Vehicle control device, vehicle control method, and program

Abstract

[Problem] To reduce discomfort given to a driver due to the difference between an acceleration request of the driver and the acceleration of a vehicle when a sailing stop state is canceled. [Solution] A vehicle control device that transmits driving force input from an engine to drive wheels via a continuously variable transmission mechanism, wherein if an accelerator is not depressed during travel, fuel supply to the engine is stopped and a clutch between the engine and the drive wheels is disengaged to put the vehicle into a first travel state, and when the accelerator is depressed during travel in the first travel state, the engine is started and the clutch is engaged to increase hydraulic pressure supplied to a pulley, and the timing at which the hydraulic pressure supplied to the pulley increases due to the accelerator being depressed during travel in the first travel state is later than the timing at which the hydraulic pressure supplied to the pulley increases due to the accelerator being further depressed when the vehicle is not in the first travel state.

Description

[Technical field]

[0001] The present invention relates to a vehicle control device, a vehicle control method, and a program. [Background technology]

[0002] Patent Document 1 discloses an automatic engine start / stop device which automatically stops the engine when the required torque becomes small relative to the running resistance while the engine is operating, controls the starting clutch to be released when certain requirements are met after the engine has automatically stopped, automatically starts the engine when the required torque becomes large relative to the running resistance while the engine is automatically stopped and the starting clutch is released, and controls the starting clutch to be connected when clutch engagement conditions are met during automatic engine start. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 07-266932 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the automatic start / stop device of Patent Document 1, the acceleration of the vehicle is delayed in response to an acceleration request from the driver, which may cause the driver to feel uncomfortable.

[0005] The present invention has been made in consideration of the above-mentioned problems, and aims to reduce the discomfort felt by the driver due to the discrepancy between the driver's acceleration request and the vehicle acceleration when canceling the sailing stop state (first driving state). [Means for solving the problem]

[0006] According to one aspect of the present invention, there is provided a vehicle control device that controls a vehicle in which driving force input from an engine is transmitted to drive wheels via a continuously variable transmission mechanism consisting of a pair of pulleys and an endless member wrapped around the pulleys, and which increases the oil pressure supplied to the pulleys when the accelerator pedal is depressed further.When the accelerator pedal is not depressed while the vehicle is traveling, fuel supply to the engine is stopped and the clutch between the engine and the drive wheels is released to enter a first driving state, and when the accelerator pedal is depressed while the vehicle is traveling in the first driving state, the engine is started and the clutch is engaged to increase the oil pressure supplied to the pulleys, and the timing at which the oil pressure supplied to the pulleys increases as a result of the accelerator pedal being depressed while the vehicle is traveling in the first driving state is delayed compared to the timing at which the oil pressure supplied to the pulleys increases as a result of the accelerator being depressed further when the vehicle is not in the first driving state.

[0007] According to another aspect of the present invention, there is provided a vehicle control device for controlling a vehicle that transmits a driving force input from an engine to a driving wheel via a continuously variable transmission mechanism composed of a pair of pulleys and an endless member that is engaged around the pulleys, and when an accelerator pedal is not depressed while the vehicle is traveling, a second traveling state is entered in which the supply of fuel to the engine is stopped and the engine is rotated by the driving force transmitted from the driving wheels to the engine, and when the accelerator pedal is depressed while the vehicle is traveling in the second traveling state, the supply of fuel to the engine is resumed and the hydraulic pressure supplied to the pulley is increased, and when the accelerator pedal is not depressed while the vehicle is traveling, the supply of fuel to the engine is resumed and the hydraulic pressure supplied to the pulley is increased When a predetermined condition is satisfied, fuel supply to the engine is stopped and a clutch between the engine and the drive wheels is released to enter a first driving state, and when the accelerator is depressed while driving in the first driving state, the engine is started and the clutch is engaged to increase the oil pressure supplied to the pulley, and the timing at which the oil pressure supplied to the pulley increases as a result of the accelerator being depressed while driving in the first driving state is delayed compared to the timing at which the oil pressure supplied to the pulley increases as a result of the accelerator being further depressed while driving in the second driving state. Effect of the Invention

[0008] According to the above aspect, it is possible to reduce the sense of discomfort felt by the driver due to a discrepancy between the driver's acceleration request and the acceleration of the vehicle when the first traveling state is released. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic configuration diagram of a vehicle equipped with a vehicle control device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a configuration block diagram showing the controller and main components connected to the controller. [Diagram 3] FIG. 3 is a flowchart showing the process of canceling the first traveling state performed by the control device. [Figure 4]FIG. 4 is a timing chart of an example of the process of canceling the first running state performed by the control device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] A transmission control device, a transmission control method, and a program according to an embodiment of the present invention (hereinafter referred to as the present embodiment) will be described below with reference to the attached drawings. In the following, a large gear ratio is referred to as Low, and a small gear ratio is referred to as High. In addition, a shift of the gear ratio to the Low side is referred to as a downshift, and a shift of the gear ratio to the High side is referred to as an upshift.

[0011] First, a vehicle 100 to which an automatic transmission 20 as a transmission according to this embodiment is applied will be described with reference to Figures 1 and 2. Figure 1 is a schematic configuration diagram of the vehicle 100 equipped with a controller 30 as a control device for the vehicle 100 according to the embodiment of the present invention. Figure 2 is a configuration block diagram showing the controller 30 and the main components connected to the controller 30.

