JP4670265B2 - Control device for vehicle with idle stop - Google Patents

Description

  The present invention relates to a control device for a vehicle with an idle stop, and belongs to the technical field of idle stop control.

  In order to improve fuel consumption, reduce emissions of environmental pollutants or carbon dioxide, and suppress noise, the brake pedal will continue for a predetermined time when the vehicle is stopped (for example, when the vehicle speed is zero). The engine is automatically stopped, and then the engine is automatically started when a predetermined engine start condition (for example, release of the brake pedal is released) is satisfied. Vehicles with so-called idle stops are generally known.

  By the way, in a vehicle equipped with an automatic transmission, a creep force is generally generated when the engine is operating. However, when the engine is automatically stopped by an idle stop as described above, the creep force is not generated. In a state where the creep force is not generated, for example, if the brake pressure decreases due to a leak of brake fluid in a valve constituting the brake fluid piping, there is a possibility that the vehicle may reverse on an uphill. is there. Therefore, when the brake pressure falls below a predetermined pressure that may cause the vehicle to reverse, it is conceivable to restart the engine and generate a creep force.

  On the other hand, Patent Document 1 is not intended for a vehicle with an idle stop as described above, but in order to prevent the vehicle from moving backward while stopping on a hill or the like, a shift of the automatic transmission is performed while the vehicle is stopped. There is disclosed a gear stage that can prevent the vehicle from moving backward. Specifically, when the vehicle is stopped, the gear position (second speed) is set such that rotation of the output shaft of the transmission in the vehicle reverse direction is blocked by the one-way clutch. If the technology described in Patent Document 1 is applied to an idle stop vehicle, the vehicle can be prevented from retreating without restarting the engine even when the brake fluid pressure is reduced while the engine is automatically stopped (stopped). Can do.

  On the other hand, in Patent Document 2, in a vehicle equipped with an automatic transmission, as a shift mode, an automatic shift mode (first mode) that automatically shifts according to the traveling state of the vehicle, and a shift operation by a passenger And a manual shift mode (second mode) for shifting gears, and any one of these modes can be executed according to the occupant's selection.

JP-A-5-263923 Japanese Patent Laid-Open No. 10-89460

  By the way, in a vehicle equipped with an automatic transmission, information such as the D range, the S range, and the R range is displayed on the instrument panel or the like as information about the automatic transmission. 3rd speed, 4th speed, etc.) are rarely displayed. For example, when the manual shift mode is provided as described in Patent Document 2 above, or drivability is not provided even if the manual shift mode is not provided. When the improvement is intended, the gear position may be displayed. In this case, when the technique described in Patent Document 1 is applied, the following problems occur.

  That is, when the technique described in Patent Document 1 is applied to such a vehicle with an idle stop, the gear position of the automatic transmission is automatically controlled from the first speed to the second speed at the time of idling stop. Although the display will change from the first speed to the second speed, the occupant often has a preconception that the gear stage is controlled to the first speed when the vehicle is stopped, so this switching will be uncomfortable. . In particular, in a vehicle that is also provided with the manual shift mode described in Patent Document 2, an unintended shift stage is selected even though the occupant selects the manual shift mode to intentionally control the shift stage. Switching occurs, and the passenger feels uncomfortable. However, if the shift control from the 1st speed to the 2nd speed is not executed at the time of idling stop in order to eliminate this sense of incongruity, as described above, the brake pressure becomes lower than the pressure that may cause the vehicle to reverse on an uphill or the like. When it falls, there exists a possibility that a vehicle may reverse | retreat.

  Therefore, the present invention provides a control device capable of preventing the vehicle from moving backward without giving a sense of discomfort to the occupant at the time of idling stop in a vehicle with an idling stop provided with a shift stage display means of an automatic transmission. The task is to do.

  In order to solve the above-mentioned problems, the present invention is configured as follows.

  First, the invention according to claim 1 of the present application (hereinafter referred to as the first invention) includes an automatic transmission having a predetermined shift stage capable of preventing the vehicle from moving backward at a shift stage that is not the lowest speed stage on the low speed stage side. A driving condition detecting means for detecting a driving condition of the vehicle including a depression state of the brake, and a first predetermined condition that the driving condition of the vehicle detected by the driving condition detection means includes that the brake is depressed. An idle stop means for automatically stopping the engine when the engine is satisfied, and for automatically restarting the engine when a second predetermined condition including release of brake depression during the automatic engine stop is satisfied; While the engine is automatically stopped by the idle stop means, there are a shift means for controlling the shift stage of the automatic transmission to the predetermined shift stage, and a display means for displaying the current shift stage of the automatic transmission. The control device for the obtained vehicle with idle stop, wherein the display means displays the lowest speed when the speed change means is changed from the lowest speed to a predetermined speed by the speed change means during the automatic stop of the engine. It is characterized by holding.

