JP4789498B2 - Shift mode control device for automatic transmission - Google Patents

Description

  The present invention relates to a shift mode control device for an automatic transmission, and more particularly to control of an automatic transmission connected to an engine mounted on a vehicle, and an input of a shift mode switch linked to operation of a lever related to the transmission. Automatic transmission capable of detecting a state and switching to various shift modes, determining whether a manual shift mode switch has failed, and performing shift control in manual shift mode even after the failure is determined The present invention relates to a shift mode control apparatus.

  Conventionally used continuously variable transmissions change the state of the transmission mechanism provided between the input member and the output member, thereby continuously changing the rotation speed ratio between the input member and the output member. That is, it is a power transmission device configured to be able to change steplessly. A belt type continuously variable transmission, a toroidal type continuously variable transmission, and the like are known. In a vehicle equipped with this type of continuously variable transmission, the speed on the input side of the continuously variable transmission, that is, the engine speed is minimized so that the fuel consumption is minimized by appropriately changing the gear ratio during traveling. Therefore, the fuel consumption of the vehicle can be improved.

  The control of a continuously variable transmission that emphasizes fuel efficiency is automatically executed based on the driving state of the vehicle, such as required driving force and vehicle speed. It is not always possible to obtain the acceleration force and braking force intended by the driver. Therefore, a control device configured to change the gear ratio of the continuously variable transmission based on manual operation has been developed in the past in order to increase the degree of freedom of control of the gear ratio and obtain the intended acceleration force and braking force. Has been.

  As an example, the operation stroke of the shift lever device is detected by a potentiometer, and the minimum torque ratio by the continuously variable transmission is set to increase as the stroke amount from the high position side to the low position side of the shift lever device increases. It is configured. Here, the torque ratio is a ratio corresponding to the transmission ratio of the continuously variable transmission or a ratio that increases or decreases in accordance with the transmission ratio. In this control device, in addition to being able to select an operation (D) range in which the gear ratio is automatically set based on the driving state and a manual (M) range in which the gear ratio is set by manual operation, in the M range, The lower limit value of the gear ratio can be set arbitrarily.

  By the way, an automatic transmission having an operation system for switching between a D position which is an automatic transmission mode and an M position which is a manual transmission mode and an operation system for selecting a transmission range is known in recent years (for example, , See Patent Document 1). A configuration example of the shift mode control device for the automatic transmission is shown in FIG. 4, and the shift mode control device for the automatic transmission will be described below.

  FIG. 4 shows an example of the overall configuration of the power transmission system controlled by the transmission mode control device. An engine 1 that is a vehicle driving force source is connected to an automatic transmission 2, and the transmission 2 The output shaft is connected to left and right drive wheels (not shown) via a differential gear 3. Here, the engine 1 is an internal combustion engine such as a gasoline engine or a diesel engine, an electric motor such as a motor, and various driving force sources that can be used in a vehicle, such as a device that combines the internal combustion engine and the electric motor. Including. In order to reduce the driving force shown in FIG. 4, an electronic throttle valve that electrically controls the throttle opening is provided, and fuel is directly injected into the cylinder, and the injection amount and timing are controlled to achieve homogeneous combustion and stratification. A direct-injection gasoline engine capable of combustion can be used

  The engine 1 is configured to be electrically controlled, and is provided with an electronic control unit (ECU 1) 4 mainly including a microcomputer for the control. The electronic control unit 4 is configured to control at least the output of the engine 1. As data for the control, for example, the output shaft speed (engine speed) of the engine and the accelerator opening θ are input. In addition, control information necessary for engine control is input.

  These engine speed and accelerator opening are the main signals for increasing / decreasing the output of the engine 1, and the operation amount signal and the operation amount of the acceleration / deceleration operating device 7 such as an accelerator pedal operated by the driver. In addition to this, it is possible to adopt signals obtained by electrically processing the engine, as well as electronic throttle valve opening control signals, cruise control systems (not shown) for maintaining the vehicle speed at the set vehicle speed, etc. The control request signal from is included.

  The automatic transmission 2 includes a fluid transmission mechanism 21, a gear transmission mechanism 22, and a continuously variable transmission (CVT) 23. The fluid transmission mechanism 21 is configured to transmit torque between an input-side member and an output-side member via a fluid such as oil. As an example, a torque converter employed in a general vehicle is used. Can be mentioned. Further, a direct coupling clutch is provided in the fluid transmission mechanism 21. This direct coupling clutch is a clutch configured to directly connect an input side member and an output side member by mechanical means such as a friction plate, and is made of an elastic body such as a coil spring for buffering. A damper is also provided.

