JP2014227912A - Idle stop control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an idle stop control device for performing no restart of an internal combustion engine against the will of an operator.SOLUTION: An idle stop control device 10 sends an engine stop request to an engine controller 20, if a preset automatic stop condition holds on the basis of the information of a sensor of each part of a vehicle 100, thereby to stop an engine 21 automatically. When a preset restart condition then holds, the restart of the engine 21 is not performed if the depression of a brake is detected by a brake oil pressure sensor 12, even in the case where a shift position detected by a shift position sensor 11 is an R range or a P range.

Description

  The present invention relates to an idle stop control device, and more particularly to an idle stop control device that controls automatic stop and restart of an internal combustion engine.

In order to improve fuel efficiency and reduce exhaust gas, the vehicle will stop the internal combustion engine when a preset automatic stop condition is met when stopping at an intersection, etc., and then set a preset restart condition. An idling stop function for restarting the internal combustion engine when the above is established is performed.
Some idling stop functions automatically restart the internal combustion engine based on the shift position and the brake depression operation after the automatic stop.

Patent Document 1 includes an automatic transmission, and when the vehicle stops in a shift position other than the D (drive) range, for example, in an N (neutral) range, the internal combustion engine is automatically stopped if an automatic stop condition is satisfied. A vehicle that prohibits restart of the internal combustion engine triggered by a brake depression operation for a certain period of time has been proposed.
In the idle stop control device described in Patent Document 1, the internal combustion engine is restarted at an incorrect timing by a brake depression operation that repeatedly repeats on / off of the brake and increase / decrease of the brake pedal force performed by the driver when the vehicle is stopped. It is possible to prevent starting.

JP 2012-52471 A

However, in the vehicle idle stop control device described in Patent Document 1, the shift operation from the non-traveling range to the traveling range is performed even during a certain period of time during which the restart of the internal combustion engine is prohibited. Is performed, the internal combustion engine is restarted.
For this reason, when the vehicle is parked by moving forward to the parking section, even if the automatic stop condition is satisfied after the vehicle is stopped and the internal combustion engine is automatically stopped, from the N (neutral) range to P (parking) for parking. When the shift operation is performed to the range, the internal combustion engine is restarted because it passes through the R (reverse) range (traveling range).

This is a problem that, for a driver who wants to turn off the ignition with the internal combustion engine being automatically stopped, the internal combustion engine is restarted unexpectedly.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an idle stop control device that does not restart an internal combustion engine contrary to a driver's intention by prohibiting the restart of the internal combustion engine by a shift operation based on depression of a brake. It is said.

  The first aspect of the present invention is mounted on a vehicle together with an internal combustion engine and a transmission, and automatically stops the internal combustion engine when a preset automatic stop condition is satisfied, and a preset restart condition is satisfied. An idle stop control device for restarting the internal combustion engine, comprising: a shift position detection unit for detecting a shift position of the transmission; and a brake depression detection unit for detecting brake depression of the vehicle, After the automatic stop condition is satisfied and the internal combustion engine is automatically stopped, when the restart condition is satisfied, when the shift position is a preset shift position and the brake depression is detected, The internal combustion engine is not restarted.

As a second aspect of the present invention, it is preferable to set a range excluding the forward travel range and the neutral range as the preset shift position.
According to a third aspect of the present invention, there is provided a tilt angle detection unit that detects the tilt angle of the vehicle, the shift position is a preset shift position, and the brake depression is detected. However, it is preferable to restart the internal combustion engine when the inclination angle is larger than a preset value.

As described above, according to the first aspect, if the brake depression is detected, the restart is not performed even if the restart condition based on the shift position is satisfied. It is possible to prevent restarts against the intention of the driver.
According to said 2nd aspect, if the brake depression is detected, since the restart in the middle of the shift change from a forward drive range or a neutral range to a parking range is not performed, the restart by the shift change at the time of parking Can be prevented.

  According to said 3rd aspect, since the restart is performed even if the brake depression is detected if the inclination angle of the vehicle exceeds a predetermined value, the prohibition of the restart due to the brake depression on the hill is prevented. Can do.

FIG. 1 is a conceptual functional block diagram illustrating an idle stop control device according to a first embodiment of the present invention. FIG. 2 is a flowchart for explaining an example of the processing procedure. FIG. 3 is a diagram illustrating an idle stop control device according to the second embodiment of the present invention, and is a flowchart for explaining an example of the processing procedure.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 are diagrams showing an idle stop control device according to a first embodiment of the present invention.

(First embodiment)
In FIG. 1, a vehicle 100 realizes efficient driving by controlling driving of an engine (internal combustion engine) 21 that is mounted on a vehicle as a driving source for driving by an engine controller 20. It is determined whether an automatic stop condition and a restart condition are satisfied, and an idling stop function is realized by transmitting an engine stop request or an engine restart request to the engine controller 20. The engine controller 20 and the idle stop control device 10 cooperate to perform idling stop control by performing CAN (Controller Area Network) communication.

In addition, the vehicle 100 is selected by a shift lever (not shown) so that an automatic transmission (not shown) automatically switches the gear ratio according to the speed of the vehicle 100, the accelerator opening, the travel range, and the like. Depending on the range, the drive state of the automatic transmission can be changed to a P (parking) range, an R (reverse) range, an N (neutral) range, a D (drive) range, and the like.
The engine controller 20 controls the fuel injector 22 to shut off the fuel supply and stop the engine 21.

The engine controller 20 also supplies power to the starter motor 23 to crank the engine 21 and controls the fuel injector 22 and a spark plug (not shown) to start the engine 21.
The idle stop control device 10 executes a control program stored in advance and performs idling stop control based on setting parameters and detection information of various sensors. Sensors such as a position sensor 11, a brake hydraulic pressure sensor 12, and an inclination angle sensor 13 are used.

