JP2012031943A - Coasting control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coasting control device having superior responsiveness of acceleration to a sudden operation of an accelerator pedal.SOLUTION: The coasting control device includes: a coasting control executing unit 3 which starts coasting control by disengaging a clutch and reducing the rotational speed of an engine to a target rotational speed of the engine when an engine is driven without performing any work externally; and a clutch engagement control unit 6 which controls engagement of the clutch at a clutch engagement speed corresponding to acceleration by an accelerator pedal operation when the coasting control is ended.

Description

  TECHNICAL FIELD The present invention relates to a coasting control device that disengages a clutch during running to return an engine to an idle state and suppresses fuel consumption, and relates to a coasting control device that has excellent acceleration responsiveness to sudden operation of an accelerator pedal.

  In the vehicle, when the accelerator pedal is depressed when the clutch is disengaged, the accelerator is opened and the engine is so-called empty, and the engine speed settles at the engine speed corresponding to the accelerator opening. At this time, the driving force generated by the engine and the engine internal resistance (friction) are balanced, and the engine output torque is zero. That is, the engine does not work at all with respect to the outside, and fuel is wasted. For example, if the engine speed is 2000 rpm, the driver can hear a loud engine sound, so that a considerable amount of fuel is consumed wastefully.

  The state in which the engine does not work to the outside is not limited to the idling when the clutch is disengaged, but also occurs while the vehicle is running. That is, the engine only rotates at an engine speed corresponding to the accelerator opening, as in the case of flying, and does not contribute to acceleration / deceleration of the vehicle. At this time, fuel is consumed only for rotating the engine, which is very wasteful.

  The present applicant performs coasting control (also referred to as fuel consumption traveling control) that disengages the clutch and returns the engine to an idle state to reduce fuel consumption when the engine is rotating but not working to the outside. A coasting control device was proposed (Patent Document 1).

JP 2006-342832 A JP-A-8-67175 JP 2001-304305 A

  According to this coasting control device, during traveling by coasting control, the clutch is disengaged and the engine speed is the idle speed. At this time, if the driver depresses the accelerator pedal at a predetermined speed or higher, coasting control is terminated, and the engine speed matches the clutch speed, or the clutch can be engaged without causing an impact. Raise it to within range, engage the clutch, and accelerate the vehicle according to the driver's willingness to accelerate.

  However, at the time of coasting control, the engine is reduced to idle rotation unlike at the time of shifting. For this reason, when returning from clutch disengagement to clutch engagement at the end of coasting control, the engine speed relative to the clutch is adjusted. Therefore, even if the clutch engagement speed VC is slightly increased as described above, the time until the clutch is engaged is long. During this time, the driver feels that the vehicle has not started accelerating despite the accelerator operation. If you do not intend to accelerate quickly and depress the accelerator pedal slowly, there is no big problem, but if you depress the accelerator pedal suddenly to accelerate quickly, you will feel a feeling of free running and dissatisfied Discomfort occurs.

  Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a coasting control device that is excellent in acceleration responsiveness to sudden operation of an accelerator pedal.

  In order to achieve the above object, the present invention starts coasting control by disengaging the clutch and lowering the engine speed to the target engine speed when the engine is being operated without working to the outside. And a clutch engagement control unit that controls the clutch to be engaged at a clutch engagement speed corresponding to the accelerator pedal operation acceleration at the end of the coasting control.

