JP5131233B2 - Control device for vehicle power transmission device - Google Patents

Description

  The present invention relates to a control device for a vehicle power transmission device, and more particularly to drive system protection during a switching operation from a non-traveling range to a traveling range.

  2. Description of the Related Art A vehicle power transmission device in which an automatic transmission is provided in a power transmission path between an engine and drive wheels is well known. In the automatic transmission, the power transmission state is switched according to the operation of a shift lever provided in the driver's seat. For example, when the shift lever is operated to a “D” position, an “L” position, or the like, the forward travel range that enables forward travel in the automatic transmission is switched. In addition, when operated to the “R” position, the automatic transmission is switched to a reverse travel range that enables reverse travel in the automatic transmission. Further, when the “N” position or the “P” position is operated, the automatic transmission is switched to the non-traveling range in which the power transmission of the automatic transmission is cut off.

  In the vehicle power transmission device configured as described above, when the accelerator pedal is depressed in the non-traveling range (“N” position, “P” position, etc.), the engine is blown and the rotational speed is increased. If it is switched to the driving range (such as “D” position), the drive system (automatic transmission, propeller shaft, final reduction gear, drive shaft, etc.) generates high input torque. A large load was applied, and durability could be reduced.

  On the other hand, in the control device for the automatic transmission for a vehicle disclosed in Patent Document 1, when the accelerator pedal is depressed in the non-traveling range (stop range) and the engine is blown (N racing), the engine against the depression of the accelerator pedal. Disclosed is a technology that suppresses engine output torque by restricting the throttle valve opening of the engine to suppress the generation of high input torque on the drive system (automatic transmission, propeller shaft, final reduction gear, drive shaft, etc.) Has been. As a result, it is possible to suppress the high input torque applied to the drive system that is generated when the travel range is switched, and it is possible to suppress a decrease in durability of the drive system.

Japanese Patent Laid-Open No. 10-169481 Japanese Patent Laid-Open No. 5-141530 JP 2004-116440 A

  By the way, for example, when the driver desires a sudden start in the forward direction during reverse travel (reverse travel), the driver switches the automatic transmission to the non-travel range ("N" position) during reverse travel, and the accelerator pedal. May be switched to a forward travel range (such as “D” position) in a state where the engine is blown and the engine is blown to increase the rotational speed (racing state). Similarly, at this time, since a high input torque is generated in the drive system, there is a possibility that a large load is applied to the drive system and durability is lowered. On the other hand, in the conventional control, when the vehicle is traveling backward at a relatively low vehicle speed or suddenly starting in the forward direction from the stopped state, it is driven by controlling the clutch engagement in the automatic transmission and the engine speed. The generation of high input torque applied to the system is prevented. Specifically, at the time of switching to the forward travel range, the engagement speed of the clutch that establishes the forward shift speed is reduced, and the generation of high input torque is suppressed by reducing the engine rotation speed.

  However, when the vehicle speed exceeds the predetermined speed, interference with the shift control (clutch control) of the automatic transmission occurs, which makes it difficult to perform clutch control during forward travel range switching. Therefore, when the vehicle speed of the vehicle exceeds a predetermined speed, no effective means for suppressing generation of high input torque applied to the drive system has been found.

  The present invention has been made against the background of the above circumstances, and an object of the present invention is to provide a control device for a vehicle power transmission device including an automatic transmission in a power transmission path between an engine and driving wheels. An object of the present invention is to provide a control device for a vehicle power transmission device that can prevent high input torque input to a drive system even when the vehicle is switched to forward travel during reverse travel at a relatively high vehicle speed. is there.

  In order to achieve the above object, the gist of the invention according to claim 1 is that: (a) an automatic transmission provided in a power transmission path between an engine and a drive wheel; A control device for a vehicle power transmission device, comprising: a racing suppression means that suppresses racing by restricting engine output regardless of depression of an accelerator pedal in the travel range; (b) the automatic transmission is in a non-travel range. The racing suppression means is implemented only when the vehicle is traveling backward in a certain state and the vehicle speed is equal to or higher than a predetermined value.

  The gist of the invention according to claim 2 is that, in the control device for a vehicle power transmission device according to claim 1, when the vehicle speed of the vehicle is less than a predetermined value and when the vehicle is traveling forward, the racing is performed. The suppression means is not implemented.

  According to a third aspect of the present invention, there is provided a control device for a vehicle power transmission device according to the first or second aspect, wherein the racing suppression means is a throttle for an accelerator opening corresponding to an accelerator pedal depression amount. The valve opening is limited.

  According to a fourth aspect of the present invention, there is provided a control device for a vehicle power transmission device according to any one of the first to third aspects, wherein the automatic transmission is in a forward travel range during the execution of the racing suppression means. When switching to, the racing suppression means is stopped, and the throttle valve opening is raised according to the accelerator opening.

  According to a fifth aspect of the present invention, there is provided the control device for a vehicle power transmission device according to any one of the first to fourth aspects, wherein the predetermined value of the vehicle speed is determined by a shift control of the automatic transmission. It is characterized by being set to a speed lower than the vehicle speed to be implemented.

  According to a sixth aspect of the present invention, in the control device for a vehicle power transmission device according to any one of the first to fifth aspects, when the vehicle speed is less than a predetermined value, the automatic transmission is not turned on. When the traveling range is switched to the traveling range, the input torque to the automatic transmission is suppressed by the engagement control of the automatic transmission.

