JP5628597B2 - Start control device - Google Patents

Description

  The present invention relates to a vehicle start control device having a belt type continuously variable transmission and having an idle stop function.

  In recent years, from the viewpoint of energy saving and environmental problems, improvement of fuel efficiency and improvement of energy efficiency in vehicles are desired. From such a viewpoint, a vehicle equipped with a continuously variable transmission (CVT) as disclosed in Patent Document 1 below is provided. Further, in order to further improve fuel efficiency, as disclosed in Patent Document 2 below, the engine operation is automatically stopped on condition that a predetermined condition is satisfied when driving is stopped in a signal or the like, There has been provided a vehicle having an idle stop function for automatically restarting an engine when starting.

  Further, as a technique for returning the internal combustion engine to a driving state without causing a delay with respect to the start request immediately after the stop determination of the internal combustion engine by the idle stop function, stop / start control of the internal combustion engine as in Patent Document 3 below. A device is provided. The control device of Patent Document 3 determines whether or not the engine speed is a speed that can return to the self-sustaining rotation, and if it is determined that the engine speed is the self-rotating speed, the engine stop control is stopped. The electronic throttle opening is controlled. Further, the control device of Patent Document 3 performs control for turning off the electronic throttle execution flag, that is, closing the electronic throttle when the engine fails to return to the self-sustaining rotation.

JP 2001-47892 A JP 2003-175747 A Japanese Patent No. 4029891

  In the stop / start control device described in Patent Document 3, the determination of the execution flag for the opening control of the electronic throttle is caused by the engine speed and the elapsed time, and the engine speed does not return to a state where it can rotate independently. As long as the execution flag of the opening control of the electric throttle is off, that is, the electric throttle is kept closed. Therefore, in the prior art of Patent Document 3 described above, when the engine is stopped after the idle stop function is activated, the cranking is finished without returning the engine speed to the independent rotation when the engine is started again. Thus, the electric throttle is maintained in the closed state, and there is a problem that it becomes difficult to travel after starting the engine by a key operation or the like.

  Based on such knowledge, an object of the present invention is to provide an engine start control device capable of running after starting the engine by a key operation or the like when cranking is finished without the engine speed returning to the independent rotation. It was.

The vehicle start control device of the present invention provided to solve the above-described problems includes an accelerator, an engine having a throttle that can adjust the opening degree independently of the opening degree of the accelerator, and the power of the engine. And a belt type continuously variable transmission that transmits the power to the drive wheels, and automatically stops the engine when a predetermined stop condition is satisfied, and closes the throttle when the predetermined start condition is satisfied after the automatic stop. The engine has an idle stop function for automatically starting the engine while performing electronic throttle guard control. The start control device of the present invention, after the start of cranking for automatic start of the engine by the idle stop function, when cranking is finished before the engine returns to self-sustaining rotation, and again after a predetermined time has elapsed. Cranking for automatic start is started, and the electronic throttle guard control is stopped by detecting that the operation of ending the cranking is repeated a predetermined number of times before the engine returns to the independent rotation. Thus, the throttle is opened .

According to this configuration, when the start and end of cranking for the automatic engine start by the idle stop function are repeated for a predetermined number of times, the electronic throttle guard control is stopped , the throttle is opened, and the key is opened. It becomes possible to run after starting the engine by an operation such as the above.

  ADVANTAGE OF THE INVENTION According to this invention, when cranking is complete | finished without an engine speed returning to a self-sustained rotation, the engine start control apparatus which can be made to drive after starting an engine by key operation etc. can be provided.

1 is a skeleton diagram showing a transmission system employed in a vehicle equipped with a start control device according to an embodiment of the present invention. 7 is a timing chart showing the operation status of each part from when the vehicle automatically stops by the idle stop function to when the electronic throttle guard control is completed. It is a flowchart which shows the start control method implemented after the vehicle stops automatically by an idle stop function until it completes electronic throttle guard control.

  Next, a vehicle A equipped with a start control device C according to an embodiment of the present invention will be described in detail with reference to the drawings. The vehicle A of the present embodiment is characterized by its control configuration, but an outline of a transmission system employed in the vehicle A will be described prior to the description of the control configuration portion.

  The vehicle A of this embodiment includes a transmission system T, an engine E, and a start control device C as shown in FIG. The transmission system T is an FF horizontal transmission for an automobile, and is transmitted to the drive shaft 10 by switching the rotation of the input shaft 3 and the input shaft 3 driven by the engine output shaft 1 via the torque converter 2 between forward and reverse. The forward / reverse switching device 4, the continuously variable transmission 7 including the drive pulley 11, the driven pulley 21, and the V belt 15 wound between both pulleys, and the differential device 30 that transmits the power of the driven shaft 20 to the output shaft 32. Etc. The input shaft 3 and the drive shaft 10 are arranged on the same axis, and the driven shaft 20 and the output shaft 32 of the differential device 30 are arranged parallel to the input shaft 3 and non-coaxially. Therefore, the transmission system T has a three-axis configuration as a whole.