The coasting control determination map is referred to by the clutch rotational speed and the accelerator opening, and the coasting control execution unit includes a plot point of the clutch rotational speed and the accelerator opening on the coasting control determination map within the coasting controllable region. When the accelerator pedal operation speed is within a predetermined range and the plot point of the clutch rotation speed and the accelerator opening passes the coasting control threshold line in the direction of decreasing the accelerator opening, the coasting control is started. When the operating speed is out of the predetermined range or when the plot point is out of the coasting controllable region, coasting control is terminated, and the accelerator pedal operation amount ACC, the engine speed ENG, and the vehicle speed SPD are calculated based on the basic clutch contact speed calculation formula VCbase. = K1 x ACC
+ K2 × ENG + K3 × SPD
(K1, K2, and K3 are coefficients)
And a clutch engagement speed calculation unit that obtains the basic clutch contact speed VCbase by substituting into, and an accelerator pedal operation acceleration d ² ACC / dt ² at the end of coasting control is calculated by VCadd = K4 × d ² ACC / dt ²
(K4 is a coefficient)
And an acceleration calculating unit for obtaining an acceleration VCadd by substituting into the clutch, and the clutch engagement control unit adds the acceleration VCadd to the basic clutch engagement speed VCbase to obtain a clutch engagement speed VC. The clutch may be controlled to be engaged at the speed VC.

  The present invention exhibits the following excellent effects.

  (1) The acceleration response to a sudden operation of the accelerator pedal is excellent.

It is a block block diagram of the coasting control apparatus of this invention. 1 is a block configuration diagram of a vehicle clutch system to which a coasting control device of the present invention is applied. It is a block diagram of the actuator which implement | achieves the clutch system of FIG. 1 is an input / output configuration diagram of a vehicle to which a coasting control device of the present invention is applied. It is an operation | movement conceptual diagram for demonstrating the outline of coasting control. It is a graph image figure of a coasting control determination map. It is a graph for demonstrating the fuel consumption reduction effect by coasting control. It is a graph of the accelerator opening actually measured in order to create a coasting control determination map, and clutch rotation speed. It is a flowchart which shows the procedure of the clutch contact speed calculation in the coasting control apparatus of this invention. 4 is a timing chart from an accelerator operation to clutch engagement in a coasting control device to which the present invention is not applied. 4 is a timing chart from the accelerator operation to the clutch engagement in the coasting control device of the present invention.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the coasting control device 1 according to the present invention includes a coasting control determination map 2 referred to by the clutch rotational speed and the accelerator opening, and the clutch rotational speed and the accelerator opening to the coasting control determination map 2. The plot point is within the coasting controllable region, the accelerator pedal operation speed is within the predetermined range, and the plot point of the clutch rotation speed and accelerator opening has passed the coasting control threshold line in the direction of decreasing accelerator opening. When it is determined that the engine is operating without work to the outside, the clutch is disengaged and the engine speed is decreased to start coasting control, and the accelerator pedal operation speed is out of the predetermined range. Alternatively, the coasting control execution unit 3 terminates coasting control when the plot point goes out of the coasting controllable region, the accelerator pedal operation amount ACC, the engine speed ENG, and the vehicle speed SP. Basic clutch contact speed arithmetic expression VCbase = K1 × ACC
+ K2 × ENG + K3 × SPD
(K1, K2, and K3 are coefficients)
And the clutch engagement speed calculation unit 4 for obtaining the basic clutch engagement speed VCbase by substituting into the above and the acceleration pedal operation acceleration dACC / dt ² at the end of coasting control by the acceleration calculation formula VCadd = K4 × d ² ACC / dt ²
(K4 is a coefficient)
Is added to the basic clutch contact speed VCbase to add the speed increase VCadd to the clutch contact speed VC, and the clutch is controlled to be engaged at this clutch contact speed VC. Thus, a clutch engagement control unit 6 is provided that controls the clutch to be engaged at a clutch engagement speed corresponding to the accelerator pedal operation acceleration at the end of coasting control.

  The coasting control device 1 also includes a rotation matching control unit 7 that engages the clutch after increasing the engine rotational speed to within the allowable contact range with respect to the clutch rotational speed at the end of coasting control.

  The coasting control determination map 2, the coasting control execution unit 3, the clutch contact speed calculation unit 4, the speed increase calculation unit 5, the clutch contact control unit 6, and the rotation alignment control unit 7 that constitute the coasting control device 1 are, for example, an ECU ( (Not shown) is preferably mounted.

  Each part is demonstrated about the vehicle carrying the coasting control apparatus 1 of this invention.