  In the invention according to claim 2 of the present application (hereinafter referred to as second invention), in the first invention, the speed change means automatically changes the speed according to the running state of the vehicle detected by the running state detecting means. In the case where either one of the first mode and the second mode for shifting according to the occupant's shift operation can be executed according to the driver's selection, the display means During execution, the current gear position of the automatic transmission is displayed, and when the engine is automatically stopped while the second mode is being executed and the engine is automatically stopped, the gear position is changed to the lowest gear position by the above-mentioned shifting means. When the speed is changed from a predetermined speed to a predetermined speed, the minimum speed display is maintained.

  Next, the effect of the present invention will be described.

  First, according to the first aspect of the present invention, the shift speed is automatically changed from the lowest speed to the predetermined speed by the speed change means during the automatic stop of the engine. Even when the pressure drops below a certain pressure, it is possible to prevent the vehicle from moving backward, and when the shift stage is changed, the shift stage display is held at the lowest speed stage. It is not noticed that the gear position is changed by, and the passenger does not feel uncomfortable.

  Further, according to the second aspect of the invention, in the case of having the second mode for intentionally controlling the shift speed, it is possible to prevent the passenger from feeling uncomfortable due to an unintended shift. That is, since the second mode is for intentionally controlling the shift speed as described above, if an unintended shift occurs when the second mode is selected, the first mode However, in the second aspect of the invention, when the shift stage is automatically changed by the shift means, the shift stage display indicates the lowest speed stage. Therefore, the occupant does not notice the change of the gear position by the speed change means, and the occupant does not feel uncomfortable. Further, as in the first aspect of the invention, when the engine is automatically stopped, the shift stage is automatically changed from the lowest speed stage to the predetermined speed stage by the transmission means, so that the vehicle can be prevented from moving backward.

  Embodiments of the present invention will be described below.

First, a vehicle with an idle stop according to first to third embodiments described below and a reference example of the present invention described later will be described.

As shown in FIG. 1, in the vehicle 1 according to the first to third embodiments and the reference example , an engine 2 is disposed in a lateral direction in an engine room at the front of the vehicle body, and the output of the engine 2 is an automatic transmission. This is an FF (front engine / front drive) type vehicle configured to be transmitted to the left and right front wheels 6a and 6b via the machine 3, the differential 4 and the axles 5a and 5b. In addition, the vehicle 1 stops the engine 2 when a predetermined condition described later is satisfied, such as when the vehicle is stopped, in order to improve fuel efficiency, reduce emissions of environmental pollutants or carbon dioxide, and suppress noise. This is a vehicle with an idle stop having a so-called idle stop function. The engine room is operated by receiving power supply from the starting battery 7 of the engine 2 at the time of idle stop, and includes an electric motor 8a, a pump 8b, and the like. An electric oil pump 8 is arranged. An accelerator pedal 9, a brake pedal 10 and the like are disposed in the vehicle interior.

  Next, the automatic transmission 3 will be described in detail with reference to FIG.

  As shown in FIG. 2, the automatic transmission 3 includes, as main components, a torque converter 20 and first and second planetary gear mechanisms 30 arranged adjacent to each other as a transmission gear mechanism driven by the output of the converter 20. , 40 and a plurality of friction elements 51 to 55 such as a clutch and a brake for switching the power transmission path formed by these planetary gear mechanisms 30 and 40 and a one-way clutch 56, thereby allowing the first to fourth speeds in the D range, The first to third speeds in the S range, the first to second speeds in the L range, and the reverse speed in the R range are obtained.

  The torque converter 20 is fixed to a case 21 connected to an output shaft 2 a of the engine 2, and disposed opposite to the pump 22, and is driven by the pump 22 via hydraulic oil. A turbine 23, a stator 25 interposed between the pump 22 and the turbine 23 and supported by the transmission case 11 via a one-way clutch 24 to increase torque, the case 21 and the turbine 23 And a lock-up clutch 26 that directly connects the output shaft 2 a of the engine 2 and the turbine 23 via the case 21. The rotation of the turbine 23 is output to the planetary gear mechanisms 30 and 40 via the turbine shaft 27.

  Here, an engine-driven oil pump 12 that is driven by the engine 2 via a case 21 of the torque converter 20 is disposed on the opposite side of the torque converter 20.

  On the other hand, each of the first and second planetary gear mechanisms 30, 40 has sun gears 31, 41, a plurality of pinions 32, 32, 42, 42 that mesh with the sun gears 31, 41, and these pinions 32,. The pinion carriers 33 and 43 that support the pins 32, 42, and 42, and ring gears 34 and 44 that mesh with the pinions 32, 32, 42, and 42, respectively.

  A forward clutch 51 is provided between the turbine shaft 27 and the sun gear 31 of the first planetary gear mechanism 30, and a reverse clutch 52 is provided between the turbine shaft 27 and the sun gear 41 of the second planetary gear mechanism 40. A 3-4 clutch 53 is interposed between the turbine shaft 27 and the pinion carrier 43 of the second planetary gear mechanism 40, and a 2-4 brake 54 for fixing the sun gear 41 of the second planetary gear mechanism 40 is provided. Is provided.