  The input member of the fluid transmission mechanism 21 is connected to the output member of the engine 1, and the output member of the fluid transmission mechanism 8 is connected to the input member of the gear transmission mechanism 22. This gear speed change mechanism 22 has a plurality of gears, and changes the rotation speed ratio between the input member and the output member, that is, the gear ratio, by changing the torque transmission path formed by these gears. Further, the output member is configured to rotate in the opposite direction with respect to the input member.

  As the gear transmission mechanism 22, for example, a single pinion type planetary gear mechanism, a double pinion type planetary gear mechanism, a mechanism using a Ravigneaux type planetary gear mechanism, or a plurality of gear pairs that are always meshed with each other is a synchronous coupling mechanism (synchronizer). ), A mechanism configured to selectively connect to an output member or an input member can be employed.

  The gear transmission mechanism 22 has a small speed ratio that can be set by the continuously variable transmission 23, and the continuously variable transmission 23 has a structure that rotates its output member in the opposite direction with respect to the input member. It is provided to compensate for the lack of a so-called reverse function. Therefore, when the gear ratio that can be set by the continuously variable transmission 23 satisfies the requirements for the vehicle, a mechanism having only the reverse function may be employed as the gear transmission mechanism 22.

  The continuously variable transmission 10 shown in FIG. 4 is a mechanism that can change the ratio of the rotation speed of the input member and the rotation speed of the output member, that is, the gear ratio continuously (continuously). The belt-type continuously variable transmission or toroidal-type continuously variable transmission described above can be employed. A stepped transmission may be used instead of the continuously variable transmission.

  Control of each state of engagement and disengagement of the direct coupling clutch in the automatic transmission mechanism 2 and half-engagement with slip, control of the gear ratio in the gear transmission mechanism 22, and control of the gear ratio in the continuously variable transmission 23 are basically Specifically, it is controlled based on the traveling state of the vehicle. For this control, an electronic control unit (ECU 2) 5 composed mainly of a microcomputer is provided.

  The electronic control unit 5 is connected to the above-described electronic control unit 4 for the engine so as to be able to perform data communication. On the other hand, as data necessary for the control, the vehicle speed detected by the vehicle speed detector 8 and the output speed detector 9 The data such as the output rotational speed of the automatic transmission 2 detected in step S1 is input. Further, the automatic transmission 2 is in a forward operation state in which the gear ratio is automatically set according to the stop state (parking: P), the reverse state (reverse: R), the neutral state (neutral: N), and the traveling state of the vehicle. (Drive: D) and a shift device 10 that is a shift operation device for selecting each state of a manual shift operation state (manual: M) in which a shift state can be set by a manual operation is provided. It is electrically connected to the control device 15. Further, when the manual shift mode is selected by the shift device 10, the gear ratio range (shift range) can be appropriately set, and range selection for selecting up / down of the shift range. A device 11 is provided.

  The shift device 10 can select each shift state described above by a manual operation device such as a shift lever, a shift arm or a dial provided on a floor, an instrument panel or a steering column near the driver's seat, and a stick, And it is comprised so that the signal according to each selected shifting state may be output. As an example, a device that can select each shift state by a shift lever is generally used. FIG. 5 shows an example of an arrangement of shift positions in the shift device.

  FIG. 5 shows lever operation positions corresponding to the respective states in the speed change operation device provided in the automatic vehicle. Here, the square frames indicated by the symbols P, R, N, and D indicate the parking position in the stopped state, the reverse position in the reverse state, the neutral position in the neutral state, and the drive position in the forward operation state, respectively. These positions are arranged linearly, and the shift device 10 is configured by these. These shift positions can be selected by moving the lever of the shift device 10 linearly.

  At each position, a switch that is turned on (energized) and off (non-energized) by a lever operation is arranged, and the input state of each switch is transmitted to the electronic control unit. Stop mode switch P for parking position in the stopped state, reverse mode switch R for reverse position in the reverse state, neutral mode switch N for neutral position in the neutral state, automatic shift for drive position in the forward operation state A mode switch D is provided. When the position is selected by lever operation, the switch is turned on, and the selected mode signal is transmitted to the electronic control unit 5 by this on operation.

  In addition, a manual shift mode is prepared for artificially setting a driving force and a braking force that cannot be obtained in the automatic shift mode as described above. In order to be able to select this manual transmission mode, a position for setting a manual operation state (manual: M) is provided at a position that is perpendicular to the arrangement direction of each position and is bent from the drive position. A range selection device 11 is configured. This manual position is provided with a manual shift mode switch M. When the shift lever is moved to this manual position, the switch M is turned on, and a signal indicating that the manual shift mode is selected. Is output.

  An up position (u) and a down position (d) are provided in a direction parallel to the arrangement direction of the parking or driving positions with the manual position interposed therebetween. Each of the up position and the down position is provided with an up shift request switch Su that is turned on by a shift lever and a down shift request switch Sd.

