JP2015017955A - Engine speed display device for vehicle, and control method of engine speed display device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine speed display device for vehicles that can display engine speed on an engine speed display so as not to give discomfort to a driver while highlighting a sharp change in the engine speed at the time of gear change.SOLUTION: An engine speed display device for vehicles includes an engine speed sensor (26) that detects engine speed, a tachometer (28) that displays the engine speed, a tachometer control part (30) that controls the display on the tachometer on the basis of the detected engine speed, and a control unit (44). When the operation state of a vehicle is not included in a lockup area, and the gear change control of an automatic transmission is performed, the tachometer control part and control unit forcibly change the engine speed toward a target rotation speed after the gear change, and increase the responsiveness of the display of the tachometer compared with the state where the gear change control of the automatic transmission is not performed.

Description

  The present invention relates to a vehicle engine speed display device and a control method for a vehicle engine speed display device, and more particularly, displays an engine speed of a vehicle having an automatic transmission having a torque converter with a lock-up clutch. The present invention relates to a vehicle engine speed display device and a control method for a vehicle engine speed display device.

Conventionally, an engine speed display device for displaying the engine speed of a vehicle has been used. This engine speed display device includes an engine speed display (tachometer, rev counter) that displays the engine speed in response to an engine speed signal output from an engine speed sensor that detects the engine speed. Control.
Since the engine speed signal fluctuates reflecting minute fluctuations in the engine speed and fluctuations in detection of the engine speed sensor, if this engine speed signal fluctuation is displayed on the engine speed indicator as it is, The display of the engine speed continues to fluctuate slightly, causing a problem that visibility is deteriorated.
Therefore, in order to prevent such deterioration in visibility, it has been proposed to deliberately reduce the responsiveness of the display of the engine speed indicator to the engine speed signal output from the engine speed sensor.

  For example, Patent Document 1 discloses a vehicle engine speed display device that determines an engine speed to be displayed on a display based on an engine speed signal in a predetermined determination period. This vehicle engine speed display device shortens the determination period in accordance with an increase in engine speed. That is, since the determination period becomes longer when the engine is at a low engine speed, the responsiveness of the display of the engine engine speed indicator with respect to the engine engine speed signal is reduced, and minute fluctuations in the display are prevented. On the other hand, since the determination period is shortened when the engine is at a low engine speed, the responsiveness of the display of the engine engine speed indicator with respect to the engine engine speed signal is increased, and a display following the fluctuation of the engine engine speed is performed.

In addition, a driver who drives a vehicle equipped with a high-performance engine expects a sharp change in the engine speed at the time of shifting as a scene where the high performance of the engine appears. At this time, the driver not only feels the change in the engine speed by hearing from the engine sound, but also tries to feel it visually from the change in the display of the engine speed display.
Therefore, it has been proposed to increase the responsiveness of the display of the engine speed indicator at the time of shifting compared to that at the time of non-shifting.

  For example, in Patent Document 2, when a predetermined amount of accelerator pedal operation is performed, or when a shift operation is performed in the manual shift mode, the display responsiveness of the tachometer is increased, thereby increasing the driver's intention. An operation state display device for an internal combustion engine is disclosed which performs a desired display operation accordingly.

JP-A-1-154195 JP 2006-242760 A

  By the way, the lock-up clutch included in the torque converter of the automatic transmission is controlled so as to be in a fully released release state, a fully engaged engagement state, or a semi-engaged slip engagement state.

Of these, in the engaged state or slip engaged state, if the rotational speed of the turbine of the torque converter changes with the change in the gear ratio of the automatic transmission, the rotational speed of the engine connected to the turbine via the lock-up clutch also changes. It changes rapidly to follow the turbine speed.
On the other hand, in the released state, the lock-up clutch is released and the engine is not mechanically connected to the turbine, so the rotational speed of the torque converter turbine changes as the gear ratio of the automatic transmission changes. However, the engine speed does not follow the turbine speed quickly, and changes unstablely and slowly.

  However, the above-mentioned device of Patent Document 1 simply increases the response of the display of the engine speed indicator in accordance with the increase of the engine speed, and does not consider the state of the lockup clutch. Even if the responsiveness of the display of the engine speed indicator is increased when the lockup clutch is in the released state during the shift control of the automatic transmission, a slow change in the engine speed is displayed on the engine speed indicator. There is a problem that a driver who expects a rapid change in engine speed feels uncomfortable.

  Further, the above-described device of Patent Document 2 simply increases the display responsiveness of the tachometer when a predetermined shift command is issued, and does not consider the state of the lockup clutch. Even if the responsiveness of the display of the engine speed indicator is increased according to a predetermined shift command in the released state, a slow change in the engine speed is displayed on the engine speed indicator, and the engine speed There is a problem that drivers who expect rapid changes feel uncomfortable.

  The present invention has been made to solve the above-mentioned problems of the prior art, and the engine speed is set so that a sharp change of the engine speed at the time of shifting is conspicuous regardless of the state of the lock-up clutch. It is an object of the present invention to provide a vehicle engine speed display device that can be displayed on a speed display device and a control method for the vehicle engine speed display device.