  Further, the ring gear 34 of the first planetary gear mechanism 30 and the pinion carrier 43 of the second planetary gear mechanism 40 are connected, and a low reverse brake 55 and a one-way clutch 56 are connected in parallel between the ring gear 34 and the transmission case 11. The pinion carrier 33 of the first planetary gear mechanism 30 and the ring gear 44 of the second planetary gear mechanism 40 are connected to each other, and the output gear 13 is connected to them.

  The output gear 13 is meshed with a first intermediate gear 62 on an idle shaft 61 that constitutes the intermediate transmission mechanism 60, and the second intermediate gear 63 on the idle shaft 61 and the input of the differential device 4. The gear 71 is engaged with each other, and the rotation of the output gear 13 is input to the differential case 72 of the differential device 4, and the left and right axles 5 a and 5 b are driven via the differential device 4.

  Here, Table 1 summarizes the relationship between the hydraulic pressure supply state of the friction elements 51 to 55 such as the clutches and brakes, the operating state of the one-way clutch 56, and the gear position. Here, the circles in Table 1 mean that the hydraulic pressure is supplied to the friction elements 51 to 55, and the locked state is meant for the one-way clutch 56. Of the friction elements 51 to 55, the forward clutch 51, the 3-4 clutch 53, the low reverse brake 55, and the reverse clutch 52 have a single hydraulic chamber, and when the hydraulic pressure is supplied to the hydraulic chamber. The friction element is fastened. Further, the 2-4 brake 54, which is a band brake, has a fastening chamber 54a and a release chamber 54b as hydraulic chambers to which operating hydraulic pressure is supplied. When the operating hydraulic pressure is supplied only to the fastening chamber 54a, the 2-4 brake 54 is provided. -4 When the brake 54 is engaged and the hydraulic pressure is supplied only to the release chamber 54b, the hydraulic pressure is not supplied to both the chambers 54a and 54b, and the hydraulic pressure is supplied to both the chambers 54a and 54b. The 2-4 brake 54 is released when the vehicle is on. Further, the one-way clutch 56 is in a locked state at the first speed and in a free state at the second to fourth speeds during forward movement (during positive driving). Therefore, at the time of reverse driving at the second speed to the fourth speed, the one-way clutch 56 is locked, and the rotation of the axles 5a and 5b in the vehicle reverse direction is locked.

Next, the automatic transmission 3 is an idle stop control of installed idling stop vehicles with 1, will be described in detail through the first to third embodiments and Reference Examples. In addition, about what was already demonstrated (the engine 2, automatic transmission 3, etc.), the same code | symbol is used through 1st-3rd embodiment and a reference example .

First, the first embodiment will be described. As shown in FIG. 3, the vehicle 1 with an idle stop is provided with a control circuit 100 that performs idle stop control. A signal from the vehicle speed sensor 101 that detects the speed of the vehicle, a signal from the accelerator position sensor 102 that detects the amount of depression of the accelerator pedal 9 (accelerator position), and a brake that is turned on when the brake pedal 10 is depressed. A signal from the switch 103 is input. The control circuit 100 and the like describe a part of the control device for the engine and the transmission, and signals from the vehicle speed sensor 101 and signals from the accelerator opening sensor 102 are obtained by other parts of the control device. normal shift control and engine control and the like based on the like are separately performed (second, identical in form and reference example of the third embodiment).

  Then, the control circuit 100 executes idle stop control based on signals from these switches and sensors, and the shift control actuators 111... 111 (shift solenoid valve, etc.) of the transmission 3 and a battery-driven type. A control signal is outputted to the electric oil pump 8, the fuel injection valves 121... 121 and the spark plugs 122... 122 of the engine 2, and a gear stage display signal of the automatic transmission 3 is outputted to the gear stage display means 130. Here, as described above, the battery-driven electric oil pump 8 replaces the engine-driven oil pump 12 which is in an operation stop state at the time of idling stop (while the engine is stopped). The hydraulic pressure is supplied to the friction elements 51... 55 of the transmission 3 and the hydraulic pressure is supplied. The gear stage display means 130 has a display on the instrument panel, and, for example, “1” for the first speed, “2” for the second speed, and “2” for the third speed based on the display signal from the control circuit 100. “3” and “4” are displayed for the fourth speed.

  Next, the control by the control circuit 100 will be described using the flowchart shown in FIG.

  First, after each detection value from the sensor or switch is input in step S1, it is determined in step S2 whether an idle stop is being performed. As a result, when the vehicle is not idling stop (NO), in step S3, the vehicle speed is zero (the vehicle speed is equal to or lower than the predetermined vehicle speed, including substantially zero) and the brake switch 103 is turned on, that is, the engine 2 It is determined whether or not the automatic stop condition is satisfied. As a result, if not satisfied (NO), the process returns as it is, and if satisfied (YES), the engine 2 is automatically stopped in step S4. That is, the fuel supply by the fuel injection valves 121... 121 and the spark ignition by the spark plugs 122. At this time, the gear position is set to the first speed as a result of shifting according to the normal shift map.