  When the up-gear request switch Su is turned on, the up-gear request switch Su outputs a signal for lowering the lower limit value of the settable gear ratio, that is, the lower limit value of the speed ratio on the high speed side to increase the speed ratio width. On the contrary, the request switch Sd is turned on to output a signal for increasing the lower limit value of the gear ratio that can be set, that is, the limit value of the gear ratio on the high speed side, and decreasing the gear ratio width. It is configured.

  Here, when the shift lever is set to the drive position, the automatic transmission mode switch D is turned on. However, when the shift lever is moved to the right side to the manual position, the automatic transmission mode switch D remains on. Thus, the manual shift mode switch M is configured to be turned on, and this configuration enables the selection of the up / down shift mode. In addition to the fact that the range selection device 11 is provided in the drive position of the shift device 10, for example, when the up-shift request switch Su, the down-shift request switch Sd and the steering wheel are manually operated, Convenience can be improved.

  Next, FIG. 6 shows a flowchart relating to the process of changing from the automatic transmission mode to the manual transmission mode or from the manual transmission mode to the automatic transmission mode in the automatic transmission control device shown in FIG. . Thus, the procedure of the change process will be described with reference to this flowchart.

  First, the electronic control device 5 detects the shift position of the shift lever by the driver from the shift device 10. At this time, it is determined whether only the automatic transmission mode switch D among the stop mode switch P, reverse mode switch R, neutral mode switch N, and automatic transmission mode switch D is on (step S1). Here, when the switches P, R, and N are on, the shift mode changing process is not required.

  Next, when only the switch D is not turned on, that is, when any of the switches P, R, and N is turned on (N in step S1), it indicates that the shift mode change processing is not necessary, Without changing the speed change mode, any one of the stop mode, the reverse speed mode, and the automatic speed change mode is set (step S6).

  On the other hand, when only the switch D is in the on operation, that is, when the shift lever is in the drive position (Y in step S1), it is determined whether or not the switch M has changed from the off operation to the on operation at this time. (Step S2).

  Here, when it is detected that the switch M has changed from the off operation to the on operation (Y in step S2), it is assumed that the driver desires to change to the manual transmission mode, and the transmission mode Is switched from the automatic transmission mode to the manual transmission mode (step S3).

  Therefore, the driver can select the upshift request mode or the downshift request mode in response to the manual shift mode, and shifts the vehicle to the manual operation state and travels. In this state, the electronic control unit 5 determines whether or not the switch M has changed from the on operation to the off operation (step S4).

  When it is not detected that the switch M is changed from the on operation to the off operation (N in Step S4), the switch D is turned on, the switch M is kept in the on operation, and the driver Since the vehicle is traveling in the automatic transmission mode, the transmission mode is not changed (step S6).

  When it is detected that the switch M has changed from the on operation to the off operation (Y in Step S4), it means that the driver has operated the shift lever to switch from the manual transmission mode to the automatic transmission mode. Then, the electronic control unit 5 performs control to switch the change mode from the manual shift mode to the automatic shift mode (step S5). At this time, it may be detected that any one of the switch P, the switch R, and the switch N is turned on.

  In this manner, according to the processing procedure of the flowchart of FIG. 6, the process of changing from the automatic transmission mode to the manual transmission mode or from the manual transmission mode to the automatic transmission mode is performed in the control device of the automatic transmission. By operating the shift lever, the required shift mode can be selected as appropriate, and the vehicle can be driven comfortably.

JP 2001-221338 A

  In the control of the change process from the automatic shift mode to the manual shift mode in the shift mode control device for the automatic transmission described above, the automatic shift mode switch D is turned on as a change condition from the automatic shift mode to the manual shift mode. And detecting that the manual transmission mode switch M has changed from the off operation to the on operation. After shifting to the manual shift mode, an up or down shift request is made by turning on the up shift request switch Su or the down shift request switch Sd by operating the shift lever.

  In other words, all of the automatic transmission mode switch D, the manual transmission mode switch M, the up transmission request switch Su, or the down transmission request switch Sd are used in the transition from the automatic transmission mode to the manual transmission mode and the execution of the subsequent transmission control. Normal operation is a prerequisite. Therefore, when there is an abnormality in the switch M, inconvenience as described below occurs in the driving operation of the driver.

  When driving the vehicle, the driver first confirms that the shift lever is in the parking position, and starts the engine when the stop mode switch P is on. When the engine is started, the shift lever is operated to turn on the automatic transmission mode switch D, the accelerator is depressed, the vehicle is started, and acceleration operation is performed. The electronic control device upshifts the automatic transmission and performs 4-speed output control in the automatic transmission mode.

  During automatic shift operation, if the driver wants to change the driving state to manual shift mode, for example, to run uphill, the automatic shift mode is changed when the shift lever is shifted from the drive position to the manual position. The switch D remains on, but the switch M does not turn on because the manual transmission mode switch M is out of order.