In order to achieve the above object, an engine speed display device for a vehicle according to the present invention includes an engine, an automatic transmission including a torque converter with a lock-up clutch connected to the engine, and the automatic transmission. The automatic transmission control means for controlling, the driving condition detecting means for detecting the driving condition of the vehicle, and the driving condition of the vehicle detected by the driving condition detecting means are included in the lockup region for performing the engagement control of the lockup clutch. Lockup region determination means for determining whether or not the vehicle is engaged, and when the lockup region determination means determines that the driving state of the vehicle is included in the lockup region, the lockup clutch engagement control is performed. A vehicle engine speed display device for displaying an engine speed of a vehicle having a lockup control means, the engine speed Engine speed detection means for detecting engine speed, engine speed display means for displaying engine speed, and display control for controlling display by the engine speed display means based on the engine speed detected by the engine speed detection means The display control means determines that the driving state of the vehicle is not included in the lockup area by the lockup area determination means, and the automatic transmission control means performs shift control of the automatic transmission. When the engine is running, the engine speed is forcibly changed toward the target speed after the shift of the automatic transmission, and the driving state of the vehicle is locked by the lock-up area determination means. When it is determined that it is not included in the up region and the shift control of the automatic transmission is being performed by the automatic transmission control means, Responsiveness increasing means for increasing the responsiveness of the display of the engine speed display means with respect to the engine speed detected by the engine speed detecting means as compared to when the automatic transmission is not performing the shift control. It is characterized by.
In the present invention configured as described above, when the driving state of the vehicle is not included in the lockup region and the shift control of the automatic transmission is being performed, the engine speed forcibly changing means is The engine speed is forcibly changed toward the target speed after the shift of the automatic transmission, and the responsiveness increasing means displays the engine speed display means with respect to the engine speed detected by the engine speed detecting means. Since the responsiveness is increased compared to when the shift control of the automatic transmission is not performed, the driver can sharply change the engine speed during a shift even when the driving state of the vehicle is not included in the lockup region. Can be sensed visually from the change in the display of the engine speed display means.

In the present invention, the engine speed forcibly changing means preferably controls the lockup clutch to be engaged by the lockup control means so as to forcibly change the engine speed toward the target speed after the shift. .
In the present invention configured as described above, the engine speed forcibly changing means forcibly controls the engine speed toward the target speed after the shift by controlling the lockup clutch to be engaged by the lockup control means. Therefore, when the rotational speed of the turbine of the torque converter changes with the shift control of the automatic transmission, the rotational speed of the engine connected to the turbine via the lock-up clutch is made to follow the turbine rotational speed. Thus, a sharp change in the engine speed at the time of shifting can be displayed on the engine speed display means without a sense of incongruity.

In the present invention, the engine speed forcibly changing means preferably slip-engages the lockup clutch by the lockup control means so as to forcibly change the engine speed toward the target speed after the shift. .
In the present invention configured as described above, the engine speed forcibly changing means forcibly changes the engine speed toward the target speed after the shift by causing the lockup clutch to be slip-engaged by the lockup control means. Therefore, even if the turbine speed of the torque converter fluctuates due to fluctuations in the hydraulic pressure supplied to the transmission mechanism of the automatic transmission, etc. Can be absorbed by slipping. As a result, when the engine speed forcibly changing means forcibly changes the engine speed toward the target speed after the shift, it is possible to suppress the engine speed from changing in an unstable manner. It is possible to prevent the user from feeling uncomfortable.

In the present invention, it is preferable that the vehicle engine speed display device displays an engine speed of a vehicle having an automatic transmission that is driven by the engine and includes an oil pump that supplies an engagement control hydraulic pressure to the lockup clutch. The display control means determines whether the phase of the shift operation of the automatic transmission is an inertia phase when the shift control of the automatic transmission is performed by the automatic transmission control means. The engine speed forcibly changing means has a phase determining means, and when the inertia phase determining means determines that the phase of the shift operation of the automatic transmission is the inertia phase, the lockup control means applies the lockup clutch. The responsiveness raising means is controlled by the inertia phase judging means, and the automatic transmission When the phase of the shift operation is determined to be inertia phase, it increases the representation of the response of the engine speed display means.
In the present invention configured as described above, the engine speed forced changing means causes the lockup clutch to be engaged and controlled by the lockup control means when the shift operation phase of the automatic transmission is the inertia phase. The period during which the up-clutch engagement control is performed can be limited to the inertia phase in which a rapid change in the engine speed is expected. In other words, the period during which the oil pump supplies the engagement control hydraulic pressure to the lockup clutch can be limited to a period in which the necessity of the lockup clutch engagement control is high, so the engine speed forced change means locks the lockup clutch. It is possible to avoid an increase in the size of the oil pump due to the fastening control by the up control means.
Further, the responsiveness increasing means increases the responsiveness of the display of the engine speed display means when the shift operation phase of the automatic transmission is the inertia phase, so that a rapid change of the engine speed is expected. In the inertia phase, the responsiveness of the display of the engine speed display means can be increased, and thereby the engine speed is displayed on the engine speed display means so that the change of the engine speed during shifting is conspicuous. Can do.

In the present invention, it is preferable that the vehicle engine speed display device displays the engine speed of a vehicle having a manual shift operation means for a driver to perform a shift operation of the automatic transmission. The forced rotation speed changing means controls the engagement of the lockup clutch by the lockup control means when the shift operation of the automatic transmission is performed with respect to the manual shift operation means, and the responsiveness increasing means is the manual shift operation means. On the other hand, when the shift operation of the automatic transmission is performed, the response of the display of the engine speed display means is increased.
In the present invention configured as described above, when the shift operation of the automatic transmission is performed with respect to the manual shift operation means, the engine speed forced change means causes the lock-up clutch to be engaged and controlled by the lock-up control means. Since the responsiveness increasing means increases the responsiveness of the display of the engine speed display means, the driver expects that the engine speed change due to the shift of the automatic transmission is displayed on the engine speed display means. Sometimes, the engine speed forcibly changing toward the target speed after the shift can be displayed on the engine speed display means so that the change stands out due to high responsiveness.

