed, and after the torque down of the engine 12 is started in response to the torque down instruction. When the second upshift is instructed, execution of the second upshift is permitted when the second instruction torque down amount ΔTeset is less than the threshold value ΔTeref, and when the second instruction torque down amount ΔTeset is greater than or equal to the threshold value ΔTeref. Although the execution of the second upshift is prohibited, the torque reduction of the engine 12 in accordance with the torque down instruction after the first upshift of the automatic transmission 30 is instructed until the first upshift is completed. When the second upshift is instructed after the start of the second instruction, the second instruction torque reduction amount ΔTese Regardless of t, the execution of the second upshift may be prohibited. By so doing, it is possible to more reliably suppress the occurrence of a shift shock.

  In the automatic transmission device 20 according to the embodiment, the first upshift of the automatic transmission 30 is instructed and the first upshift is completed, and after the torque down of the engine 12 is started in response to the torque down instruction. When the second upshift is instructed, the execution of the second upshift is permitted or prohibited in accordance with the second instruction torque down amount ΔTeset, but instead of the second instruction torque down amount ΔTeset or In addition, the elapsed time from the timing when the first upshift is instructed, the elapsed time from the timing when the torque reduction instruction is output from the transmission ECU 80 to the engine ECU 16, the timing for starting the torque reduction of the engine 12 (first predetermined timing) The execution of the second upshift is permitted or prohibited using the elapsed time from It is good. Here, the threshold value corresponding to these elapsed times is, for example, a time period from each start timing to a timing at which the torque down amount ΔTe of the engine 12 is assumed to reach the threshold value ΔTeref or more. it can. For example, when the execution of the second upshift is permitted or prohibited using the second command torque down amount ΔTeset and the elapsed time from the first predetermined timing, the second command torque down amount ΔTeset is less than the threshold value ΔTeref and the torque When the elapsed time from the down start timing is less than the threshold, execution of the second upshift is permitted. When the second command torque down amount ΔTeset is greater than or equal to the threshold ΔTeref or when the elapsed time from the torque down start timing is greater than or equal to the threshold, Execution of two upshifts may be prohibited.

  In the automatic transmission device 20 according to the embodiment, the operation when the upshift of the automatic transmission 30 is instructed in the manual transmission mode and the upshift is performed has been described. However, the upshift of the automatic transmission 30 is instructed in the normal transmission mode. It is also possible to perform the same upshifting. That is, when an upshift of the automatic transmission 30 is instructed, the automatic transmission 30 is controlled so that the upshift is performed to the gear position corresponding to the instruction, and a torque down instruction is output to the engine ECU 16 to automatically shift the gear. When the second upshift is instructed before the torque down of the engine 12 is started in response to the torque down instruction from when the first upshift of the machine 30 is instructed until the first upshift is completed, the second upshift is instructed. The execution of the second upshift is permitted, and when the second upshift is instructed after the torque reduction of the engine 12 in response to the torque down instruction is started, the execution of the second upshift is prohibited in principle (second instruction). The execution of the second upshift may be permitted or prohibited according to the hour torque down amount ΔTset). In the normal transmission mode, the automatic transmission 30 (hydraulic circuit 50) is normally controlled so that the automatic transmission 30 forms the target shift stage GS * based on the accelerator opening Acc and the vehicle speed V.

  In the automatic transmission 20 according to the embodiment, when the second upshift is instructed after the first upshift of the automatic transmission 30 is instructed until the first upshift is completed, the torque down instruction is accepted. The execution of the second upshift is permitted or prohibited depending on whether the torque reduction of the engine 12 is started or after the start of the torque reduction, but the upshifting of the automatic transmission 30 is instructed. Similarly, when a downshift is instructed by an increase in torque to be output to the output shaft 32 before the shift is completed (when the downshift of the automatic transmission 30 is to be executed while increasing the output torque of the engine 12). The execution of the downshift is permitted or prohibited depending on whether the torque reduction of the engine 12 according to the torque down instruction is started or after it is started. It may be intended to.

  In the automatic transmission 20 according to the embodiment, the second instruction time torque reduction amount ΔTset includes the elapsed time from the timing at which the torque reduction instruction is output to the engine ECU 16, predetermined times ted1, ted2, rate value Rd, The value calculated by the transmission ECU 80 in consideration of the maximum torque down amount ΔTemax is used, but the value calculated by the engine ECU 16 using the intake air amount, fuel injection amount, ignition timing, etc. of the engine 12 is used. It is good also as what is acquired by communication.