  However, since the driver does not know the failure of the switch M, it is assumed that the shift to the manual shift mode is performed by operating the lever, and the lever is operated to shift to the down shift mode. However, in the electronic control device, even if the down shift request switch Sd is turned on, the on operation of the switch M cannot be detected. Therefore, the automatic transmission is shifted to the manual shift mode and the shift control is not performed, and the automatic shift mode is maintained. Continue to control.

  Therefore, if the upper limit gear is reduced by one step by turning on the downshift request switch once, the driver notices that the downshift is not performed and operates the lever again to return to the manual position. Then try shifting to downshift mode. Only when such a lever operation is repeated, it is noticed that there is an abnormality in the lever operation system only when it is felt that the downshift does not occur. Therefore, the vehicle speed is decelerated and the abnormality is checked after the vehicle is stopped.

  The above is a case where the failure of the switch itself is a disconnection (non-conduction), but a problem occurs even when the failure is a short circuit (conduction). That is, there is a possibility that the electronic control unit determines that the shift to the manual shift mode is continued and erroneously executes the shift control of the automatic transmission. As described above, since it is difficult for the driver to accurately grasp the failure of the manual transmission mode switch, a wasteful lever operation is performed until the failure is noticed. Furthermore, the failure of the switch itself may not only reduce the driving performance but also reduce the driving safety.

  Therefore, the present invention improves the control logic of the shift control device of the automatic transmission, detects the signal state of the manual shift mode switch from the input state of the upshift request switch or the downshift request switch, and the switch is disconnected. Or, even in a short-circuited state, the automatic transmission mode requested by the driver can be changed to the manual transmission mode, and the shift of the automatic transmission can be controlled to the upshift request mode or the downshift request mode even after the change. An object is to provide a mode control device.

In order to solve the above problems, according to the present invention, in an automatic transmission shift mode control device, an electronic control device for controlling the shift mode of the automatic transmission, at least an automatic shift mode switch, and an up / down shift request switch A shift operation device including a manual shift mode switch, and when the electronic control unit detects a failure of the manual shift mode switch, the electronic control device changes the mode from an automatic shift to a manual shift or an automatic shift from a manual shift. The change mode of the automatic transmission is switched according to the input state of the automatic shift mode switch and the up / down shift request switch to control the shift mode of the automatic transmission.
In the present invention, an automatic shift provided in a vehicle having a shift operation device having at least a drive switch, an up / down shift request switch, and a manual switch as switches that are turned on / off according to the position of the shift lever. A shift mode control device for controlling a shift mode of a machine, wherein the shift operating device is configured such that both the manual switch and the drive switch are turned on when a shift lever is operated to a position where the manual switch is turned on. When the mode change condition for changing from the automatic transmission mode to the manual transmission mode is satisfied, that is, when the manual switch changes from OFF to ON, the transmission mode for changing the transmission mode to the manual transmission mode is set. Means to control and detect manual switch failure Failure detection means, and the means for controlling the shift mode is a mode change condition for changing from the automatic shift mode to the manual shift mode when a failure of the manual switch is detected by the failure detection means. Is switched to a condition in which the drive switch is on and the up / down shift request switch changes from off to on.

  The electronic control unit determines that the manual transmission mode switch is disconnected when it detects that the automatic transmission mode switch is turned on, the manual transmission mode switch is turned off, and the up / down transmission request switch is turned on. .

  The shift operation device may further include at least one stop mode switch, reverse mode switch, and neutral mode switch, and the electronic control unit may include the stop mode switch, the reverse mode switch, the neutral mode switch. When at least one of the mode switch and the automatic transmission mode switch is detected to be on, when the on of the manual transmission mode switch is detected, a short circuit failure of the manual transmission mode switch is determined.

  When the electronic control unit determines that the manual shift mode switch is faulty, the electronic control device sets a shift mode change condition from automatic shift control to manual shift control, sets the automatic shift mode switch on, and the up / down shift request switch I decided to turn it on.

  When the electronic control unit determines that the manual shift mode switch is malfunctioning, the electronic control unit determines whether the automatic shift mode switch is on and the manual shift mode switch is on. From the time of change from OFF to OFF, the automatic transmission mode switch is turned off, and any one of the stop mode switch, reverse mode switch, and neutral mode switch provided in the transmission operation device is changed to ON. did.

  When the electronic control unit determines that the manual shift mode switch is malfunctioning, the electronic control unit determines whether the automatic shift mode switch is on and the manual shift mode switch is on. When it is detected that at least one of the stop mode switch, reverse mode switch, and neutral mode switch provided in the shift operation device is turned on after detecting the stop state from the time when the vehicle is turned off. It was decided that.