  As shown in FIG. 2, the vehicle clutch system 101 on which the coasting control device 1 of the present invention is mounted is a system in which a manual type and an automatic type by ECU control are compatible. A clutch master cylinder 103 mechanically coupled to the clutch pedal 102 supplies operating oil to an intermediate cylinder (also referred to as a clutch-free operating cylinder or a switching cylinder) 104 in accordance with a depression / return operation of the clutch pedal 102 by a driver. It is like that. On the other hand, a clutch-free actuator unit 105 controlled by an ECU (not shown) supplies hydraulic oil to the intermediate cylinder 104 in response to a clutch disengagement / contact command. The intermediate cylinder 104 supplies operating oil to the clutch slave cylinder 106. The piston 107 of the clutch slave cylinder 106 is mechanically connected to the movable part of the clutch 108.

  As shown in FIG. 3, the actuator 110 includes a clutch-free actuator 111. The clutch free actuator 111 includes an intermediate cylinder 104 and a clutch free actuator unit 105. The clutch free actuator unit 105 includes a solenoid valve 112, a relief valve 113, and a hydraulic pump 114. In the intermediate cylinder 104, a primary piston 116 and a secondary piston 117 are arranged in series. When the primary piston 116 is stroked by the operating oil from the clutch master cylinder 103, the secondary piston 117 is caused to stroke. . The intermediate cylinder 104 is configured such that the secondary piston 117 is stroked by the operating oil from the clutch-free actuator unit 105. Operating oil is supplied to the clutch slave cylinder 106 in accordance with the stroke of the secondary piston 117. With this configuration, when manual operation is performed, clutch disengagement / engagement is preferentially performed according to manual operation, and when manual operation is not performed, clutch disengagement / engagement according to ECU control is performed.

  In the ECU control, when both the solenoid valve 112 and the relief valve 113 are fully closed, when the hydraulic pump 114 is driven and operating oil is introduced (IN) into the intermediate cylinder 104, the secondary piston 117 strokes and the clutch slave Operating oil is supplied to the cylinder 106 and the clutch is disconnected. On the other hand, when the hydraulic pump 114 is stopped and at least one of the solenoid valve 112 and the relief valve 113 is opened, the operating oil in the intermediate cylinder 104 is discharged (OUT). At this time, these valves are subjected to duty control (pulse control that adjusts the time ratio between fully closed and fully opened), whereby the operating oil in the intermediate cylinder 104 is discharged at a speed determined by the duty control. Thereby, the return speed of the secondary piston 117, that is, the contact speed of the clutch can be arbitrarily controlled.

  The coasting control device 1 of the present invention can also be applied to an automatic clutch system without a manual type.

  As shown in FIG. 4, the vehicle is provided with an ECU 121 that mainly controls a transmission and a clutch, and an ECM 122 that mainly controls an engine. The ECU 121 includes a shift knob switch, a transmission shift sensor, a select sensor, a neutral switch, a T / M rotation sensor, a vehicle speed sensor, an idle switch, a manual changeover switch, a parking brake switch, a door switch, a brake switch, a half-clutch adjustment switch, Input signal lines for the accelerator operation amount sensor, the clutch sensor, and the hydraulic switch are connected. Further, the ECU 121 is connected with output signal lines of a motor of the hydraulic pump 114 of the clutch system 101, a solenoid valve 112, a slope start assisting valve, and a warning & meter. Although not shown, various input signal lines and output signal lines used for engine control are connected to the ECM 122. The ECM 122 can transmit each signal of the engine speed, the accelerator opening, and the engine speed change request to the ECU 121 via a CAN (Controller Area Network) transmission path.

  The clutch rotational speed used in the present invention is the rotational speed on the driven side of the clutch, and is the same as the rotational speed of the input shaft of the transmission. The clutch rotational speed can be obtained from the input shaft rotational speed detected by an input shaft rotational speed sensor (not shown). Alternatively, the clutch rotational speed can be obtained from the vehicle speed detected by the vehicle speed sensor using the gear ratio of the current gear stage. The clutch rotational speed represents the engine rotational speed corresponding to the vehicle speed.