  According to the control device for a vehicle power transmission device of the first aspect of the present invention, when the automatic transmission is in a reverse traveling state in a state where the automatic transmission is in the non-traveling range and the vehicle speed is equal to or higher than a predetermined value. However, since the racing suppression means is implemented, high input torque is preferably prevented from being applied to the drive system even when the automatic transmission is switched to the forward travel range. For example, when the vehicle speed is less than a predetermined value, the shift control of the automatic transmission is not executed. Therefore, when the automatic transmission is switched from the non-traveling range to the forward traveling range, the clutch engagement of the automatic transmission is performed. Control that suppresses generation of high input torque applied to the drive system at the time of forward travel range switching is performed by the combined control and the engine speed control. However, when the vehicle speed exceeds a predetermined value, interference with the shift control of the automatic transmission occurs, making the control difficult. On the other hand, if the automatic transmission is implemented with racing suppression means that suppresses racing by limiting the engine output regardless of the accelerator pedal being depressed in the non-traveling range, the automatic transmission is switched to the forward traveling range. Generation of high input torque is suppressed. In addition, since the said racing suppression means is implemented in the state switched to the non-traveling range, there exists a problem that the startability (starting response property) when switched to the forward travel range falls. Therefore, by limiting the implementation of the racing suppression means only when the vehicle is traveling backward and the vehicle speed is equal to or higher than a predetermined value, the influence on general traveling such as startability can be suppressed. it can.

  According to the control device for a vehicle power transmission device of the invention according to claim 2, the racing suppression means is not implemented when the vehicle speed of the vehicle is less than a predetermined value and when the vehicle is traveling forward. It is possible to reduce the influence due to the implementation of the suppression means. For example, when the vehicle speed is less than a predetermined value, the automatic transmission shift control is not performed. Therefore, the control for suppressing the generation of high input torque by the clutch engagement control of the automatic transmission for switching to the forward travel range. Can be implemented. Specifically, the generation of high input torque applied to the drive system is suppressed by reducing the clutch engagement speed. Here, if the racing suppression means is implemented in a region where the vehicle speed is equal to or less than a predetermined value, the vehicle starts from a state where the output of the engine is limited, and the vehicle startability (startup response) at the time of forward travel may be reduced. There is sex. Therefore, the conventional control is performed when the vehicle speed is less than the predetermined value, and the racing suppression means is performed only when the vehicle speed during the reverse traveling is equal to or higher than the predetermined value, thereby affecting the general traveling. Can be reduced.

  According to the control device for a vehicle power transmission device of the invention according to claim 3, the racing suppressing means limits the throttle valve opening relative to the accelerator opening corresponding to the depression amount of the accelerator pedal. Even when switching from the non-traveling range to the forward traveling range, the engine output is limited by the throttle valve opening limit and the rotational speed is suppressed, so that high input torque applied to the drive system is generated. It is preferably prevented.

  According to the control device for a vehicle power transmission device of the invention according to claim 4, when the automatic transmission is switched to the forward travel range during the execution of the racing suppression means, the racing suppression means is stopped and the accelerator Since the throttle valve opening is increased according to the opening, the restriction on the engine output is released, and the responsiveness deterioration by the racing suppressing means can be suppressed to the minimum.

  According to the control device for a vehicle power transmission device of the invention according to claim 5, the predetermined value of the vehicle speed is set to a speed lower than the vehicle speed at which the shift control of the automatic transmission is performed. In the region less than the predetermined value, interference due to the shift control of the automatic transmission does not occur, so that the generation of high input torque applied to the drive system by the clutch engagement control of the automatic transmission is suppressed.

  According to the control device for a vehicle power transmission device of the invention of claim 6, when the vehicle speed is less than a predetermined value, the automatic transmission is switched from the non-traveling range to the traveling range. Since the input torque to the automatic transmission is suppressed by the engagement control, the generation of a high input torque to the drive system including the automatic transmission is suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a skeleton diagram illustrating a configuration of a vehicle automatic transmission to which the present invention is applied. FIG. 2 is an operation chart for explaining a combination of operations of the friction engagement device when establishing a plurality of gear stages of the vehicle automatic transmission of FIG. 1. FIG. 2 is a block diagram illustrating a schematic configuration of a main part of a control system provided in a vehicle for controlling the automatic transmission and the like of FIG. 1 and a power transmission system from an engine to driving wheels. FIG. 4 is a circuit diagram relating to a linear solenoid valve that controls the operation of each hydraulic actuator of clutches C1 and C2 and brakes B1 to B3 in the hydraulic control circuit of FIG. 3. It is a functional block diagram explaining the principal part of the control function of the electronic control apparatus of FIG. It is a figure which shows an example of the shift map used in the shift control of an automatic transmission. It is a figure explaining the action | operation in case a driver | operator performs sudden start to a forward drive during reverse drive. It is a figure which shows the operation area | region of a racing suppression means. 7 is a flowchart for explaining a control operation that can suppress generation of a high input torque applied to the drive system in a main part of the control operation of the electronic control device, that is, in a sudden start in the forward direction from when the vehicle is traveling backward. It is a time chart for demonstrating the operation state based on the control action of an electronic control apparatus, and respond | corresponds to the flowchart of FIG.

  Here, preferably, the drive system corresponds to each rotating member to which power from the engine is transmitted. Specifically, it corresponds to, for example, an automatic transmission, a propeller shaft, a final reduction gear, a drive shaft, and the like.

  Preferably, the state in which the automatic transmission is in the travel range refers to a state in which the automatic transmission can transmit power, and specifically, a state in which a predetermined shift stage is established in the automatic transmission. Equivalent to. The state in which the automatic transmission is in the non-traveling range refers to a state in which the power transmission of the automatic transmission is interrupted, and specifically, a friction engagement device that establishes a predetermined gear stage of the automatic transmission. Corresponds to the released state.