  In the automatic transmission 20 according to the embodiment, when the upshift of the automatic transmission 30 is instructed, the torque down amount ΔTe of the engine 12 becomes 0 until the first predetermined timing after the engine ECU 16 receives the torque down instruction. The torque down amount ΔTe increases at a constant rate value Rd from the first predetermined timing to the second predetermined timing, and after the second predetermined timing, the torque down amount ΔTe becomes the maximum torque down amount ΔTemax (> Rd · ted2). As described above, the torque down instruction including the predetermined times ted1, ted2, the rate value Rd, and the maximum torque down amount ΔTemax is output to the engine ECU 16 until the second predetermined timing after the engine ECU 16 receives the torque down instruction. Indicates that the torque down amount ΔTe of the engine 12 is 0, After two predetermined timing so that the torque-down amount ΔTe is maximum torque reduction amount DerutaTemax, may output a torque down instruction including the predetermined time ted2 and the maximum torque reduction amount DerutaTemax the engine ECU 16.

  In the automatic transmission 20 of the embodiment, when an upshift of the automatic transmission 30 is instructed, a torque down instruction including a predetermined time ted1, ted2 and a rate value Rd and a maximum torque down amount ΔTemax is transmitted to the engine ECU 16. However, instead of the maximum torque-down amount ΔTemax, a torque-down instruction including the minimum torque Telim during the shift that is the minimum value of the limit value Telim for limiting the output torque of the engine 12 may be transmitted to the engine ECU 16. . That is, the output torque of the engine 12 is not limited until the first predetermined timing after the engine ECU 16 receives the torque-down instruction, and the limit value Telim is the engine at the first predetermined timing from the first predetermined timing to the second predetermined timing. The output torque of the engine 12 is reduced by decreasing from the output torque of 12 at a constant rate value Rd, and the output torque of the engine 12 is reduced by the limit value Telim becoming the minimum torque Telim during the shift after the second predetermined timing. As described above, a torque down instruction including predetermined times ted1, ted2, rate value Rd, and minimum torque during shifting Telim may be output to engine ECU 16. In this case, when the second upshift is instructed after the first upshift of the automatic transmission 30 is instructed until the first upshift is completed and after the torque down instruction is output to the engine ECU 16, When the difference between the output torque of the engine 12 at the first predetermined timing and the output torque of the engine 12 when the second upshift is instructed is less than the above threshold value ΔTeref, the execution of the second upshift is permitted, and the first predetermined shift is permitted. The execution of the second upshift may be prohibited when the difference between the output torque of the engine 12 at the timing and the output torque of the engine 12 when the second upshift is instructed is equal to or greater than a threshold value ΔTeref.

  In the automatic transmission 20 according to the embodiment, the torque down instruction is output to the engine ECU 16 when the execution of the fast fill control is started. However, when the execution of the fast fill is completed (when the standby pressure control is started). Alternatively, a torque down instruction may be output to the engine ECU 16 when the standby pressure control is ended (when the torque phase control is started) or the like. Even in these cases, when the second upshift is instructed after the first upshift of the automatic transmission 30 is instructed until the first upshift is completed, the torque down instruction is sent to the engine as in the embodiment. The execution of the second upshift may be permitted or prohibited depending on whether it is output to the ECU 16 or after it is output.

  In the automatic transmission 20 of the embodiment, as the torque phase control, the hydraulic pressure with respect to the engagement side element is gradually (smoothly) increased to the predetermined torque phase pressure Pt without decreasing the rotational speed of the input shaft 31. However, it is good also as what raises in step shape.

  In the automatic transmission 20 according to the embodiment, when the automatic transmission 30 is shifted, the torque phase control is performed after the fast fill control and the standby pressure control are performed. The torque phase control may be executed without executing the control.

  In the embodiment, the automobile 10 includes the engine ECU 16 that controls the engine 12 and the transmission ECU 80 that controls the automatic transmission 30. However, the engine ECU 16 and the transmission ECU 80 are configured as a single electronic control unit. It may be configured. In this case, when an upshift of the automatic transmission 30 is instructed, a torque down instruction may be output within a single electronic control unit.

  In the automatic transmission device 20 of the embodiment, the 6-speed automatic transmission 30 is used. However, a 3-speed, 4-speed, 5-speed automatic transmission may be used, and a 7-speed, 8-speed or higher speed may be used. An automatic transmission may be used.

  In the embodiment, the present invention is applied to the form of the automatic transmission 20, but a control method of the automatic transmission 20 may be used.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the automatic transmission 30 corresponds to a “transmission”, and when the upshift of the automatic transmission 30 is instructed, the automatic transmission 30 is controlled so that the upshift is performed at the gear position according to the instruction. The transmission ECU 80 that corresponds to “transmission control means” outputs a torque down instruction, which is an instruction to decrease the output torque of the engine 12, to the engine ECU 16 when an upshift of the automatic transmission 30 is instructed. The ECU 80 corresponds to “decrease instructing means”, and the torque reduction of the engine 12 in response to the torque down instruction is started after the first upshift of the automatic transmission 30 is instructed until the first upshift is completed. When a second upshift is instructed before the engine 12 The transmission ECU 80 that executes the second upshift permission prohibiting routine of FIG. 8 that prohibits the execution of the second upshift in principle when the second upshift is instructed after the start is designated as “second change permission prohibiting means”. It corresponds to.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the manufacturing industry of automatic transmissions.