  Next, in step S5, the gear position is controlled from the first speed to the second speed. That is, the transmission control actuators 111... 111 are controlled to supply the hydraulic pressure to the hydraulic chamber of the forward clutch 51 and the engagement chamber 54a of the 2-4 brake 54, and the forward clutch 51 and the 2-4 brake 54 are engaged. Let At this time, as the engine 2 is automatically stopped, the engine-driven oil pump 12 is stopped and the generation of the working oil pressure is stopped. Therefore, the control circuit 100 operates the battery-driven electric oil pump 8. Let

  Next, in step S6, the first gear is displayed on the gear stage display means 130. In this case, the actual shift speed and the shift speed displayed on the gear speed display means 130 are different. This is because the shift speed display of the automatic transmission 3 is displayed when the engine 2 is automatically stopped. The purpose is to prevent the passenger from feeling uncomfortable with switching from the first speed to the second speed.

  On the other hand, when the idling stop is being performed in step S2 (YES), it is determined in step S7 whether the brake is turned off, that is, whether the brake switch 103 is turned off, and the vehicle speed is a predetermined vehicle speed. It is determined whether it is larger, that is, whether the restart condition of the engine 2 is satisfied. Here, when the vehicle speed becomes higher than the predetermined vehicle speed, for example, the brake pedal 10 is depressed, or the brake pedal 10 is depressed, but the brake fluid pressure decreases as described in the background art. This is the case when the vehicle 1 starts to move forward on a slope or the like. If not satisfied (NO) in step S7, the process directly returns. If satisfied (YES), the engine 2 is restarted in step S8. That is, the fuel supply by the fuel injection valves 121... 121 and the spark ignition by the spark plugs 122. Further, as the engine 2 is restarted, the engine-driven oil pump 12 is re-driven by the engine 2 and the generation of hydraulic pressure by the pump 12 is resumed. The operation of the pump 8 is stopped.

  Next, in step S9, it is determined whether or not the accelerator opening is larger than a predetermined opening. As a result, if the accelerator opening is larger than the predetermined opening (YES), that is, if the occupant wants to start suddenly, in step S10, the gear position is changed from 2nd to 1st so as to obtain a large acceleration force. To control. That is, the shift control actuators 111... 111 are controlled to supply the operating hydraulic pressure to the hydraulic chamber of the forward clutch 51 and to put the forward clutch 51 in the engaged state. At this time, as the engine 2 is restarted, the engine-driven oil pump 12 is activated and the generation of the hydraulic pressure is resumed. Therefore, the control circuit 100 stops the battery-driven electric oil pump 8. Let

  At this time, the first speed is displayed on the gear stage display means 130 in step S11. In this case, the actual shift speed and the shift speed displayed on the gear speed display means 130 coincide with each other.

  On the other hand, if the accelerator opening is equal to or smaller than the predetermined opening in step S9 (NO), that is, if the occupant wants to start slowly, the second speed is maintained in step S12. The second speed state is maintained until a 2-3 shift up shift based on the shift map occurs.

  At this time, the first gear is displayed on the gear stage display means 130 in step S13. In this case, the actual shift speed and the shift speed displayed on the gear speed display means 130 are different from each other. This is because the speed of the automatic transmission 3 is suddenly 1 when the engine 2 is restarted. The purpose is to prevent the occupant from feeling uncomfortable by switching from the second speed to the second speed.

  Next, the operation of the idle stop control according to the first embodiment will be described.

  Now, for example, it is assumed that the vehicle is traveling at the fourth speed in the D range. At that time, when the brake pedal 10 is depressed by the occupant, the vehicle speed gradually decreases and the gear position is controlled to the low speed stage side such as 4th speed → 3rd speed → 2nd speed → 1st speed according to the shift map. In addition, the brake switch 103 is turned on when the brake pedal 10 is depressed. When the vehicle speed becomes zero, counting of the ON duration of the brake switch 103 from when the vehicle speed becomes zero starts. When the duration time reaches a predetermined time, the automatic stop condition of the engine 2 is satisfied and the engine 2 is automatically stopped. At the same time, the gear position is controlled from the first speed to the second speed, but the first gear speed is displayed on the gear stage display means 130 and does not change.

  During the idle stop, when the brake pedal 10 is released by the occupant and the brake switch 103 is turned off, the restart condition of the engine 2 is satisfied and the engine 2 is restarted. Further, when the accelerator opening is larger than the predetermined opening, the speed is changed from the second speed to the first speed. At this time, the first gear is displayed on the gear stage display means 130.

  On the other hand, when the accelerator opening is equal to or smaller than the predetermined opening when the engine is restarted, the second speed is maintained, but the gear stage display means 130 displays the first speed.

  As described above, according to the first embodiment, the shift speed is automatically changed from the first speed (minimum speed) to the second speed (predetermined shift speed) while the engine 2 is automatically stopped. The vehicle 1 can be prevented from moving backward even when the brake pressure is lowered below a pressure that may cause the vehicle to reverse, such as on an uphill, and when the shift stage is changed, the shift stage Since the display is held at the first speed (minimum speed stage), the occupant does not notice the change of the shift stage, and the occupant does not feel uncomfortable.

