JP2015121203A - Engine restart control device for electric parking brake mounted vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve both prevention of an instantaneous drop of a battery voltage and securing of start responsiveness when an engine restart request intervenes during a release shift of an electric parking brake.SOLUTION: An engine restart control device for an electric parking brake mounted vehicle includes: an electric parking brake 7 for actuating a parking brake by an electric motor 6; and an engine controller 20 for performing idle stop control and engine restart control. In this engine restart control device for an electric parking brake mounted vehicle, a battery 9 which is used as a shared power supply used by the electric motor 6, a starter motor 2 and electrical components 14 is mounted on a vehicle. The engine controller 20, during idle stop, when an engine restart requests intervenes during a release shift of the electric parking brake 7, prohibits engine restart when it is in a first section C from release start to the middle of the release, and allows engine restart when it is in a second section D from the middle of the release to the end of the release.

Description

  The present invention relates to an engine restart control device for a vehicle equipped with an electric parking brake that is equipped with an electric parking brake that is operated by an electric motor and that performs engine automatic stop control and engine restart control.

  Conventionally, as an engine restart control device for a vehicle equipped with an electric parking brake, a device that releases an idle stop and automatically restarts the engine on condition that the electric parking brake is released is known (for example, Patent Document 1).

JP 2012-35773 A

  However, in the conventional device, when the engine restart request is issued during the automatic transition stop from the operating state to the release state during the automatic engine stop by the idle stop, the engine restarts after the release of the electric parking brake is completed. Will be started. For this reason, it is possible to avoid an instantaneous drop in the battery voltage due to the overlapping operation of the engine restart and the electric parking brake, but the start responsiveness is poor when releasing the electric parking brake that requires a driver to start as soon as possible There was a problem.

  The present invention has been made paying attention to the above problem, and when an engine restart request intervenes during the release transition of the electric parking brake, it is possible to achieve both prevention of an instantaneous drop in battery voltage and securing of start response. An object of the present invention is to provide an engine restart control device for a vehicle equipped with an electric parking brake.

In order to achieve the above object, an engine restart control device for a vehicle equipped with an electric parking brake according to the present invention includes an electric parking brake, an engine automatic stop control means, and an engine restart control means.
The electric parking brake operates the parking brake by an electric motor.
The engine automatic stop control means performs control to automatically stop the engine when an engine automatic stop condition is satisfied.
The engine restart control means restarts the engine by a starter motor when there is an engine restart request during engine automatic stop and the engine restart is permitted.
In the engine restart control device for the vehicle equipped with the electric parking brake,
A battery is mounted on the vehicle as a common power source used by the electric motor, the starter motor, and electrical components other than the two motors.
The engine restart control means is configured such that when the engine restart request intervenes while the engine is automatically stopped and the electric parking brake is in the transition from the operation state to the release state, the release state of the electric parking brake is changed from the start of release. The engine restart is prohibited when the first section is in the middle of the release, and the engine restart is permitted when the release transition state of the electric parking brake is the second section from the middle of the release to the end of the release.

Therefore, when the engine restart request intervenes during the automatic stop of the engine and when the electric parking brake is shifted from the operating state to the released state, the release transition state of the electric parking brake is the first interval from the start of the release to the middle of the release. If there is, engine restart is prohibited. On the other hand, engine restart is permitted when the release transition state of the electric parking brake is the second section from the middle of the release to the end of the release.
In other words, the motor current value of the electric motor of the electric parking brake changes with a high peak current value from the start of release to the middle of release, but the current waveform characteristics remain low from the middle of release to the end of release. It turned out to show.
Paying attention to this current waveform characteristic, when it is the first section from the start of release to the middle of release, prohibiting engine restart prevents the battery voltage from dropping instantaneously due to the overlapping operation of engine restart and electric parking brake. Is done.
On the other hand, when it is the second section from the middle of the release to the end of the release, by allowing the engine restart, the restart timing is earlier than when the engine is restarted waiting for the end of the release of the electric parking brake, Start response is ensured. In this second section, the engine restart and the electric parking brake are overlapped. However, as described above, the electric motor maintains a low current value, so that an instantaneous drop in the battery voltage is prevented.
As a result, when an engine restart request intervenes during the transition to release of the electric parking brake, it is possible to achieve both prevention of an instantaneous drop in battery voltage and securing of start response.

1 is an overall system diagram illustrating a vehicle equipped with an electric parking brake to which an engine restart control device according to a first embodiment is applied. It is the schematic which shows the electric parking brake which operates a parking brake with the electric motor of Example 1. FIG. It is a current waveform diagram which shows the change of the motor current from the fastening start output to the electric motor of an electric parking brake based on a fastening request | requirement to the completion | finish of fastening. It is a current waveform diagram which shows the change of the motor current from the cancellation | release start output to the completion | finish of cancellation | release output to the electric motor of an electric parking brake based on a cancellation | release request. It is a flowchart which shows the flow of the engine restart control process from the idle stop performed by the engine controller of Example 1. FIG. 6 is a time chart showing characteristics of engine rotation, engine state, brake, idling stop state, electric parking brake operation state, electric parking brake current consumption, and battery voltage when the engine is restarted in a vehicle equipped with an electric parking brake of a comparative example. . 4 is a time chart showing characteristics of engine rotation, engine state, brake, idling stop state, electric parking brake operating state, electric parking brake current consumption, and battery voltage when the engine is restarted in the vehicle equipped with the electric parking brake of the first embodiment. is there. It is a flowchart which shows the flow of the engine restart control process from the time of the idle stop performed with the engine controller of Example 2. FIG. It is a flowchart which shows the flow of the engine restart control process from the idling stop performed with the engine controller of Example 3. FIG.