  The V-belt 15 employed in this embodiment is a known metal belt composed of a pair of endless tension bands and a large number of blocks supported by these tension bands.

  Each component constituting the transmission system T is accommodated in the transmission case 5. An oil pump 6 is disposed between the torque converter 2 and the forward / reverse switching device 4. Although not shown in FIG. 1, the oil pump 6 includes an oil pump body fixed to the transmission case 5, an oil pump cover fixed to the oil pump body, and between the oil pump body and the oil pump cover. And a pump gear housed in the housing. The pump gear is driven by the pump impeller 2 a of the torque converter 2. The turbine runner 2b of the torque converter 2 is connected to the input shaft 3, and the stator 2c is supported by the transmission case 5 via the one-way clutch 2d.

  The oil pump 6 is operated by power input from the engine E. Accordingly, the operation of the oil pump 6 is interlocked with the engine E. That is, while the engine E is operating, the oil pump 6 is also operated, but when the engine E is stopped, the oil pump 6 is also stopped. Also, by operating the oil pump 6, oil can be pumped toward the hydraulic operation devices such as the forward / reverse switching device 4 and the CVT 7 to be described in detail later, and the line pressure (hydraulic pressure) can be applied. Therefore, the hydraulic pressure cannot be applied to the forward / reverse switching device 4 or the CVT 7 while the engine E is stopped.

  The forward / reverse switching device 4 includes a planetary gear mechanism 40, a reverse brake 50, and a direct coupling clutch 51. The planetary gear mechanism 40 is of a so-called single pinion type, in which a sun gear 41 is connected to the input shaft 3 that is an input rotating member, and a ring gear 42 is connected to the drive shaft 10 that is an output rotating member. . The reverse brake 50 corresponds to the starting clutch in the present invention, and is provided between the carrier 44 that supports the pinion gear 43 and the transmission case 5. The direct coupling clutch 51 is provided between the carrier 44 and the sun gear 41. When the direct clutch 51 is released and the reverse brake 50 is engaged, the rotation of the input shaft 3 is reversed and decelerated and transmitted to the drive shaft 10. Conversely, when the reverse brake 50 is released and the direct clutch 51 is engaged, the carrier 44 and the sun gear 41 of the planetary gear mechanism 40 rotate together, so that the input shaft 3 and the drive shaft 10 are directly connected.

  The drive pulley 11 of the continuously variable transmission 7 includes a fixed sheave 11a, a movable sheave 11b, and a hydraulic servo 12. The fixed sheave 11 a is integrally formed on the shaft of the drive shaft (pulley shaft) 10. The movable sheave 11b is supported on the drive shaft 10 via a roller spline portion so as to be axially movable and integrally rotatable. The hydraulic servo 12 is provided behind the movable sheave 11b. A piston portion extending to the back side is integrally formed on the outer peripheral portion of the movable sheave 11b (not shown), and the outer peripheral portion of this piston portion is an inner peripheral portion of a cylinder (not shown) fixed to the drive shaft 10. Is in sliding contact. A hydraulic oil chamber 12a of the hydraulic servo 12 is formed between the movable sheave 11b and the cylinder, and the shift control is performed by controlling the hydraulic pressure to the hydraulic oil chamber 12a.

  The driven pulley 21 includes a fixed sheave 21a, a movable sheave 21b, and a hydraulic servo 22. The fixed sheave 21 a is integrally formed on the driven shaft (pulley shaft) 20. The movable sheave 21b is supported on the driven shaft 20 via a roller spline portion (not shown) so as to be axially movable and integrally rotatable. The hydraulic servo 22 is provided behind the movable sheave 21b. A cylinder portion (not shown) extending to the back side is integrally formed on the outer peripheral portion of the movable sheave 21b, and a piston (not shown) fixed to the driven shaft 20 is in sliding contact with the inner peripheral portion of the cylinder portion. Yes. A hydraulic oil chamber 22a of the hydraulic servo 22 is formed between the movable sheave 21b and the piston. By controlling the hydraulic pressure of the hydraulic oil chamber 22a, a belt thrust necessary for torque transmission is given. Note that a spring 24 for applying an initial thrust is disposed in the hydraulic oil chamber 22a.

  One end of the driven shaft 20 extends toward the engine E side, and the output gear 27 is fixed to this one end. The output gear 27 meshes with the ring gear 31 of the differential device 30, and power is transmitted from the differential device 30 to the output shaft 32 extending left and right to drive the wheels.