  Further, as described above, when the engine 2 is automatically stopped, the operation oil pressure is supplied to the friction element by the battery-driven AT oil pressure control electric oil pump 8. As shown in Table 1 above, the second speed is a shift with the smallest number of hydraulic pressure supply destinations to the friction elements among the second speed, the third speed, and the fourth speed, which are gear stages that can prevent the vehicle 1 from moving backward. Therefore, the amount of operating hydraulic pressure supplied is less than when the gear is controlled to a gear that can prevent the vehicle from reversing other than the second gear. As a result, the discharge power from the battery 7 to the electric oil pump 8 is reduced. As a result, the duration of idle stop can be increased.

  Next, a second embodiment will be described. The second embodiment is directed to a vehicle with an idle stop having an automatic transmission mode that automatically changes gears according to the running state of the vehicle and a manual transmission mode that changes gears according to the occupant's shift operation. is there.

  That is, as shown in FIG. 5, the vehicle 1 with an idle stop according to the second embodiment is provided with a control circuit 200 that performs idle stop control, and the control circuit 200 is provided with the first embodiment. In addition to the signals from the vehicle speed sensor 201, the accelerator opening sensor 202, and the brake switch 203, the signal from the shift mode detecting means 204 for detecting the shift mode selected by the occupant via the shift lever, etc. Thus, a signal from the selection gear detection means 205 for detecting the selected gear stage is input via a shift lever or the like. Here, for example, a mode switch may be used as the shift mode detection unit 204, and an upshift switch and a downshift switch may be used as the selection gear detection unit 205.

The control circuit 200 executes idle stop control based on signals from these switches and sensors, and includes a shift control actuator 111 (111) (transmission solenoid valve, etc.) of the transmission 3 and a battery-driven electric oil pump. 8 and the fuel injection valves 121... 121 and the spark plugs 122... 122 of the engine 2, and a gear stage display signal of the automatic transmission 3 is output to the gear stage display means 210. Note that the control circuit 200 and the like describe a part of the control device for the engine 2 and the transmission 3, and other parts of the control device cause signals from the vehicle speed sensor 201 and the accelerator opening sensor 202 to Normal shift control, engine control, and the like based on this signal are separately performed. At this time, when the shift mode detecting means 204 detects that the automatic shift mode is selected, the automatic shift mode is automatically detected based on the shift map according to the signal from the vehicle speed sensor 201 and the signal from the accelerator opening sensor 202. When the shift control is performed and it is detected that the manual shift mode is selected, the shift control is performed according to the occupant's shift operation ( the same applies to the third embodiment and the reference example ).

  The idle stop control according to the second embodiment is performed according to the flowchart shown in FIG. Steps T1 to T14 are the same as steps S1 to S13 of the first embodiment except that step T9 is added. The control circuit 200 of the first embodiment detects each detection at step T1. After inputting the value, various determinations are made in steps T2, T3, T7, T9, and T10. According to these determination results, the engine is stopped in step T4, the engine is restarted in step T8, and in step T5. Control from the first speed to the second speed, control from the second speed to the first speed in step T11, control of maintaining the second speed in step T13, or control of maintaining the current shift stage is performed. When the gear position is controlled in steps T5, T11, and T13, the first gear is displayed on the gear position display means 210 in steps T6, T12, and T14.

  In this case, if the manual shift mode is selected in step T9 (YES), it is determined in step T15 whether or not a manual shift operation (shift stage changing operation) has been performed. As a result, when there is no manual shift operation (NO), the control after step T10 is performed as in the case where the automatic shift mode is selected. On the other hand, if a manual shift operation has been performed (YES), the gear position corresponding to the manual shift operation is controlled in step T16, and the gear position corresponding to the shift operation is also displayed in step T17. To display. In step S16, the upshift may be limited based on the vehicle speed or the like.

  Next, the operation of the idle stop control according to the second embodiment will be described.

  First, when the automatic transmission mode is selected by the occupant (when the manual transmission mode is not selected), the engine is stopped, the engine is restarted, and the first gear of the gear stage is changed from the first speed to the second speed as in the first embodiment. Control to the speed, control from the second gear to the first gear, control to maintain the second gear of the gear, control to maintain the current gear, and the like are performed on the gear display 210. The display is similar to the form. That is, when the gear position after the automatic stop of the engine 2 is controlled from the first speed to the second speed (step T5), the gear position display on the gear position display means 210 is held at the first speed (step T6). When the gear position after restart is controlled from the second speed to the first speed (step T11), the gear position display on the gear stage display means 210 is set to the first speed (step T12), and the gear speed after restart of the engine 2 is changed. When the speed is maintained at the second speed (step T13), the shift speed display on the gear speed display means 210 is set to the first speed (step T14).

  On the other hand, when the manual shift mode is selected by the occupant, different control is performed depending on the presence or absence of the manual shift operation by the occupant during the idle stop. That is, when there is no manual shift operation by the occupant, the control of the engine 2 and the automatic transmission 3 and the shift speed display control to the gear speed display means 210 are the same as when the automatic shift mode is selected. Done. On the other hand, when a manual shift operation is performed by the occupant, the shift speed is controlled to a shift speed corresponding to the manual shift operation (step T16), and the shift speed display on the gear speed display means 210 is determined according to the manual shift operation. (Step T17).