[0012] As shown in FIG. 1, a vehicle 100 includes an engine 10 as a drive source, an automatic transmission 20, a torque converter 2 provided between the engine 10 and the automatic transmission 20, and a controller 30.

[0013] The torque converter 2 is provided with a lock-up clutch 2a. The lock-up clutch 2a is engaged when the vehicle 100 is traveling at or above a predetermined lock-up vehicle speed. When the lock-up clutch 2a is engaged, an input shaft 2b as an input element of the torque converter 2 and an output shaft 2c as an output element are directly connected, and the input shaft 2b and the output shaft 2c rotate at the same speed. Therefore, when the lock-up clutch 2a is engaged, the rotation of the output shaft 10a of the engine 10 is transmitted as is from the output shaft 2c of the torque converter 2 to the automatic transmission 20.

[0014] The automatic transmission 20 includes a forward / reverse switching mechanism 3 as a power transmission mechanism, a variator 4 as a continuously variable transmission mechanism, a hydraulic control circuit 5, and an oil pump 6.

[0015] In the vehicle 100, rotation generated by the engine 10 is transmitted to drive wheels 50 via a torque converter 2, a forward / reverse switching mechanism 3, a variator 4, a gear set 7, and a differential gear device 8.

[0016] The forward / reverse switching mechanism 3 has a double pinion planetary gear set as its main component, with its sun gear coupled to the engine 10 via the torque converter 2 and its carrier coupled to the input shaft 4d (primary pulley 4a) of the variator 4. The forward / reverse switching mechanism 3 further includes a forward clutch (FWD / C) 3a as a clutch that directly connects the sun gear and carrier of the double pinion planetary gear set, and a reverse brake 3b (REV / B) that fixes the ring gear, and when the forward clutch 3a is engaged, the input rotation from the engine 10 via the torque converter 2 is transmitted as is to the primary pulley 4a, and when the reverse brake 3b is engaged, the input rotation from the engine 10 via the torque converter 2 is reversed, reduced in speed, and transmitted to the primary pulley 4a.

[0017] The variator 4 is a continuously variable transmission mechanism that changes the speed of the rotation of the engine 10 transmitted to the input shaft 4d and transmits it from the output shaft 4e to the drive wheels 50. The variator 4 includes a primary pulley 4a provided on the engine 10 side in a power transmission path, a secondary pulley 4b provided on the drive wheels 50 side, and a belt 4c as an endless member wound around the primary pulley 4a and the secondary pulley 4b. In the vehicle 100, the driving force input from the engine 10 is transmitted to the drive wheels 50 via the variator 4 that is configured of a pair of pulleys 4a, 4b and the belt 4c wound around the pulleys 4a, 4b.

[0018] In the variator 4, the oil pressure supplied to the primary pulley 4a and the oil pressure supplied to the secondary pulley 4b are controlled to change the contact radius between each of the pulleys 4a, 4b and the belt 4c, thereby changing the gear ratio. In the variator 4, when an accelerator pedal 41, which will be described later, is depressed further, the oil pressure supplied to the pulleys 4a, 4b is increased.

[0019] The oil pump 6 is a mechanical oil pump that receives the rotation of the engine 10 and is driven by utilizing a portion of the power of the engine 10. The oil discharged from the oil pump 6 is supplied to the hydraulic control circuit 5.

[0020] The hydraulic control circuit 5 includes a regulator valve 5a that adjusts the pressure of the hydraulic oil supplied from the oil pump 6 to generate the required hydraulic pressure, a primary solenoid valve 5b that adjusts the hydraulic pressure supplied to the primary pulley 4a, a secondary solenoid valve 5c that adjusts the hydraulic pressure supplied to the secondary pulley 4b, a lock-up solenoid valve 5d that adjusts the hydraulic pressure supplied to the lock-up clutch 2a, a select solenoid valve 5e that adjusts the hydraulic pressure supplied to the forward clutch 3a and the hydraulic pressure supplied to the reverse brake 3b, and a manual valve 5f that switches the supply path of the hydraulic pressure to the forward clutch 3a and the reverse brake 3b.

[0021] The hydraulic control circuit 5 supplies adjusted hydraulic pressure to each of the torque converter 2 , the forward / reverse switching mechanism 3 , and the variator 4 based on a control signal from the controller 30 .

[0022] The controller 30 is composed of a microcomputer equipped with a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), and input / output interfaces (I / O interfaces) 31, 32 (see FIG. 2). The CPU reads and executes programs stored in the ROM to perform various processes in the controller 30. The controller 30 can also be composed of a plurality of microcomputers. Specifically, the controller 30 can also be composed of an ATCU (automatic transmission control unit) that controls the automatic transmission 20, an SCU (shift control unit) that controls the shift range, an ECU (engine control unit) that controls the engine 10, and the like. The controller 30 controls the hydraulic control circuit 5, the engine 10, and the starter motor 11 (see FIG. 2) based on signals output from various sensors 60 and the like.

[0023] The controller 30 controls the rotation speed ENGREV of the engine 10 (hereinafter also referred to as the engine rotation speed ENGREV), engine torque, the engagement state of the lock-up clutch 2a, the gear ratio of the variator 4, the engagement state of the forward clutch 3a and the reverse brake 3b, etc., based on signals from various sensors 60 that detect the state of each part of the vehicle 100.