  Hereinafter, the operation of the coasting control device 1 of the present invention will be described.

  The operation concept of coasting control will be described with reference to FIG. The horizontal axis shows time and control flow, and the vertical axis shows engine speed. While the accelerator pedal 141 is largely depressed from the idling state and the accelerator opening degree continues to be 70%, the engine speed 142 increases and the vehicle is accelerated. Assume that a coasting control start condition described later is satisfied when the engine speed 142 is stabilized, the depression of the accelerator pedal 141 is reduced, and the accelerator opening is 35%. By starting coasting control, the clutch is controlled to be disengaged, and the engine speed 142 is controlled to the idle speed. The vehicle will run in coasting control. Thereafter, it is assumed that the accelerator pedal is no longer depressed and the accelerator opening becomes 0% or other coasting control end conditions are satisfied. When the coasting control ends, the engine is controlled to rotate and the clutch is controlled to contact. In this example, since the accelerator opening is 0%, the engine is braked and the vehicle is decelerated.

  If coasting control is not performed, the engine speed remains high as indicated by the broken line during the coasting control execution period, so that fuel is wasted, but coasting control is performed. Thus, during coasting control, the engine speed 142 becomes the idling speed and fuel is saved.

  FIG. 6 shows the coasting control determination map 2 as a graph image.

  The coasting control determination map 2 is a map in which the horizontal axis is the accelerator opening and the vertical axis is the clutch rotational speed. The coasting control determination map 2 can be divided into a minus region MA where the engine output torque is negative and a plus region PA where the engine output torque is positive. The minus region MA is a region where the engine friction is larger than the engine required torque and the engine output torque is negative. The positive region PA is a region where the engine output torque is positive because the engine required torque is larger than the engine friction. The engine output torque zero line ZL, which is the boundary between the minus area MA and the plus area PA, indicates that the engine does not work to the outside as described in the background art, and fuel is wasted.

  In the present embodiment, the coasting control threshold line TL is set slightly to the left of the engine output torque zero line ZL of the coasting control determination map 2 (on the side where the accelerator opening is small). In the coasting control determination map 2, a coasting controllable area CA having a finite width including the coasting control threshold line TL is set between the minus area MA and the plus area PA. In the coasting control determination map 2, a lower limit threshold line UL of the clutch rotational speed is set. The lower limit threshold line UL defines a lower limit threshold value of the clutch rotational speed regardless of the accelerator opening. The lower limit threshold line UL is set slightly above the clutch rotational speed in the idle state as shown in the figure.

The coasting control device 1 starts coasting control when all the following four coasting start conditions are satisfied.
(1) The accelerator pedal operating speed is within the threshold range. (2) In the coasting control determination map 2, the plot points of the clutch rotational speed and the accelerator opening pass the coasting control threshold line TL in the accelerator return direction. The plot point on the control determination map 2 is within the coasting controllable area CA. (4) In the coasting control determination map 2, the clutch rotational speed is equal to or greater than the lower limit threshold line UL.

The coasting control device 1 is configured to end coasting control when at least one of the following two coasting termination conditions is satisfied.
(1) The accelerator pedal operating speed is outside the threshold range. (2) The plot point on the coasting control determination map 2 is outside the coasting control possible area CA.

  The operation of the coasting control device 1 according to the coasting control determination map 2, the coasting start condition, and the coasting end condition will be described.

  The coasting control execution unit 3 constantly monitors the accelerator opening based on the accelerator pedal operation amount and the clutch rotational speed obtained from the input shaft rotational speed or the vehicle speed, and displays the accelerator opening on the coasting control determination map 2 of FIG. And plot the clutch rotation speed coordinate point. Coordinate points move over time. At this time, when the coordinate point exists in the coasting controllable area CA, the coasting control execution unit 3 determines whether or not to start coasting control. When the coordinate point does not exist in the coasting controllable area CA, the coasting control execution unit 3 does not determine whether to start coasting control.