  According to a second aspect of the present invention, there is provided a control method for a vehicle engine speed display device comprising: an engine; an automatic transmission having a torque converter with a lock-up clutch connected to the engine; and the automatic transmission. The automatic transmission control means for controlling, the driving condition detecting means for detecting the driving condition of the vehicle, and the driving condition of the vehicle detected by the driving condition detecting means are included in the lockup region for performing the engagement control of the lockup clutch. Lockup region determination means for determining whether or not the vehicle is engaged, and when the lockup region determination means determines that the driving state of the vehicle is included in the lockup region, the lockup clutch engagement control is performed. A control method for a vehicle engine speed display device having a lockup control means, the step of detecting the engine speed. And a step of controlling the display by the engine speed display device based on the detected engine speed, and the step of controlling the display by the engine speed display device is performed by driving the vehicle by the lockup region determination means. When it is determined that the state is not included in the lock-up region and the automatic transmission control is being performed by the automatic transmission control means, the engine speed is set to the target rotation after the automatic transmission is shifted. Step of forcibly changing the number of vehicles, the lockup region determination means determines that the driving state of the vehicle is not included in the lockup region, and the automatic transmission control means performs shift control of the automatic transmission. The automatic transmission shift control is performed on the response of the display of the engine speed display device with respect to the detected engine speed. Than when not and having the steps of: raising.

  According to the vehicle engine speed display device and the control method for the vehicle engine speed display device according to the present invention, the engine speed is set so that a sharp change in the engine speed at the time of shifting is conspicuous regardless of the state of the lockup clutch. The number can be displayed on the engine speed indicator.

1 is a schematic block diagram of a vehicle equipped with a vehicle engine speed display device according to an embodiment of the present invention. 1 is a block diagram of a vehicle engine speed display device according to an embodiment of the present invention. Changes in the engine speed at the time of upshifting of a vehicle equipped with the vehicle engine speed display device according to the embodiment of the present invention and the engine speed displayed on the tachometer when the responsiveness to the engine speed is changed. It is a diagram which shows a change. 5 is a map showing a lock-up region in which the vehicle engine speed display device according to the embodiment of the present invention performs lock-up clutch engagement control, using vehicle speed and accelerator opening as parameters. It is a flowchart of the display control process which the engine speed display apparatus for vehicles by embodiment of this invention performs. FIG. 6 shows changes in engine speed and turbine speed during upshifting of a vehicle equipped with a vehicle engine speed display device according to an embodiment of the present invention, and changes in flags set by the vehicle engine speed display device. It is a timing chart. It is a flowchart of the display control process which the engine speed display apparatus for vehicles by the 1st modification of embodiment of this invention performs. It is a flowchart of the display control process which the engine speed display apparatus for vehicles by the 2nd modification of embodiment of this invention performs. It is a flowchart of the display control process which the engine speed display apparatus for vehicles by the 3rd modification of embodiment of this invention performs.

Hereinafter, a vehicle engine speed display device and a control method for a vehicle engine speed display device according to embodiments of the present invention will be described with reference to the accompanying drawings.
First, a vehicle equipped with a vehicle engine speed display device according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic block diagram of a vehicle equipped with a vehicle engine speed display device according to an embodiment of the present invention.

  As shown in FIG. 1, reference numeral 1 denotes a vehicle equipped with a vehicle engine speed display device according to an embodiment of the present invention. The vehicle 1 uses the engine 2 and the power of the engine 2 as a desired speed and An automatic transmission 4 that converts the torque into an output, a differential gear 6 that transmits the power output from the automatic transmission 4 to the drive wheels 8, and a vehicle that transmits the power input via the differential gear 6 to the road surface. 1 and a drive wheel 8 for driving 1. Further, the vehicle 1 is equipped with an alternator 12 and an air conditioner 14 for supplying power to the battery 10, and the power of the engine 2 is transmitted to auxiliary devices such as a compressor of the alternator 12 and the air conditioner 14. .

  The automatic transmission 4 includes a torque converter 16 coupled to the output shaft of the engine 2, a transmission mechanism 18 coupled to the output shaft of the torque converter 16, and a hydraulic pressure driven by the engine 2 to the torque converter 16 and the transmission mechanism 18. And an oil pump 20 for supplying the oil. The torque converter 16 includes a torus 22 that transmits the power of the engine 2 to the speed change mechanism 18 by a fluid, and a lockup clutch 24 that mechanically directly connects the engine 2 and the speed change mechanism 18. The transmission mechanism 18 is a multi-stage transmission gear mechanism, and converts the rotational speed and torque by a combination of gears. The gear change and the engagement control of the lock-up clutch 24 are performed using the hydraulic pressure supplied from the oil pump 20.

  Next, the electrical configuration of the vehicle engine speed display device according to the embodiment of the present invention will be described with reference to FIG. FIG. 2 is a block diagram of a vehicle engine speed display device according to an embodiment of the present invention.

