JP6840565B2 - Transmission controller, control method and program - Google Patents

Description

The present invention relates to a transmission control device, a control method and a program, and is particularly suitable for application to a transmission control device, a control method and a program for engaging and disengaging a clutch while switching a transmission gear.

Conventionally, a transmission control unit (TCU) that controls the operation of a transmission is known. For example, Patent Document 1 discloses a TCU that controls the operation of a dual clutch transmission.

Specifically, when the vehicle decelerates while traveling on an uphill road and then re-accelerates, all of the multiple gears in the transmission are left unselected, and the gears are gears that match the re-acceleration. A TCU that shifts gears is disclosed.

According to this Patent Document 1, since it is not necessary to shift the gears step by step to the deceleration side and shift gears to the gears corresponding to the reacceleration in order, it is possible to quickly shift to the gears corresponding to the reacceleration. .. Therefore, it is possible to suppress a decrease in vehicle speed or a vehicle retreat when the vehicle decelerates on an uphill road and then re-accelerates.

Japanese Unexamined Patent Publication No. 2013-21537

By the way, the transmission includes a plurality of gears corresponding to a plurality of gears. For example, when the gear is 1st gear, a gear corresponding to 1st gear is provided, and when the gear is 2nd gear, a gear corresponding to 2nd gear is provided. In addition, it is configured with gears corresponding to each of the 3rd, 4th, 5th, 6th and reverse gears.

The transmission then outputs a desired drive torque by engaging the gears corresponding to the gears. When actually engaging the gears corresponding to the shift stages, the TCU first outputs a shift request instructing the gear shift unit (GSU: Gear Shift Unit) to shift from the first gear to the second gear, for example.

The GSU then operates one of the plurality of switching valves in the GSU in response to a shift request from the TCU to switch the path for transmitting the drive torque from the engine. This causes the desired gear in the transmission to engage.

Here, if the switching valve in the GSU fails for some reason, it is conceivable that a gear different from the desired gear is engaged in the transmission.

For example, if a problem occurs in a single switching valve that switches between any gear corresponding to the forward gear (1st to 6th gear) and the gear corresponding to the reverse gear (reverse), the direction is opposite to the driver's intention. There is a problem that the vehicle starts. Further, if a problem occurs in a plurality of switching valves that switch between the forward stages, a sudden shift such as 1st speed to 6th speed is performed. In such a case, there arises a problem that the safety of the vehicle and the driver cannot be sufficiently achieved.

The present invention has been made in consideration of the above points, and when a gear different from the gear corresponding to the target shift stage is engaged and a sudden shift is performed, the safety of the vehicle and the driver It proposes a transmission control device, a control method, and a program that can sufficiently secure the above.

In order to solve this problem, in the present invention, the gear of the transmission (60) is switched based on the current vehicle speed (S1), the actual accelerator opening (S2), and the shift request (S3). In the transmission control device (40) that controls the shift processing, the target shift stage (S11) calculated based on the vehicle speed (S1), the accelerator opening (S2), and the shift request (S3), and the target shift stage (S11). Output from the engine (100) when the actual gears after the gears are switched based on S11) are the forward gear and the reverse gear, respectively, or when the gears are the reverse gear and the forward gear, respectively. The drive torque (N) is cut.

According to the present invention, when a gear different from the gear corresponding to the target gear is engaged and a sudden shift is performed, the safety of the vehicle and the driver can be sufficiently ensured.

It is an overall block diagram of the transmission system in this embodiment. It is an internal block diagram of a GSU and a transmission. It is a functional block diagram of TCU. It is a flowchart of a gear position abnormality monitoring process.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. The embodiments described below are embodiments of the present invention, and the present invention is not limited to the following embodiments.

(1) Overall Configuration FIG. 1 shows the overall configuration of the transmission system 1 according to the present embodiment. The transmission system 1 is a system that executes control related to shifting of a vehicle, and is, for example, an AMT (Automated Manual Transmission) system that automatically engages or disengages a clutch without a driver's clutch operation.

The transmission system 1 includes a vehicle speed sensor 10, an accelerator opening sensor 20, a change lever unit (CLU: Change Lever Unit) 30, a transmission control unit (TCU: Transmission Control Unit) 40, a gear shift unit (GSU: Gear Shift Unit) 50, and the like. It includes a transmission 60, a GSU sensor 70, a clutch actuator (CA: Clutch Actuator) 80, a clutch 90, an engine 100, a display 110, and the like.

The vehicle speed sensor 10 detects the rotation of the axle, generates a vehicle speed signal, and outputs this as the current vehicle speed (S1) to the TCU 40. The accelerator opening sensor 20 detects the depression amount and depression speed of the accelerator pedal, generates an accelerator opening signal, and outputs this as an actual accelerator opening (S2) to the TCU 40.

