JP2016183715A - Vehicle control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle control device for reducing the occurrence of shocks at the time of performing a gear change.SOLUTION: A vehicle control device comprises: a coast control start execution unit 51 for releasing a clutch 11 and dropping an engine speed, when a predetermined coast control starting condition is satisfied, to start a coast control; and a coast control finish execution unit 52 for restricting the execution of the termination processing of a coast control to raise an engine rotation number and to apply the clutch 11 after the start of the coast control until the elapse of a predetermined time period.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle control apparatus, and more particularly, to coasting control that intercepts power transmission between an engine and drive wheels and causes the vehicle to coast.

  Conventionally, when the vehicle is running, the clutch is disengaged or the transmission is neutralized to cut off the power transmission between the engine and the drive wheels, and during that time, the engine speed is reduced to reduce the fuel The coasting control that reduces the consumption of water is known.

  In a vehicle that performs such coasting control, various techniques for shifting are disclosed (see, for example, Patent Document 1 and Patent Document 2).

JP2012-031942A JP 2012-031944 A

  For example, in a vehicle that performs coasting control, when a predetermined coasting control end condition is satisfied, the engine speed is increased, the clutch is engaged, and coasting control is terminated. In addition, in a vehicle, there is a possibility that the gear is shifted artificially or automatically after the coasting control is finished. In this case, the clutch is disengaged again, the gear stage is changed, and the clutch is engaged. It will be.

  For example, immediately after starting coasting control, the coasting control end condition is satisfied, and immediately after that, shifting may be performed. In this case, the coasting control is terminated when the coasting control end condition is satisfied, and the clutch is engaged, so that a state where torque is applied between the clutch and the gear is maintained. For this reason, a shock is generated when the clutch is disengaged again for shifting, or when the gear before shifting is removed.

  An object of the present invention is to provide a vehicle control device capable of reducing the occurrence of shock when performing a gear shift.

  In order to achieve the above object, a vehicle control apparatus according to an aspect of the present invention starts coasting control by disengaging the clutch and lowering the engine speed when satisfying a predetermined coasting control start condition. Coasting control start execution means, coasting control end execution means for limiting the execution of coasting control end processing for increasing the engine speed and bringing the clutch into contact until a predetermined time has elapsed since the start of coasting control; Have

  In the vehicle control device, the coasting control end execution means does not determine whether a predetermined coasting control end condition, which is a condition for executing coasting control end processing, is satisfied until a predetermined time has elapsed after the start of coasting control. It may be.

  In the vehicle control device, the coasting control end execution means starts coasting control even when it detects that the predetermined coasting control termination condition, which is a condition for executing coasting control termination processing, is satisfied. You may make it wait for execution of the end process of coasting control until predetermined time passes.

  In the vehicle control apparatus, the predetermined time may be equal to or longer than a time until the clutch is completely disengaged by the coasting control start execution means.

  The vehicle control apparatus may further include a shift execution unit that switches to a predetermined shift stage before the engagement of the clutch by the coasting control end execution unit is executed.

  According to the vehicle control device of the present invention, it is possible to reduce the occurrence of a shock when performing a shift.

1 is a schematic overall configuration diagram showing a vehicle according to an embodiment of the present invention. It is a functional block diagram which shows the electronic control unit and related structure which concern on one Embodiment of this invention. It is a flowchart of the vehicle control process which concerns on one Embodiment of this invention. It is a timing chart of control by the vehicle control device concerning a conventional example. It is a timing chart of control by the vehicle control device concerning one embodiment of the present invention.

  Hereinafter, based on an accompanying drawing, a vehicle control device concerning one embodiment of the present invention is explained. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  FIG. 1 is a schematic overall configuration diagram showing a vehicle 1 according to the present embodiment. The output shaft of the engine 10 is connected to the input shaft of the transmission 12 via the clutch 11. The output shaft of the transmission 12 is connected to drive wheels (left and right rear wheels) 16L and 16R via a propeller shaft 13, a differential device 14, and a drive shaft 15, respectively.

  The clutch 11 connects and disconnects a power transmission path between the output shaft of the engine 10 and the input shaft of the transmission 12. In the present embodiment, the clutch 11 connects and disconnects the power transmission path according to the hydraulic pressure supplied from the hydraulic control device 18. The hydraulic control device 18 generates hydraulic pressure to be supplied to the clutch 11 using the driving force of the engine 10.