  Next, when the coordinate point passes the coasting control threshold line TL in the direction in which the accelerator opening decreases, the coasting control execution unit 3 starts coasting control. That is, the coasting control device 1 controls the clutch to be disengaged and controls the control accelerator opening that the ECM 122 instructs the engine to correspond to the idle. As a result, the clutch is disengaged and the engine is in an idle state.

  As shown in FIG. 6 by the arrow indicating the moving direction of the coordinate point, the direction in which the accelerator opening decreases is the left direction in the figure. Even if the coordinate point passes the coasting control threshold line TL, if the movement direction of the coordinate point has a component in the right direction in the figure, the accelerator opening increases, so the coasting control execution unit 3 performs coasting control. Do not start.

  The coasting control execution unit 3 constantly monitors the accelerator opening and the clutch rotational speed even after starting coasting control, and plots the coordinate points of the accelerator opening and the clutch rotational speed on the coasting control determination map 2. When the coordinate point goes out of the coasting controllable area CA, the coasting control execution unit 3 ends the coasting control.

  With the above operation, when the accelerator pedal is operated to the depression side, coasting control is not started even if the coordinate point of the accelerator opening and the clutch rotational speed passes the coasting control threshold line TL, and the accelerator pedal is Since the coasting control is started when the coordinate point passes the coasting control threshold line TL only when operated on the return side, the driver does not feel uncomfortable.

  The coasting control execution unit 3 does not start coasting control when the coordinate point is below the lower limit threshold line UL (the clutch rotational speed is lower than the lower limit threshold). This is because even if the clutch is disengaged when the engine is in an idle state, many effects of suppressing fuel consumption cannot be expected. Therefore, coasting control execution unit 3 starts coasting control only when the coordinate point exists above the lower limit threshold line UL.

  The fuel consumption reduction effect by coasting control will be described with reference to FIG.

  First, it is assumed that coasting control is not performed. The engine speed changes in the range of 1600 to 1700 rpm from about 30 s to about 200 s, and decreases from about 1700 rpm to about 700 rpm (idle speed) between about 200 s and about 260 s. .

  The engine torque increases from about 30 s to about 100 s, but then starts to decrease and continues to decrease to about 150 s. The engine torque is about 0 Nm from about 150 s to about 160 s and increases between about 160 s and about 200 s, but becomes about 0 Nm at about 200 s. As a result, the period during which the engine torque is approximately 0 Nm is from about 150 s to about 160 s (ellipse B1), from about 200 s to about 210 s (ellipse B2), and from about 220 s to about 260 s (ellipse B3). is there.

  The fuel consumption (no vertical axis scale; for convenience, it is arranged so as to overlap with the engine torque) changes from about 50 s to about 200 s almost accompanying the transition of the engine torque. Even if the engine torque is approximately 0 Nm, the fuel consumption is not zero.

  Here, when coasting control is performed, the engine speed is controlled to the idle speed during a period in which the engine torque is approximately 0 Nm. The graph shows a line (thick solid line) of the engine speed during coasting control so as to be separated from a line (solid line) of the engine speed not performing coasting control. The coasting control was executed three times for ellipses B1, B2 and B3. The fuel consumption amount in the period when the coasting control is performed is lower than the fuel consumption amount when the coasting control is not performed, and it is understood that the fuel consumption is saved.

  Next, a specific setting example of the coasting control determination map 2 will be described.

  As shown in FIG. 8, in order to create the coasting control determination map 2, the characteristics of the accelerator opening and the clutch rotational speed are measured, the horizontal axis is the accelerator opening, and the vertical axis is the clutch rotational speed (= engine rotational speed). ; When the clutch is engaged). Thereby, the actually measured engine output torque zero line ZL can be drawn. The entire left side of the engine output torque zero line ZL is the minus region MA, and the entire right side is the plus region PA.

