JP5870535B2 - Automatic transmission control device - Google Patents

Description

  The present invention relates to an automatic shift control device that shifts a transmission connected to an engine mounted on a vehicle.

  A safety system that limits the engine output (engine torque) by detecting the slip amount and vehicle attitude to prevent vehicle slip and side slip (for example, ASR (Anti-Slip Regulator)) and ESC (Electronic Stability Control) )) Is installed in a vehicle, the safety system is more effective by not automatically shifting the transmission when those safety systems are operating.

  Specifically, if the safety system detects that the engine output is restricted, the automatic transmission shift is prohibited, and then the safety system detects that the engine output restriction is released. The automatic shift prohibition of the transmission is canceled and the automatic shift of the transmission is permitted.

  Patent Document 1 discloses an oil temperature detecting means for detecting an oil temperature of oil supplied to and discharged from an automatic transmission, and an engine output when the oil temperature becomes higher than a first predetermined oil temperature. Engine output restriction means for restricting, engine output restriction release means for releasing the engine output restriction when the oil temperature is lower than a second predetermined oil temperature lower than a first predetermined oil temperature; And an engine output for stopping the engine output restriction when an acceleration request is made to the vehicle while the engine output is restricted. A control device for an automatic transmission comprising a restriction stopping means is described.

JP 2008-215237 A

  When the engine output restriction is no longer necessary, the safety system described above may release the engine output restriction little by little without gradually releasing the engine output restriction (gradual change control). For example, the safety system does not suddenly increase the engine output limit value from “50% → 100%”, but increases the engine output limit value from “50% → 55% → 60% → ... → 85% → 100%”. The engine output restriction is released after approaching 100% step by step.

  On the other hand, since the automatic transmission control device side prohibits automatic gear shifting until the safety system completely stops the engine output limitation, the engine output limiting means gradually releases the engine output limitation. During this period, the transmission permission permission is not determined. For this reason, the state where the transmission cannot be automatically shifted continues, and the driver may feel troublesome because the engine cannot be shifted up even though the engine speed is increasing.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an automatic transmission control device capable of appropriately shifting the transmission by quickly canceling the gear shifting prohibition of the transmission and allowing the gear shifting of the transmission immediately after transition to the gradual change control by the engine output limiting means. Is to provide.

  In order to achieve the above-mentioned object, the present invention provides an automatic transmission control device for shifting a transmission connected to an engine, an engine output limiting means for limiting engine output in accordance with a traveling state of the vehicle, and the engine When it is determined that the engine output is limited by the output limiting means, the shift prohibiting means for prohibiting the shift of the transmission and the gradual change control in which the engine output limiting means gradually releases the limit of the engine output. A shift prohibition canceling unit that cancels the shift prohibition of the transmission by the shift prohibiting unit and permits the shift of the transmission even when the engine output is being limited by the engine output limiting unit. is there.

  The engine output limiting means limits the engine output by multiplying the engine output obtained according to the driving state of the vehicle by an engine output limit value, and the shift prohibition canceling means When the engine output limit value by the limiting means continues in the increasing direction for a predetermined time and the engine output limit value by the engine output limiting means is greater than or equal to a predetermined value, the engine output limit means controls the gradual change control. It may be determined that the operation is being performed.

  The predetermined value of the engine output limit value may be set so as to vary according to the load amount of the vehicle.

  The shift prohibition canceling unit is configured to transmit the transmission by the shift prohibiting unit when a condition that the engine rotation is a predetermined value or more is satisfied in addition to the condition that the engine output limiting unit performs the gradual change control. The shift prohibition may be canceled and the shift of the transmission may be permitted.

  The predetermined value of the engine rotation may be set so as to vary according to the loading amount of the vehicle.

  According to the present invention, there is provided an automatic shift control device capable of appropriately shifting a transmission by quickly canceling the shift prohibition of the transmission and permitting the shift of the transmission immediately after transition to the gradual change control by the engine output limiting means. There is an excellent effect of being able to.