  As described above, according to the second embodiment, in addition to the operational effects described in the first embodiment, the manual shift mode (second mode) for intentionally controlling the shift speed is provided. It is possible to prevent the passenger from feeling uncomfortable due to an unintended shift. That is, since the manual shift mode (second mode) is for intentionally controlling the shift stage as described above, if an unintended shift occurs when the manual shift mode is selected, Although a greater sense of discomfort is given to the occupant than when the automatic transmission mode (first mode) is selected, in the second embodiment, the above-described operation is performed regardless of which transmission mode is selected. When the shift stage is automatically changed, the shift stage display is held at the first speed (minimum speed stage), so the occupant does not notice the change in the shift stage and gives the passenger a sense of incongruity. There is no. Further, as in the first embodiment, since the gear stage is automatically changed from the first speed to the second speed while the engine 2 is automatically stopped, the reverse of the vehicle can be prevented.

  Next, a third embodiment will be described. In the third embodiment, in the second embodiment, the gear position display by the gear position display means is performed only when the manual shift mode is selected.

  The configuration of the control device according to the third embodiment is the same as that of the second embodiment described above, and the description thereof is omitted.

  The idle stop control according to the third embodiment is performed according to the flowchart shown in FIG. Steps U1 to U5, U9 to U13, U17, and U21 to U23 are the same as steps T1 to T5, T7 to T11, T13, and T15 to T17 in the second embodiment. After inputting each detection value at U1, various determinations are made at steps U2, U3, U9, U11, U12, and U21, and according to these determination results, the engine is stopped at step U4 and the engine is restarted at step U10. Start, control from 1st speed to 2nd speed at step U5, control from 2nd speed to 1st speed at step U13, control of 2nd speed maintenance at step U17, or control of maintenance of the current gear stage.

  In addition to the shift control, the control circuit 200 performs display control of the shift stage as follows.

  That is, when the gear position is controlled from the first speed to the second speed in step U5, it is then determined in step U6 whether or not the manual shift mode is selected (executed), and the manual shift mode is selected. If yes (YES), 1st speed is displayed on the gear stage display means 210 in step U7. If the manual shift mode is not selected (NO), the gear stage display means 210 displays the gear stage in step U8. Is not displayed.

  If the gear position is controlled from the second speed to the first speed in step U13, it is determined in step U14 whether or not the manual transmission mode is selected as in step U6, and the manual transmission mode is selected. If (YES), the first gear is displayed on the gear stage display means 210 in step U15, and if the manual shift mode is not selected (NO), the gear stage display means 210 is set to the gear stage in step U16. Do not show.

  Further, when the gear position is maintained at the second speed in step U17, it is determined in step U18 whether or not the manual transmission mode is selected as in steps U6 and U14, and the manual transmission mode is selected ( YES), the first gear is displayed on the gear stage display unit 210 in step U19, and if the manual shift mode is not selected (NO), no gear stage is displayed on the gear stage display unit 210 in step U20. .

  On the other hand, when the gear position is controlled in accordance with the manual gear shift operation in step U22, the gear speed achieved in response to the manual gear shift operation is displayed in step U23.

  Next, the operation of the idle stop control according to the third embodiment will be described.

  The automatic stop / restart of the engine 2 and the shift control of the transmission 3 are performed as in the second embodiment.

  In this case, the display on the gear position display means 210 is not performed at all when the automatic shift mode is selected by the occupant, and only by the occupant during the idle stop only when the manual shift mode is selected. Different control is performed depending on whether or not a manual shift operation is performed. That is, when there is no manual shift operation by the occupant, when the shift stage after the automatic stop of the engine 2 is controlled from the first speed to the second speed (step U5), the shift stage display on the gear stage display means 210 is the first speed. (Step U7), and when the speed stage after restart of the engine 2 is controlled from the second speed to the first speed (step U13), the speed stage display on the gear stage display means 210 is set to the first speed (step U13). U15) When the gear position after restart of the engine 2 is maintained at the second speed (step U17), the gear position display on the gear position display means 210 is set to the first speed (step U19). On the other hand, when a manual shift operation is performed by the occupant, the gear position is controlled to a gear position corresponding to the manual gear shift operation (step U22), and the gear position display on the gear position display means 210 corresponds to the manual gear shift operation. (Step U23).

  As described above, according to the third embodiment, in addition to the function and effect described in the first embodiment, there is a manual shift mode (second mode) for intentionally controlling the shift speed. In addition, in the case where the current gear position of the automatic transmission 3 is displayed on the gear position display means 210 only when the manual gear shift mode is selected, an unintended gear shift occurs as in the second embodiment. This can prevent the passenger from feeling uncomfortable. Further, as in the first embodiment, since the gear stage is automatically changed from the first speed to the second speed while the engine 2 is automatically stopped, the reverse of the vehicle can be prevented.