  When the electronic control unit determines that the manual shift mode switch has failed, the shift mode change condition from manual shift control to automatic shift control is detected, the automatic shift mode switch is turned on, and the stop state is detected. It was decided that it would have been detected.

  When the electronic control unit determines that the manual transmission mode switch has failed, the electronic control unit instructs to notify the failure.

  When the electronic control unit determines that the automatic transmission mode switch is on when the disconnection failure of the manual transmission mode switch is determined, and detects that the manual transmission mode switch has changed from off to on, the electronic control unit It was determined that the manual shift mode switch has returned to the normal state.

  When the electronic control unit detects that the manual transmission mode switch is short-circuited, the electronic control unit detects that the automatic transmission mode switch is on and the manual transmission mode switch has changed from on to off. It was determined that the manual shift mode switch has returned to the normal state.

  The electronic control device gives an instruction for normal return when it is determined that the manual shift mode switch has returned to a normal state.

  The electronic control device gives an instruction to notify the switching when the mode change condition from the automatic shift to the manual shift or the mode change condition from the manual shift to the automatic shift is switched.

  In the control logic of the conventional shift lever, switch structure, and automatic transmission transmission mode control device, if the manual transmission mode switch is broken or short-circuited, the upshift request switch or the downshift request switch is normal. Even if it is possible to operate, it is not possible to change the output gear stage or the output upper limit gear stage, and enjoy the benefits of having a manual gear shift mode, for example, traveling like a manual shift. Can not.

  Also, in the case where the presence or absence of the engine brake is separated in the automatic transmission mode or the manual transmission mode, the engine braking effect can be obtained even if a downshift request is made when the manual transmission mode switch is out of order. Not only was it impossible, but the safety performance was also reduced.

  Therefore, according to the present invention having the above-described configuration, when the manual shift mode switch fails, the driver can change the automatic shift mode and the manual shift mode by changing the way of changing the automatic shift mode and the manual shift mode. As in the case of the state, it is possible to perform the change operation to the up change request mode or the down shift request mode and not only obtain a manual shift feeling but also allow the vehicle to travel without impairing the safety performance.

  Further, since the electronic control unit detects a signal input pattern that is impossible due to the structure of the lever and the switch, it is possible to accurately detect the failure of the manual transmission mode switch. By detecting a normal change in the input signal from the manual shift mode switch, it is possible to accurately detect that the switch has returned to normal, and to provide the driver with the original driving performance.

In addition, since the driver is notified of the failure or normal return of the manual shift mode switch and the change of the shift mode change condition, the driver can be urged to drive safely.
Note that the present invention has the same effects as described above regardless of whether the automatic transmission is a continuously variable transmission or a stepped transmission.

  Next, an embodiment of a shift mode control device for an automatic transmission according to the present invention will be described with reference to the drawings. The shift mode control device of the present embodiment can be applied to the shift control device of the automatic transmission shown in FIG. 4, and the shift mode control logic is an electronic control device provided in the shift control device. Executed in

  In the conventional shift control logic for the automatic transmission, even if the disconnection or short circuit abnormality has occurred in the manual shift mode switch, even if the up shift request switch or the down shift request switch can operate normally, the output shift It is not possible to change the speed or change the output upper limit gear, and for example, it is not possible to travel in the sense of a manual shift even though the manual speed change mode is provided. Alternatively, when the presence or absence of the engine brake is separated in the automatic transmission mode or the manual transmission mode, the engine braking effect can be obtained even if a downshift request is made when the manual transmission mode switch is out of order. It was impossible.

  Therefore, in the shift mode control for the automatic transmission according to the present embodiment, when the manual shift mode switch fails, the driver can switch the manual shift mode switch by switching the way of changing between the automatic shift mode and the manual shift mode. As in the normal state, the change operation to the up change request mode or the down shift request mode can be performed.

  Also, the electronic control unit detects the signal input pattern that is impossible due to the structure of the lever and the switch, accurately detects the failure of the manual transmission mode switch, and the input signal from the manual transmission mode switch is normal. By detecting a simple change, it is possible to accurately detect that the switch has returned to normal. Furthermore, the driver is notified of a failure or normal return of the manual shift mode switch and a change in the shift mode change condition.

  First, in the electronic control unit 5 shown in FIG. 4, the determination method related to the disconnection failure of the manual transmission mode switch M provided in the range selection device 11 and the determination operation of the failure recovery of the switch M are shown in FIG. This will be described with reference to the flowchart.

  The electronic control unit 5 determines whether or not it is detected that the manual transmission mode switch M is broken (OFF) at the present time (step S11). Here, when the disconnection failure of the switch M has already been detected (Y in step S11), it is determined whether only the automatic transmission mode switch D in the shift device 10 is on (step S12).