The CLU 30 includes a change lever operated by a driver and a sensor that detects the position of the change lever. The position of the change lever includes, for example, 1st to 6th speed (forward stage) and reverse (reverse stage). The CLU 30 outputs the position signal of the change lever detected by the sensor to the TCU 40 as a shift request (S3) from the driver.

The TCU 40 includes a CPU (Central Processing Unit), a memory, and the like. When the shift request (S3) from the CLU 30 is input, the TCU 40 calculates the target shift stage based on the shift request (S3), the current vehicle speed (S1), and the accelerator opening (S2). Then, a signal instructing the calculated target shift stage to switch gears is generated, and this is output to the GSU 50 as a switching request (S5).

The GSU 50 is a hydraulic gear shift unit, and includes a plurality of electromagnetic switching valves, a shift cylinder, a striker, and the like. The GSU 50 will be described here as being a hydraulic gear shift unit, but the present invention is not limited to this, and may be, for example, a pneumatic or motor gear shift unit.

When the switching request (S5) from the TCU 40 is input, the GSU 50 operates the switching valve for which the switching request (S5) is input among the plurality of switching valves.

When the switching valve operates, the hydraulic fluid is supplied or discharged to the shift cylinder leading to the switching valve. Along with this, the piston in the shift cylinder moves in the axial direction by a predetermined distance, and the striker attached to the piston also moves in the same direction (select operation).

After moving in the axial direction, the striker rotates by a predetermined distance (shift operation). As a result, the gears of the shift stage corresponding to the position of the striker are engaged, and the shift process is executed in the transmission 60. As a result, the transmission 60 outputs a desired drive torque according to the shift request (S3) from the driver.

In this embodiment, when the transmission 60 outputs a drive torque different from the target shift calculated based on the shift request (S3) from the driver, the clutch 90 is attempted to be disengaged. To do.

For example, when the drive torque of the shift gear in the direction opposite to the target shift gear calculated based on the shift request (S3) is to be output from the transmission 60, or in the same direction as the target shift gear but constant. When the drive torque from the gears separated from each other is output from the transmission 60, the clutch 90 is to be disengaged.

The transmission 60 is, for example, an AMT and includes a plurality of gears corresponding to the 1st to 6th speeds and the reverse gears. The select operation and shift operation of the GSU 50 are executed under the control of the TCU 40, and the clutch 90 is automatically connected or disconnected to engage the gears of the desired shift stage and drive torque from the engine 100. Is output.

The GSU sensor 70 is a sensor that constantly monitors the position of the striker of the GSU 50. That is, the GSU sensor 70 monitors the actual gears engaged by the transmission 60, and monitors the actual gears. The GSU sensor 70 detects the position of the striker that moves as the GSU 50 operates the switching valve, and outputs a position signal (S4) to the TCU 40.

The TCU 40 makes a further switching request (S5) to the GSU 50 based on the current shift stage indicated by the position signal (S4), the vehicle speed (S1), the accelerator opening (S2), and the shift request (S3). Output and operate any switching valve of GSU50. As a result, it is possible to automatically control the shift stage suitable for the traveling state of the vehicle. Further, the TCU 40 outputs a disconnection / disconnection request (S6) to the CA80 as a signal instructing the connection or disconnection of the clutch 90.

The CA80 comprises a piston that operates on a fluid pressure such as hydraulic or pneumatic pressure. When the CA80 inputs the disconnection / disconnection request (S6) from the TCU40, the CA80 operates the piston to mechanically disconnect and connect the clutch 90 based on the disconnection / disconnection request (S6).

The clutch 90 is a dual clutch including, for example, two clutches, an inner clutch and an outer clutch. The clutch 90 smoothly transmits the drive torque from the engine 100 to the transmission 60 by alternately disengaging and connecting these two clutches by the drive operation of the CA 80.

The engine 100 is, for example, an internal combustion engine that generates drive torque by burning fuel in a cylinder. The fuel may be gasoline or diesel as long as it can generate driving torque, and is not particularly limited here.

The display 110 includes a display for displaying characters or images. When the display instruction (S7) from the TCU 40 is input, the display 110 displays the current shift stage based on the display instruction (S7). Further, in the present embodiment, when the target shift stage calculated by the TCU 40 and the actual shift stage after being switched by the target shift stage do not match, based on the display instruction (S7) from the TCU 40, Display a warning that the gear position is abnormal.

(2) Internal configuration of GSU and transmission FIG. 2 shows the internal configuration of GSU 50 and transmission 60. The GSU 50 includes a plurality of electromagnetic switching valves 501, a shift cylinder 502 and a striker 503. Hereinafter, a case where the first switching valve 5011 of the switching valves 501 inputs the switching request (S5) from the TCU 40 will be described.