  Preferably, when the throttle valve opening is limited, the engine output is limited as the intake amount to the engine is limited.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the drawings are appropriately simplified or modified, and the dimensional ratios, shapes, and the like of the respective parts are not necessarily drawn accurately.

  FIG. 1 is a skeleton diagram of a vehicular automatic transmission (hereinafter referred to as an automatic transmission) 10 which is a part of a vehicular power transmission device. FIG. 2 is an operation table for explaining the operation state of the friction engagement element, that is, the friction engagement device, when a plurality of shift stages (gear stages) are established. The automatic transmission 10 is provided in a power transmission path between the engine 30 and the drive wheels 40, and is preferably used for an FF vehicle that is mounted in the left-right direction (sideways) of the vehicle. The automatic transmission 10 includes, in a transmission case 26 as a non-rotating member attached to a vehicle body, a first transmission unit 14 mainly composed of a single pinion type first planetary gear unit 12 and a double pinion type first gear unit. The second planetary gear unit 16 and the single pinion type third planetary gear unit 18 have a second transmission 20 configured as a Ravigneaux as a main component on a common axis C, and the rotation of the input shaft 22 is changed. And output from the output gear 24.

The input shaft 22 is a turbine shaft of a torque converter 32 including a lock-up clutch 33 as a fluid transmission device that is rotationally driven by an engine 30 that is a driving power source. Further, the output gear 24 meshes with a counter driven gear arranged coaxially with a differential drive pinion that meshes with a differential ring gear 36 and constitutes a final gear pair in order to transmit power to the differential gear device 34 shown in FIG. Counter gears constituting a counter gear pair. The rotational speed N _OUT of the output gear 24 is detected by the rotational speed sensor 66 and supplied to the electronic control unit 100 described later. Then, the vehicle speed V is calculated based on the rotational speed N _OUT and used for shift determination.

  In the automatic transmission 10 configured as described above, the output of the engine 30 is transmitted to the pair of drive wheels 40 via the torque converter 32, the automatic transmission 10, the differential gear unit 34, the pair of axles 38, and the like. (See FIG. 3). The automatic transmission 10 and the torque converter 32 are substantially symmetrical with respect to the center line (axial center) C, and the lower half of the center line C is omitted in the skeleton diagram of FIG. .

  The automatic transmission 10 corresponds to a combination of any one of the rotational states (sun gears S1 to S3, carriers CA1 to CA3, ring gears R1 to R3) of the first transmission unit 14 and the second transmission unit 20 according to the combination. Six forward gear stages from the first speed gear stage “1st” to the sixth speed gear stage “6th” are established, and the reverse gear stage “R” is established. As shown in FIG. 2, for example, in the forward gear stage, the first speed gear stage is engaged by the engagement of the clutch C1 and the brake B2, and the second speed gear stage is engaged by the engagement of the clutch C1 and the brake B1, and the clutch C1 is engaged. The third gear is set by engagement with the brake B3, the fourth gear is set by engagement of the clutch C1 and the clutch C2, and the fifth gear is set by engagement of the clutch C2 and the brake B3. The sixth gear is established by engaging the brake B1. Further, the reverse gear is established by the engagement of the brake B2 and the brake B3, and the neutral state is established by releasing any of the clutches C1, C2 and the brakes B1 to B3.

  The operation table of FIG. 2 summarizes the relationship between the above gear stages and the operation states of the clutches C1, C2 and the brakes B1 to B3, where “◯” indicates engagement and “◎” indicates only during engine braking. Represents the event. In particular, since the one-way clutch F1 is provided in parallel to the brake B2 that establishes the first gear stage “1st”, only the clutch C1 is engaged and the engine brake is applied when starting (acceleration). When the clutch C1 is to be engaged, the clutch C1 and the brake B2 are engaged. Further, the gear ratio (transmission ratio) γ of each gear stage (= the rotational speed of the input shaft 22 / the rotational speed of the output gear 24) is the first planetary gear device 12, the second planetary gear device 16, and the third planetary gear. Each gear ratio of the device 18 (= the number of teeth of the sun gear / the number of teeth of the ring gear) is appropriately determined according to ρ1, ρ2, and ρ3.

  Thus, the automatic transmission 10 of the present embodiment establishes a plurality of gear stages having different gear ratios by selectively engaging a plurality of friction engagement devices, that is, the clutches C1 and C2 and the brakes B1 to B3. As is apparent from the operation table of FIG. 2, the gears can be switched by so-called clutch-to-clutch shifts in which any two of the clutches C1 and C2 and the brakes B1 to B3 are changed.

  The clutches C1 and C2 and the brakes B1 to B3 (hereinafter simply referred to as the clutch C and the brake B unless otherwise specified) are hydraulic friction members that are engaged and controlled by a hydraulic actuator such as a multi-plate clutch or a brake. Engagement and de-energization and current control of the linear solenoid valves SL1 to SL5 of the hydraulic control circuit 50 (see FIG. 3) can be switched between engaged and disengaged state, and transient oil pressure during engagement and disengagement can be Be controlled.

  FIG. 3 is a block diagram illustrating a schematic configuration of a main part of a control system provided in the vehicle for controlling the automatic transmission 10 and the like of FIG. 1 and a power transmission system from the engine 30 to the drive wheels 40. .

  In FIG. 3, the electronic control unit 100 is configured to include a so-called microcomputer having a CPU, a RAM, a ROM, an input / output interface and the like, for example, and the CPU stores in the ROM in advance using the temporary storage function of the RAM. By performing signal processing according to the programmed program, output control of the engine 30, shift control of the automatic transmission 10 and the like are executed, and linear solenoid valves for engine control and hydraulic control circuit 50 are executed as necessary. It is configured separately for shift control for controlling SL1 to SL5.