Next, reference examples of the present invention will be described. In this reference example , when the manual shift mode is selected by the occupant, the idle stop is executed only when the second speed is selected.

That is, as shown in FIG. 8, the vehicle 1 with an idle stop according to this reference example is provided with a control circuit 300 that performs idle stop control, and the control circuit 300 includes the first to third embodiments. Signals from the vehicle speed sensor 301, the accelerator opening sensor 302, the brake switch 303, the shift mode detection means 304, and the selection gear detection means 305 that are the same as those in the embodiment are input.

  The control circuit 300 executes idle stop control based on signals from these switches and sensors, and includes a shift control actuator 111 (111) (transmission solenoid valve or the like) of the transmission 3 and a battery-driven electric oil pump. 8 and the fuel injection valves 121... 121 and spark plugs 122... 122 of the engine 2, and a gear stage display signal of the automatic transmission 3 is output to the gear stage display means 310. When the idle stop is impossible, a control signal is output to the idle stop impossible notification means 311. Here, as the notification means 311, for example, a lamp or a buzzer can be used.

The idle stop control according to this reference example is performed according to the flowchart shown in FIG.

  First, in step V1, each detection value from the sensor or switch is input, and then in step V2, it is determined whether or not an idle stop is being performed. As a result, if the engine is not idling stop (NO), it is determined in step V3 whether or not the manual transmission mode is selected. As a result, if the manual shift mode is not selected (NO), whether or not the vehicle speed is zero (the vehicle speed is equal to or lower than the predetermined vehicle speed and includes almost zero) and the brake switch 303 is turned on in step V4. That is, it is determined whether or not the automatic stop condition of the engine 2 is satisfied. As a result, if not satisfied (NO), the process returns as it is, and if satisfied (YES), the engine 2 is automatically stopped in step V5. That is, the fuel supply by the fuel injection valves 121... 121 and the spark ignition by the spark plugs 122. At this time, the gear position is set to the first speed as a result of shifting according to the normal shift map.

  Next, at step V6, the gear position is controlled from the first speed to the second speed. That is, the transmission control actuators 111... 111 are controlled to supply the hydraulic pressure to the hydraulic chamber of the forward clutch 51 and the engagement chamber 54a of the 2-4 brake 54, and the forward clutch 51 and the 2-4 brake 54 are engaged. Let At this time, as the engine 2 is automatically stopped, the engine-driven oil pump 12 is stopped and the generation of the working oil pressure is stopped. Therefore, the control circuit 300 operates the battery-driven electric oil pump 8. Let

  At this time, the gear stage is not displayed on the gear stage display means 310 in step V7.

  On the other hand, if the manual shift mode is selected in step V3 (YES), it is determined in step V8 whether or not the automatic stop condition of the engine 2 is satisfied as in step V4. In case (NO), the process returns as it is. On the other hand, if satisfied (YES), it is determined in step V9 whether or not the current shift speed is the second speed. As a result, in the case of the second speed (YES), the engine 2 is automatically stopped in Step V10, and the second speed is displayed on the gear stage display means 310 in Step V11.

  On the other hand, if the current gear position is not the second speed in step V9 (NO), it is determined in step V12 that the idling stop impossibility notifying means 311 is operated to allow the occupant to stop idling the engine 2. At the same time, in step V13, the actual gear stage currently achieved is displayed on the gear stage display means 310.

  On the other hand, when the idling stop is being performed in step V2 (YES), it is determined in step V14 whether the brake is turned off, that is, whether the brake switch 303 is turned off, and the vehicle speed is a predetermined vehicle speed. It is determined whether it is larger, that is, whether the restart condition of the engine 2 is satisfied. As a result, if not satisfied in step V14 (NO), the process returns as it is, and if satisfied (YES), the engine 2 is restarted in step V15.

  Note that steps V16 to V24 are the same as steps U12 to U20 of the third embodiment, and the control circuit 300 performs various determinations at steps V16, V18, and V22, and performs steps according to these determination results. The control from the second speed to the first speed at V17, the control of maintaining the second speed at step V21, or the control of maintaining the current shift stage is performed, and the shift to the gear stage display means 310 is performed in conjunction with the shift control. Perform display control of the stage.

Next, the operation of the idle stop control according to this reference example will be described.

  Now, for example, assuming that the vehicle is traveling in the D range 4th speed in the automatic shift mode, when the brake pedal 10 is depressed by the occupant, the vehicle speed gradually decreases and the gear position changes from the 4th speed according to the shift map. It is controlled to the low speed side such as 3rd speed → 2nd speed → 1st speed. In addition, the brake switch 303 is turned on when the brake pedal 10 is depressed. When the vehicle speed becomes zero, counting of the ON duration of the brake switch 303 from when the vehicle speed becomes zero starts. When the duration time reaches a predetermined time, the automatic stop condition of the engine 2 is satisfied and the engine 2 is automatically stopped. In addition, the gear position is controlled from the first speed to the second speed, but since the automatic gear shift mode is being executed, the gear position display means 310 does not display the gear position.