  When only the switch D is on (Y in Step S12), it is further determined whether or not the switch M is changed from the off operation to the on operation (Step S13). If the switch M has changed from the off operation to the on operation (Y in step S13), it is determined that there is no disconnection failure of the switch M (step S14). Here, it is confirmed that the switch M has returned to normal operation.

  When only the switch D is not turned on in step S12 (N in step S12), and in step S13, even if only the switch D is turned on, the switch M changes from the off operation to the on operation. If not (N in step S13), the determination operation as to whether or not the switch M has been returned is terminated.

  On the other hand, if a disconnection failure of the switch M is not detected at the present time in Step S11 (N in Step S11), it is determined whether only the switch D is on (Step S15). Here, when only the switch D is on (Y in step S15), it is determined whether or not the up-shift request switch Su or the down-shift request switch Sd is changed from the off operation to the on operation ( Step S16).

  Next, when it is a time when the switch Su or the switch Sd is changed from the off operation to the on operation (Y in step S16), it is determined whether or not the switch M is in the off operation (step S17). Here, when the switch M is in the OFF operation (step S17), it is determined that the switch M has a disconnection failure (step S18). Therefore, the disconnection failure determination operation related to the switch M is terminated, and the driver is notified of the disconnection failure of the switch M. Examples of notification methods include lamp lighting, message display on the panel, and voice notification.

  If only the switch D is not turned on in step S15 (N in step S15), and even if only the switch D is turned on in step S16, the switch Su or the switch Sd is turned off. If it is not at the time of changing to the on-operation (N in Step S16), and if the switch M is not in the off-operation (N in Step S17), the determination operation related to the disconnection failure of the switch M is terminated.

  In the above, the determination method related to the disconnection failure of the manual transmission mode switch M provided in the range selection device 11 and the determination operation of the failure recovery of the switch M have been described. A determination method relating to a short-circuit failure and a determination operation for returning the failure of the switch M will be described with reference to the flowchart of FIG.

  The electronic control unit 5 determines whether or not it is detected that the manual transmission mode switch M has a short circuit (ON) failure at the present time (step S21). Here, when the short-circuit failure of the switch M has already been detected (Y in step S21), it is determined whether only the automatic transmission mode switch D in the shift device 10 is in the ON operation (step S22).

  When only the switch D is on (Y in Step S22), it is further determined whether or not the switch M is changed from the on operation to the off operation (Step S23). If the switch M has changed from an on operation to an off operation (Y in step S23), it is determined that there is no short-circuit failure in the switch M (step S24). Here, it is confirmed that the switch M has returned to normal operation.

  If only the switch D is not turned on in step S22 (N in step S22), and even if only the switch D is turned on in step S23, the switch M changes from the on operation to the off operation. If not (N in step S23), the determination operation as to whether or not the switch M has been restored is terminated.

  On the other hand, if no short-circuit failure of the switch M is detected at the present time in step S21 (N in step S21), whether any of the stop switch P, the reverse switch R, or the neutral switch N is on. Is determined (step S25). Here, when any of the switches P, R, and N is on (Y in Step S25), it is determined whether or not the switch M is on (Step S26).

  Next, when the ON operation of the switch M is detected (Y in step S26), it is determined that the switch M has a short-circuit fault (step S27). Therefore, the determination operation of the short-circuit fault relating to the switch M is ended, and the short-circuit fault of the switch M is notified to the driver. Examples of notification methods include lamp lighting, message display on the panel, and voice notification.

  If none of the switches P, R, and N is turned on in step S25 (N in step S25), and further, any of the switches P, R, and N is turned on in step S26. If the switch M is off (N in step S26), the determination operation related to the short-circuit failure of the switch M is terminated.

  The determination method related to the short-circuit failure of the manual transmission mode switch M provided in the range selection device 11 and the determination operation of the failure recovery of the switch M have been described above. Next, even if the switch M is broken or short-circuited, the method of switching from the automatic transmission mode to the manual transmission mode or from the manual transmission mode to the automatic transmission mode will be described with reference to the flowchart of FIG. explain.

  Here, first, the shift mode change condition employed in the method of switching the shift mode will be described. In the conventional shift control logic for the automatic transmission, when the automatic shift mode is switched to the manual shift mode, the automatic shift mode switch D is turned on and the manual shift mode switch M is changed from an off operation to an on operation. As a mode change condition, when the manual transmission mode is switched to the automatic transmission mode, the automatic transmission mode switch D is turned on and the manual transmission mode switch M is changed from the on operation to the off operation.

  Since the shift mode change condition in the conventional control logic is based on the premise that the switch M is operating normally, if the switch M breaks down, the change of the shift mode is hindered. In the control logic of the shift mode control device of the mode, when the switch M is broken in the shift mode change condition, the operation state of the switch M is not included, and the shift mode based on the operation state of other switches Change conditions.