For example, the electronic control unit 100 includes an accelerator opening signal indicating the accelerator opening Acc corresponding to the operation amount of the accelerator pedal 52 detected by the accelerator opening sensor 54, and the engine 30 detected by the engine rotation speed sensor 56. represents a signal indicative of the engine rotation speed N _E is the rotational speed, a signal representing the cooling water temperature T _W of the engine 30 detected by a coolant temperature sensor 58, the intake air quantity Q of the engine 30 detected by the intake air quantity sensor 60 Signal, a throttle valve opening signal representing the throttle valve opening θ _TH of the electronic throttle valve 62 detected by the throttle valve opening sensor 64, and an output rotational speed that is the rotational speed of the output gear 24 detected by the rotational speed sensor 66. N _OUT that is, the signal representing the vehicle speed V, the service brake, which is detected by the brake switch 70 Signal representing the operation (ON) B _ON of a foot brake pedal 68 illustrates one foot brake during operation of the (wheel brakes) (in depressing), the lever position of the shift lever 72 of the shift device 71 detected by a lever position sensor 74 (operating position, shift position) signal representing the P _SH, the signal representing the rotational speed of the turbine rotational speed N _T i.e. the input shaft 22 is the rotation speed of the turbine shaft of the torque converter 32 detected by a turbine rotational speed sensor 76, aT A signal representing the AT oil temperature T _OIL which is the temperature of the hydraulic oil in the hydraulic control circuit 50 detected by the oil temperature sensor 78 is supplied.

Further, the electronic control unit 100 supplies fuel to the drive signal to the throttle actuator 80 that opens and closes the electronic throttle valve 62, the ignition signal that commands the ignition timing of the engine 30, the intake pipe or the cylinder of the engine 30, or A fuel supply amount signal for controlling the fuel supply amount to the engine 30 by the fuel injection device 82 to be stopped, a lever position P _SH display signal for operating the shift indicator, and a hydraulic control circuit for switching the gear stage of the automatic transmission 10 A signal for controlling the shift solenoid for driving the shift valve in the motor 50, a command signal for driving the linear solenoid valve for controlling the line pressure, and the like are output.

  The shift lever 72 is disposed, for example, in the vicinity of the driver's seat, and is manually operated to five lever positions “P”, “R”, “N”, “D”, or “S” as shown in FIG. It has come to be.

The “P” position releases a power transmission path in the automatic transmission 10, that is, a neutral state (neutral state) in which the power transmission in the automatic transmission 10 is interrupted, and mechanically rotates the output gear 24 by a mechanical parking mechanism. Is a parking range (position) for preventing (locking), the “R” position is a reverse running range for reversely rotating the rotation direction of the output gear 24 of the automatic transmission 10, and the “N” position is This is a non-traveling range for setting the neutral state in which the power transmission in the automatic transmission 10 is cut off, and the “D” position is a shift range that allows the automatic transmission 10 to change gears. This is a forward travel range in which automatic shift control is executed using all the forward gear stages of 6 gear stages “6th”, and the “S” position limits the range of change of the gear stages. Several shift range i.e. gear of high vehicle speed side is the forward running range capable manual shift by switching plural different types of shift ranges. In this “S” position, the shift range is shifted to the down side every time the shift lever 72 is operated, the “+” position as the lever position P _SH for shifting the shift range to the up side every time the shift lever 72 is operated. A “−” position is provided as a lever position P _SH for the movement.

4 is a linear solenoid valve that controls the operation of the hydraulic actuators (hydraulic cylinders) A _C1 , A _C2 , A _B1 , A _B2 , A _B3 of the clutches C1, C2 and the brakes B1 to B3 in the hydraulic control circuit 50. It is a circuit diagram regarding SL1 to SL5.

In FIG. 4, each hydraulic actuator A _C1 , A _C2 , A _B1 , A _B2 , A _B3 has a line hydraulic pressure PL corresponding to a clutch hydraulic pressure (in response to a command signal from the electronic control unit 100 by linear solenoid valves SL1 to SL5). (Engagement hydraulic pressure) P _C1 , P _C2 , P _B1 , P _B2 , P _B3 are regulated and supplied directly. The line pressure PL, for example, as the clutch torque (engagement torque, torque capacity) of the friction engagement device for transmitting an output torque (engine torque) T _E of the engine 30 is engagement hydraulic pressure is secured obtained The throttle valve opening θ _TH or the amount of intake air is controlled by, for example, a relief type pressure regulating valve (regulator valve) (not shown) with the hydraulic pressure generated from a mechanical oil pump 28 (see FIG. 1) rotated by the engine 30 as a source pressure. It adapted to be pressure adjusted to a value corresponding to the engine torque T _E for Q or the like.

The linear solenoid valves SL1 to SL5 have basically the same configuration, and are excited and de-energized independently by the electronic control unit 100, and the hydraulic pressure of each hydraulic actuator A _C1 , A _C2 , A _B1 , A _B2 , A _B3 . Are independently controlled to control the engagement hydraulic pressures P _C1 , P _C2 , P _B1 , P _B2 , and P _{B3 of} the clutches C1 and C2 and the brakes B1 to B3. In the automatic transmission 10, for example, as shown in the engagement operation table of FIG. 2, each gear stage is established by engaging a predetermined friction engagement device. Further, in the shift control of the automatic transmission 10, for example, clutch-to-clutch shift is performed by re-engaging the disengagement side frictional engagement device and the engagement side frictional engagement device of the clutch C and brake B involved in the shift. . During this clutch-to-clutch shift, the release transition hydraulic pressure of the release side frictional engagement device and the engagement side frictional engagement device are engaged so that the shift is executed as quickly as possible while suppressing the shift shock. Transient oil pressure is properly controlled.