[0024] The controller 30 receives inputs of signals from an accelerator opening sensor 61 which detects an accelerator pedal opening APO corresponding to the amount of operation of the accelerator pedal 41, a signal from a brake fluid pressure sensor 62 which detects a brake fluid pressure BRP corresponding to the amount of operation of the brake pedal 42, a signal from an inhibitor switch 63 which detects the position of the shifter 43, a signal from a turbine rotation speed sensor 64 which detects the rotation speed TBNREV of the output shaft 2c of the torque converter 2, a signal from a primary rotation speed sensor 65 which detects the rotation speed PRIREV of the input shaft 4d (primary pulley 4a) of the variator 4, a signal from a secondary rotation speed sensor 66 which detects the rotation speed SECREV of the output shaft 4e (secondary pulley 4b) of the variator 4, a signal from a primary oil pressure sensor 67 which detects the primary oil pressure Pp supplied to the primary pulley 4a, a signal from a secondary oil pressure sensor 68 which detects the secondary oil pressure Ps supplied to the secondary pulley 4b, and a signal from an engine rotation speed sensor 69 which detects the engine rotation speed ENGREV.

[0025] In this embodiment, the controller 30 is capable of executing idling stop control, which automatically stops the engine 10 when certain conditions are met while the vehicle 100 is stopped; coasting stop control, which stops the supply of fuel to the engine 10 and releases the forward clutch 3a between the engine 10 and the drive wheels 50 when the vehicle 100 is coasting and there is a high possibility that the vehicle will enter idling stop control if it is stopped; and sailing stop control, which stops the supply of fuel to the engine 10 while the vehicle 100 is traveling and releases the forward clutch 3a between the engine 10 and the drive wheels 50.

[0026] The controller 30 executes coast stop control to stop the engine 10 when a predetermined condition (predetermined condition: when the lockup clutch 2a is released, the accelerator pedal 41 is not depressed, the brake pedal 42 is depressed, and the vehicle speed is lower than a predetermined speed) is satisfied during coasting (coast stop state), and when a predetermined condition is satisfied after the vehicle 100 is stopped, the controller 30 shifts from the coast stop control to the idling stop control (idling stop state). In addition, when the accelerator pedal 41 is not depressed during traveling and a predetermined condition (predetermined condition: when the lockup clutch 2a is engaged, the brake pedal 42 is depressed, and the vehicle speed is lower than a predetermined speed (higher than the vehicle speed for coast stop)) is satisfied, the controller 30 executes sailing stop control to stop the fuel supply to the engine 10 and release the forward clutch 3a between the engine 10 and the drive wheels 50 (sailing stop state: first traveling state).

[0027] 2, the controller 30 includes an input interface 31, an output interface 32, a memory unit 33, a determination unit 34, a hydraulic control circuit control unit (hereinafter simply referred to as the "circuit control unit") 36, an engine control unit 37, and a starter motor control unit 38, which are electrically connected to each other. The memory unit 33, the determination unit 34, the circuit control unit 36, the engine control unit 37, and the starter motor control unit 38 are virtual units that serve as the functions of the controller 30 for controlling the vehicle 100, and do not represent physical entities.

[0028] To the input interface 31, output signals from various sensors 60 are input.

[0029] The storage unit 33 is a memory for temporarily storing output signals from the various sensors 60. The storage unit 33 also stores processing programs and algorithm programs executed in the circuit control unit 36, the engine control unit 37, and the starter motor control unit 38. In this embodiment, the storage unit 33 is built into the controller 30, but is not limited to this. For example, the storage unit 33 may be provided separately from the controller 30.

[0030] The determination unit 34 performs various determinations based on the output signals output from the various sensors 60, and outputs the results of the various determinations to the circuit control unit 36, the engine control unit 37, or the starter motor control unit 38.

[0031] The circuit control unit 36 ​​generates a circuit control command based on the output signals output from the various sensors 60, and outputs the generated circuit control command to the hydraulic control circuit 5 via the output interface 32. The circuit control unit 36 ​​has a variator control module 361, a forward clutch control module 362, and a reverse brake control module 363.

[0032] The variator control module 361 generates a variator control command based on output signals output from the various sensors 60, and outputs the generated variator control command to the hydraulic control circuit 5 via the output interface 32. By receiving a supply of oil from the hydraulic control circuit 5, the contact radius between each of the pulleys 4a, 4b and the belt 4c is changed, and the gear ratio is changed.

[0033] The forward clutch control module 362 generates a clutch control command based on output signals output from the various sensors 60, and outputs the generated clutch control command to the hydraulic control circuit 5 via the output interface 32. By receiving a supply of oil from the hydraulic control circuit 5, the forward clutch 3a is switched between engagement and release.

[0034] The reverse brake control module 363 generates a brake control command based on the output signals output from the various sensors 60, and outputs the generated brake control command to the hydraulic control circuit 5 via the output interface 32. The reverse brake 3b is switched between engagement and release by receiving a supply of oil from the hydraulic control circuit 5.

[0035] The engine control unit 37 generates an engine control command based on output signals output from the various sensors 60, and outputs the generated engine control command to the engine 10 via the output interface 32.

[0036] The starter motor control unit 38 generates a starter motor control command based on output signals output from the various sensors 60 , and outputs the generated starter motor control command to the starter motor 11 via the output interface 32 .

[0037] Next, a sailing stop state release process performed by the controller 30 will be described with reference to Fig. 3. Fig. 3 is a diagram showing, in a flowchart, the sailing stop state release process performed by the controller 30. This sailing stop state release process is repeatedly executed by the controller 30 at regular time intervals.