  The transmission 12 is, for example, an automatically controlled manual transmission (AMT).

  The vehicle 1 includes left and right front wheels 17L and 17R, an engine speed sensor 20, a vehicle speed sensor 21, an accelerator pedal sensor 22, a brake pedal sensor 23, and an electronic control unit (hereinafter referred to as an ECU) 50 as an example of a vehicle control device. .

  The engine speed sensor 20 detects the speed Ne of a crankshaft (not shown) of the engine 10. The vehicle speed sensor 21 detects the traveling speed VT of the vehicle 1 from the rotational speed of the propeller shaft 13. The accelerator pedal sensor 22 detects the accelerator opening Q from the depression amount of the accelerator pedal 31. The brake pedal sensor 23 detects the presence or absence of a brake operation by the driver from the amount of depression of the brake pedal 32. The sensor values of these various sensors 20 to 23 are transmitted to the electrically connected ECU 50.

  The ECU 50 performs various controls of the engine 10, the clutch 11, the transmission 12, the hydraulic control device 18, and the like, and includes a known CPU, ROM, RAM, input port, output port, and the like.

  FIG. 2 is a functional block diagram showing an electronic control unit and related configurations according to an embodiment of the present invention.

  The ECU 50 includes a coasting control start execution unit 51 as an example of coasting control start execution means, a coasting control end execution unit 52 as an example of coasting control end execution means, and a shift execution unit 53 as an example of shift execution means. As part of functional elements. In the present embodiment, these functional elements are described as being included in the ECU 50, which is an integral piece of hardware. However, any one of these functional elements may be provided in separate hardware.

  The coasting control start execution unit 51 determines whether or not a predetermined coasting control start condition is satisfied based on the input sensor value. As the coasting control start condition, for example, the accelerator opening may be decreased by a predetermined amount or more. The coasting control start condition is not limited to this, and may be various conditions. For example, the coasting control start condition corresponds to an operation state in which the engine 10 with respect to one or more sensor values does not perform positive work on the drive wheels. It is good also as conditions.

  The coasting control start execution unit 51 starts coasting control when determining that the coasting control start condition is satisfied. That is, the coasting control start execution unit 51 performs control to reduce the rotational speed of the engine 10 to a predetermined rotational speed (for example, a rotational speed lower than the normal rotational speed of the engine 10 (when the vehicle is stopped)), and Control is performed so that the clutch 11 is disengaged by the hydraulic control device 18.

  The coasting control end execution unit 52 determines whether or not a predetermined coasting control end condition is satisfied based on the input sensor value. As the coasting control end condition, for example, the accelerator opening may be increased by a predetermined amount or more. The coasting control end condition is not limited to this, and can be various conditions. For example, the driving state in which the engine 10 with respect to one or more sensor values does not perform positive work on the drive wheels is eliminated. It is good also as conditions which show that.

  When the coasting control end execution unit 52 determines that the coasting control end condition is satisfied, the coasting control end process, that is, the rotational speed of the engine 10 is adjusted to the rotational speed of the in-shaft of the transmission 12, for example. While performing the control to raise, the process which controls the clutch control part 52 to make the clutch 11 contact is performed.

  The coasting control end execution unit 52 limits the execution of the coasting control end process until a predetermined time (also referred to as the shortest duration) elapses after the coasting control start execution unit 51 starts coasting control. Here, the shortest duration may be equal to or longer than the time until the clutch 11 is completely disengaged by the control by the coasting control start execution unit 51. In the present embodiment, the coasting control end execution unit 52 does not perform the determination as to whether or not the coasting control end condition is satisfied until the shortest duration has elapsed since the coasting control start execution unit 51 started the coasting control. By doing so, the execution of coasting control end processing is restricted. The coasting control end condition is determined before the coasting control is started before the minimum duration has elapsed, and coasting control end processing is performed after the minimum duration has elapsed. Thus, execution of coasting control end processing may be limited.