  Hereinafter, the best mode for realizing an engine restart control device for a vehicle equipped with an electric parking brake according to the present invention will be described based on Examples 1 to 3 shown in the drawings.

First, the configuration will be described.
The configuration of the engine restart control device for the vehicle equipped with the electric parking brake in the first embodiment will be described separately as "the overall system configuration", "the configuration of the electric parking brake", and "the engine restart control configuration".

[Overall system configuration]
FIG. 1 shows a vehicle equipped with an electric parking brake to which the engine restart control device of the first embodiment is applied. The overall system configuration will be described below with reference to FIG.

  As shown in FIG. 1, the vehicle equipped with the electric parking brake includes an engine 1, a starter motor 2, a continuously variable transmission 3, a propeller shaft 4, a drive shaft 5, an electric motor 6, and an electric parking brake 7. And drive wheels 8 and a battery 9.

  In the starter motor 2, a motor gear 10 provided on a motor shaft meshes with a crank gear 11 provided on a crankshaft of the engine 1. When the engine is restarted, the engine 1 is cranked according to a motor drive command from the engine controller 20 to be described later to the starter motor drive circuit 12.

  The continuously variable transmission 3 is a transmission that changes the gear ratio steplessly in response to a shift command from a transmission controller 21 described later. The driving force from the continuously variable transmission 3 is transmitted to the drive wheels 8 via the propeller shaft 4 → the differential gear (not shown) → the drive shaft 5.

  The electric parking brake 7 operates a parking brake that maintains the braking state of the drive wheels 8 by the electric motor 6. The electric motor 6 performs a parking brake engagement operation and a parking brake release operation based on a motor drive command from the electric parking brake controller 22 described later to the electric motor drive circuit 13 when the parking brake is engaged and when the parking brake is released.

  The battery 9 is a 12 V to 14 V battery mounted on the vehicle as a common power source used by the electric motor 6, the starter motor 2, and the electrical components 14 other than the motors 2 and 6. This battery 9 is charged by an unillustrated alternator driven by the engine 1. Here, the electrical component 14 is a variety of equipment that uses a battery 9 mounted on the vehicle as a power source, such as exterior components such as headlights, interior components such as vehicle interior lamps and display panels, and electric actuators such as door mirror motors. Including goods.

  As shown in FIG. 1, the control system of the engine 1 includes an engine controller 20, a transmission controller 21, and an electric parking brake controller 22 (hereinafter referred to as "EPKB controller 22"). These controllers 20, 21, and 22 are connected by a CAN communication line 23 that can exchange information by bidirectional communication.

  The engine controller 20 performs idle stop control that is engine automatic stop control and engine restart control that restarts the engine 1 that has been automatically stopped. The idle stop control automatically stops the engine 1 when an idle stop condition (for example, a brake pedal depression condition, an accelerator release condition, a select lever position condition, etc.) is established when the vehicle is stopped. In the engine restart control, when there is an engine restart request during the engine automatic stop by the idle stop control and the engine restart is permitted, the engine 1 is restarted by cranking by the starter motor 2. The engine controller 20 receives necessary information from the CAN communication line 23, the engine speed sensor 24, and the foot brake switch 25.

  The transmission controller 21 receives sensor information from the vehicle speed sensor 26 and the accelerator opening sensor 27, sets a gear ratio determined by the vehicle speed and the accelerator opening as a target gear ratio, and shifts the actual gear ratio to the target gear ratio. Take control.

  The EPKB controller 22 receives signals from the parking brake switch 28, the motor consumption current sensor 29, and the actuator position sensor 30. When an OFF → ON signal (engagement request) is input by a driver operation to the parking brake switch 28, parking brake engagement operation control is performed by a motor drive command to the electric motor drive circuit 13. On the other hand, when an ON → OFF signal (release request) is input by a driver operation to the parking brake switch 28, parking brake release operation control is performed by a motor drive command to the electric motor drive circuit 13.

[Configuration of electric parking brake]
2 shows an electric parking brake 7 for operating a parking brake by the electric motor 6, FIG. 3 shows a change in motor current from the start of engagement to the end of engagement, and FIG. 4 shows a motor from the start of release to the end of release. Shows the change in current. Hereinafter, the configuration of the electric parking brake 7 will be described with reference to FIGS.