It is the schematic of the automatic transmission control apparatus which concerns on one Embodiment of this invention. It is a figure which shows the control circuit of a shift prohibition start and a shift prohibition cancellation | release. It is a figure which shows the time change of an engine output limit value. It is a figure which shows the modification of the control circuit of a shift prohibition start and a shift prohibition cancellation | release.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, a fluid coupling (fluid coupling, torque converter) 2 and a transmission clutch (wet multi-plate clutch) 3 are provided between an engine (diesel engine in this embodiment) E and a transmission T / M. And are inserted in series. The fluid coupling 2 is disposed on the engine E side, and the transmission clutch 3 is disposed on the transmission T / M side.

  The fluid coupling 2 generates creep when the vehicle starts, and the pump unit 4 that rotates integrally with the casing 18 connected to the output shaft (crankshaft) 1 a of the engine E, and the pump unit 4 within the casing 18. And a stator portion 6 interposed between the turbine portion 5 and the pump portion 4 and mainly connected to the input shaft 3 a of the transmission clutch 3. The pump unit 4 and the turbine unit 5 are fastened and separated by the lockup device 20. The lockup device 20 includes a lockup clutch 7 interposed between the pump unit 4 and the turbine unit 5, and a hydraulic circuit 19 that operates the lockup clutch 7.

  The transmission clutch 3 has an input shaft 3a connected to the turbine portion 5 of the fluid coupling 2, and an output side connected to the input shaft 8 of the transmission T / M, between the fluid coupling 2 and the transmission T / M. Is connected and disconnected. When shifting the transmission T / M, the transmission clutch 3 is disconnected before gear disengagement and is contacted after gear-in. The transmission clutch 3 is normally urged in the disconnecting direction by a spring (not shown), and is brought into contact with the pressure oil from the hydraulic circuit 19. Specifically, the shift clutch 3 includes a clutch casing (not shown) filled with oil, and a plurality of clutch plates (or clutch disks) are alternately spline-engaged on the input side and the output side. The transmission clutch 3 is connected and disconnected by pressing or releasing the plates. The shift clutch 3 is not limited to one that is operated by hydraulic pressure, but may be one that is operated by a fluid other than oil (for example, water).

  The transmission T / M is disposed in parallel with the input shaft 8 connected to the output side of the transmission clutch 3, the output shaft 9 disposed coaxially with the input shaft 8, and the input shaft 8 and the output shaft 9. The countershaft 10 has a so-called manual type. An input main gear 11 is provided on the input shaft 8. The output shaft 9 is supported by a first speed main gear M1, a second speed main gear M2, a third speed main gear M3, a fourth speed main gear M4, and a reverse main gear MR, respectively. A main gear M6 is fixed. The countershaft 10 includes an input subgear 12 that meshes with the input main gear 11, a first speed subgear C1 that meshes with the first speed main gear M1, a second speed subgear C2 that meshes with the second speed main gear M2, and 3 A three-speed sub gear C3 meshing with the speed main gear M3, a four-speed sub gear C4 meshing with the fourth speed main gear M4, and a reverse sub gear CR meshing with the reverse main gear MR via the idle gear IR are fixed. A 6-speed sub gear C6 that meshes with the 6-speed main gear M6 is pivotally supported.

  According to this transmission T / M, when the sleeve S / R1 spline-engaged with the hub H / R1 fixed to the output shaft 9 is spline-engaged with the dog DR of the reverse main gear MR, the output shaft 9 rotates reversely. When the above-described sleeve S / R1 is spline-engaged with the dog D1 of the first-speed main gear M1, the output shaft 9 rotates at a speed equivalent to the first speed. When the sleeve S / 23 that is spline-engaged with the hub H / 23 fixed to the output shaft 9 is spline-engaged with the dog D2 of the second-speed main gear M2, the output shaft 9 rotates corresponding to the second speed, and the above-described sleeve S When / 23 is spline-engaged with the dog D3 of the third speed main gear M3, the output shaft 9 rotates at the third speed. When the sleeve S / 45 spline-engaged with the hub H / 45 fixed to the output shaft 9 is spline-engaged with the dog D4 of the 4-speed main gear M4, the output shaft 9 rotates at a speed equivalent to the 4-speed, and the sleeve S described above When / 45 is spline-engaged with the dog D5 of the input main gear 11, the output shaft 9 is rotated at the fifth speed (direct connection). When the sleeve S6 spline-engaged with the hub H6 fixed to the countershaft 10 is spline-engaged with the dog D6 of the sixth-speed sub-gear C6, the output shaft 9 rotates at the sixth speed.