[0038] As described above, in the variator 4, when the accelerator pedal 41 is depressed further, the oil pressure supplied to the pulleys 4a, 4b is increased. When the oil pressure is increased, the amount of oil leaking from the gaps between the components increases. This reduces the amount of oil in the circuit, delaying the timing of shifting the variator 4 to the low side and engaging the forward clutch 3a, which may cause the driver to feel uncomfortable due to a discrepancy between the driver's acceleration request and the acceleration of the vehicle 100. Therefore, the vehicle 100 executes a process for releasing the sailing stop state shown in FIG. 3.

[0039] In step S11, the controller 30 determines whether the vehicle 100 is traveling in a sailing stop state. If it is determined in step S11 that the vehicle 100 is traveling in a sailing stop state, the process proceeds to step S12. On the other hand, if it is determined in step S11 that the vehicle 100 is not traveling in a sailing stop state, the process of step S11 is repeated.

[0040] In step S12, the controller 30 determines whether or not the accelerator pedal 41 has been operated by the driver and the accelerator has been turned on. Specifically, the controller 30 detects the accelerator pedal opening APO based on a signal input from the accelerator opening sensor 61, and determines whether or not the accelerator pedal 41 has been operated. If it is determined in step S12 that the accelerator has been turned on, the process proceeds to step S13. On the other hand, if it is determined in step S12 that the accelerator has not been turned on, that is, that the accelerator pedal 41 has not been operated and the accelerator remains off, the process of step S12 is repeated.

[0041] That is, this flow is started when the vehicle 100 is traveling in a sailing stop state (determination of "Yes" in step S11) and the driver operates the accelerator pedal 41 to turn the accelerator on (determination of "Yes" in step S12).

[0042] In step S13, the controller 30 drives the starter motor 11 to rotate and turns on the engine 10.

[0043] In step S14, the controller 30 starts engaging the forward clutch 3a. Specifically, the controller 30 sends an electric signal to the hydraulic control circuit 5 to supply oil to the pressure chamber of the forward clutch 3a.

[0044] The processes in steps S13 and S14 may be executed simultaneously or in the reverse order.

[0045] In step S15, it is determined whether or not a predetermined time has elapsed. If it is determined in step S15 that the predetermined time has elapsed, the process proceeds to step S16. On the other hand, if it is determined in step S15 that the predetermined time has not elapsed, the process of step S15 is repeated. This predetermined time is set longer than the time required for pre-charging, in which oil for engaging the forward clutch 3a is filled into the hydraulic chamber, so that the process proceeds to step S16 after pre-charging. Pre-charging is a control in which the command pressure is increased in a stepped manner to the pre-charge pressure for a predetermined time at the start of clutch engagement control, and then reduced to the predetermined pressure.

[0046] In this way, the timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed during sailing stop is a predetermined time after the supply of oil for engaging the forward clutch 3a starts. Specifically, the timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed during sailing stop is after the pre-charge that fills the oil chamber with oil for engaging the forward clutch 3a.

[0047] In step S16, the controller 30 sends an electric signal to the hydraulic control circuit 5 to increase the command pressure of the oil supplied to the secondary pulley 4b. The controller 30 sends an electric signal to the hydraulic control circuit 5 to simultaneously increase the command pressure of the oil supplied to the primary pulley 4a.

[0048] When the accelerator pedal 41 is not operated, the torque to be transmitted is small, and the pressure of the oil supplied to the pulleys 4a and 4b is therefore reduced. In contrast, in step S16, the pressure of the oil supplied to the pulleys 4a and 4b is increased in advance before the accelerator pedal 41 is operated to increase the torque to be transmitted.

[0049] In step S17, the controller 30 downshifts the gear ratio of the variator 4 to a low gear ratio. By downshifting the gear ratio of the variator 4 to a low gear ratio before the engagement of the forward clutch 3a is completed, the vehicle 100 can be accelerated quickly after the forward clutch 3a is engaged.

[0050] In step S18, the controller 30 completes the engagement of the forward clutch 3a, so that the forward clutch 3a has a transmission torque capacity.

[0051] Next, the sailing stop state release process performed by the controller 30 will be specifically described with reference to Fig. 4. Fig. 4 is a timing chart of an example of the sailing stop state release process performed by the controller 30.

[0052] In FIG. 4, the horizontal axis represents time T [sec], and the vertical axis represents accelerator pedal opening APO, primary pulley rotation speed (PRIREV: solid line) [rpm], turbine rotation speed (TBNREV: dashed line) [rpm], engine rotation speed (ENGREV: dashed dotted line) [rpm], engine torque (ENG torque: solid line) [N·m], primary pulley torque (PRI torque: dashed line) [N·m], command pressure for forward clutch 3a (FWD / C command pressure), command pressure for secondary pulley 4b (SEC command pressure), and the gear ratio of variator 4.

[0053] In the example shown in Fig. 4, at time T0, the driver no longer operates the accelerator pedal 41, and the accelerator is released. As a result, the primary pulley rotation speed PRIREV, the turbine rotation speed TBNREV, and the engine rotation speed ENGREV begin to decrease. Furthermore, the secondary pulley command pressure also begins to decrease because the torque transmitted becomes smaller. Also, at time T0, the supply of fuel to the engine 10 is stopped (fuel cut state).