  As shown in FIG. 2, the electric parking brake 7 has brake pads 72 and 73 disposed on both sides of the brake disc 71 and covers both brake pads 72 and 73 with a brake caliper 74. A brake piston 75 slidably provided on the brake caliper 7 is disposed so as to face the brake pad 73, and an actuator shaft 76 disposed inside the brake piston 75 is stroked by the electric motor 6. In addition, a gear reduction mechanism (not shown) is interposed between the motor shaft of the electric motor 6 and the reduction rotation shaft 77 to reduce the rotation of the motor shaft. The reduction rotation shaft 77 and the actuator shaft 76 are screw-fitted to form a motion conversion mechanism that converts the reduction rotation motion of the reduction rotation shaft 77 into the linear motion of the actuator shaft 76.

  With the above configuration, when the electric parking brake 7 is engaged, the actuator shaft 76 and the brake piston 75 are stroked in the direction of arrow A in FIG. Due to the engagement stroke of the brake piston 75, the brake pads 72 and 73 clamp both surfaces of the brake disc 71 and stop the operation of the brake disc 71. When releasing the electric parking brake 7, the actuator shaft 76 and the brake piston 75 are stroked in the direction of arrow B in FIG. Due to the release stroke of the brake piston 75, the brake pads 72, 73 that sandwiched both surfaces of the brake disc 71 are separated from the brake disc 71 and release the braking of the brake disc 71.

  The change in the motor current from the start to the end of engagement of the electric parking brake 7 is as shown in FIG. In other words, in the initial stage of fastening from the EPKB fastening start time t0 to the time t1, it sharply rises with a high peak current value and then falls sharply. A low current value is maintained during the middle of the period from time t1 to time t2. In the second half of the engagement from time t2, current waveform characteristics rise from a low current value until a time t3 with a gentle gradient, and when reaching the peak current at time t3, suddenly drop to zero current at a stroke toward the engagement end time t4. Indicates.

  The change in motor current from the start of release of the electric parking brake 7 to the end of release is as shown in FIG. In other words, in the first half of the release period from the EPKB release start time t0, the release current jumps rapidly with a high peak current value at the release start instant from time t0 to time t1. From time t1 to time t2, the high peak current value decreases due to a gentle gradient. The late release period from time t2 shows a current waveform characteristic that maintains a low current value from time t2 to time t3 and decreases from a low current value to zero current value from time t3 to release end time t4. In FIG. 4, a section in which the motor current is high from time t0 to time t2 is referred to as “first section C”, and a section in which the motor current transitions from time t2 to time t4 is referred to as “second section D”. .

[Engine restart control configuration]
FIG. 5 shows the flow of engine restart control processing from idling stop executed by the engine controller 20 of the first embodiment (engine restart control means). Hereinafter, each step of FIG. 5 showing the engine restart control processing configuration of the first embodiment will be described.

  In step S1, following the start, or following the determination that the electric parking brake 7 is not being released from being engaged in step S2, it is determined whether or not the engine is idling. If YES (during idle stop), the process proceeds to step S2. If NO (not idle stop), the process proceeds to the end.

  In step S2, following the determination in step S1 that the engine is idling or in step S3, it is determined that the engine restart request is not being performed. Judging. If YES (during release operation), the process proceeds to step S3. If NO (no release operation), the process returns to step S1.

  In step S3, following the determination that the release operation is being performed in step S2, it is determined whether an engine restart request is being made. If YES (engine restart is being requested), the process proceeds to step S4. If NO (engine restart is not being requested), the process returns to step S2.

  In step S4, following the determination that the engine restart request is being made in step S3 or the engine restart prohibition in step S6, the electric parking brake 7 is electrically operated based on the sensor signal from the motor consumption current sensor 29. The motor current consumption by the motor 6 is confirmed, and the process proceeds to step S5.

In step S5, following the motor consumption current confirmation of the electric parking brake 7 in step S4, it is determined whether or not the consumption current of the electric parking brake 7 has fallen below a predetermined value. If YES (EPBK consumption current <predetermined value), the process proceeds to step S7. If NO (EPBK consumption current ≧ predetermined value), the process proceeds to step S6.
Here, the “predetermined value” is set to a value equal to or less than the current consumption value of the electric motor 6 that suppresses the instantaneous drop of the battery voltage when the starter motor 2 and the electric motor 6 are simultaneously operated.
“Instantaneous drop in battery voltage” is a phenomenon in which the battery voltage instantaneously drops to a zero voltage range when the current taken out from the battery 9 suddenly increases when the starter motor 2 and the electric motor 6 are operated simultaneously. Say.

  In step S6, following the determination that EPBK current consumption ≧ predetermined value in step S5, an engine restart request is being made, but an engine restart prohibition flag for prohibiting restart of the engine 1 is set, and the process proceeds to step S4. Return.

  In step S7, following the determination that EPBK current consumption <predetermined value in step S5, an engine restart permission flag for permitting restart of the engine 1 is set in response to an engine restart request, and the process proceeds to the end.

Next, the operation will be described.
The operation of the engine restart control device for the vehicle equipped with the electric parking brake according to the first embodiment will be described by dividing it into “subject of comparative example”, “engine restart control operation”, and “characteristic operation of engine restart control”.

[Problems of comparative example]
If there is an engine restart request while the electric parking brake is operating during idle stop, engine restart is prohibited until the end of engagement / end of release regardless of the direction of operation of the electric parking brake (engagement direction, release direction). This is a comparative example.