The first switching valve 5011 is a switching valve that switches between the forward stage and the reverse stage. When a switching request (S5) is input from the TCU 40, the hydraulic fluid sucked up from the reservoir tank by the operation of a pump (not shown) is supplied to the shift cylinder 502. On the contrary, the hydraulic fluid is sucked up from the shift cylinder 502 and discharged to the reservoir tank.

Specifically, when the switching request (S5) from the TCU 40 to the reverse stage is input to the first switching valve 5011, the hydraulic fluid is supplied to the first hydraulic chamber 5021 which is liquid-tightly partitioned in the shift cylinder 502. The supply and discharge of the hydraulic fluid are switched so that the hydraulic fluid is supplied and the hydraulic fluid is discharged from the second hydraulic chamber 5022. As a result, the striker 503 moves to the right.

On the other hand, when the switching request (S5) from the TCU 40 to the forward stage is input to the first switching valve 5011, the hydraulic fluid is supplied to the second hydraulic chamber 5022 which is liquid-tightly partitioned in the shift cylinder 502. The supply and discharge of the hydraulic fluid are switched so that the hydraulic fluid is supplied and the hydraulic fluid is discharged from the first hydraulic chamber 5021. This causes the striker 503 to move to the left.

The position of the striker 503 is constantly monitored by the GSU sensor 70, and when the striker 503 moves to the right or left, the moved position is detected by the GSU sensor 70 and a position signal (S4) is output to the TCU 40. .. The TCU 40 can determine the actual shift stage based on this position signal (S4).

For example, when the striker 503 moves to the left, the drive torque N output from the engine 100 is transmitted to the forward gear 601. In this case, the drive torque N is transmitted to the wheels via the differential device, and the vehicle moves forward. On the other hand, when the striker 503 moves to the right, the drive torque N from the engine 100 is transmitted to the reverse gear 602, and the vehicle moves backward.

As described above, the first switching valve 5011 is a single switching valve that switches between the forward stage and the reverse stage. Therefore, if the first switching valve 5011 fails for some reason, there may be a problem that the shift stage to be switched is switched to the shift stage in the opposite direction by the switching request (S5).

Further, the second switching valve 5012 and the third switching valve 5013 are switching valves for switching different speeds among the forward speeds of the 1st to 6th speeds, for example. Therefore, if the second switching valve 5012 and the third switching valve 5013 fail for some reason, there may be a problem that the shift stage to be switched is switched to a shift stage separated by a certain amount or more by the switching request (S5).

In the present embodiment, when the shift gears are switched in the direction opposite to the direction intended by the driver due to the malfunction of the switching valves 501 to 5013, or the shift gears are switched to a shift gear separated from the current shift gear by a certain amount or more. It is intended to ensure sufficient safety of the vehicle and the driver in the case of replacement.

(3) Functional configuration of TCU FIG. 3 shows the functional configuration of TCU 40. The TCU 40 includes a target speed change determination unit 41, a GSU drive unit 42, a gear position abnormality monitoring unit 43, an indicator drive unit 44, a clutch drive unit 45, and the like. Each of these parts 41 to 45 may be realized by either hardware resources or software resources.

The target shift stage determination unit 41 inputs the current vehicle speed (S1) from the vehicle speed sensor 10, the accelerator opening degree (S2) from the accelerator opening sensor 20, and the shift request (S3) from the CLU30, and based on these. The target shift stage (S11) is calculated. Then, this target shift stage (S11) is output to the GSU drive unit 42 and the gear position abnormality monitoring unit 43.

The GSU drive unit 42 inputs the target shift stage (S11) from the target shift stage determination unit 41 and the current shift stage indicated by the position signal (S4) from the GSU sensor 70, and inputs the target shift stage (S11). And, based on the difference from the current shift stage, the drive amount of the GSU 50 is calculated.

Then, the GSU drive unit 42 generates a switching request (S5) based on the calculated drive amount, and outputs this to the GSU 50. When the switching request (S5) is input, the GSU 50 operates the switching valve 501 to move or rotate the striker 503 as described above. This engages the desired gear in the transmission 60.

The gear position abnormality monitoring unit 43 has a target shift stage (S11) from the target shift stage determination unit 41 and a position signal (S4) after the gear is switched based on the target shift stage (S11), that is, a shift disconnection. Monitors the presence or absence of abnormal gear positions based on the actual speed change after switching.

The gear position abnormality monitoring unit 43 generates a gear position abnormality signal (S12) when the target shift stage (S11) and the actual shift stage after the shift stage is switched do not match, and the display drive unit 44 Output to. In this case, the gear position abnormality monitoring unit 43 generates a clutch disengagement request (S13) and outputs the clutch disengagement request (S13) to the clutch drive unit 45.

When the display drive unit 44 inputs the position signal (S4) from the GSU sensor 70, the display drive unit 44 generates a display instruction (S7) for displaying the current shift stage, and outputs this to the display 110. Further, when the display drive unit 44 inputs the gear position abnormality signal (S12) from the gear position abnormality monitoring unit 43, the display drive unit 44 generates a display instruction (S7) warning that the gear position is abnormal and displays this. Output to the device 110.