[0054] At time T1, the command pressure of the forward clutch 3a becomes 0. As a result, the forward clutch 3a is gradually released from the engaged state. That is, the transmission torque capacity of the forward clutch 3a is gradually reduced.

[0055] At time T2, the forward clutch 3a is released and the transmission torque capacity of the forward clutch 3a becomes 0. At this time, the vehicle 100 continues coasting, so the primary pulley rotation speed PRIREV is maintained. Meanwhile, since the forward clutch 3a is released, both the turbine rotation speed TBNREV and the engine rotation speed ENGREV start to decrease.

[0056] At time T3, the engine 10 stops because the supply of fuel is stopped, the forward clutch 3a is released, and the rotation of the drive wheels 50 is no longer transmitted, so that the engine 10 stops. That is, the turbine rotation speed TBNREV and the engine rotation speed ENGREV both become 0. As a result, the vehicle 100 enters a sailing stop state.

[0057] At time T4, the driver operates the accelerator pedal 41 to turn the accelerator on. This starts the process of releasing the sailing stop state. That is, when the accelerator pedal 41 is depressed in the sailing stop state, the fuel supply to the engine 10 is resumed to start the engine 10, and the forward clutch 3a is engaged to increase the hydraulic pressure supplied to the pulleys 4a and 4b.

[0058] Between time T4 and time T5, pre-charge is performed and the supply of oil to the hydraulic chamber of the forward clutch 3a is started. That is, pre-charge is performed in which the magnitude of the engagement hydraulic pressure supplied to the forward clutch 3a is increased from the release hydraulic pressure to the state before the forward clutch 3a starts to engage.

[0059] At time T5, the precharge ends and the command pressure drops. Between time T5 and time T8, oil is supplied to the hydraulic chamber of the forward clutch 3a at a command pressure lower than that during precharge. At time T8, the forward clutch 3a is brought into contact with the oil supplied to the hydraulic chamber. That is, before time T8 is reached, the forward clutch 3a is in a state in which the input side friction transmission member and the output side friction transmission member are not in contact with each other and there is still no transmission torque capacity. At time T8, the input side friction transmission member and the output side friction transmission member of the forward clutch 3a come into contact with each other. In this way, the control until the forward clutch 3a moves from the completely released state to the contact state is also called backlash reduction control, and the precharge is a part of the backlash reduction control. Immediately after this friction transmission member moves from the non-contact state to the contact state (the time when the backlash reduction control is completed), that is, at the moment when the friction transmission member comes into contact, there is no transmission torque capacity. By further supplying hydraulic pressure to the hydraulic chamber from this state, the transmission torque capacity increases.

[0060] Between time T8 and time T10, the pressure of the oil supplied to the hydraulic chamber of the forward clutch 3a increases to the engagement hydraulic pressure. That is, the transmission torque capacity of the forward clutch 3a gradually increases from a zero state.

[0061] On the other hand, at time T6, which is a predetermined time after time T4, the secondary pulley command pressure increases. As a result, the hydraulic pressure supplied to the secondary pulley 4b increases. The timing at which the hydraulic pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed when the sailing stop state is reached is later than the timing at which the hydraulic pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed further when the sailing stop state is not reached.

[0062] In this way, the timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed during sailing stop is delayed compared to the timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed further during non-sailing stop, so that the amount of oil leaking due to the increase in oil pressure during re-acceleration from the sailing stop state can be reduced and the amount of oil in the circuit can be increased. This allows the timing of shifting to the low side and engagement of the forward clutch 3a to be advanced. Therefore, the vehicle 100 can be accelerated quickly in response to an acceleration request, so that the discomfort felt by the driver due to the discrepancy between the driver's acceleration request and the acceleration of the vehicle 100 can be reduced.

[0063] In addition, when the accelerator pedal 41 is not depressed while the vehicle 100 is traveling, the vehicle is in a coasting state (second traveling state) in which fuel supply to the engine 10 is stopped and the engine 10 is rotated by the driving force transmitted from the drive wheels 50 to the engine 10. When the accelerator pedal 41 is depressed in this coasting state, fuel supply to the engine 10 is resumed and the oil pressure supplied to the pulleys 4a, 4b is increased (immediately after the accelerator pedal 41 is depressed). At this time, the timing at which the oil pressure supplied to the pulleys 4a, 4b is increased by depressing the accelerator pedal 41 in the sailing stop state is later than the timing at which the oil pressure supplied to the pulleys 4a, 4b is increased by further depressing the accelerator pedal 41 in the coasting state. For example, when the accelerator pedal 41 is depressed in the coasting state, the oil pressure supplied to the pulleys 4a, 4b is increased immediately after the accelerator pedal 41 is depressed in order to respond to the driver's request for acceleration. On the other hand, the timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed during a sailing stop state is delayed compared to the timing at which the oil pressure increases during a coasting state, because the oil pressure supplied to the pulleys 4a, 4b is increased after the pre-charge pressure supplied to the forward clutch 3a drops after it is detected that the accelerator pedal 41 has been depressed.

[0064] In this way, the timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed in the sailing stop state is delayed compared to the timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed further in the coasting state, so that the amount of oil leaking due to the increase in oil pressure during re-acceleration from the sailing stop state can be reduced and the amount of oil in the circuit can be increased. This allows the timing of shifting to the low side and the engagement of the forward clutch 3a to be advanced. Therefore, the vehicle 100 can be accelerated quickly in response to an acceleration request, so that the discomfort felt by the driver due to the discrepancy between the driver's acceleration request and the acceleration of the vehicle 100 can be reduced.