  The reason for prohibiting the engine restart until the electric parking brake of the comparative example is released is that the current value to the electric motor from the start of the electric parking brake release to the end of the release is higher due to the trapezoidal current waveform characteristics. This is because it was thought to change.

  Therefore, in the case of the comparative example, the instantaneous drop in battery voltage due to the overlapped operation of the engine restart and the electric parking brake is avoided, but the start responsiveness when releasing the electric parking brake that requires the driver to start as soon as possible Becomes worse.

In the above comparative example, the engine restart control action when an engine restart request intervenes during idle stop and when the electric parking brake is released will be described based on the time chart shown in FIG.
In FIG. 6, t1 is the engine cranking start time, t2 is the engine independent operation start time, t3 is the foot brake release time, t4 is the foot brake stepping time, t5 is the EPKB fastening start time, and t6 is the EPKB fastening end time. . t7 is idling stop start time, t8 is engine stop time, t9 is EPKB release start time, t10 is engine restart request time, t11 is EPKB release end time, t12 is engine restart start time, t13 is cranking start time, t14 is the cranking end time.

  First, from the running state from time t3, when the foot brake is depressed at time t4, and when the electric parking brake is engaged at time t5 and the engagement is terminated at time t6, the idling stop is then performed at time t7. Is started, and the engine is stopped at time t8. When a predetermined time elapses in the engine stop state and a release request is issued from the driver at time t9, the release of the electric parking brake is started. If an engine restart request (brake OFF restart request) intervenes based on the foot brake release operation at time t10 immediately after the start of releasing the electric parking brake, the engine restarts until the release of the electric parking brake is completed at time t11. Waits. Then, engine restart is started at time t12, and after the cranking from time t13 to t14 has elapsed, the engine is put into an operating state by restart.

  That is, the engine restart is started after the waiting time TL from the time when the engine restart request is issued at time t10 to the time t12 has elapsed. For this reason, in response to the engine restart request due to the driver's brake OFF operation, the start response from the engine restart request to the actual vehicle start is reduced.

[Engine restart control action]
As described above, when an engine restart request intervenes during the idling stop and the release operation of the electric parking brake 7, there is a request for improving the start response. Hereinafter, the engine restart control action of the first embodiment reflecting this requirement will be described with reference to FIGS. 5 and 7.

  Assume that an idle stop is being performed, the electric parking brake 7 is in a releasing operation from the engagement, and an engine restart request is being satisfied. At this time, in the flowchart of FIG. 5, the process proceeds from step S 1 → step S 2 → step S 3 → step S 4. In step S4, the motor current consumption by the electric motor 6 of the electric parking brake 7 is confirmed based on the sensor signal from the motor current consumption sensor 29. In the next step S5, it is determined whether or not the motor consumption current of the electric parking brake 7 has fallen below a predetermined value. If it is determined that EPBK consumption current ≧ predetermined value, the process proceeds to step S6 and engine restart is prohibited. The

  Then, while it is determined in step S5 that EPBK consumption current ≧ predetermined value, the flow from step S4 to step S5 to step S6 is repeated, and prohibition of engine restart is maintained. Thereafter, when it is determined in step S5 that the EPBK current consumption is smaller than the predetermined value, the process proceeds from step S5 to step S7 → end, and in step S7, although the electric parking brake 7 is in the release operation, In response to the engine restart request, restart of the engine 1 is permitted.

In the first embodiment, the engine restart control action when an engine restart request intervenes during idle stop and during the release transition of the electric parking brake 7 will be described based on the time chart shown in FIG.
In FIG. 7, t1 is the engine cranking start time, t2 is the engine self-sustained operation start time, t3 is the foot brake release time, t4 is the foot brake stepping time, t5 is the EPKB engagement start time, and t6 is the EPKB engagement end time . t7 is idling stop start time, t8 is engine stop time, t9 is EPKB release start time, t10 is engine restart request time, t11 is engine restart start time, t12 is cranking start time, t13 is EPKB release end time, t14 is the cranking end time.

  First, when the foot brake is depressed at time t4 from the running state from time t3, and engagement of the electric parking brake 7 is started at time t5 and the engagement is terminated at time t6, then idling is performed at time t7. The stop is started, and the engine 1 is stopped at time t8. When a predetermined time elapses in the engine stopped state and a release request is issued from the driver at time t9, the release of the electric parking brake 7 is started. When an engine restart request (brake OFF restart request) intervenes based on the foot brake release operation at time t10 immediately after the start of releasing the electric parking brake 7, the engine restart is started at time t11. That is, the engine restart is started at time t11 when the EPBK consumption current falls below a predetermined value without waiting for the electric parking brake 7 to be released. Thereafter, cranking is started at time t12, release of the electric parking brake 7 is finished at time t13, and after finishing cranking at time t14, the engine is put into an operating state by restarting.

  Thus, when an engine restart request is issued at time t10, engine restart is started after a short waiting time TS (<TL) until time t11. For this reason, in response to the engine restart request due to the driver's brake OFF operation, the start response from the engine restart request to the actual vehicle start is improved. Note that the battery voltage from the EPKB release start time t9 to immediately after the cranking end time t14 shows the characteristics within the frame of the arrow E in FIG. 7, and there is no instantaneous drop in the battery voltage. This point is also clear from the fact that it is equivalent to the battery voltage characteristic from the EPKB release start time t9 to the time immediately after the cranking end time t14 in the comparative example, as shown by the in-frame characteristics of the arrow F in FIG. .