  Therefore, the shift mode change condition from the automatic shift mode to the manual shift mode is detected when the up shift request switch Su or the down shift request switch Sd is changed from the off operation to the on operation when the switch D is in the on operation. I have done that. Further, the shift mode change condition from the manual shift mode to the automatic shift mode is that the up shift request switch Su or the down shift request switch Sd is turned off when the switch D is turned off from the on operation. . The procedure of the shift mode control of the automatic transmission will be described below based on the control logic incorporating such a shift mode change condition.

  In the flowchart of FIG. 3, first, the electronic control unit 5 determines whether or not a short circuit or disconnection failure of the switch M has been detected according to the failure determination procedure of the manual transmission mode switch M shown in FIGS. A determination is made (step S31). Here, when a failure is not detected in the switch M (N in step S31), the automatic transmission is operated according to the normal shift mode changing condition, that is, the automatic / manual shift mode changing operation shown in the flowchart of FIG. Shift control is performed.

  Each of steps S32 to S37 in the flowchart of FIG. 3 corresponds to steps S1 to S6 in the flowchart of FIG. 6, and when the failure of the switch M is not detected, automatic and manual shifts that are the same as the normal shift mode change condition are performed. Since this is a mode change operation, the description thereof is omitted here.

  On the other hand, when a failure is detected in the switch M in step S31 (Y in step S31), it is determined whether only the switch D is on (step S41). Here, it is determined whether or not the upshift request switch Su or the downshift request switch Sd is changing from the off operation to the on operation (step S42).

  When the switch Su or the switch Sd is changing from the off operation to the on operation (Y in step S42), the shift mode is changed to the manual shift mode and the shift control is performed (step S43). The change process ends. In step S42, when the switch Su or switch Sd is not changing from the OFF operation to the ON operation (N in step S42), the shift mode is not changed and the automatic shift mode is maintained (step S44). The shift mode changing process is terminated.

  On the other hand, when the switch D is not turned on in step S41 (N in step S41), it is determined whether any of the stop switch P, the reverse switch R, or the neutral switch N is turned on (step S45). ). At this time, when none of the switches P, R, and N is turned on (N in step S45), the shift mode changing operation is not performed (step S44).

  If any of the switches P, R, and N is on (Y in step S45), the shift mode is set to the automatic shift mode and shift control is performed (step S46). The change process ends.

  Next, the shift mode change state and the psychological state of the driver driving the vehicle will be described when the shift mode change control logic for the automatic transmission is used.

  When the driver starts running of the vehicle, first, the driver first confirms that the shift lever is in the parking position, and starts the engine when the stop mode switch P is on. When the engine is started, the shift lever is operated to turn on the automatic transmission mode switch D, the accelerator is depressed, the vehicle is started, and acceleration operation is performed. The electronic control device upshifts the automatic transmission and performs 4-speed output control in the automatic transmission mode.

  During automatic shift operation, if the driver wants to change the driving state to manual shift mode, for example, to run uphill, the automatic shift mode is changed when the shift lever is shifted from the drive position to the manual position. The switch D remains on, but when the manual transmission mode switch M is out of order, the switch M does not turn on.

  However, since the driver does not know the failure of the switch M, it is assumed that the shift to the manual shift mode is performed by operating the lever, and the lever is operated to shift to the down shift mode. However, in the electronic control device, it is detected that the switch M is malfunctioning by the ON operation of the switch D and the ON operation of the downshift request switch Sd, and the electronic control device outputs a warning to the driver. Notify that.

  When the electronic control unit detects a failure of the switch M, it is assumed that the switch Sd is turned on and the manual shift mode is entered, and for example, control for downshifting from the fourth speed to the third speed is executed. The driver knows that the downshift has been performed, and thus knows that the control was performed according to the shift request. At this time, it is possible to know from the notification that the shift mode change condition has been switched.

  For this reason, conventionally, when the upper limit shift stage is reduced by one step by turning on the down shift request switch once, the driver notices that the downshift is not performed, and operates the lever operation again. It is no longer necessary to repeat the lever operation such as shifting to the downshift mode after returning to the position, and it is possible to accurately know that there is an abnormality in the lever operation system and improve the safe driving of the vehicle. .

  In the above, the embodiment of the present invention has been described for the case where it is applied to the configuration of the wheel drive system and the control system of the vehicle equipped with the automatic transmission shown in FIG. In the automatic transmission shown in the figure, a continuously variable transmission is used. However, a stepped transmission may be used instead of the continuously variable transmission. Even when a stepped transmission is used for an automatic transmission, the present invention is applied in the same manner as when a continuously variable transmission is used for an automatic transmission.