As shown in FIG. 2, the vehicle engine speed display device includes an engine speed sensor 26 that detects the speed of the output shaft of the engine 2 (engine speed), a tachometer 28 that displays the engine speed, and a tachometer. The tachometer control unit 30 for controlling the display by 28 is provided. The tachometer 28 includes a scale that represents the engine speed and a pointer that indicates a scale at a position corresponding to the engine speed. The tachometer control unit 30 controls the operation of the pointer of the tachometer 28 based on the engine speed detected by the engine speed sensor 26.
Further, the vehicle 1 includes a turbine rotational speed sensor 32 that detects the rotational speed (turbine rotational speed) of the output shaft of the torque converter 16, an accelerator position sensor 34 that detects the amount of depression of the accelerator pedal (accelerator opening), and the vehicle 1. A vehicle speed sensor 36 for detecting the speed of the vehicle, a shift-up switch 38 for receiving a manual operation for instructing the automatic transmission 4 to perform an upshift, and a shift-down switch 40 for receiving a manual operation for instructing the automatic transmission 4 to perform a downshift. A range sensor 42 for detecting the range of the selector for operating the automatic transmission 4 is mounted. Signals output from these sensors and switches are input to the control unit 44. The control unit 44 controls the transmission mechanism 18 and the lockup clutch 24 of the automatic transmission 4, the engine 2, the alternator 12, the air conditioner 14 and the like based on the input signal. Further, the control unit 44 outputs a signal to the tachometer control unit 30 that is referred to when the tachometer control unit 30 controls display by the tachometer 28. The control unit 44 includes a CPU, various programs that are interpreted and executed on the CPU (including basic control programs such as an OS and application programs that are activated on the OS to realize specific functions), programs, and various data. Is constituted by a computer having an internal memory such as a ROM or a RAM for storing.

Next, display control of the tachometer 28 by the tachometer control unit 30 will be described with reference to FIG.
FIG. 3 shows on the tachometer 28 when the change in the engine speed at the time of upshifting of the vehicle 1 equipped with the vehicle engine speed display device according to the embodiment of the present invention and the response to the engine speed are changed. It is a diagram which shows the change of the engine speed performed.

  The tachometer control unit 30 displays the engine speed detected by the engine speed sensor 26 on the tachometer 28 with a predetermined response. The tachometer control unit 30 changes the responsiveness according to ON / OFF of the responsiveness flag set by the control unit 44 in the display control process described later.

In FIG. 3, a solid line indicates a change in the actual engine speed detected by the engine speed sensor 26, and a broken line indicates a change in the engine speed indicated by the tachometer 28 when the responsiveness flag is ON. The two-dot chain line indicates the change in the engine speed indicated by the pointer of the tachometer 28 when the responsiveness flag is OFF.
As shown in FIG. 3, when the responsiveness flag is ON, the tachometer control unit 30 makes the responsiveness of the tachometer 28 higher than when the responsiveness flag is OFF. That is, when the responsiveness flag is ON, the tachometer control unit 30 operates the pointer of the tachometer 28 so as to follow the change in the engine speed more quickly than when the responsiveness flag is OFF.

Next, a lock-up region in which the control unit 44 performs the engagement control of the lock-up clutch 24 will be described with reference to FIG.
FIG. 4 is a map showing a lockup region in which the vehicle engine speed display device according to the embodiment of the present invention controls the lockup clutch to be engaged, using the vehicle speed and the accelerator opening as parameters. In the map of FIG. 4, the horizontal axis indicates the vehicle speed, and the vertical axis indicates the accelerator opening.

As shown in FIG. 4, the control unit 44 determines whether the current driving state of the vehicle 1 is the lock-up clutch 24 based on the vehicle speed detected by the vehicle speed sensor 36 and the accelerator opening detected by the accelerator position sensor 34. It is determined whether or not it is included in the lock-up region where the fastening control is performed.
For example, when the coordinate position corresponding to the vehicle speed and the accelerator opening is the position of the point A in the map of FIG. 4, the control unit 44 determines that the current driving state of the vehicle 1 is the engagement of the lockup clutch 24. When it is determined that the vehicle is not included in the lock-up area to be controlled and the coordinate position corresponding to the vehicle speed and the accelerator opening is the position of the point B, the current driving state of the vehicle 1 is the lock-up clutch 24. It is determined that it is included in the lock-up area where the fastening control is performed.

Next, a display control process performed by the vehicle engine speed display device according to the embodiment of the present invention will be described with reference to FIGS. 5 and 6.
FIG. 5 is a flowchart of a display control process performed by the vehicle engine speed display device according to the embodiment of the present invention. Further, FIG. 6 is set by the changes in the engine speed and the turbine speed during upshifting of the vehicle 1 equipped with the vehicle engine speed display device according to the embodiment of the present invention, and the vehicle engine speed display device. 6 is a timing chart showing changes in responsiveness flags. In FIG. 6, the horizontal axis indicates time, and the vertical axis indicates the engine speed (solid line and broken line), the turbine speed (one-dot chain line), and ON / OFF of the responsiveness flag.

  The display control process is started when the ignition of the vehicle 1 is turned on, and is repeatedly executed. At the start of the display control process, the responsiveness flag of the tachometer control unit 30 is set to OFF in advance.

  First, as shown in FIG. 5, when the display control process is started, in step S1, the control unit 44 causes the engine speed sensor 26, the turbine speed sensor 32, the accelerator position sensor 34, the vehicle speed sensor 36, and the upshifting. The signals output from the switch 38, the shift down switch 40, and the range sensor 42 are read.