[0065] In addition, since the hydraulic pressure supplied to the pulleys 4a and 4b becomes high after the pre-charge, the pre-charge, which requires a large amount of oil, can be performed while the amount of oil leakage due to the increase in hydraulic pressure is small. This allows the timing of engagement of the forward clutch 3a to be advanced. Therefore, the vehicle 100 can be accelerated quickly in response to an acceleration request, so that the discomfort felt by the driver due to the discrepancy between the acceleration request of the driver and the acceleration of the vehicle 100 can be reduced.

[0066] Between time T7 and time T9, a downshift is performed to increase the gear ratio of the variator 4. That is, when the accelerator pedal 41 is depressed in a sailing stop state, a downshift is performed to increase the gear ratio, and then the forward clutch 3a is engaged.

[0067] In this way, since the forward clutch 3a is engaged after a downshift, the amount of oil available for gear shifting increases, and the reduction ratio can be increased quickly. Also, the gear shift is quicker because the forward clutch 3a is not engaged during the gear shift, so the acceleration of the vehicle 100 after the forward clutch 3a is engaged can be improved, and the discomfort felt by the driver when accelerating again can be reduced.

[0068] At time 10, the forward clutch 3a is in an engaged state (fully engaged state). Therefore, the engine torque and the primary pulley torque increase in conjunction with each other. This completes the process of releasing the sailing stop state performed by the controller 30.

[0069] The configuration and effects of the present embodiment will now be described.

[0070] (1)(6)(8) The driving force input from the engine 10 is transmitted to the driving wheels 50 via a variator 4 consisting of a pair of pulleys 4a, 4b and a belt 4c wound around the pulleys 4a, 4b. When the accelerator pedal 41 is depressed, the hydraulic pressure supplied to the pulleys 4a, 4b is increased. When the accelerator pedal 41 is no longer depressed while the vehicle is traveling, the vehicle control device (controller 30) stops the fuel supply to the engine 10 and releases the forward clutch 3a between the engine 10 and the driving wheels 50 to start sailing. In the case where the accelerator pedal 41 is depressed while traveling in the sailing stop state (first traveling state), the engine 10 is started and the forward clutch 3a is engaged to increase the oil pressure supplied to the pulleys 4a, 4b, and the timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed while traveling in the sailing stop state is later than the timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being further depressed when the vehicle is not in the sailing stop state.

[0071] According to this configuration, the timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed during a sailing stop state is delayed compared to the timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed further during a state other than a sailing stop state. This reduces the amount of oil leaking due to the increase in oil pressure during re-acceleration from the sailing stop state, and increases the amount of oil in the circuit. This allows the timing of shifting to the low side and the engagement of the forward clutch 3a to be advanced. Therefore, the vehicle 100 can be accelerated quickly in response to an acceleration request, thereby reducing the discomfort felt by the driver due to the discrepancy between the driver's acceleration request and the acceleration of the vehicle 100.

[0072] (2) When the accelerator pedal 41 is depressed while the vehicle is traveling in a sailing stop state, the vehicle control device (controller 30) performs a downshift to increase the gear ratio (reduction ratio) and then engages the forward clutch 3a.

[0073] According to this configuration, the forward clutch 3a is engaged after a downshift, so the amount of oil available for gear shifting increases, and the reduction ratio can be increased quickly. Also, the forward clutch 3a is not engaged during gear shifting, so gear shifting is quicker, and the acceleration of the vehicle 100 after the forward clutch 3a is engaged can be improved, and the discomfort felt by the driver during re-acceleration can be reduced.

[0074] (3)(4) In the vehicle control device (controller 30), the timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed while the vehicle is traveling in a sailing stop state is a predetermined time after the supply of oil for engaging the forward clutch 3a begins. Specifically, in the vehicle control device (controller 30), the timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed while the vehicle is traveling in a sailing stop state is after a pre-charge in which the oil chamber is filled with oil for engaging the forward clutch 3a.

[0075] According to this configuration, the hydraulic pressure supplied to the pulleys 4a, 4b after the pre-charge is high, so that the pre-charge, which requires a large amount of oil, can be performed while the amount of oil leakage due to the increase in hydraulic pressure is small. This allows the timing of engagement of the forward clutch 3a to be advanced. Therefore, the vehicle 100 can be accelerated quickly in response to an acceleration request, so that the discomfort felt by the driver due to the discrepancy between the acceleration request of the driver and the acceleration of the vehicle 100 can be reduced.

[0076] (5)(7)(9) A vehicle control device (controller 30) for controlling a vehicle 100 that transmits a driving force input from an engine 10 to driving wheels 50 via a variator 4 formed of a pair of pulleys 4a, 4b and a belt 4c wound around the pulleys 4a, 4b, stops the supply of fuel to the engine 10 when an accelerator pedal 41 is not depressed while the vehicle is traveling, and sets the engine 10 to a coasting state (second traveling state) in which the engine 10 is rotated by the driving force transmitted from the driving wheels 50 to the engine 10, and when the accelerator pedal 41 is depressed while the vehicle is traveling in the coasting state, resumes the supply of fuel to the engine 10 and increases the hydraulic pressure supplied to the pulleys 4a, 4b, so as to maintain the engine 10 in a state in which the accelerator pedal 41 is not depressed while the vehicle is traveling. When the engine 10 is not in a sailing stop state and a specified condition is met, the fuel supply to the engine 10 is stopped and the forward clutch 3a between the engine 10 and the drive wheels 50 is released to enter a sailing stop state (first running state), and if the accelerator pedal 41 is depressed while running in the sailing stop state, the engine 10 is started and the forward clutch 3a is engaged to increase the oil pressure supplied to the pulleys 4a, 4b. The timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed while running in the sailing stop state is delayed compared to the timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being further depressed in the coasting state.