It is a flowchart explaining the determination operation | movement which concerns on the OFF (disconnection) failure of the transmission mode switch in the control apparatus of the automatic transmission of this embodiment. It is a flowchart explaining the determination operation | movement which concerns on ON (short circuit) failure of the transmission mode switch in the control apparatus of the automatic transmission of this embodiment. It is a flowchart explaining the change operation | movement which concerns on the automatic and manual transmission mode in the control apparatus of the automatic transmission of this embodiment. It is a figure explaining the example of composition of the wheel drive system and control system of vehicles carrying an automatic transmission with a general block. It is a figure explaining the operation positional relationship of the shift lever with which the vehicle carrying an automatic transmission is equipped, and arrangement | positioning of a shift lever switch. It is a figure explaining the change operation | movement of the automatic and manual transmission mode in the vehicle carrying the conventional automatic transmission.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 2 Automatic transmission 3 Differential gear 4, 5 Electronic controller 6 Engine speed detector 7 Acceleration / deceleration operation device 8 Vehicle speed detector 9 Output speed detector 10 Shift device 11 Range selection device

Claims (12)

Controls the shift mode of an automatic transmission provided in a vehicle having a shift operating device having at least a drive switch, an up / down shift request switch, and a manual switch as switches that are turned on / off according to the position of the shift lever. A shift mode control device for
The shift operation device is configured such that when the shift lever is operated to a position where the manual switch is turned on, both the manual switch and the drive switch are turned on,
Means for controlling the shift mode to change the shift mode to the manual shift mode when a mode change condition for changing from the automatic shift mode to the manual shift mode is established, that is, when the manual switch changes from off to on;
A failure detection means for detecting a failure of the manual switch,
The means for controlling the shift mode is such that, when a failure of the manual switch is detected by the failure detection means, a mode change condition for changing from the automatic shift mode to the manual shift mode, the drive switch is on, And the shift mode control device for an automatic transmission is switched to a condition that the up / down shift request switch is changed from OFF to ON . The means for controlling the shift mode changes the shift mode from the manual shift mode to the automatic shift mode when a mode change condition for changing from the manual shift mode to the automatic shift mode is established, such as when the manual switch changes from on to off. The shift mode control device for an automatic transmission according to claim 1, wherein: The means for controlling the shift mode is such that, when a failure of the manual switch is detected by the failure detection means, a mode change condition for changing from the manual shift mode to the automatic shift mode, the drive switch is on, 3. The automatic transmission according to claim 2, wherein switching is performed under a condition that at least one of a parking switch, a reverse switch, and a neutral switch provided in the speed change operation device is on. Shift mode control device . The means for controlling the shift mode, when a failure of the manual switch is detected by the failure detecting means, a mode change condition for changing from the manual shift mode to the automatic shift mode, after detecting the stop state, 3. The condition is switched to a condition in which the drive switch is on and at least one of a parking switch, a reverse switch, and a neutral switch provided in the shift operation device is on. A shift mode control device for an automatic transmission as described . The means for controlling the shift mode is such that, when a failure of the manual switch is detected by the failure detection means, a mode change condition for changing from the manual shift mode to the automatic shift mode, the drive switch is on, 3. The shift mode control device for an automatic transmission according to claim 2, wherein the condition is switched to a condition when a stop state is detected . The means for controlling the shift mode is characterized in that when a drive switch is turned on, a manual switch is turned off, and an up / down shift request switch is turned on, a disconnection failure of the manual switch is determined. Item 6. A transmission mode control device for an automatic transmission according to any one of Items 1 to 5 . It means for controlling the speed change mode, the parking switch, the reverse switch, the neutral switch, detect at least one of on the drive switch, and, when it is detected on the manual switch, the manual The shift mode control device for an automatic transmission according to any one of claims 3, 4, and 6, wherein a short circuit failure of the switch is determined. The shift mode control device for an automatic transmission according to claim 6 or 7, wherein the means for controlling the shift mode instructs the notification of the failure when the failure of the manual switch is determined. The means for controlling the shift mode is that when the disconnection failure of the manual switch is determined, the drive switch is turned on, and when the manual switch detects that the manual switch has changed from off to on, The shift mode control device for an automatic transmission according to claim 6 or 8, wherein it is determined that the vehicle has returned to a normal state. Means for controlling the speed change mode, when determining the short-circuit failure of the manual switch is turned on the drive switch, and, when it is detected that the manual switch is changed from on to off, the manual switch The shift mode control device for an automatic transmission according to claim 7 or 8, wherein it is determined that the vehicle has returned to a normal state. The shift mode of the automatic transmission according to claim 9 or 10, wherein when the manual switch can determine that the manual switch has returned to a normal state, the means for controlling the shift mode instructs a notification of normal return. Control device. It means for controlling the speed change mode, when switching the mode change condition from the manual mode change condition to shift mode or said manual shift mode from the automatic shift mode to the automatic shift mode, and instructs the notification of the switching The shift mode control device for an automatic transmission according to any one of claims 1 to 11, wherein

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