Next, proceeding to step S2, the control unit 44 determines whether or not the vehicle 1 is traveling. In the present embodiment, the control unit 44 determines that the vehicle 1 is traveling when the vehicle speed detected by the vehicle speed sensor 36 is 5 km / h or more.
As a result, when the vehicle 1 is not traveling (the vehicle speed is less than 5 km / h), the change amount of the engine speed at the time of shifting of the automatic transmission 4 is small, so that the responsiveness of the display of the tachometer 28 is increased. The necessity is considered low. Therefore, the control unit 44 skips the subsequent processing and returns to step S1.

  On the other hand, if the vehicle 1 is traveling in step S2 (the vehicle speed is 5 km / h or more), the process proceeds to step S3, where the control unit 44 detects the vehicle speed detected by the vehicle speed sensor 36 and the accelerator position sensor 34. Based on the detected accelerator opening degree, it is determined whether or not the current operation state of the vehicle 1 is included in a lockup region in which the lockup clutch 24 is engaged. Specifically, the control unit 44 refers to the map illustrated in FIG. 4 and locks the coordinate position corresponding to the vehicle speed detected by the vehicle speed sensor 36 and the accelerator opening detected by the accelerator position sensor 34. It is determined whether it is included in the area.

  As a result, when the current operation state of the vehicle 1 is included in the lockup region where the lockup clutch 24 is engaged, that is, when the lockup clutch 24 is in the engagement state or the slip engagement state, the control unit 44 Skips the subsequent processing and returns to step S1.

On the other hand, if the current operating state of the vehicle 1 is not included in the lockup region where the lockup clutch 24 is engaged in step S3, that is, if the lockup clutch 24 is in the released state, the process proceeds to step S4. The control unit 44 determines whether or not the shift control of the automatic transmission 4 is being executed. Specifically, the control unit 44 outputs a shift command to the automatic transmission 4 in accordance with a manual operation input from the shift up switch 38 or the shift down switch 40, and then the hydraulic control of the transmission mechanism 18 by the oil pump 20 is performed. In the period until completion, it is determined that the shift control of the automatic transmission 4 is being executed.
As a result, when the shift control of the automatic transmission 4 is not being executed, the change speed of the engine speed is low, so that the necessity for increasing the responsiveness of the display on the tachometer 28 is considered low. Therefore, the control unit 44 skips the subsequent processing and returns to step S1.

On the other hand, when the shift control of the automatic transmission 4 is being executed in step S4, that is, after the shift command is input to the automatic transmission 4, the hydraulic control of the transmission mechanism 18 by the oil pump 20 is not completed. In step S5, the control unit 44 determines whether or not the phase of the shift operation by the automatic transmission 4 is an inertia phase. Specifically, the control unit 44 determines that the turbine rotational speed detected by the turbine rotational speed sensor 32 changes toward the target rotational speed after shifting of the automatic transmission 4 (the rotational speed decreases at the time of upshifting). In this case, it is determined that the inertia phase is in effect when the rotational speed has increased during the downshift. The target rotational speed after the shift of the automatic transmission 4 is calculated from the vehicle speed, the shift ratio after the shift of the automatic transmission 4 and the final reduction ratio.
For example, at the time of upshifting, as shown in FIG. 6, the control unit 44 determines that the inertia phase is in effect when the turbine rotational speed detected by the turbine rotational speed sensor 32 decreases.

  As a result, when the phase of the speed change operation by the automatic transmission 4 is not the inertia phase, the change speed of the engine speed is not an inertia phase, and therefore, it is considered less necessary to increase the responsiveness of the display of the tachometer 28. . Therefore, the control unit 44 skips the subsequent processing and returns to step S1.

  On the other hand, when the phase of the speed change operation by the automatic transmission 4 is the inertia phase in step S5, the process proceeds to step S6, and the control unit 44 sets the responsiveness flag of the tachometer control unit 30 to ON. As a result, the tachometer control unit 30 increases the responsiveness of the display of the tachometer 28 to the engine speed detected by the engine speed sensor 26.

  Next, the process proceeds to step S7, and the control unit 44 slips the lockup clutch 24. Specifically, the control unit 44 controls the engagement control hydraulic pressure supplied from the oil pump 20 to the lockup clutch 24, and causes the lockup clutch 24 to be slip-engaged at a predetermined slip ratio.

  When the lock-up clutch 24 is in the disengaged state, in the inertia phase at the time of upshifting, the engine speed slowly decreases with a delay from the change in the turbine speed as indicated by a broken line in FIG. On the other hand, when the control unit 44 slips the lockup clutch 24 in step S7, the engine speed follows the change in the turbine speed as shown by the broken line in FIG. And descends quickly. That is, the control unit 44 forcibly changes the engine speed toward the target speed after the shift of the automatic transmission 4 by slip-engaging the lockup clutch 24.

Next, proceeding to step S8, the control unit 44 determines whether or not the inertia phase has ended. Specifically, the control unit 44 determines that when the change in the turbine rotational speed toward the target rotational speed after the shift of the automatic transmission 4 has been completed (when the reduction of the rotational speed has been completed at the time of upshifting, It is determined that the inertia phase has ended when the increase in the rotation speed has ended.
For example, at the time of upshifting, as shown in FIG. 6, the control unit 44 determines that the inertia phase has ended when the turbine rotational speed detected by the turbine rotational speed sensor 32 starts from decreasing to increasing.