[Characteristics of engine restart control]
In the first embodiment, when an engine restart request intervenes during an idle stop and an electric parking brake 7 release transition, the release transition state of the electric parking brake 7 is the first section C from the start of the release to the middle of the release. Prohibit engine restart. On the other hand, the engine restart is permitted when the release transition state of the electric parking brake 7 is the second section D from the middle of the release to the end of the release.

That is, as shown in FIG. 4, the motor current value of the electric motor 6 of the electric parking brake 7 changes with a high peak current value in the first section C from the start of release to the middle of release. However, it has been found that the second section D from the middle of the release to the end of the release shows a current waveform characteristic while maintaining a low current value. According to the current waveform characteristic thus found, the second section D from the middle of the release of the electric parking brake 7 to the end of the release has a small motor current value and there is no problem with the instantaneous drop of the battery voltage. It turns out that engine restart is prohibited in vain.
Paying attention to this current waveform characteristic, when it is the first section C from the start of the release to the middle of the release, the engine restart is prohibited, so that the battery voltage instantaneously decreases due to the overlapping operation of the engine restart and the electric parking brake 7. Is prevented.
On the other hand, in the second section D from the middle of the release to the end of the release, the engine restart is permitted, so that the restart timing is earlier than when the engine is restarted after the release of the electric parking brake 7 is waited. Thus, start response is ensured. In the second section D, the engine restart and the electric parking brake 7 are overlapped. However, as described above, the electric motor 6 maintains a low current value, so that an instantaneous drop in the battery voltage is prevented.
As a result, when an engine restart request intervenes during the transition to release of the electric parking brake 7, it is possible to achieve both prevention of an instantaneous drop in battery voltage and securing of start response.

In the first embodiment, when the current value of the electric motor 6 that can suppress the instantaneous drop of the battery voltage during simultaneous operation of the starter motor 2 and the electric motor 6 is used as a threshold value, the current value of the electric motor 6 is the threshold value in the first section C. A higher section is set, and the second section D is set to a section where the current value of the electric motor 6 is lower than the threshold value.
As described above, the second section D is set to a section where the current value of the electric motor 6 is lower than the threshold value at which the instantaneous drop of the battery voltage is suppressed when the starter motor 2 and the electric motor 6 are operated simultaneously. Even if the engine restart is permitted at D, an instantaneous drop in the battery voltage is reliably prevented.
Therefore, when the release transition state of the electric parking brake 7 is the second section D, even if the engine restart and the electric parking brake 7 are operated repeatedly, it is possible to reliably prevent the battery voltage from dropping instantaneously.

In the first embodiment, when the engine restart request intervenes during the idle stop and the electric parking brake 7 is shifted from the operating state to the released state, the detected current consumption of the electric motor 6 is greater than or equal to a predetermined value. Prohibit engine restart. The engine restart is permitted when the detected current consumption of the electric motor 6 falls below a predetermined value.
In this way, by using the current consumption of the electric motor 6 and determining whether the engine restart is prohibited / permitted based on the magnitude of the current consumption, it is as if the determination was made while monitoring the current waveform characteristics shown in FIG. The engine restart is prohibited / permitted with high accuracy.
Therefore, when the engine restart prohibition / permission determination is performed, the current consumption of the electric motor 6 is used as the determination information, so that the determination with high accuracy can be performed.

Next, the effect will be described.
In the engine restart control device for the vehicle equipped with the electric parking brake of the first embodiment, the effects listed below can be obtained.

(1) an electric parking brake 7 for operating the parking brake by the electric motor 6;
When an engine automatic stop condition (idle stop condition) is satisfied, an engine automatic stop control means (engine controller 20) that performs control to automatically stop the engine 1;
Engine restart control means (engine controller 20) for restarting the engine 1 by the starter motor 2 when the engine is automatically stopped (during idle stop), the engine restart is requested, and the engine restart is permitted; ,
In an engine restart control device for a vehicle equipped with an electric parking brake,
A battery 9 is mounted on the vehicle as a common power source used by the electric motor 6, the starter motor 2, and the electrical components 14 other than the motors 2 and 6,
The engine restart control means (engine controller 20) is configured such that when an engine restart request intervenes during automatic engine stop (idle stop) and when the electric parking brake 7 is shifted from an operating state to a released state, Engine restart is prohibited when the release transition state of the electric parking brake 7 is the first section C from the start of release to the middle of release, and the second section from the middle of release to the end of release of the electric parking brake 7 When D, engine restart is permitted (FIG. 5).
For this reason, when an engine restart request intervenes during the release transition of the electric parking brake 7, it is possible to achieve both prevention of an instantaneous drop in the battery voltage and securing of start response.