  FIG. 5 is a functional block diagram illustrating a main part of a control function by the electronic control device 100 for solving the above-described problem. In FIG. 5, the shift control means 102 obtains the actual vehicle speed V and the accelerator opening Acc from the relationship (map, shift diagram) stored in advance with the vehicle speed V and the accelerator opening Acc as variables, for example, as shown in FIG. Based on the shift determination, it is determined whether or not the shift of the automatic transmission 10 should be executed, for example, the gear stage to be shifted of the automatic transmission 10 is determined, and the automatic shift is performed so that the determined gear stage is obtained. The automatic shift control of the machine 10 is executed. At this time, the shift control means 102 engages and / or releases the hydraulic friction engagement device involved in the shift of the automatic transmission 10 so that the gear stage is achieved in accordance with, for example, the engagement table shown in FIG. A command (shift output, hydraulic command) is output to the hydraulic control circuit 50. In the shift diagram of FIG. 6, the solid line is a shift line (upshift line) for determining an upshift, and the broken line is a shift line (downshift line) for determining a downshift.

  For example, the speed change control means 102 increases the vehicle speed V due to an acceleration operation in which the accelerator pedal 52 is depressed while the vehicle is running with the automatic transmission 10 in the second gear, and the vehicle state is changed to the second speed → When it is determined that the second speed → third speed upshift line that should perform the third speed upshift is crossed, the engagement hydraulic pressure of the brake B1 serving as the disengagement side frictional engagement device is decreased to start the release of the brake B1. At the same time, the engagement hydraulic pressure of the brake B3 as the engagement side frictional engagement device is increased to start the engagement of the brake B3 so that the decrease in the torque capacity of the brake B1 and the increase in the torque capacity of the brake B3 overlap. A 2 → 3 power-on upshift command for shifting from the gear ratio γ2 of the second speed gear stage to the gear ratio γ3 of the third speed gear stage by completing the release of B3 and the engagement of the clutch C2 is hydraulically controlled. To the control circuit 50.

The hydraulic control circuit 50 operates the linear solenoid valves SL1 to SL5 in the hydraulic control circuit 50 so that the shift of the automatic transmission 10 is executed according to the shift output from the shift control means 102, and is involved in the shift. The hydraulic actuators A _C1 , A _C2 , A _B1 , A _B2 , A _B3 of the hydraulic friction engagement device are operated.

  The travel range determination unit 104 determines the travel range based on the position of the shift lever 72 of the shift device 71. For example, when the shift lever 72 is positioned at the “D” position or the “S” position, the travel range determination unit 104 determines that the automatic transmission 10 is in the forward travel range that allows forward travel. When the shift lever 72 is positioned at the “R” position, the travel range determination unit 104 determines that the automatic transmission 10 is in the reverse travel range that allows reverse travel. When the shift lever 72 is positioned at the “N” position, the travel range determination unit 104 determines that the automatic transmission 10 is in the non-travel range. When the shift lever 72 is positioned at the “P” position, the travel range determination unit 104 determines that the automatic transmission 10 is in the complete non-travel range. Here, both the “N” position and the “P” position correspond to the non-traveling range, but when the shift lever 72 is in the “P” position, the output gear 24 of the automatic transmission 10 is mechanically locked and the vehicle speed V In this embodiment, the “P” position is distinguished from the “N” position as a complete non-running range. In the “N” position, the power transmission of the automatic transmission 10 is interrupted, that is, the engine 30 is in a neutral state where the output of the engine 30 is not input to the automatic transmission 10, but the vehicle speed V is not necessarily zero. For example, when the “N” position is selected during traveling of the vehicle, the vehicle is caused to travel by the inertial force of the vehicle even when the automatic transmission 10 is in the neutral state.

  The travel range determination means 104 not only determines the travel range based on the position of the shift lever 72 but also switches the travel range from the “R” position (reverse travel range) to the “N” position (non-travel range), for example, When a travel range switching operation such as a travel range switch from the “N” position (non-travel range) to the “D” position (travel range) is performed, the travel range switching operation is similarly determined.

By the way, for example, during reverse travel, the driver may make a sudden start to forward travel. As shown in FIG. 7, when the driver wishes to travel forward during reverse travel (1) R travel), the driver switches the shift lever 72 to the “N” position at one end so that the automatic transmission 10 is in the neutral state. It becomes. At this time, even if the automatic transmission 10 is in the neutral state, the vehicle is moved backward at a predetermined vehicle speed V by the inertial force of the vehicle (2) backward movement. Then, along with the request for sudden acceleration, that the driver depresses the accelerator pedal 52, it is the engine 30 is allowed racing the engine rotational speed N _E is increased (3) N racing). Then, when the driver shifts the shift lever 72 from the “N” position to the “D” position and switches the travel range (4) normal shift (N → D)), the vehicle travels forward (5) D. Traveling).

Here, when the driver switches from the “N” position (non-traveling range) to the “D” position (traveling range), the output of the engine 30 rotating at a high rotational speed suddenly increases the input shaft of the automatic transmission 10. 22, a high input torque is generated in each rotary member of the drive system (the automatic transmission 10, the differential gear unit 34, the axle 38, etc.), and the durability of each rotary member of the drive system is reduced. There was a possibility. On the other hand, in the conventional control, the high input torque generation is suppressed by controlling the engagement speed of the friction engagement device that is engaged when the forward gear stage of the automatic transmission 10 is established. Specifically, when the non-travel range is switched to the forward travel range, the automatic transmission 10 establishes the forward gear (usually the first gear), but the shift control means 102 establishes the forward gear. The engagement speed of the friction engagement device (clutch C1 in the case of the first speed gear stage) that is sometimes engaged is reduced. Thereby, since rapid torque input to the drive system is suppressed, generation of high input torque is suppressed. Further, the generation of high input torque is also suppressed by performing the control for limiting the output of the engine 30 by limiting the throttle valve opening _θTH .