  As a result, if the inertia phase has not ended, the control unit 44 repeats step S8 until the inertia phase ends.

On the other hand, when the inertia phase is completed, the process proceeds to step S9, and the control unit 44 determines whether or not a predetermined time T ₁ (for example, 180 msec) has elapsed since it was determined in step S8 that the inertia phase was completed.
As a result, if the predetermined time has not elapsed after the inertia phase ends, the control unit 44 repeats step S9 until the predetermined time elapses.

On the other hand, when the end after a predetermined time T ₁ of the inertia phase has elapsed, the process proceeds to step S10, as shown in FIG. 6, the control unit 44 sets the response flag of the tachometer control unit 30 to OFF. Thereby, the tachometer control unit 30 lowers the responsiveness of the display of the tachometer 28 with respect to the engine speed detected by the engine speed sensor 26.

Next, in step S11, the control unit 44 releases the lockup clutch 24. Specifically, the control unit 44 controls the hydraulic pressure supplied from the oil pump 20 to the lockup clutch 24 to release the lockup clutch 24.
Thereafter, the control unit 44 returns to step S1.

Next, a further modification of the embodiment of the present invention will be described with reference to FIGS.
First, a display control process performed by the vehicle engine speed display device according to the first modification of the embodiment of the present invention will be described with reference to FIG.
FIG. 7 is a flowchart of a display control process performed by the vehicle engine speed display device according to the first modification of the embodiment of the present invention.

  As shown in FIG. 7, the display control process of the first modified example is shown in FIG. 5 in that the control unit 44 does not determine whether or not the phase of the shift operation by the automatic transmission 4 is an inertia phase. It is different from the display control process.

  That is, in the display control process of the first modified example, if the shift control of the automatic transmission 4 is being executed in step S34, whether or not the phase of the shift operation by the automatic transmission 4 is an inertia phase. In step S35, the control unit 44 sets the responsiveness flag of the tachometer control unit 30 to ON.

  Further, after the control unit 44 slips the lock-up clutch 24 in step S36, the control unit 44 does not determine whether the inertia phase has ended in step S37, but instead of determining whether or not the automatic transmission 4 has finished. It is determined whether or not the shift control is finished. Specifically, the control unit 44 calculates the speed ratio of the automatic transmission 4 based on the vehicle speed, the turbine rotational speed, and the final reduction ratio, and the calculated speed ratio is calculated after the shift of the automatic transmission 4. If it matches the target gear ratio, it is determined that the shift control of the automatic transmission 4 has been completed.

As a result, when the shift control of the automatic transmission 4 has not ended, the control unit 44 repeats step S37 until the shift control of the automatic transmission 4 ends.
On the other hand, when the shift control is completed, the process proceeds to step S38, and the control unit 44 determines whether or not a predetermined time T ₁ (for example, 180 msec) has elapsed since it was determined in step S37 that the shift control was completed.

Next, a display control process performed by the vehicle engine speed display device according to the second modification of the embodiment of the present invention will be described with reference to FIG.
FIG. 8 is a flowchart of a display control process performed by the vehicle engine speed display device according to the second modification of the embodiment of the present invention.

  As shown in FIG. 8, in the display control process of the second modification, the engine speed is automatically controlled by the control unit 44 not by the engagement control of the lockup clutch 24 but by the control of the auxiliary machinery driven by the engine 2. 7 is different from the display control process of the first modification shown in FIG. 7 in that the transmission 4 is forcibly changed toward the target rotational speed after the shift.

That is, in the display control process of the second modified example, after the control unit 44 sets the responsiveness flag of the tachometer control unit 30 to ON in step S55, the control unit 44 activates the lockup clutch 24 in step S56. Rather than slip fastening, control of the auxiliary machinery driven by the engine 2 is started. Specifically, the control unit 44 increases or decreases the load of the engine 2 by controlling the operation of auxiliary devices such as the alternator 12 driven by the engine 2, the compressor of the air conditioner 14, the oil pump, the fuel pump, and the water pump. Thus, the engine speed is forcibly changed toward the target speed after the shift of the automatic transmission 4.
In step S59, after the control unit 44 sets the responsiveness flag of the tachometer control unit 30 to OFF, the control of the auxiliary machines driven by the engine 2 is ended in step S60.

Next, display control processing performed by the vehicle engine speed display device according to the third modification of the embodiment of the present invention will be described with reference to FIG.
FIG. 9 is a flowchart of a display control process performed by the vehicle engine speed display device according to the third modification of the embodiment of the present invention.

  As shown in FIG. 9, in the display control process of the third modification example, the control unit 44 does not perform the engagement control of the lockup clutch 24 but the torque control of the engine 2 to change the engine speed after the automatic transmission 4 is shifted. 7 is different from the display control process of the first modified example shown in FIG. 7 in that it is forcibly changed toward the target rotational speed.

That is, in the display control process of the third modified example, after the control unit 44 sets the responsiveness flag of the tachometer control unit 30 to ON in step S75, the control unit 44 activates the lock-up clutch 24 in step S76. The control of the torque of the engine 2 is started instead of the slip fastening. Specifically, the control unit 44 controls the ignition timing, the fuel injection amount, the fuel injection timing, the intake air amount, the EGR (Exhaust Gas Recirculation) amount, etc. of the engine 2 to increase or decrease the torque of the engine 2. The rotational speed is forcibly changed toward the target rotational speed after shifting of the automatic transmission 4.
Further, after the control unit 44 sets the responsiveness flag of the tachometer control unit 30 to OFF in step S79, the control of the torque of the engine 2 is ended in step S80.