  The engine E is constituted by an internal combustion engine and includes an electronically controlled throttle S that can adjust the opening degree (output). The engine E is connected to the transmission system T described above via the output shaft 1, and power can be input to the torque converter 2 and the oil pump 6. The engine E is operation-controlled so as to operate in cooperation with the CVT 7 described above.

  The vehicle A automatically stops the operation of the engine E by a control signal from the start control device C on condition that the predetermined operating condition is satisfied when the traveling is stopped, and the engine E is automatically started when the vehicle starts. Has a function of restarting (idle stop function). In this embodiment, the opening degree of an accelerator (not shown) is not more than a predetermined opening degree, the vehicle speed is 0 [Km / h], and the water temperature of the engine E is within a predetermined temperature range. The battery power supply voltage is equal to or higher than a predetermined voltage, the battery power supply temperature is within a predetermined temperature range, the battery power supply is sufficiently charged, the brake pedal is on, etc. Is set as the operating condition of the idle stop function. Further, when the accelerator opening degree becomes larger than a predetermined opening degree and the above-mentioned operating condition is not satisfied, the idle stop function is canceled, the engine E is automatically started, and the vehicle A can travel. Return to the state.

  In the vehicle A of the present embodiment, the throttle S opening degree is set in a state where certain conditions are satisfied from the viewpoint of blowing up the engine E immediately after the start of automatic start, preventing shock at the start, and eliminating the feeling of rattling. Control for adjustment (hereinafter also referred to as “electronic throttle guard control”) is performed by the start control device C. Hereinafter, the operation from the start of the automatic start to the start and end of the electronic throttle guard control will be described according to the timing chart shown in FIG. 2, and then described in detail according to the flowchart shown in FIG.

  When the vehicle A is automatically stopped by the idle stop function, the rotation of the engine E is stopped and the throttle S is also closed. Along with this, the oil pump 6 is also stopped, and a state in which no clamping pressure is applied to the V belt 15 (a state in which no line pressure is applied) is entered. After that, when the conditions for restarting the vehicle A such that the accelerator opening becomes larger than the predetermined opening degree are met, cranking is started to restart the engine E. When cranking is started, electronic throttle guard control is started.

  Specifically, when cranking is started, the electronic throttle S is closed. If the engine E reaches a rotation speed at which the engine E can rotate independently during a certain period of cranking, the rotation speed of the engine E thereafter, the pinching pressure acting on the V-belt 15 in the CVT 7, the starting clutch (reverse rotation) The opening degree of the electronic throttle S is adjusted according to the engagement state of the brake 50).

  More specifically, the rotational speed of the engine E reaches a predetermined rotational speed (hereinafter also referred to as a return condition rotational speed RE) or more, the clamping pressure acting on the V belt 15 reaches a predetermined value or more, and the starting clutch When it is confirmed that the (reverse brake 50) has started to be engaged, the throttle S is controlled so that the opening gradually increases at a predetermined increase rate as time elapses. Thereby, the engine E can be prevented from blowing up after the automatic start.

  Thereafter, when it is assumed that the starting clutch has been engaged, the electronic throttle guard control is terminated on the condition. In the present embodiment, the time for completing the engagement of the starting clutch estimated from the generated torque capacity is estimated, and the electronic throttle guard control is terminated assuming that the starting clutch is engaged at this time.

  On the other hand, when the cranking for restarting the engine E is started but the engine E does not reach the rotation speed at which the engine E can rotate independently even after a certain period of time, the cranking ends and the electronic The throttle guard control is once released. As a result, the electronic throttle S is opened. In this case, cranking is started again after a certain period of time has elapsed after the end of cranking. When the engine E is in a state where it can rotate independently by performing cranking again, the rotational speed of the engine E thereafter, the pinching pressure acting on the V belt 15 in the CVT 7, the starting clutch (reverse rotation) The opening degree of the electronic throttle S is adjusted according to the engagement state of the brake 50).

  On the other hand, if the engine E has not reached the rotation speed at which the engine E can rotate independently even though the cranking start and end are repeated a plurality of times (three times in this embodiment), the electronic throttle guard control is performed. Canceled. As a result, the electronic throttle S is opened, and the engine E can be started after being started by a manual operation such as a key.

  Next, control executed when the vehicle A automatically restarts with the idle stop function and then restarts will be described according to the flowchart shown in FIG. When the vehicle A is restarted after being automatically stopped, first, cranking of the engine E is started in step 1 of FIG. 3 and the flag is turned on. Thereafter, the control flow proceeds to step 2, and it is confirmed whether or not the engine speed E has reached the above-described return condition speed RE.

  When the return condition rotational speed RE has not yet been reached in step 2, the control flow proceeds to step 7 and it is confirmed whether or not the engine E is being cranked. If cranking is in progress, electronic throttle guard control is continued (step 10), and the control flow returns to step 2. On the other hand, when the cranking is not being performed, that is, when the engine E has not reached the rotation speed at which the engine E can rotate independently even though the cranking has been performed, the control flow proceeds to step 8 and the electronic throttle guard control is temporarily performed. At the same time, the flag is turned off.