(2) When the electric motor brake 7 shifts from the operating state to the released state, the electric motor 6 decreases after the current value increases from the start of the release to the middle of the release, and decreases from the middle of the release to the end of the release. Shows the current waveform characteristics where the value is maintained (FIG. 4),
The engine restart control means (engine controller 20) uses the current value of the electric motor 6 that suppresses an instantaneous drop in battery voltage during simultaneous operation of the starter motor 2 and the electric motor 6 as a threshold value. The section C is set to a section where the current value of the electric motor 6 is higher than the threshold value, and the second section D is set to a section where the current value of the electric motor 6 is lower than the threshold value (FIG. 4).
For this reason, in addition to the effect of (1), when the release transition state of the electric parking brake 7 of the electric parking brake 7 is the second section D, it is ensured even if the engine restart and the electric parking brake 7 are operated redundantly. It is possible to prevent an instantaneous drop in battery voltage.

(3) Providing motor consumption current detecting means (motor consumption current sensor 29) for detecting consumption current of the electric motor 6,
The engine restart control means (engine controller 20, FIG. 5) has an engine restart request intervening during automatic release of the engine (during idle stop) and when the electric parking brake 7 is shifted from the operating state to the released state. When the detected current consumption of the electric motor 6 is greater than or equal to a predetermined value, the engine restart is prohibited (S5 → S6 in FIG. 5), and when the detected current consumption of the electric motor 6 falls below the predetermined value. The engine restart is permitted (S5 → S7 in FIG. 5).
For this reason, in addition to the effect of (1) or (2), when the prohibition / permission determination of engine restart is performed, the current consumption of the electric motor 6 can be used as determination information, so that accurate determination can be performed. .

  The second embodiment is an example in which the release operation duration time of the electric parking brake is used as the determination information when the engine restart prohibition / permission determination is performed.

First, the configuration will be described.
FIG. 8 shows a flow of engine restart control processing from idling stop executed by the engine controller 20 of the second embodiment (engine restart control means). Hereinafter, each step of FIG. 8 showing the engine restart control processing configuration of the second embodiment will be described. Each step from step S21 to step S23 corresponds to each step from step S1 to step S3 in FIG. Step S26 and step S27 correspond to step S6 and step S7 in FIG. Therefore, description of these steps is omitted.

  In step S28, following the determination that the release operation is being performed in step S22, a release operation duration time that is an elapsed time from the start of release of the electric parking brake 7 is calculated, and the process proceeds to step S23. The release operation duration time is calculated by adding the timer value started from the start of release by counting.

  In step S24, following the determination that the engine restart request is being made in step S23, or the engine restart prohibition in step S26, the release operation continuation time from the start of release of the electric parking brake 7 is confirmed. Proceed to S25.

In step S25, following the confirmation of the release operation duration time of the electric parking brake 7 in step S24, it is determined whether or not the release operation duration time of the electric parking brake 7 exceeds a predetermined value. If YES (release operation continuation time> predetermined value), the process proceeds to step S27. If NO (release operation continuation time ≦ predetermined value), the process proceeds to step S6.
Here, the “predetermined value” is set to a value corresponding to the release operation continuation time that passes through the first section C and enters the second section D in the current waveform characteristics shown in FIG.
Since the system configuration is the same as that of the first embodiment shown in FIGS.

Next, the operation will be described.
Assume that an idle stop is being performed, the electric parking brake 7 is in a releasing operation from the engagement, and an engine restart request is being satisfied. At this time, in the flowchart of FIG. 8, the process proceeds from step S21 → step S22 → step S28 → step S23 → step S24. In step S24, the release operation duration time from the start of release of the electric parking brake 7 is confirmed. In the next step S25, it is determined whether or not the release operation continuation time from the start of release of the electric parking brake 7 exceeds a predetermined value. If it is determined that the release operation continuation time ≦ predetermined value, the process proceeds to step S26. Engine restart is prohibited.

  Then, while it is determined in step S25 that the release operation continuation time ≦ predetermined value, the flow from step S24 → step S25 → step S26 is repeated, and prohibition of engine restart is maintained. Thereafter, when it is determined in step S25 that the release operation duration time is greater than the predetermined value, the process proceeds from step S25 to step S27 → end, and in step S27, although the electric parking brake 7 is in the release operation. In response to the engine restart request, the restart of the engine 1 is permitted.

As described above, in the second embodiment, when the engine restart request intervenes while the electric parking brake 7 is in the release transition from the operating state to the release state during the idle stop, the release from the start of the release operation of the electric parking brake 7 is performed. Monitor the operation duration. Then, when the engine restart request intervenes during the transition of the electric parking brake 7 from the operation state to the release state, the engine restart is prohibited if the release operation duration is less than or equal to a predetermined value, and the release operation duration is The engine is allowed to restart when it exceeds a predetermined value.
Thus, the engine restart prohibition / permission determination is performed based on the length of the release operation continuation time using the release operation continuation time from the start of release of the electric parking brake 7. For this reason, the engine restart prohibition / permission determination is performed with high accuracy in the same manner as when determining while monitoring the transition of the current waveform characteristic from the first section C to the second section D shown in FIG.
Therefore, when the prohibition / permission determination of engine restart is performed, it is possible to perform a highly accurate determination by using the release operation duration time of the electric parking brake 7 as determination information.
Since other operations are the same as those of the first embodiment, description thereof is omitted.