  Each of the sleeves S described above is manually operated via a shift fork and a shift rod (not shown) when the driver operates the shift lever 21 in the driver's cab (manual shift mode), or a gear shift actuator (not shown) is installed in the engine E. Is operated automatically by operating the above-mentioned shift fork and shift rod according to the driving state (depressed amount of the accelerator pedal 23, vehicle speed, etc.) (automatic shift mode). When the gear stage of the transmission T / M is switched in the manual transmission mode or the automatic transmission mode, the transmission clutch 3 is disconnected before the current gear stage is disengaged, and after the gear-in to another gear stage is performed. Is touched.

  In the vicinity of the input main gear 11 of the transmission T / M or the input sub-gear 12 meshing with the input main gear 11, the rotational speed of the input shaft 8 (transmission input shaft rotational speed) of the transmission T / M is detected. A rotation sensor 27 is provided, and a detection value of the rotation sensor 27 is input to the control means (ECU) 22. The ECU 22 locks the lockup device 20 (hydraulic circuit 19) of the fluid coupling 2 when the detection value (transmission input shaft rotation speed) of the rotation sensor 27 is equal to or lower than a set value (for example, 800 rpm). When the up-clutch 7 is disengaged and becomes a set value (for example, 1000 rpm) or more, the lock-up clutch 20 is engaged by operating the lock-up device 20 (hydraulic circuit 19) to the contact side.

  Further, the depression amount of the accelerator pedal 23 is detected by the accelerator sensor 24, and the depression amount is input to the ECU 22. Further, the depression amount of the brake pedal 25 is detected by the brake sensor 26 and the depression amount is input to the ECU 22.

  Here, the automatic shift control device according to the present embodiment has an engine output limiting means (safety system) 30 that limits engine output (engine torque) according to the traveling state of the vehicle, and a predetermined shift prohibition start condition is established. When the transmission is prohibited, the transmission prohibiting means 31 for prohibiting the transmission of the transmission T / M and the transmission T by the transmission prohibiting means 31 when a predetermined shift prohibition release condition is satisfied while the transmission of the transmission T / M is prohibited. Shift prohibition release means 32 that cancels the shift prohibition of / M and permits the shift of the transmission T / M. In the present embodiment, the engine output limiting means 30, the shift prohibiting means 31, and the shift prohibition releasing means 32 are attached to the ECU 22. The engine output limiting means 30, the shift prohibiting means 31, and the shift prohibition releasing means 32 may be provided in an ECU other than the ECU 22, respectively.

  The engine output limiting means 30 (ECU 22) limits the engine output in accordance with the running state of the vehicle (slip amount, vehicle posture, etc.) in order to prevent the vehicle from slipping or skidding. Specifically, the engine output limiting means 30 is a vehicle operating state (for example, transmission input shaft rotation speed (engine rotation) detected by the rotation sensor 27) or depression of the accelerator pedal 23 detected by the accelerator sensor 24. The target is obtained by multiplying the engine output obtained according to the amount) by the engine output limit value (0% to 100%) obtained according to the running state of the vehicle (slip amount, vehicle attitude, etc.). The engine output is calculated.

  As shown in FIG. 2, the shift prohibiting means 31 (ECU 22) operates when the engine output limit value from the engine output limiting means 30 changes from 100% to other than 100%, or when the engine output from the engine output limiting means 30 When the limit value is equal to or less than the carry value (predetermined value), a shift prohibition start condition OR unit 33 that prohibits the shift of the transmission T / M is provided. Therefore, the shift prohibiting unit 31 determines that the engine output limit value from the engine output limiting unit 30 is satisfied when the condition that the engine output limit value from the engine output limiting unit 30 has changed from 100% to other than 100% is satisfied. When the condition that the value is equal to or less than the carry value (for example, 40%) is satisfied, the transmission of the transmission T / M is prohibited. This is because when the engine output limit value changes from 100% to other than 100%, it can be considered that the engine output limit by the engine output limit means 30 has started. When the engine output limit value becomes equal to or less than the carry value (for example, 40%), the shift prohibition start condition is set when the engine output limit is returned to the engine output limit from so-called gradual change control for some reason. This is because it is necessary to prohibit the shifting of the machine T / M.