  Then, during idling stop in the automatic transmission mode, when the depression of the brake pedal 10 by the occupant is released and the brake switch 303 is turned off, the restart condition of the engine 2 is satisfied, and the engine 2 is restarted. When the accelerator opening is larger than the predetermined opening, the speed is controlled from the second speed to the first speed. However, since the automatic shift mode is being executed, the gear position display means 310 does not display the gear position. On the other hand, when the accelerator opening is equal to or smaller than the predetermined opening when the engine is restarted, the second speed is maintained, but the gear stage display means 310 does not display the gear stage because the automatic transmission mode is being executed.

  On the other hand, when the automatic transmission stop condition of the engine 2 is satisfied in the state where the manual shift mode is selected, different control is performed thereafter depending on what speed is currently selected by the occupant. That is, when the second speed (predetermined shift speed) is selected by the occupant, the engine 2 is automatically stopped and the second speed is displayed on the gear speed display means 310. At this time, the actual gear position of the transmission 3 is controlled to the second speed. On the other hand, when a gear other than the second speed is selected by the occupant, the idle stop impossibility notifying means 311 notifies that the engine 2 cannot be automatically stopped, that is, the idle stop cannot be performed. The current actual gear stage is displayed on the stage display means 310. At this time, the actual gear position of the transmission 3 is controlled to a gear position corresponding to the manual gear shift operation.

  When the restart condition of the engine 2 is satisfied during the idle stop in the manual shift mode, the engine 2 is restarted. When the accelerator opening is larger than the predetermined opening, the second speed is controlled to the first speed, and the first gear is displayed on the gear stage display means 310. On the other hand, when the accelerator opening is equal to or less than the predetermined opening when the engine is restarted, the second speed is maintained and the first gear is displayed on the gear stage display means 310.

As described above, according to this reference example , when the manual shift mode (second mode) is being executed, only when the second speed (predetermined shift speed) is selected by the occupant's shift operation, the idle stop is performed. In other words, when the gear position other than the second speed is selected during execution of the manual shift mode, the idle stop is not performed, so that the shift to the second speed for preventing the vehicle 1 from moving backward is performed. There is no need to perform control, and as a result, there is no unintentional shift and the passenger is not discomforted. In addition, during the idle stop, the gear position is always the second speed at which the vehicle 1 can be prevented from moving backward, so that the vehicle 1 can also be prevented from moving backward during the idle stop.

  The present invention can be widely applied to vehicles with an idle stop.

It is a schematic diagram of a vehicle with an idle stop according to the first to third embodiments and reference examples . It is a skeleton diagram of an automatic transmission mounted in a vehicle with an idle stop according to first to third embodiments and reference examples . It is a block diagram of the control apparatus of the vehicle with an idle stop which concerns on 1st Embodiment. It is an example of the flowchart of the idle stop control which concerns on 1st Embodiment. It is a block diagram of the control apparatus of the vehicle with an idle stop which concerns on 2nd, 3rd embodiment. It is an example of the flowchart of the idle stop control which concerns on 2nd Embodiment. It is an example of the flowchart of the idle stop control which concerns on 3rd Embodiment. It is a block diagram of the control apparatus of the vehicle with an idle stop which concerns on a reference example . It is an example of the flowchart of the idle stop control which concerns on a reference example .

Explanation of symbols

1 Vehicle with idle stop 2 Engine 3 Automatic transmission 100, 200, 300 Control circuit (idle stop means, transmission means, display means)
101, 201, 301 Vehicle speed sensor (running state detection means)
103, 203, 303 Brake switch (running state detection means)
130, 210, 310 Gear stage display means (display means)
204, 304 Shift mode detection means 205, 305 Selection gear detection means 311 Idle stop impossibility notification means

Claims (2)

  An automatic transmission having a predetermined shift stage capable of preventing the vehicle from moving backward at a speed stage that is not the lowest speed stage on the low speed stage side, and a running state detecting means for detecting a running state of the vehicle including a brake depression state; The engine is automatically stopped when the vehicle running state detected by the running state detection means satisfies the first predetermined condition including that the brake is depressed, and the brake depression is released during the automatic engine stop. Idle stop means for automatically restarting the engine when a second predetermined condition including the above is satisfied, and when the engine is automatically stopped by the idle stop means, the shift stage of the automatic transmission is set to the predetermined shift stage. A control device for a vehicle with an idle stop, comprising: a speed change means for controlling the automatic transmission; and a display means for displaying a current gear position of the automatic transmission. It means, when gear position by the shift means during the automatic stop of the engine is changed from the lowest speed to the predetermined shift speed, the control device of the idle stop with the vehicle, characterized in that to hold the slowest stage display.   The speed change means is a driver that selects one of a first mode that automatically changes speed according to the driving condition of the vehicle detected by the driving condition detection means and a second mode that changes speed according to the occupant's shift operation. The display means displays the current gear position of the automatic transmission during the execution of the second mode and the lowest during the execution of the second mode. 2. The minimum speed display is maintained when the speed is changed from the lowest speed to a predetermined speed by the speed change means when the engine is automatically stopped after stopping at a high speed. The control apparatus of the vehicle with an idle stop as described in.

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