  The shift execution unit 53 determines the target shift stage based on the accelerator opening from the accelerator pedal sensor 22 and the vehicle speed from the vehicle speed sensor 21. As a method for determining the target shift speed, for example, a shift map that prescribes a suitable shift speed corresponding to the accelerator opening and the vehicle speed is stored in the shift execution unit 53 in advance, and the accelerator opening from the accelerator pedal sensor 22 is stored. In addition, there is a method of identifying an optimum shift stage by referring to a shift map based on the vehicle speed from the vehicle speed sensor 21 and determining the optimum shift stage as a target shift stage. The method for determining the target shift speed is not limited to this, and any method can be used. Further, a shift speed corresponding to an operation of a shift lever (not shown) by the driver of the vehicle 1 may be set as the target shift speed.

  The shift execution unit 53 performs control to switch the shift stage of the transmission 12 when the current shift stage is different from the determined target shift stage. In the present embodiment, when it is detected that the current shift speed is different from the determined target shift speed during the shortest duration, the coasting control end execution unit 52 executes the clutch contact control. Before starting, control to change the gear position is performed. In this case, since the clutch is already disengaged during the shortest duration, it is not necessary to disengage the clutch again for the control to switch the gear position. For this reason, there is no shock that occurs when the clutch is disengaged from the clutch-engaged state and the gear position is released. As a result, the occurrence of shock at the time of shifting can be reduced.

  Next, a vehicle control process according to an embodiment of the present invention will be described.

  FIG. 3 is a flowchart of a vehicle control process according to an embodiment of the present invention.

  This vehicle control process is started, for example, simultaneously with the start of the engine 10 (key switch ON of the ignition switch).

  The coasting control start execution unit 51 determines whether the state of the vehicle matches the coasting control start condition (S10). As a result, when the state of the vehicle does not match the coasting control start condition, the coasting control start execution unit 51 repeats the process of step S10 (S10: NO).

  On the other hand, when the state of the vehicle matches the coasting control start condition (S10: YES), the coasting control start execution unit 51 starts coasting control (S11). Specifically, the coasting control execution unit 51 performs control to reduce the rotational speed of the engine 10 to a predetermined rotational speed (for example, a rotational speed lower than the idle rotational speed of the engine 10), and controls the hydraulic control device 18. Control is performed so that the clutch 11 is disengaged. As a result, fuel consumption in the engine 10 can be appropriately reduced.

  Next, the coasting control end execution unit 52 determines whether or not a predetermined time (shortest duration) has elapsed since the coasting control was started (S12). As a result, when the shortest duration has not elapsed (S12: NO), the coasting control end execution unit 52 maintains the coasting control state and repeats the process of step S12.

  On the other hand, when the shortest duration has elapsed (S12: YES), the coasting control end execution unit 52 determines whether the state of the vehicle matches the coasting control end condition (S13). As a result, when the state of the vehicle does not match the coasting control end condition (S13: NO), the coasting control end execution unit 52 maintains the state of coasting control and repeats the process of step S13.

  On the other hand, when the state of the vehicle matches the coasting control end condition (S13: YES), coasting control end execution unit 52 shifts control to execution of the shift process by shift execution unit 53. In this case, when the shift execution unit 53 detects that the current shift stage is different from the determined target shift stage during the shortest duration, the shift execution unit 53 performs control to switch the shift stage, and then performs control. The process returns to the coasting control end execution unit 52 (S14). At this time, the clutch 11 is completely disconnected, so that almost no shock is generated when the gear position is changed. If the current shift speed is not different from the determined target shift speed, the shift execution section 53 immediately returns control to the coasting control end execution section 52.

  The coasting control end execution unit 52, when the control is returned from the shift execution unit 53, performs coasting control end processing (S15). In the coasting control end process, the coasting control end execution unit 52 starts control to increase the rotational speed of the engine 10 to match, for example, the rotational speed of the in-shaft of the transmission 12, and 11 is controlled to contact. As a result, the clutch 11 is engaged in a state where the transmission 12 is at the target shift stage.

  Next, the effect by the vehicle control apparatus which concerns on one Embodiment of this invention is demonstrated.

  FIG. 4 is a timing chart of control by the vehicle control apparatus according to the conventional example. FIG. 5 is a timing chart of control by the vehicle control device according to the embodiment of the present invention.

  In the vehicle control apparatus according to the conventional example, when coasting control is started at time T0, control is started so as to disengage the clutch 11. Here, at the time T1 immediately after the coasting control is started, it is assumed that the state of the vehicle matches the coasting control end condition, and the shift execution unit 53 sets the target gear stage (target gear) to 3 It is assumed that the speed is changed from 2nd speed.