  DESCRIPTION OF SYMBOLS 10 Car, 11a, 11b Drive wheel, 12 Engine, 14 Crankshaft, 14a Rotational speed sensor, 16 Engine electronic control unit (engine ECU), 17 Brake electronic control unit (brake ECU)), 18 Front cover, 20 Power Transmission device, 22 Fluid transmission device, 23 Pump impeller, 24 Turbine runner, 25 Stator, 26 One-way clutch, 28 Lock-up clutch, 30 Automatic transmission, 31 Input shaft, 31a Rotational speed sensor, 32 Output shaft, 32a Rotational speed sensor , 35 planetary gear mechanism, 36 sun gear, 37 ring gear, 38 pinion gear, 39 carrier, 40 planetary gear mechanism, 41a sun gear, 41b sun gear, 42 ring gear, 43a short pinion gear, 43b long Nion gear, 44 carrier, 48 gear mechanism, 49 differential gear, 50 hydraulic circuit, 52 mechanical oil pump, 54 regulator valve, 55 linear solenoid 56 manual valve, 80 electronic control unit for transmission (transmission ECU), 91 shift lever , 92 shift position sensor, 93 accelerator pedal, 94 accelerator pedal position sensor, 95 brake pedal, 96 brake switch, 98 vehicle speed sensor, B-1, B-2 brake, C-1 to C-3 clutch, F-1 one way Clutch, SLB1, SLC1 linear solenoid.

Claims (6)

A stepped transmission that transmits power input from the power source to the input shaft to the output shaft while changing the shift stage, and the shift stage is changed when an instruction to change the shift stage of the transmission is given. Transmission control means for controlling the transmission, and reduction instruction means for outputting an instruction to lower the output torque of the power source to the power source control means for controlling the power source when the change instruction is an upshift instruction. An automatic transmission comprising:
Before an upshift to the first shift stage is completed after an upshift instruction to the first shift stage of the transmission is made, a decrease in the output torque of the power source in response to the decrease instruction starts. When an instruction to change to the second gear stage different from the first gear stage is given before the change, the change to the second gear stage is permitted, and the output torque of the power source in response to the lowering instruction Second change permission prohibiting means for prohibiting the change to the second shift stage when an instruction to change to the second shift stage is issued after the start of the decrease of
An automatic transmission comprising: The automatic transmission according to claim 1,
The lowering instruction means is a means for outputting the lowering instruction so that the output torque of the power source starts to decrease before the rotational speed of the power source starts to decrease when the change instruction is an upshift instruction,
The second change permission prohibiting means moves to the second shift stage when an instruction to change to the second shift stage is made after the decrease of the output torque of the power source in response to the decrease instruction is started. Means for permitting a change to the second gear position when the degree of reduction in the output torque of the power source is less than a threshold value determined within a range in which the rotational speed of the power source does not drop. Is,
Automatic transmission. The automatic transmission according to claim 1 or 2,
The decrease in the output torque of the power source in response to the decrease instruction is when a predetermined time has elapsed since the decrease instruction was output to the power source control means.
Automatic transmission. An automatic transmission according to any one of claims 1 to 3,
The second change permission prohibiting means completes the upshift to the first shift stage when the change to the second shift stage is prohibited when an instruction to change to the second shift stage is issued. Means for permitting a change to the second gear after
Automatic transmission. The automatic transmission according to any one of claims 1 to 4, wherein
The lowering instruction means is means for outputting the lowering instruction when an upshift of the transmission is instructed by a shift operation by an operator.
Automatic transmission. A stepped transmission for transmitting power input from the power source to the input shaft to the output shaft while changing the shift stage, so that the shift stage is changed when an instruction to change the shift stage of the transmission is given. A control method for an automatic transmission that controls the transmission and outputs an instruction to lower the output torque of the power source to power source control means for controlling the power source when the change instruction is an upshift instruction,
Before an upshift to the first shift stage is completed after an upshift instruction to the first shift stage of the transmission is made, a decrease in the output torque of the power source in response to the decrease instruction starts. When an instruction to change to the second gear stage different from the first gear stage is given before the change, the change to the second gear stage is permitted, and the output torque of the power source in response to the lowering instruction When a change instruction to the second shift stage is issued after the start of the decrease of the second shift stage, the change to the second shift stage is prohibited.
An automatic transmission control method characterized by the above.

Images