  A coasting control threshold line TL is defined and drawn slightly to the left of the engine output torque zero line ZL. A deceleration zero threshold line TLg is estimated and drawn slightly to the left of the coasting control threshold line TL. An acceleration zero threshold line TLk is estimated and drawn slightly to the right of the engine output torque zero line ZL. A region sandwiched between the deceleration zero threshold line TLg and the acceleration zero threshold line TLk is defined as a coasting controllable region CA. In this example, the lower limit threshold line UL is set to 880 rpm.

  The deceleration zero threshold line TLg and the acceleration zero threshold line TLk are set to such an extent that the driver is difficult to drive. However, since they are problems of human sense, they cannot be quantified by design, so they are tuned with an actual vehicle. The coasting control threshold line TL is set at the center of the deceleration zero threshold line TLg and the acceleration zero threshold line TLk.

  The graph of FIG. 8 created as described above is appropriately digitized (discretized) and written into the storage element, whereby the coasting control determination map 2 that can be used for the arithmetic processing by the coasting control execution unit 3 is obtained.

  Next, the clutch contact speed calculation in the coasting control device 1 of the present invention will be described with reference to FIG.

  As soon as the coasting control execution unit 3 finishes the coasting control, the rotation alignment control unit 7 starts the rotation alignment control. The rotation matching control is a control for engaging the clutch when the engine rotational speed that has been reduced to the idle rotational speed is increased and the engine rotational speed falls within the allowable contact range with respect to the clutch rotational speed.

  When the engine speed rises within the allowable contact range with respect to the clutch rotational speed by the rotation matching control, the clutch engagement control is started.

  In step S91, it is determined whether the clutch engagement control is being performed. If YES, the process proceeds to step S92. If NO, the process ends.

In step S92, the clutch engagement speed calculation unit 4 determines the basic clutch engagement speed calculation formula VCbase = K1 × ACC based on the accelerator pedal operation amount ACC, the engine speed ENG, and the vehicle speed SPD.
+ K2 × ENG + K3 × SPD
To obtain the basic clutch contact speed VCbase. Here, it is assumed that the coefficients K1, K2, and K3 are set in advance by experiments.

Next, in step S93, the acceleration calculation unit 5 calculates the acceleration pedal operation acceleration d ² ACC / dt ² at the end of coasting control by the acceleration calculation equation VCadd = K4 × d ² ACC / dt ^2.
Substituting into, the acceleration VCadd is obtained. Here, it is assumed that the coefficient K4 is set in advance by experiments.

  Next, in step S94, the clutch engagement control unit 6 adds the speed increase VCadd to the basic clutch engagement speed VCbase to obtain the clutch engagement speed VC, and controls the clutch to be engaged at this clutch engagement speed VC.

As a result, the clutch engagement speed VC becomes faster than before, and the clutch is engaged in a short time. Since the speed increase VCadd is proportional to the accelerator pedal operation acceleration dACC / dt ² , as the driver depresses the accelerator pedal suddenly, the speed increase VCadd increases and the clutch engagement speed VC increases.

  The effect of the coasting control device 1 of the present invention will be described with reference to a comparison between FIG. 10 and FIG.

  As shown in FIG. 10, in the coasting control device to which the present invention is not applied, during coasting control (# 101) in which the clutch is disengaged, the accelerator pedal is operated at a relatively small accelerator pedal operation acceleration, and the accelerator pedal operation is performed. Assume that the amount is larger than the value during coasting control (# 102). When the accelerator pedal operation speed exceeds the threshold value, the aforementioned coasting end condition is satisfied, and the coasting control ends (# 103). Immediately, rotation alignment is started (# 104). When the engine speed matches the clutch speed (reaches within the allowable contact range), clutch engagement is started (# 105). The clutch shifts from disengagement to engagement at the conventional clutch engagement speed VC (# 106), and the clutch engagement is completed (# 107).

  In this timing chart, even if the accelerator pedal is operated at a relatively large accelerator pedal operation acceleration, the time required for clutch engagement # 106 is the same. During the time from coasting control end # 103 to clutch engagement completion # 107 (or from the start of the accelerator pedal to clutch engagement completion # 107), the vehicle does not start accelerating, so the driver feels free running It will be a free running time.