Next, the effect will be described.
In the engine restart control device for a vehicle with an electric parking brake according to the second embodiment, the following effects can be obtained.

(4) The engine restart control means (engine controller 20, FIG. 8) monitors the release operation continuation time from the start of the release operation of the electric parking brake 7 during automatic engine stop (idle stop) (FIG. 8). S28), when an engine restart request intervenes during the transition of the electric parking brake 7 from the operation state to the release state, the engine restart is prohibited if the release operation duration is less than a predetermined value (see FIG. 8 S25 → S26), the engine restart is permitted when the release operation continuation time exceeds a predetermined value (S25 → S27 in FIG. 8).
For this reason, in addition to the effect of (1) or (2) of the first embodiment, when the prohibition / permission determination of engine restart is performed, the release operation continuation time of the electric parking brake 7 is used as determination information. A good decision can be made.

  The third embodiment is an example in which the actuator position of the electric parking brake is used for the determination information when the engine restart prohibition / permission determination is performed.

First, the configuration will be described.
FIG. 9 shows a flow of engine restart control processing from idling stop executed by the engine controller 20 of the third embodiment (engine restart control means). Hereinafter, each step of FIG. 9 showing the engine restart control processing configuration of the third embodiment will be described. Each step from step S31 to step S33 corresponds to each step from step S1 to step S3 in FIG. Step S36 and step S37 correspond to step S6 and step S7 in FIG. Therefore, description of these steps is omitted.

  In step S34, following the determination that the engine restart is being requested in step S33, or the engine restart prohibition in step S36, the electric motor of the electric parking brake 7 is based on the sensor signal from the actuator position sensor 30. 6 confirms the actuator position and proceeds to step S35.

In step S35, following the actuator position confirmation of the electric parking brake 7 in step S34, it is determined whether or not the actuator position of the electric parking brake 7 exceeds a predetermined value. If YES (actuator position> predetermined value), the process proceeds to step S37. If NO (actuator position ≦ predetermined value), the process proceeds to step S26.
Here, the “predetermined value” is set to a value equal to or greater than the actuator position of the electric parking brake 7 that suppresses the instantaneous drop of the battery voltage when the starter motor 2 and the electric motor 6 are simultaneously operated.
Since the system configuration is the same as that of the first embodiment shown in FIGS.

Next, the operation will be described.
Assume that an idle stop is being performed, the electric parking brake 7 is in a releasing operation from the engagement, and an engine restart request is being satisfied. At this time, in the flowchart of FIG. 9, the process proceeds from step S31 to step S32 to step S33 to step S34. In step S34, the actuator position of the electric parking brake 7 is confirmed. In the next step S35, it is determined whether or not the actuator position of the electric parking brake 7 has exceeded a predetermined value. If it is determined that the actuator position ≦ the predetermined value, the process proceeds to step S36 and engine restart is prohibited.

  While it is determined in step S35 that the actuator position ≦ predetermined value, the flow from step S34 → step S35 → step S36 is repeated, and prohibition of engine restart is maintained. Thereafter, when it is determined in step S35 that the actuator position> predetermined value, the process proceeds from step S35 to step S37 → end, and in step S37, the engine is operated even though the electric parking brake 7 is being released. In response to the restart request, restart of the engine 1 is permitted.

As described above, in the third embodiment, when the engine restart request intervenes during the idle stop and the electric parking brake 7 is shifted from the operating state to the released state, the actuator position of the electric parking brake 7 is below a predetermined value. If it is, engine restart is prohibited. The engine restart is permitted when the actuator position of the electric parking brake 7 exceeds a predetermined value.
In this way, using the actuator position of the electric parking brake 7, the engine restart prohibition / permission determination is performed based on the actuator arrival position. For this reason, the engine restart is prohibited with high accuracy by obtaining the position where the actuator reaches when passing through the first section C of the current waveform characteristic shown in FIG. / A permission decision is made.
Therefore, when the prohibition / permission determination of engine restart is performed, it is possible to perform a highly accurate determination by using the actuator position of the electric parking brake 7 as the determination information.
Since other operations are the same as those of the first embodiment, description thereof is omitted.

Next, the effect will be described.
In the engine restart control device for a vehicle with an electric parking brake according to the third embodiment, the following effects can be obtained.

(5) provided with an actuator position detecting means (actuator position sensor 30) for detecting an actuator position by the operation of the electric motor 6 of the electric parking brake 7;
The engine restart control means (engine controller 20, FIG. 9) has an engine restart request intervening during automatic release of the engine (during idle stop) and when the electric parking brake 7 is shifted from the operating state to the released state. When the actuator position of the electric parking brake 7 is below a predetermined value, the engine restart is prohibited (S35 → S36 in FIG. 9), and when the actuator position of the electric parking brake 7 exceeds a predetermined value, the engine restart is performed. Permitted (S35 → S37 in FIG. 9).
For this reason, in addition to the effect of (1) or (2) of the first embodiment, when the prohibition / permission determination of engine restart is performed, the actuator position of the electric parking brake 7 is used as determination information, so that accurate determination can be made. It can be performed.