When the clutch disengagement unit 45 inputs the clutch disengagement request (S13) from the gear position abnormality monitoring unit 43, the clutch drive unit 45 generates a disengagement request (S6) requesting disengagement of the clutch 90 and outputs this to the CA80.

(4) Flowchart FIG. 4 shows a flowchart of the gear position abnormality monitoring process according to the present embodiment. This gear position abnormality monitoring process is executed by the gear position abnormality monitoring unit 43 or in collaboration with the gear position abnormality monitoring unit 43 and the CPU. For convenience of explanation, the processing subject will be described as TCU40.

The TCU 40 compares the target shift with the actual shift after being switched by the target shift, and determines whether or not they match (SP1). The target shift is calculated based on the current vehicle speed, accelerator opening, and shift request (see FIG. 3). Further, the actual shift stage is acquired based on the position signal from the GSU sensor 70 (see FIG. 3).

When the TCU 40 obtains an affirmative result in this determination (SP1: Y), the TCU 40 ends this process. On the other hand, when a negative result is obtained (SP1: N), the TCU 40 executes clutch disengagement (SP2) and ends this process. When the clutch is disengaged, the TCU 40 generates a clutch disengagement request and outputs this to the CA80 (see FIG. 3).

(5) Effect of the present embodiment As described above, according to the present embodiment, the target shift stage (S3) calculated based on the current vehicle speed (S1), accelerator opening (S2), and shift request (S3). S11) is compared with the actual gear after the gear is switched by this target gear (S11), and if they do not match, the clutch 90 is disengaged. It is possible to prevent shifting and sufficiently ensure the safety of the vehicle and the driver.

In particular, according to the present embodiment, when the target gear (S11) is the forward gear and the actual gear is the forward gear after the gears are switched by the target gear (S11), and When both gears are different (for example, when the first gear and the sixth gear are different), the clutch 90 can be disengaged to prevent sudden shifting and sufficiently ensure the safety of the vehicle and the driver.

1 Transmission system 10 Vehicle speed sensor 20 Accelerator opening sensor 30 CLU (change lever unit)
40 TCU (Transmission Controller)
50 GSU (Gear Shift Unit)
60 Transmission 70 GSU Sensor 80 CA (Clutch Actuator)
90 Clutch 100 Engine 110 Indicator

Claims (5)

The transmission control device (40) that controls the shifting process by switching the gear of the transmission (60) based on the current vehicle speed (S1), the actual accelerator opening (S2), and the shifting request (S3). In
The gear was switched based on the target shift stage (S11) calculated based on the vehicle speed (S1), the accelerator opening degree (S2), and the shift request (S3), and the target shift stage (S11). The drive torque (N) output from the engine (100) is cut off when the actual rear gears are the forward gear and the reverse gear, respectively, or when the rear gears are the reverse gear and the forward gear, respectively. A transmission control device characterized by being controlled. When both the target gear (S11) and the actual gear after the gear is switched based on the target gear (S11) are forward gears and the gears do not match, the above. The transmission control device according to claim 1, wherein the drive torque (N) output from the engine (100) is controlled to be cut off. The transmission control device (40) is
Claim 1 or 2 is characterized in that the drive torque (N) output from the engine (100) is controlled to be disengaged by operating the clutch actuator (80) to disengage the clutch (90). The transmission control device described in. The transmission control device (40) that controls the shifting process by switching the gear of the transmission (60) based on the current vehicle speed (S1), the actual accelerator opening (S2), and the shifting request (S3). In the control method of
The transmission control device (40)
The gear was switched based on the target shift stage (S11) calculated based on the vehicle speed (S1), the accelerator opening degree (S2), and the shift request (S3), and the target shift stage (S11). The first step to compare with the actual gears later,
As a result of comparison, when the target gear (S11) and the actual gear are the forward gear and the reverse gear, respectively, or when they are the reverse gear and the forward gear, the output is output from the engine (100). A control method comprising a second step of controlling the drive torque (N) to be cut off. A transmission control device (40) that controls shifting processing by switching gears of the transmission (60) based on the current vehicle speed (S1), the actual accelerator opening (S2), and the shifting request (S3). On your computer
The gear was switched based on the target shift stage (S11) calculated based on the vehicle speed (S1), the accelerator opening degree (S2), and the shift request (S3), and the target shift stage (S11). With the ability to compare with the actual gears later,
As a result of comparison, when the target gear (S11) and the actual gear are the forward gear and the reverse gear, respectively, or when the gear gear is the reverse gear and the forward gear, the output is output from the engine (100). A program characterized by realizing a function of controlling the drive torque (N) to be cut off.

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