  As shown in FIG. 2, the shift prohibition canceling means 32 (ECU 22) receives an output signal from a shift prohibition canceling condition AND unit 35 described later, or an engine output limit value from the engine output limiting means 30. When it is 100% or when reception of a signal from the engine output limiting means 30 is not possible for a predetermined time (a fixed time), the shift prohibition of the transmission T / M by the shift prohibiting means 31 is canceled and the transmission T / M A shift prohibition release condition OR unit 34 that permits a shift is provided.

  Two signals are input to the shift prohibition release condition AND unit 35 as essential conditions for canceling the shift prohibition of the transmission T / M and permitting the shift of the transmission T / M.

  The first signal is a signal indicating that the state in which the engine output limit value from the engine output limiter 30 is increasing is continued for a predetermined time (fixed time). When the state in which the engine output limit value from the engine output limiter 30 is in the increasing direction continues for a predetermined time (for example, 0.2 s), the engine output limiter 30 does not suddenly release the engine output limit and the engine This is because it can be considered that the gradual change control for gradually releasing the output restriction is performed. The first signal is obtained by applying the signal from the engine output limiting means 30 to a comparator (not shown).

  The second signal is a signal indicating that the engine output limit value from the engine output limit means 30 is equal to or greater than the carry value (predetermined value). When the engine output limit value from the engine output limiting means 30 is equal to or greater than the carry value (for example, 50%), the engine output is not limited to prevent slipping or side slipping, but the control is shifted to gradual change control. It is because it can be regarded as having done. The second signal is obtained by applying the signal from the engine output limiting means 30 to a comparator (not shown).

  Therefore, the shift prohibition canceling means 32 continues the state in which the engine output limit value from the engine output limiting means 30 is in the increasing direction for a predetermined time (for example, 0.2 s) and limits the engine output from the engine output limiting means 30. When the condition that the value is greater than or equal to the carry value (for example, 50%) is satisfied, or when the condition that the engine output limit value from the engine output limiting means 30 is 100%, or the engine output limit When the condition that the signal cannot be received from the means 30 for a predetermined time (for example, 1 s) is satisfied, the shift prohibition of the transmission T / M by the shift prohibiting means 31 is canceled and the shift of the transmission T / M is permitted. This is because when the engine output limit value is 100%, the engine output limit by the engine output limit means 30 can be regarded as stopped. When the signal cannot be received from the engine output limiting unit 30 for a predetermined time (for example, 1 s), the shift prohibition canceling condition is set when the signal cannot be received from the engine output limiting unit 30 due to some problem. This is because it is necessary to cancel the shift prohibition of the transmission T / M and permit the transmission of the transmission T / M.

  Furthermore, in the automatic transmission control device according to the present embodiment, since the ease of slipping and the like varies depending on the loading amount (or weight) of the vehicle, the carry value (predetermined value of the engine output limit value) is set to the loading amount of the vehicle. It was set to be variable depending on Specifically, the carry value (predetermined value of the engine output limit value) is set so as to decrease as the vehicle load increases. This is because slipping or the like becomes easier as the loading amount of the vehicle increases, so that the engine output limit value by the engine output limiting means 30 decreases, and it is considered that the engine output limit value is shifted to a gradually changing control in a region where the engine output limit value is smaller. . The loading amount of the vehicle is calculated based on, for example, an acceleration signal from an acceleration sensor conventionally provided in the vehicle.

  Next, the effect of this embodiment is demonstrated.

  FIG. 3 shows data when the engine output restriction means 30 restricts the engine output in order to prevent slipping when the vehicle starts (time change of the engine output restriction value).

  In the area A shown in FIG. 3, the engine output restriction means 30 intentionally restricts the engine output, but in the next area B, the engine output restriction means 30 gradually changes until the engine output restriction is released. Control may be performed. In the region B shown in FIG. 3, it is safe to shift the transmission T / M, but in the conventional automatic transmission control device, the prohibition of transmission of the transmission T / M continues and the driver may feel troublesome. is there.

  Therefore, in the automatic transmission control apparatus according to the present embodiment, whether or not the engine output restriction by the engine output restriction means 30 is in the region B shown in FIG. 3 (that is, the engine output restriction by the engine output restriction means 30 is limited). 3), and when it is determined that it is the region B shown in FIG. 3 (that is, the engine output restriction by the engine output restriction means 30 has shifted to gradual change control). The shift prohibition of the transmission T / M is canceled and the shift of the transmission T / M is permitted.