  As mentioned above, although the engine restart control apparatus of the electric parking brake mounting vehicle of this invention has been demonstrated based on Examples 1-3, it is not restricted to these Examples about a concrete structure, Claim Design changes and additions are permitted without departing from the spirit of the invention according to each claim of the scope.

  In the first to third embodiments, an example in which the engine restart control device of the present invention is applied to an engine vehicle in which only an engine is mounted as a drive source is shown. However, the engine restart control device of the present invention can also be applied to a hybrid vehicle in which an engine and a traveling motor / generator are mounted as drive sources. The engine type may be a gasoline engine or a diesel engine. Further, the type of transmission is not limited to a continuously variable transmission, and may be a stepped automatic transmission, a manual transmission (MT), an automatic MT, or the like. In short, any vehicle equipped with an engine and an electric parking brake can be applied.

  In the first to third embodiments, the example of the idle stop control means for performing the idle stop control is shown as the engine automatic stop means. However, the engine automatic stop means may be coast stop control means for performing coast stop control for automatically stopping the engine from the coast deceleration state.

  In the first to third embodiments, as the electric parking brake 7, brake pads 72 and 73 are disposed on both surfaces of the brake disk 71, both brake pads 72 and 73 are covered with a brake caliper 74, and a brake piston provided on the brake caliper 74 The structural example which strokes 75 with the electric motor 6 was shown. However, as an example of an electric parking brake, an electric motor is used as a lever operating actuator at a parking brake lever position of a wire cable type parking brake mechanism as described in JP 2012-35773 A, for example. Also good.

DESCRIPTION OF SYMBOLS 1 Engine 2 Starter motor 3 Continuously variable transmission 4 Propeller shaft 5 Drive shaft 6 Electric motor 7 Electric parking brake 8 Drive wheel 9 Battery 14 Electrical component 20 Engine controller (engine automatic stop control means, engine restart control means)
21 Transmission controller 22 Electric parking brake controller 28 Parking brake switch 29 Motor consumption current sensor (motor consumption current detection means)
30 Actuator position sensor (Actuator position detection means)

Claims (5)

An electric parking brake for operating a parking brake by an electric motor;
When the engine automatic stop condition is satisfied, engine automatic stop control means for performing control to automatically stop the engine;
An engine restart control means for restarting the engine by a starter motor when the engine restart is requested and the engine restart is permitted during the engine automatic stop;
In an engine restart control device for a vehicle equipped with an electric parking brake,
A battery is mounted on the vehicle as a common power source used by the electric motor, the starter motor, and electrical components other than the two motors,
The engine restart control means is configured such that when the engine restart request intervenes while the engine is automatically stopped and the electric parking brake is in the transition from the operation state to the release state, the release state of the electric parking brake is changed from the start of release. Engine restart is prohibited when the first section is in the middle of release, and engine restart is permitted when the release transition state of the electric parking brake is in the second section from the middle of release to the end of release. An engine restart control device for vehicles equipped with an electric parking brake. In the engine restart control device for an electric parking brake-equipped vehicle according to claim 1,
When the electric parking brake is shifted from the operation state to the release state, the electric motor decreases after the current value increases from the start of the release to the middle of the release and maintains the reduced current value from the middle of the release to the end of the release. Shows current waveform characteristics,
The engine restart control means sets the first section as the current of the electric motor when the current value of the electric motor that suppresses an instantaneous drop in battery voltage during simultaneous operation of the starter motor and the electric motor is used as a threshold value. An engine restart control device for a vehicle equipped with an electric parking brake, wherein a value is set in a section higher than the threshold, and the second section is set in a section in which the current value of the electric motor is lower than the threshold. In the engine restart control device for an electric parking brake-equipped vehicle according to claim 1 or 2,
Motor consumption current detection means for detecting consumption current of the electric motor is provided,
The engine restart control means is configured such that the detected current consumption of the electric motor is a predetermined value when an engine restart request intervenes while the engine is automatically stopped and the electric parking brake is being shifted from the operating state to the releasing state. An engine restart control device for a vehicle equipped with an electric parking brake, wherein engine restart is prohibited as described above, and engine restart is permitted when the detected current consumption of the electric motor falls below a predetermined value. In the engine restart control device for an electric parking brake-equipped vehicle according to claim 1 or 2,
The engine restart control means monitors the duration of the release operation from the start of the release operation of the electric parking brake during the automatic engine stop, and restarts the engine during the transition from the operation state to the release state. An electric parking brake characterized in that when a request intervenes, engine restart is prohibited if the release operation duration is less than a predetermined value, and engine restart is allowed if the release operation duration exceeds a predetermined value. Engine restart control device for onboard vehicle. In the engine restart control device for an electric parking brake-equipped vehicle according to claim 1 or 2,
An actuator position detecting means for detecting an actuator position by the operation of the electric motor of the electric parking brake;
The engine restart control means is configured such that the engine position of the electric parking brake is less than or equal to a predetermined value when an engine restart request intervenes while the engine is automatically stopped and the electric parking brake is transitioning from the operating state to the releasing state. An engine restart control device for a vehicle equipped with an electric parking brake, wherein engine restart is prohibited if there is, and engine restart is permitted when the actuator position of the electric parking brake exceeds a predetermined value.