  In the above-described embodiment of the present invention, the control unit 44 outputs a shift command to the automatic transmission 4 in accordance with the manual operation input from the upshift switch 38 or the downshift switch 40 in step S4 of FIG. In the above description, it is determined that the shift control of the automatic transmission 4 is being executed and the forced change in the engine speed and the increase in the response of the tachometer display are executed. However, the control unit 44 is set in advance. If a shift command is output to the automatic transmission 4 according to the shift map for automatic transmission, it may be determined that the shift control of the automatic transmission 4 is being executed.

  Further, in the above-described embodiment of the present invention, the control unit 44, when the turbine rotational speed detected by the turbine rotational speed sensor 32 changes toward the target rotational speed after shifting of the automatic transmission 4, Although it has been determined that the inertia phase has been reached and it has been determined that the inertia phase has ended when the change in the turbine rotation speed toward the target rotation speed after the shift of the automatic transmission 4 has ended, it is determined that the inertia phase has ended. The start and end of the inertia phase may be determined based on the detected engine speed. That is, the control unit 44 determines that the inertia phase is in effect when the engine speed detected by the engine speed sensor 26 changes toward the target speed after the shift of the automatic transmission 4, and the automatic speed change is performed. When the change in the turbine rotational speed toward the target rotational speed after shifting of the machine 4 is completed, it may be determined that the inertia phase has been completed.

  In the above-described embodiment of the present invention and the first modification of the embodiment of the present invention, the driving state of the vehicle 1 is not included in the lockup region, and the shift control of the automatic transmission 4 is performed. The control unit 44 is described as slip-engaged at a predetermined slip rate when the control unit 44 is engaged. However, the lock-up clutch 24 may be completely engaged.

  Further, in the above-described embodiment of the present invention and the modification of the embodiment of the present invention, the case where the vehicle engine speed display device displays a change in the engine speed at the time of the upshift is described as an example. The present invention can be applied to the case of displaying the change in the engine speed at the time of shifting as well as at the time of upshifting.

  Next, functions and effects of the above-described embodiment of the present invention and the vehicle engine speed display device according to the modification of the embodiment of the present invention will be described.

  First, when the driving state of the vehicle 1 is not included in the lockup region and the shift control of the automatic transmission 4 is being performed, the control unit 44 changes the engine speed to the shift of the automatic transmission 4. The control unit 44 and the tachometer control unit 30 forcibly change the target rotational speed later, and the responsiveness of the display of the tachometer 28 to the engine rotational speed detected by the engine rotational speed sensor 26 is changed to the automatic transmission 4. Therefore, when the lockup clutch 24 is not controlled to be engaged during the shift of the automatic transmission 4, it is forcibly changed toward the target rotational speed after the shift. The engine speed to be displayed can be displayed on the tachometer 28 so that the change is conspicuous due to high responsiveness. Thereby, even when the driving state of the vehicle 1 is not included in the lockup region, the driver can visually perceive a sharp change in the engine speed at the time of shifting from the change in the display on the tachometer 28.

  Further, the control unit 44 forcibly controls the lockup clutch 24 to forcibly change the engine rotational speed toward the target rotational speed after shifting, so that the gear ratio of the automatic transmission 4 is changed. When the rotational speed of the turbine of the torque converter 16 changes, the rotational speed of the engine 2 connected to the turbine via the lock-up clutch 24 can be rapidly changed so as to follow the turbine rotational speed. As a result, a sharp change in the engine speed during gear shifting can be displayed on the tachometer 28 without a sense of incongruity.

  The control unit 44 slips the lock-up clutch 24 to forcibly change the engine speed toward the target speed after the shift. Therefore, when the automatic transmission 4 is shifted, the automatic transmission Even when the turbine speed of the torque converter 16 fluctuates due to fluctuations in the hydraulic pressure supplied to the fourth speed change mechanism 18, the fluctuations in the turbine speed can be absorbed by the slip of the lockup clutch 24. As a result, when the control unit 44 forcibly changes the engine speed toward the target speed after the shift, it is possible to suppress the engine speed from changing in an unstable manner, and the driver feels uncomfortable. This can be prevented.

Further, since the control unit 44 controls the engagement of the lockup clutch 24 when the phase of the speed change operation of the automatic transmission 4 is the inertia phase, the period during which the engagement control of the lockup clutch 24 is performed is determined during the engine speed. It can be limited to the inertia phase where rapid changes are expected. That is, since the period during which the oil pump 20 supplies the hydraulic pressure to the lockup clutch 24 can be limited to a period when the necessity for the engagement control of the lockup clutch 24 is high, the control unit 44 controls the engagement of the lockup clutch 24. The enlargement of the oil pump 20 due to the operation can be avoided.
Further, since the control unit 44 and the tachometer control unit 30 increase the display responsiveness of the tachometer 28 when the shift operation phase of the automatic transmission 4 is the inertia phase, a rapid change in the engine speed is expected. In the inertia phase, the responsiveness of the display of the tachometer 28 can be increased, and thereby the engine speed can be displayed on the tachometer 28 so that the change of the engine speed during the shift is conspicuous.