  The conventional control is performed in the region of a relatively low vehicle speed V. As shown in FIG. 6, the vehicle speed V1 corresponds to the downshift line from the second speed gear stage to the first speed gear stage. If this is the case, the shift control of the automatic transmission 10 is performed, and interference due to the shift control of the automatic transmission 10 may occur. Therefore, the high input torque due to the decrease in the engagement speed of the friction engagement device, which is the conventional control, It was difficult to suppress. Therefore, no effective means for preventing the generation of high input torque has been found in the region where the vehicle speed V exceeds the predetermined value V1. Normally, even when the vehicle is traveling backwards, the vehicle speed is detected as an absolute value, and thus there is a possibility that interference due to the shift control occurs similarly.

On the other hand, the racing suppression means 106 suppresses racing by limiting the output torque of the engine 30 in advance when the automatic transmission 10 is switched to the non-traveling range when changing to forward traveling during reverse traveling. Suppresses the generation of high input torque when switched to the forward travel range (eg, “D” position). Specifically, the racing suppression means 106 sets the accelerator opening Acc, which is the depression amount (operation amount) of the accelerator pedal 52 by the driver when the vehicle is switched to the non-traveling range (“N” position) during reverse traveling. The throttle valve opening θ _TH of the electronic throttle valve 62 controlled accordingly is limited. For example, racing suppression means 106 stores the upper limit value N _{E 1} of the engine rotational speed N _E which is set in advance, even depressed large accelerator pedal 52, the engine rotational speed N _E is an upper limit value N _E The throttle valve opening θ _TH is controlled so as not to exceed 1. Therefore, regardless of the accelerator opening Acc, which is the depression amount of the accelerator pedal 52, the throttle valve opening _θTH is limited, so that the engine output is limited and racing is suppressed. By the racing suppressing means 106 is implemented, because the lowered engine rotational speed N _E and the inertial force due to the rotation of the engine 30 is reduced, the drive system (automatic transmission 10, differential gear device 34, the axle 38 Etc.) is prevented from generating high input torque. The upper limit N _{E 1} of the engine rotational speed N _E is determined by experiment in advance and calculate the input torque to the driving system is set to the rotation rate such that the suppressed when switching to a forward drive range.

  Here, in this embodiment, the racing suppression means 106 is limited to be implemented only in a region where the vehicle speed V during reverse running is equal to or greater than a predetermined value A. As shown in FIG. 8, an area in which the vehicle speed V is equal to or greater than a predetermined value A during reverse travel (reverse travel) is the operating range of the racing suppression means 106. The predetermined value A is set to a speed lower than the vehicle speed V1 at which the shift control is performed and in the vicinity thereof. In other words, the racing suppression means 106 is set to be implemented in a region where there is a possibility of interference with the shift control.

Racing suppressing means 106 for suppressing the high input torque generated by limiting the rotational speed N _E according to restrict the engine output, the upper limit value N _{E 1} is set to a low value. Therefore, it is disadvantageous to the startability (startup response) when switching to the forward travel range (such as “D” position).

On the other hand, when the vehicle speed V is less than the predetermined value A, as described above, the generation of high input torque can be suppressed by controlling the engagement speed of the friction engagement device of the automatic transmission 10. the upper limit of the engine rotation speed N _E even if that limit together the output torque of the engine 30 is may be a large set. Therefore, if the vehicle speed V is less than the predetermined value A, the starting control (starting response) is superior to that when the racing suppression means 106 is implemented, and the conventional control is advantageous.

  From the above, the racing suppression means 106 is limited to the time when the vehicle is traveling backward and the vehicle speed V is equal to or higher than the predetermined value A, and the conventional control is performed when the vehicle speed V is less than the predetermined value A and when traveling forward. Even when the vehicle speed V is equal to or higher than the predetermined value A, generation of high input torque to the drive system is suppressed, and a decrease in start response at the time of switching to the forward travel range is suppressed.

Returning to FIG. 5, the vehicle speed determination means 108 determines whether or not the vehicle speed V of the vehicle is equal to or greater than a predetermined value A set in advance. The vehicle speed V is calculated based on the rotational speed N _OUT of the output gear 24 detected by the output speed sensor 66. Here, it is desirable that the predetermined value A is less than the vehicle speed V1 at which the shift control is started in FIG. That is, the predetermined value A selects which of the conventional controls for controlling the engagement speed of the racing restraining means 106 and the frictional engagement device is to be performed as the control means when suppressing the generation of the high input torque. Functions as a threshold.

  The reverse travel determination means 110 determines whether or not the traveling direction of the vehicle is the reverse direction (reverse direction) when in the non-traveling range (“N” position). For example, when the output rotational speed sensor 66 can also detect the rotational direction, the traveling direction of the vehicle is based on the rotational direction signal (traveling direction signal) output from the rotational speed sensor 66. It is determined whether or not. Further, for example, it may be determined whether the vehicle is traveling backward based on an acceleration signal from an acceleration sensor, navigation information by GPS, a previous shift operation, or the like.

When it is determined based on the vehicle speed determination means 108 and the reverse travel determination means 110 that the vehicle is traveling backward (reverse travel) and the vehicle speed V is greater than or equal to the predetermined value A, the racing suppression means 106 is The racing is suppressed as the engine speed _NE is limited.