  Specifically, the shift prohibition release unit 32 continues the state where the engine output limit value from the engine output limit unit 30 is increasing for a predetermined time, and the engine output limit value from the engine output limit unit 30 is the carry value. When the above condition is satisfied, even if the engine output is being limited by the engine output limiting means 30 (the engine output limit value is other than 100%), the transmission T / M of the transmission T / M is controlled by the shift prohibiting means 31. The shift prohibition is canceled and the shift of the transmission T / M is permitted.

  Therefore, according to the automatic transmission control apparatus according to the present embodiment, the shift prohibition of the transmission T / M is immediately released after the gradual change control until the restriction on the engine output is released, and the transmission of the transmission T / M is changed. Therefore, the transmission T / M can be appropriately shifted.

  In the automatic transmission control apparatus according to the present embodiment, the carry value (predetermined value of the engine output limit value) is set so as to be variable depending on the load amount of the vehicle. The shift timing can be accurately determined, and the transmission T / M can be shifted more appropriately.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various other embodiments can be adopted.

  For example, the shift prohibition canceling means 32 (ECU 22) keeps the engine output limit value from the engine output limiting means 30 in the increasing direction for a predetermined time, and the engine output limit value from the engine output limiting means 30 is the carry value. When the condition that the engine rotation is equal to or greater than the carry value (predetermined value) is satisfied, the shift prohibition of the transmission T / M by the shift prohibiting means 31 is canceled and the transmission T / M It may be one that permits M shifting.

  In such a case, as shown in FIG. 4, the shift prohibition release unit 32 includes a shift prohibition release condition AND unit 36. In addition to the first and second signals described above, the shift prohibition canceling condition AND unit 36 includes the first and second signals described above as an essential condition for canceling the shift prohibition of the transmission T / M and permitting the shift of the transmission T / M. 3 signal is input. The third signal is a signal indicating that the engine speed (engine speed) is equal to or greater than a carry value (for example, 2500 rpm). This is because the state in which the engine rotation is equal to or higher than the carry value (eg, 2500 rpm) can be considered to be upshifted. The third signal is obtained by applying the signal from the rotation sensor 27 to a comparator (not shown). Further, the carry values (predetermined value of engine output limit value, predetermined value of engine rotation) may be set so as to be variable depending on the loading amount of the vehicle. Specifically, it is conceivable that the carry values (the predetermined value of the engine output limit value and the predetermined value of the engine rotation) are set so as to decrease as the loading amount of the vehicle increases.

22 ECU
30 Engine output limiting means 31 Shift prohibiting means 32 Shift prohibiting canceling means E Engine T / M Transmission

Claims (4)

In an automatic transmission control device for shifting a transmission connected to an engine,
Engine output limiting means for limiting engine output in accordance with the running state of the vehicle;
While the engine output is limited by the engine output limiting unit, a shift prohibiting unit that prohibits shifting of the transmission;
When it is determined that the engine output limiting means is performing gradual change control for gradually releasing the engine output restriction, the shift by the shift prohibiting means is performed even when the engine output is being restricted by the engine output restriction means. Shift prohibition release means for canceling the shift prohibition of the machine and permitting the shift of the transmission;
Equipped with a,
The engine output limiting means limits the engine output by multiplying the engine output obtained according to the driving state of the vehicle by an engine output limit value, and the shift prohibition canceling means When the engine output limit value by the limiting means continues in the increasing direction for a predetermined time and the engine output limit value by the engine output limiting means is greater than or equal to a predetermined value, the engine output limit means controls the gradual change control. An automatic transmission control device characterized in that it is determined that the vehicle is performing . Predetermined value of the engine output limit, the automatic transmission control device according to claim 1 that is configured to variably depending on the load capacity of the vehicle. The shift prohibition canceling unit is configured to transmit the transmission by the shift prohibiting unit when a condition that the engine rotation is a predetermined value or more is satisfied in addition to the condition that the engine output limiting unit performs the gradual change control. automatic transmission control device according to claim 1 or 2 by releasing the shift prohibiting permits shifting of the transmission. The automatic transmission control device according to claim 3 , wherein the predetermined value of engine rotation is set so as to vary according to the loading amount of the vehicle.