[0077] According to this configuration, the timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed in the sailing stop state is delayed compared to the timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed further in the coasting state, so that the amount of oil leaking due to the increase in oil pressure during re-acceleration from the sailing stop state can be reduced and the amount of oil in the circuit can be increased. This allows the timing of shifting to the low side and the engagement of the forward clutch 3a to be advanced. Therefore, the vehicle 100 can be accelerated quickly in response to an acceleration request, so that the discomfort felt by the driver due to the discrepancy between the driver's acceleration request and the acceleration of the vehicle 100 can be reduced.

[0078] An embodiment of the present invention has been described above, but the above embodiment merely illustrates one application example of the present invention, and is not intended to limit the technical scope of the present invention to the specific configuration of the above embodiment.

[0079] The series of processes in the automatic transmission 20 described above may be provided as a program for execution by a computer.

[0080] That is, the program according to this embodiment instructs the computer to stop the supply of fuel to the engine 10 and release the forward clutch 3a between the engine 10 and the drive wheels 50 to set the sailing stop state (first running state) when the accelerator pedal 41 is not depressed while the vehicle is running, and to start the engine 10 and engage the forward clutch 3a to increase the oil pressure supplied to the pulleys 4a, 4b when the accelerator pedal 41 is depressed while the vehicle is running in the sailing stop state, so that the timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed while the vehicle is running in the sailing stop state is later than the timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed further when the vehicle is not in the sailing stop state, or to stop the supply of fuel to the engine 10 and rotate the engine 10 by the driving force transmitted from the drive wheels 50 to the engine 10 when the accelerator pedal 41 is not depressed while the vehicle is running. When the accelerator pedal 41 is depressed while the vehicle is traveling in the coasting state, fuel supply to the engine 10 is resumed and the oil pressure supplied to the pulleys 4a, 4b is increased. When the accelerator pedal 41 is not depressed while the vehicle is traveling and a predetermined condition is met, fuel supply to the engine 10 is stopped and the forward clutch 3a between the engine 10 and the drive wheels 50 is released to enter a sailing stop state (first traveling state). When the accelerator pedal 41 is depressed while the vehicle is traveling in the sailing stop state, the engine 10 is started and the forward clutch 3a is engaged to increase the oil pressure supplied to the pulleys 4a, 4b. The timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being depressed while the vehicle is traveling in the sailing stop state is later than the timing at which the oil pressure supplied to the pulleys 4a, 4b increases as a result of the accelerator pedal 41 being further depressed while the vehicle is traveling in the coasting state.

[0081] The program for executing the above-described series of processes is provided by a computer-readable storage medium. In the controller 30, the program may be stored in the storage unit 33.

[0082] Furthermore, the various programs executed by the computer may be stored in a non-transitory recording medium such as a CD-ROM. [Explanation of symbols]

[0083] 100 vehicles 3a Forward clutch (clutch) 4 Variator (continuously variable transmission) 4a Primary pulley (pulley) 4b Secondary pulley (pulley) 4c Belt (endless member) 10 Engine 20 Automatic transmission (transmission) 30 Controller (vehicle control device, computer) 41 Accelerator pedal (accelerator) 50 Drive wheels

Claims

1. A control device for a vehicle that transmits a driving force input from an engine to a driving wheel via a continuously variable transmission mechanism composed of a pair of pulleys and an endless member wrapped around the pulleys, and increases a hydraulic pressure supplied to the pulleys when an accelerator pedal is depressed, when the accelerator pedal is not depressed during driving, the supply of fuel to the engine is stopped and a clutch between the engine and the drive wheels is released to set a first driving state; When the accelerator is depressed while the vehicle is traveling in the first traveling state, the engine is started and the clutch is engaged to increase the hydraulic pressure supplied to the pulley, a timing at which the oil pressure supplied to the pulley increases as a result of the accelerator being depressed while the vehicle is traveling in the first traveling state is later than a timing at which the oil pressure supplied to the pulley increases as a result of the accelerator being depressed further when the vehicle is not in the first traveling state; Vehicle control device.

2. The vehicle control device according to claim 1, When the accelerator is depressed while the vehicle is traveling in the first traveling state, a downshift is performed to increase the gear ratio, and then the clutch is engaged. Vehicle control device.

3. The vehicle control device according to claim 1 or 2, a timing when the oil pressure supplied to the pulley becomes high as a result of the accelerator being depressed while the vehicle is traveling in the first traveling state is a predetermined time after the supply of oil for engaging the clutch is started. Vehicle control device.

4. The vehicle control device according to claim 3, The timing at which the hydraulic pressure supplied to the pulley becomes high as a result of the accelerator being depressed while the vehicle is traveling in the first traveling state occurs after a pre-charge in which oil for engaging the clutch is filled into a hydraulic chamber. Vehicle control device.