The clutch engagement determination means 112 determines whether or not the friction engagement device that is engaged when the automatic transmission 10 forms the forward gear is started. For example, the clutch engagement determination unit 112 is configured to change the relative rotational speed between the friction engagement devices engaged when switching to the forward travel range (the clutch C1 in the case of the first speed gear stage) and the friction engagement device. Based on the hydraulic pressure or the like, it is determined whether or not the friction engagement device to be engaged has started to bring out the torque capacity. When the clutch engagement determination unit 112 is affirmed, the racing suppression unit 106 is stopped, and the shift control unit 102 outputs the throttle valve opening degree θ _TH according to the depression amount of the accelerator pedal 52. At this time by gradually increasing the upper limit value N _{E 1} of the engine rotational speed N _E, it is desirable to implement a gradual controlled to increase the throttle valve opening theta _TH.

  FIG. 9 is a flowchart for explaining the main part of the control operation of the electronic control unit 100, that is, the control operation that can suppress the generation of a high input torque to the drive system in the sudden start in the forward direction after the vehicle is traveling backward. For example, it is repeatedly executed with an extremely short cycle time of about several milliseconds to several tens of milliseconds. In this flowchart, it is assumed that the non-running range is selected, that is, the shift lever 72 is operated to the “N” position.

  First, in step SA1 (hereinafter, step is omitted) corresponding to the vehicle speed determination means 108 and the reverse travel determination means 110, whether or not the vehicle is traveling backward and the vehicle speed V is equal to or higher than a predetermined value A. Is determined. If SA1 is negative, this routine is terminated. When SA1 is denied, that is, when the vehicle speed V is less than the predetermined value A or when the vehicle travels forward, the non-traveling range is switched to the forward traveling range (such as the “D” position). Conventional racing suppression control is performed by clutch engagement control of a friction engagement device (for example, clutch C1) and engine output limitation. Specifically, the high input torque is suppressed by lowering the clutch engagement speed than usual.

  When SA1 is positive, in SA2 corresponding to the clutch engagement determining means 112, the engagement of the friction engagement device (for example, the clutch C1) that is engaged when the automatic transmission 10 is switched to the forward travel range is engaged. It is determined whether or not the torque capacity has been started. In SA2, instead of the above determination, the travel range determination means 104 determines whether or not the non-travel range (“N” position) has been switched to the forward travel range (“D” position, etc.). It may be determined whether or not the engagement of the engagement device is started.

If SA2 is negative in SA3 corresponding to the racing suppressing means 106, so that the engine rotational speed N _E is limited to the upper limit value N _{E 1,} irrespective of the accelerator opening Acc, the throttle valve of the electronic throttle valve 62 The opening θ _TH is limited. On the other hand, when SA2 is affirmed, the friction engagement device of the automatic transmission 10 is engaged, and therefore SA4 corresponding to the shift control means 102 is performed when the non-traveling range is selected (when step SA2 is negative). as the optionally has the engine rotational speed N _E restrictions are gradually relaxed, the throttle valve opening theta _TH of the electronic throttle valve 62 is gradually increased.

  FIG. 10 is a time chart for explaining an operation state based on the control operation of the electronic control device 100, and corresponds to the flowchart of FIG. FIG. 10 shows an operating state from a state where the vehicle speed V is traveling backward at a predetermined value A or higher in the non-traveling range (“N” position).

At time t1, when the accelerator pedal 52 is depressed, the accelerator opening Acc indicated by the solid line increases, but the throttle valve opening θ _TH indicated by the alternate long and short dash line is determined by the racing suppression means 106 being implemented. , And is maintained at zero (corresponding to step SA3 in FIG. 9). The above is the throttle valve opening theta _TH is maintained at zero in order to reduce the engine rotational speed N _E. Next, when the driver switches from the non-traveling range (“N” position) to the forward traveling range (“D” position, etc.) at time t2, the clutch engagement determination means 112 is affirmed (SA2 in FIG. 9). Equivalent). Then, after a predetermined time delay, the engagement control of the friction engagement device of the automatic transmission 10 is started at time t3. At this time, the racing suppression means 106 is also stopped, and the throttle valve opening θ _TH is gradually increased according to the accelerator opening Acc (corresponding to SA4 in FIG. 9).

Here, when the engagement control of the friction engagement device of the automatic transmission 10 is started, an input torque is generated to the drive system. For example, the racing suppression control (racing suppression means 106) indicated by a solid line is not performed ( Without control), a high input torque is generated and the load on the drive system becomes large. On the other hand, when the racing suppression control (racing suppression means 106) indicated by the alternate long and short dash line is performed (with control), the generated input torque is reduced as the engine speed _NE is decreased. Therefore, the load related to the drive system is reduced.

  As described above, according to this embodiment, the racing suppression means is only when the vehicle is traveling backward while the automatic transmission 10 is in the non-traveling range and the vehicle speed V is equal to or greater than the predetermined value A. Therefore, even if the automatic transmission 10 is switched to the forward travel range, it is suitably prevented that a high input torque is applied to the drive system. For example, when the vehicle speed V is less than the predetermined value A, the shift control of the automatic transmission 10 is not executed. Therefore, when the automatic transmission 10 is switched from the non-travel range to the forward travel range, the automatic shift is performed. By the clutch engagement control of the machine 10 and the rotational speed control of the engine 30, control for suppressing generation of high input torque applied to the drive system at the time of forward travel range switching is performed. However, when the vehicle speed V exceeds the predetermined value A, interference with the shift control of the automatic transmission 10 occurs, making the control difficult. On the other hand, if the automatic transmission 10 is implemented with the racing suppression means 106 that suppresses the racing by limiting the engine output regardless of the depression of the accelerator pedal 52 in the non-traveling range, the automatic transmission 10 travels forward. Generation of high input torque when the range is switched is suppressed. Since the racing suppression means 106 is implemented in a state where it is switched to the non-traveling range, there is a problem that the startability (starting response) when switched to the forward travel range is lowered. Therefore, by limiting the implementation of the racing suppression means 106 only when the vehicle is traveling backward and the vehicle speed V is equal to or higher than the predetermined value A, the influence on general traveling such as startability is suppressed. can do.