  When the shift operation of the automatic transmission 4 is performed on the shift up switch 38 or the shift down switch 40, the control unit 44 controls the lockup clutch 24 to be engaged, and the control unit 44 and the tachometer control unit 30 Since the responsiveness of the display of the tachometer 28 is increased, when the driver expects the change in the engine speed due to the shift of the automatic transmission 4 to be displayed on the tachometer 28, the responsiveness toward the target speed after the shift is reached. Thus, the engine speed that is forcibly changed can be displayed on the tachometer 28 so that the change is conspicuous due to high responsiveness.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Engine 4 Automatic transmission 6 Differential gear 8 Drive wheel 10 Battery 12 Alternator 14 Air conditioner 16 Torque converter 18 Transmission mechanism 20 Oil pump 22 Torus 24 Lock-up clutch 26 Engine speed sensor 28 Tachometer 30 Tachometer control part 32 Turbine speed Sensor 34 Accelerator position sensor 36 Vehicle speed sensor 38 Shift up switch 40 Shift down switch 42 Range sensor 44 Control unit

Claims (6)

An engine, an automatic transmission having a torque converter with a lock-up clutch connected to the engine, an automatic transmission control means for controlling the automatic transmission, and an operating state detecting means for detecting the operating state of the vehicle; A lockup area determination means for determining whether or not the driving state of the vehicle detected by the driving state detection means is included in a lockup area for performing the engagement control of the lockup clutch, and the lockup area determination. And a vehicle engine having a lockup control means for controlling the engagement of the lockup clutch when the driving state of the vehicle is determined to be included in the lockup region. A rotational speed display device,
An engine speed detecting means for detecting the engine speed;
Engine speed display means for displaying the engine speed;
Display control means for controlling display by the engine speed display means based on the engine speed detected by the engine speed detection means,
The display control means includes
When it is determined by the lockup region determination means that the driving state of the vehicle is not included in the lockup region, and the shift control of the automatic transmission is performed by the automatic transmission control unit, the engine An engine speed forcibly changing means for forcibly changing the speed toward the target speed after shifting of the automatic transmission;
When it is determined by the lockup area determination means that the driving state of the vehicle is not included in the lockup area, and the automatic transmission control means is performing shift control of the automatic transmission, Responsiveness increasing means for increasing the responsiveness of the display of the engine speed display means with respect to the engine speed detected by the engine speed detecting means than when the shift control of the automatic transmission is not performed;
A vehicle engine rotation speed display device comprising:   2. The engine speed forcibly changing means causes the lockup clutch to be engaged and controlled by the lockup control means so as to forcibly change the engine speed toward the target speed after the shift. Vehicle engine speed display device.   3. The engine speed forcibly changing means slip-engages the lockup clutch by the lockup control means so as to forcibly change the engine speed toward the target speed after the shift. Vehicle engine speed display device. The vehicle engine speed display device displays the engine speed of a vehicle having the automatic transmission that includes an oil pump that is driven by an engine and supplies an engagement control hydraulic pressure to the lockup clutch,
The inertial phase for determining whether or not the phase of the shift operation of the automatic transmission is an inertia phase when the shift control of the automatic transmission is being performed by the automatic transmission control unit. Having a judging means,
The engine speed forcibly changing means moves the engine speed toward the target speed after the shift when the inertia phase determining means determines that the phase of the shift operation of the automatic transmission is the inertia phase. The lock-up clutch is controlled to be engaged by the lock-up control means,
The responsiveness increasing means increases the responsiveness of the display of the engine speed display means when the inertia phase determining means determines that the phase of the shifting operation of the automatic transmission is an inertia phase. Item 4. The vehicle engine speed display device according to Item 2 or 3. The vehicle engine speed display device displays the engine speed of a vehicle having a manual shift operation means for a driver to perform a shift operation of the automatic transmission,
The engine speed forcibly changing means forcibly changes the engine speed toward the target speed after the shift when a shift operation of the automatic transmission is performed on the manual shift operation means. The lockup clutch is controlled to be engaged by the lockup control means,
The responsiveness increasing means increases the responsiveness of the display of the engine speed display means when a shift operation of the automatic transmission is performed on the manual shift operation means. The vehicle engine speed display device according to claim 1. An engine, an automatic transmission having a torque converter with a lock-up clutch connected to the engine, an automatic transmission control means for controlling the automatic transmission, and an operating state detecting means for detecting the operating state of the vehicle; A lockup area determination means for determining whether or not the driving state of the vehicle detected by the driving state detection means is included in a lockup area for performing the engagement control of the lockup clutch, and the lockup area determination. Means for controlling the engagement of the lock-up clutch when the driving state of the vehicle is included in the lock-up region. There,
Detecting the engine speed;
Controlling display by the engine speed display device based on the detected engine speed,
The step of controlling display by the engine speed display device is as follows:
When it is determined by the lockup region determination means that the driving state of the vehicle is not included in the lockup region, and the shift control of the automatic transmission is performed by the automatic transmission control unit, the engine Forcibly changing the rotational speed toward the target rotational speed after shifting of the automatic transmission;
When it is determined by the lockup area determination means that the driving state of the vehicle is not included in the lockup area, and the automatic transmission control means is performing shift control of the automatic transmission, Increasing the responsiveness of the display of the engine speed display device with respect to the detected engine speed as compared to when the shift control of the automatic transmission is not performed;
A control method for a vehicle engine speed display device.

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