5. A vehicle control device that controls a vehicle that transmits a driving force input from an engine to a driving wheel via a continuously variable transmission mechanism that is configured with a pair of pulleys and an endless member that is wrapped around the pulleys, when the accelerator pedal is not depressed during driving, a second driving state is entered in which fuel supply to the engine is stopped and the engine is rotated by a driving force transmitted from the drive wheels to the engine; When the accelerator is depressed while the vehicle is traveling in the second traveling state, fuel supply to the engine is resumed and the oil pressure supplied to the pulley is increased, when the accelerator pedal is not depressed during traveling and a predetermined condition is satisfied, the supply of fuel to the engine is stopped and a clutch between the engine and the drive wheels is released to set the vehicle in a first traveling state; When the accelerator is depressed while the vehicle is traveling in the first traveling state, the engine is started and the clutch is engaged to increase the hydraulic pressure supplied to the pulley, a timing at which the oil pressure supplied to the pulley increases as a result of the accelerator being depressed while the vehicle is traveling in the first traveling state is later than a timing at which the oil pressure supplied to the pulley increases as a result of the accelerator being depressed further while the vehicle is traveling in the second traveling state; Vehicle control device.

6. A method for controlling a vehicle in which a driving force input from an engine is transmitted to a driving wheel via a continuously variable transmission mechanism composed of a pair of pulleys and an endless member wrapped around the pulleys, and when an accelerator pedal is depressed further, a hydraulic pressure supplied to the pulleys is increased, when the accelerator pedal is not depressed during driving, the supply of fuel to the engine is stopped and a clutch between the engine and the drive wheels is released to set a first driving state; When the accelerator is depressed while the vehicle is traveling in the first traveling state, the engine is started and the clutch is engaged to increase the hydraulic pressure supplied to the pulley, a timing at which the oil pressure supplied to the pulley increases as a result of the accelerator being depressed while the vehicle is traveling in the first traveling state is later than a timing at which the oil pressure supplied to the pulley increases as a result of the accelerator being depressed further when the vehicle is not in the first traveling state; How to control a vehicle.

7. A method for controlling a vehicle that transmits a driving force input from an engine to a driving wheel via a continuously variable transmission mechanism that is configured with a pair of pulleys and an endless member that is wrapped around the pulleys, comprising: when the accelerator pedal is not depressed during driving, a second driving state is entered in which fuel supply to the engine is stopped and the engine is rotated by a driving force transmitted from the drive wheels to the engine; When the accelerator is depressed while the vehicle is traveling in the second traveling state, fuel supply to the engine is resumed and the oil pressure supplied to the pulley is increased, when the accelerator pedal is not depressed during traveling and a predetermined condition is satisfied, the supply of fuel to the engine is stopped and a clutch between the engine and the drive wheels is released to set the vehicle in a first traveling state; When the accelerator is depressed while the vehicle is traveling in the first traveling state, the engine is started and the clutch is engaged to increase the hydraulic pressure supplied to the pulley, a timing at which the oil pressure supplied to the pulley increases as a result of the accelerator being depressed while the vehicle is traveling in the first traveling state is later than a timing at which the oil pressure supplied to the pulley increases as a result of the accelerator being depressed further while the vehicle is traveling in the second traveling state; How to control a vehicle.

8. A program executable by a computer to control a vehicle in which a driving force input from an engine is transmitted to a driving wheel via a continuously variable transmission mechanism composed of a pair of pulleys and an endless member wrapped around the pulleys, and when an accelerator pedal is depressed, a hydraulic pressure supplied to the pulleys is increased, when the accelerator pedal is not depressed during driving, the supply of fuel to the engine is stopped and a clutch between the engine and the drive wheels is released to set a first driving state; When the accelerator is depressed while the vehicle is traveling in the first traveling state, the engine is started and the clutch is engaged to increase the hydraulic pressure supplied to the pulley, a timing at which the oil pressure supplied to the pulley increases as a result of the accelerator being depressed while the vehicle is traveling in the first traveling state is later than a timing at which the oil pressure supplied to the pulley increases as a result of the accelerator being depressed further when the vehicle is not in the first traveling state; A program that causes the computer to execute the procedure.

9. A program executable by a computer to control a vehicle that transmits a driving force input from an engine to a driving wheel via a continuously variable transmission mechanism that is configured with a pair of pulleys and an endless member that is wrapped around the pulleys, when the accelerator pedal is not depressed during driving, a second driving state is entered in which fuel supply to the engine is stopped and the engine is rotated by a driving force transmitted from the drive wheels to the engine; When the accelerator is depressed while the vehicle is traveling in the second traveling state, fuel supply to the engine is resumed and the oil pressure supplied to the pulley is increased, when the accelerator pedal is not depressed during driving and a predetermined condition is satisfied, the supply of fuel to the engine is stopped and a clutch between the engine and the drive wheels is released to set the vehicle in a first driving state; When the accelerator is depressed while the vehicle is traveling in the first traveling state, the engine is started and the clutch is engaged to increase the hydraulic pressure supplied to the pulley, a timing at which the oil pressure supplied to the pulley increases as a result of the accelerator being depressed while the vehicle is traveling in the first traveling state is later than a timing at which the oil pressure supplied to the pulley increases as a result of the accelerator being depressed further while the vehicle is traveling in the second traveling state; A program that causes the computer to execute the procedure.

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