  In addition, according to the present embodiment, when the vehicle speed V of the vehicle is less than the predetermined value A and when the vehicle is traveling forward, the racing suppression means 106 is not implemented, so that the influence of the racing suppression means can be reduced. it can. For example, if the vehicle speed V is less than the predetermined value A, the shift control of the automatic transmission 10 is not performed. Therefore, a high input torque is generated by the clutch engagement control of the automatic transmission 10 for switching to the forward travel range. It becomes possible to implement control to suppress the above. Specifically, the generation of high input torque applied to the drive system is suppressed by reducing the clutch engagement speed. Here, when the racing suppression means 106 is implemented in a region where the vehicle speed V is equal to or less than the predetermined value A, the vehicle starts from a state where the output of the engine 30 is limited, and the vehicle startability (startup response) at the time of forward travel is obtained. May be reduced. Therefore, when the vehicle speed V is less than the predetermined value A, the conventional control is performed, and the racing suppression means 106 is performed only when the vehicle speed V during reverse traveling is equal to or higher than the predetermined value A. Generation of high input torque can be suppressed while reducing the influence on running.

Further, according to the present embodiment, the racing suppression means 106 limits the throttle valve opening degree θ _TH with respect to the depression of the accelerator pedal 52, so that the racing suppression means 106 is switched from the non-traveling range to the forward traveling range. However, since the engine output is limited by limiting the throttle valve opening degree θ _TH and the engine rotational speed _NE is suppressed, generation of high input torque to the drive system is preferably prevented.

Further, according to this embodiment, when the automatic transmission 10 is switched to the forward travel range during the execution of the racing suppression means, the racing suppression means 106 is stopped, and the throttle valve opening θ _TH corresponding to the accelerator opening Acc. Therefore, the limitation on the engine output is released, and the decrease in response due to the racing suppression means 106 can be suppressed to the minimum.

  Further, according to the present embodiment, the predetermined value A of the vehicle speed V is set to a speed lower than the vehicle speed at which the shift control of the automatic transmission 10 is started. Since interference due to the shift control of the transmission 10 does not occur, generation of a high input torque to the drive system by the clutch engagement control of the automatic transmission 10 is suppressed. At this time, control for limiting the engine output may also be performed.

  According to the present embodiment, when the vehicle speed V is less than the predetermined value A, when the automatic transmission 10 is switched from the non-traveling range to the traveling range, the automatic transmission 10 is switched to the automatic transmission 10 by the engagement control. Therefore, the generation of high input torque to the drive system including the automatic transmission 10 is suppressed.

  As mentioned above, although the Example of this invention was described in detail based on drawing, this invention is applied also in another aspect.

  For example, although the automatic transmission 10 of the above-described embodiment is a transmission that achieves six forward speeds and one reverse speed, the number of shift stages and the connection relationship of the automatic transmission 10 are not particularly limited. Specifically, the present invention can be applied to the automatic transmission 10 as long as the automatic transmission 10 has an engagement device capable of connecting and disconnecting a power transmission path from the engine 30 to the drive wheel 40. The present invention can also be applied to a belt type continuously variable transmission.

In the illustrated embodiment, at the time of implementation of the racing suppression means 106, it is set the upper limit value N _{E 1} of the engine rotational speed N _E, the throttle valve opening theta _TH is controlled so as not to exceed the upper limit value N _{E 1} However, for example, an upper limit value of the throttle valve opening _θTH may be set and controlled so as not to exceed the upper limit value.

  The above description is only an embodiment, and the present invention can be implemented in variously modified and improved forms based on the knowledge of those skilled in the art.

10: Automatic transmission (automatic transmission for vehicles)
30: Engine 40: Driving wheel 52: Accelerator pedal 106: Racing suppression means Acc: Accelerator opening θ _TH : Throttle valve opening V: Vehicle speed

Claims (6)

An automatic transmission provided in a power transmission path between the engine and the drive wheels, and a racing suppression means for suppressing racing by limiting the engine output regardless of the depression of the accelerator pedal when the automatic transmission is in a non-traveling range. A control device for a vehicle power transmission device comprising:
The vehicular power transmission device is characterized in that the racing suppression means is implemented only when the vehicle is traveling backward while the automatic transmission is in a non-traveling range and the vehicle speed is equal to or higher than a predetermined value. Control device.   2. The control device for a vehicle power transmission device according to claim 1, wherein the racing suppression unit is not executed when the vehicle speed of the vehicle is less than a predetermined value and when the vehicle is traveling forward.   3. The control device for a vehicle power transmission device according to claim 1, wherein the racing suppression means limits a throttle valve opening relative to an accelerator opening corresponding to a depression amount of an accelerator pedal.   2. When the automatic transmission is switched to a forward travel range while the racing suppression means is being implemented, the racing suppression means is stopped and the throttle valve opening is increased according to the accelerator opening. The control apparatus of the power transmission device for vehicles any one of thru | or 3.   5. The control device for a vehicle power transmission device according to claim 1, wherein the predetermined value of the vehicle speed is set to a speed lower than the vehicle speed at which the shift control of the automatic transmission is performed.   When the vehicle speed is less than a predetermined value, when the automatic transmission is switched from the non-traveling range to the traveling range, the input torque to the automatic transmission is suppressed by the engagement control of the automatic transmission. A control device for a vehicle power transmission device according to any one of claims 1 to 5.

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