As shown in FIG. 11, in the coasting control device 1 of the present invention, during coasting control (# 111) in which the clutch is disengaged, the accelerator pedal is operated at a relatively large accelerator pedal operating acceleration d ² ACC / dt ² . It is assumed that the accelerator pedal operation amount becomes larger than the value during coasting control (# 112). When the accelerator pedal operation speed exceeds the threshold value, the aforementioned coasting end condition is satisfied, and the coasting control ends (# 113). Immediately, rotation alignment is started (# 114). When the engine speed matches the clutch speed (reaches within the allowable contact range), clutch engagement is started (# 115). The clutch shifts from disengagement to engagement at a faster clutch engagement speed VC than in the prior art (# 116), and clutch engagement is completed (# 117).

During the time from coasting control end # 113 to clutch engagement completion # 117 (or the time from start of depression of the accelerator pedal to clutch engagement # 117), the vehicle does not start accelerating, so the driver feels free running. It becomes idle time. However, compared to FIG. 10 drawn on the same scale, it can be seen that the idling time is shortened because the time during which the clutch engagement control is performed is shortened. If the accelerator pedal operation acceleration d ² ACC / dt ² is further larger, the time during which the clutch engagement control is performed is further shortened, so that the idle running time is further shortened.

  As described above, according to the coasting control device 1 of the present invention, the clutch engagement speed is calculated in consideration of the accelerator pedal operation acceleration at the end of the coasting control. And free running time is reduced. As a result, when the driver suddenly operates the accelerator pedal operation (= accelerator operation acceleration is large) during coasting control, the vehicle accelerates with high responsiveness to the sudden acceleration will. The driver's uncomfortable feeling when entering the rapid acceleration from coasting control is reduced.

  According to the coasting control device 1 of the present invention, the speed increase is calculated in proportion to the acceleration of the accelerator pedal operation, so that the idling time is shortened as the accelerator pedal operation becomes steep. The tendency can be adjusted by the coefficient K4.

1 coasting control device 2 coasting control determination map 3 coasting control execution unit 4 clutch engagement speed calculation unit 5 acceleration calculation unit 6 clutch engagement control unit 7 rotation matching control unit

Claims (2)

A coasting control execution unit for starting coasting control by disengaging the clutch and lowering the engine speed to the target engine speed when the engine is operated without performing work on the outside;
A coasting control device comprising: a clutch engagement control unit that controls the clutch to be engaged at a clutch engagement speed according to acceleration acceleration of an accelerator pedal at the end of coasting control. It has a coasting control determination map referred to by the clutch rotational speed and the accelerator opening,
The coasting control execution unit has a plot point of the clutch rotational speed and the accelerator opening to the coasting control determination map in the coasting controllable region, the accelerator pedal operation speed is within a predetermined range, and the clutch rotational speed When the accelerator opening plot point passes the coasting control threshold line in the accelerator opening decreasing direction, coasting control is started and the accelerator pedal operation speed is out of the specified range or the plot point is outside the coasting controllable area. When you exit, coast control is terminated.
Acceleration pedal operation amount ACC, engine speed ENG, and vehicle speed SPD are calculated based on the basic clutch contact speed VCbase = K1 × ACC
+ K2 × ENG + K3 × SPD
(K1, K2, and K3 are coefficients)
A clutch engagement speed calculation unit that obtains the basic clutch engagement speed VCbase by substituting
Accelerator pedal operation acceleration d ² ACC / dt ² at the end of coasting control is calculated as an acceleration calculation formula VCadd = K4 × d ² ACC / dt ²
(K4 is a coefficient)
And an acceleration calculation unit that calculates the acceleration VCadd by substituting
2. The coasting according to claim 1, wherein the clutch contact control unit adds a speed increase VCadd to the basic clutch contact speed VCbase to obtain a clutch contact speed VC, and controls the clutch to be engaged at the clutch contact speed VC. Control device.

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