  Thereafter, the control flow proceeds to step 9 where the number of times that the flag has been turned off since the engine E was restarted, that is, the number of crankings repeated for restarting the engine E is n times (this In the embodiment, it is confirmed whether or not n = 3) or more. Here, when the number of times the flag is turned off is less than n times, the control flow is returned to step 1.

  On the other hand, if it is confirmed that the number of times the flag is turned off in step 9 has reached n times or more, the cranking is performed a plurality of times (three times in this embodiment). This is a case where the engine E has not been restarted. Therefore, in this case, the electronic throttle guard control is released to enable manual restart of the engine E by operating a key or the like, and a series of controls for automatically starting the vehicle A Is completed. As a result, the vehicle A is in a state where it can be run after the engine E is started by manually operating the keys and the like.

  If it is confirmed in step 2 that the rotational speed of the engine E has reached the return condition rotational speed RE or more, the control flow proceeds to step 3 to check whether the line pressure is secured, that is, for the V belt 15. It is confirmed whether a pinching pressure of a predetermined value or more is acting. If the line pressure has not yet been secured, the control flow according to steps 7 to 10 is the same as in the case where the rotational speed of the engine E has not reached the return condition rotational speed RE in step 2 above. And the same control is performed.

  On the other hand, when it is confirmed in step 3 that the line pressure is secured, the control flow proceeds to step 4 and it is confirmed whether or not the starting clutch (reverse braking 50) has started engagement. The Here, when the start of engagement of the starting clutch is not confirmed, the control flow is sequentially advanced to the control flow according to Step 7 to Step 10 as described above, and the same control is performed.

  If it is confirmed in step 4 that the starting clutch has started to be engaged, a period of time until it is confirmed that the clutch has been engaged in order to suppress the blow-up of the engine E after the automatic start is maintained. Thus, the opening degree of the electronic throttle S is controlled so as to gradually increase at a predetermined increase rate in conjunction with the passage of time. That is, when the starting clutch starts to be engaged, the control flow proceeds to step 5 to check whether or not the starting clutch has completed the engagement. When the engagement of the starting clutch is not completed, the control flow is returned to step 1 and the opening degree of the electronic throttle S is continuously controlled.

  On the other hand, when it is confirmed in step 5 that the engagement of the starting clutch is completed, the control flow proceeds to step 6 and the electronic throttle guard control is terminated. Thus, a series of controls for restarting the vehicle A is completed, and the opening degree of the throttle S is controlled so as to correspond to the opening degree of the accelerator.

  As described above, the start control device C according to the present embodiment performs the electronic throttle guard when the start and end of cranking are repeated a predetermined number of times in order to automatically start the engine E stopped by the idle stop function. Control is stopped (released), and the engine E can be started by manually operating keys and the like. Therefore, according to the start control device C, even if the engine E cannot be automatically started even if the cranking is repeated a plurality of times, it is ensured that the engine E can be driven manually after the start. Can be possible.

  In the present embodiment, the electronic throttle guard control enters the execution state and the release state in conjunction with the start and end of cranking of the engine E, and therefore more directly than the method for detecting the engine speed as in the prior art. Thus, the execution of electronic throttle guard control can be controlled. Therefore, according to the start control device C of the present embodiment, the control system can be simplified as compared with that of the prior art, and control failure due to erroneous determination can be prevented.

  In the present embodiment, an example in which the release condition of the electronic throttle guard control is that the engine E has not reached the speed at which the engine E can rotate independently when the n-th (n = 2 or more natural number) cranking is completed is illustrated. However, the present invention is not limited to this, and other conditions may be further added as cancellation conditions. Specifically, it may be added as the release condition that the position signal transmitted from the key cylinder for key operation by the driver or the position signal of the shift range satisfies a predetermined condition.

7 Belt type continuously variable transmission (CVT)
E Engine C Start controller S Throttle

Claims (1)

With the accelerator,
An engine with a throttle that can adjust the opening independently of the opening of the accelerator;
A belt type continuously variable transmission that transmits the power of the engine to drive wheels;
The engine is automatically stopped when a predetermined stop condition is satisfied, and the engine is automatically started while electronic throttle guard control is performed to close the throttle when the predetermined start condition is satisfied after the automatic stop. It has an idle stop function,
After cranking for automatic start of the engine by the idle stop function, when cranking is finished before the engine returns to self-sustaining rotation, cranking for automatic start is again performed after a predetermined time has elapsed. Is a starting point,
It is detected that the operation of ending the cranking is repeated a predetermined number of times before the engine returns to the independent rotation, and the electronic throttle guard control is stopped to open the throttle. Vehicle start control device.

Images