  At time T1, the clutch 11 is not completely disconnected.

  In this case, a process for immediately ending coasting control is performed. That is, the process for engaging the clutch 11 is started.

  At time T2, the clutch 11 is completely engaged and the target gear stage has changed, and it is necessary to shift. Therefore, control for disengaging the clutch 11 is started from that point, and at time T3, the clutch 11 is completely disengaged. It will be a refusal. At time T2, torque is generated in the clutch 11 by connecting the engine 10 and the drive wheels. When the clutch 11 is disengaged, a shock is generated due to the influence of this torque. In addition, when the shift stage is started at a time point (before time T3) when the clutch 11 is not completely disengaged, a shock occurs when the shift stage is pulled out.

  The control for engaging the clutch 11 is started from the time when switching of the shift speed is completed (time T3), and at time T4, the clutch is completely engaged and the shift is completed.

  Thus, in the vehicle control device according to the conventional example, a shock is generated at the time of a shift immediately after the coasting control is finished.

  On the other hand, in the vehicle control device according to the present embodiment, when coasting control is started at time T0, control for disengaging the clutch 11 is started. Here, at the time T1 immediately after the coasting control is started, it is assumed that the state of the vehicle matches the coasting control end condition, and the shift execution unit 53 sets the target gear stage (target gear) to 3 It is assumed that the speed is changed from 2nd speed.

  In the vehicle control device according to the present embodiment, until the time T5 when the shortest duration has elapsed from the time T0 at which the coasting control is started, the process for terminating the coasting control (the process for engaging the clutch, The process of increasing the engine speed) is limited. At time T5, the clutch 11 is completely disconnected.

  Then, at time T5 when the shortest duration has elapsed, if it is determined that the state of the vehicle matches the coasting control termination condition, the gear shift execution unit 53 performs the shift stage before engaging the clutch 11 by coasting control termination processing. Is switched. At this point, the clutch 11 is completely disengaged, so that a shock is hardly generated even when the shift stage is switched by the shift execution unit 53.

  Then, the process of engaging the clutch 11 is started from the time (time T5) when the shift stage is switched by the shift execution unit 53. As a result, in this embodiment, the clutch is completely engaged at time T6 earlier than time T4 at which the shift is completed in the conventional example, and the shift is completed.

  As described above, according to the vehicle control device according to the present embodiment, the coasting control is continued until the minimum duration time has elapsed since the coasting control was started. There is no need to disengage the clutch again, and the occurrence of shocks related to gear shifting can be reduced. Further, the shift can be completed earlier than in the past.

  In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably and can implement.

  For example, in the above embodiment, AMT has been described as an example. However, the present invention is not limited to this, and the transmission may be another type of automatic transmission (for example, a torque controller) as long as the clutch can be automatically connected and disconnected. Type transmission).

1 Vehicle 10 Engine 11 Clutch 12 Transmission 13 Propeller Shaft 14 Differential Device 15 Drive Shaft 50 ECU
51 coasting control start execution unit 52 coasting control end execution unit 53 shift execution unit

Claims (5)

Coasting control start executing means for starting coasting control by disengaging the clutch and lowering the engine speed when satisfying a predetermined coasting control start condition;
Coasting control end execution means for restricting execution of coasting control end processing for increasing the engine speed and bringing the clutch into contact until a predetermined time elapses after the coasting control is started. . The coasting control end execution means does not determine whether a predetermined coasting control end condition that is a condition for executing the coasting control end process is satisfied until a predetermined time elapses after the coasting control is started. The vehicle control device described. Even when the coasting control end execution means detects that the predetermined coasting control end condition, which is a condition for executing the coasting control end process, is satisfied, a predetermined time period from the start of the coasting control The vehicle control device according to claim 1, wherein the vehicle control device waits for execution of the coasting control end process until the time elapses. The vehicle control device according to any one of claims 1 to 3, wherein the predetermined time is equal to or longer than a time until the clutch is completely disengaged by the coasting control start execution unit. The vehicle control device according to any one of claims 1 to 4, further comprising a shift execution unit that switches to a predetermined gear position before the engagement of the clutch by the coasting control end execution unit is executed.

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