The shift position sensor 11 outputs, for example, a 0/1 signal (shift position information) corresponding to the selected position of the shift lever. That is, the shift position sensor 11 constitutes a shift position detection unit.
For example, the brake hydraulic pressure sensor 12 outputs sensor information (voltage signal) in accordance with the brake hydraulic pressure obtained by the brake operation, and the voltage of the sensor information becomes higher as the brake depression amount increases. ing. Whether or not the brake is depressed is determined based on whether or not the voltage of the sensor information is equal to or higher than a predetermined value. That is, the brake hydraulic pressure sensor 12 constitutes a brake depression detection unit.

The presence or absence of depression of the brake may be detected by a brake switch that detects on / off of the brake pedal operation and a brake pedal stroke sensor that detects the degree of depression of the brake pedal.
The inclination angle sensor 13 is configured by, for example, a gyroscope or an acceleration sensor, and outputs sensor information (voltage signal) corresponding to an angle of the traveling direction of the vehicle 100 with respect to the horizontal plane. If it is larger than the reference value (value in the horizontal plane), it will be an uphill, and if it is smaller than the reference value, it will be a downhill. On the uphill, the greater the sensor information voltage, the greater the tilt angle. Is getting bigger. That is, the inclination angle sensor 13 constitutes an inclination angle detection unit.

When the depression of the brake is detected, the idle stop control device 10 prohibits the restart of the engine 21 even if the restart condition by the shift position is satisfied.
Specifically, the idle stop control device 10 executes a control process (control method) shown in the flowchart of FIG. 2, and when a restart condition is established after the engine 21 is automatically stopped, Restart is prohibited when brake depression is detected.

Here, the shift position where the restart is prohibited by depressing the brake can be set in advance, and the R (reverse) range and the P (parking) range excluding the D (drive) range and the N (neutral) range can be set. It is preferable to set.
Further, nothing should be set if prohibition of restart is not performed, and all shift positions may be set if restart is prohibited at all shift positions.

  As shown in FIG. 2, the idle stop control device 10 first refers to information from various sensors to determine whether or not an engine automatic stop condition such as a vehicle stop has been satisfied (step S11). . In step S11, if the engine automatic stop condition is not satisfied, the process of step S11 is repeatedly executed to wait for the engine automatic stop condition to be satisfied.

  In step S11, when the idle stop control device 10 determines that the engine automatic stop condition is satisfied, it transmits an engine stop request to the engine controller 20 to automatically stop the engine 21 (step S12). When the engine controller 20 receives the engine stop request, the engine controller 20 stops the fuel supply by the fuel injector 22 and automatically stops the engine 21.

  Next, the idle stop control device 10 refers to information from various sensors. For example, when the shift position information is outside the N (neutral) range (travel range), the brake depression is released, and the accelerator is depressed. It is determined whether or not an engine restart condition such as is satisfied (step S13). In step S13, if the engine restart condition is not satisfied, the process of step S13 is repeatedly executed to wait for the engine restart condition to be satisfied.

  In step S13, when the idle stop control device 10 determines that the engine restart condition is satisfied, the shift position information acquired from the shift position sensor 11 is the R (reverse) range or P ( It is determined whether it is in the parking range (step S14).

  In step S14, when the idle stop control device 10 determines that the shift position information is not in the R range or the P range, it transmits an engine restart request to the engine controller 20 to restart the engine (step S16). After the process is finished, the process is repeated from step S11. When the engine controller 20 receives the engine restart request, the engine controller 20 controls the fuel injector 22, the starter motor 23 and the like to restart the engine 21.

  In step S14, when the idle stop control device 10 determines that the shift position information is the R range or the P range, the brake is depressed by the sensor information (brake depression amount) acquired from the brake hydraulic pressure sensor 12. It is determined whether or not (step S15).

  In step S15, when the idle stop control device 10 determines that the brake is not depressed because the brake depression amount is less than the predetermined value, the idle stop control device 10 transmits an engine restart request to the engine controller 20 to restart the engine. (Step S16), and once this process is completed, the process is repeated from Step S11. When the engine controller 20 receives the engine restart request, the engine controller 20 controls the fuel injector 22, the starter motor 23 and the like to restart the engine 21.

In step S15, when the idle stop control device 10 determines that the brake depression amount is equal to or greater than a predetermined value and the brake is depressed, the engine 21 is not restarted, and the process returns to step S13 to restart the engine. Wait for the condition to hold.
Therefore, after the engine is automatically stopped at the idling stop, if a brake depression is detected, restart at the preset shift position is prohibited, so the engine is contrary to the driver's intention due to the shift position during the shift change. Can be prevented from restarting.

  In this embodiment, after the restart condition is satisfied, the shift position and the brake depression are determined. However, the shift position determination and the brake depression determination included in the restart condition are used. May be.

(Second Embodiment)
Next, FIG. 3 is a diagram showing an idle stop control device for a vehicle according to a second embodiment of the present invention. Here, since the present embodiment is configured in substantially the same manner as the above-described embodiment, the same reference numerals are given to the same configurations using the drawings, and the characteristic portions will be described.

When the inclination angle of the vehicle 100 acquired from the inclination angle sensor 13 exceeds a predetermined value, the idle stop control device 10 in FIG. 1 determines that the brake is depressed on a hill and detects the depression of the brake. However, the engine 21 is restarted.
Here, as the predetermined value for the inclination angle determination, a small inclination angle may be used if there are many places where parking is normally performed, and a large inclination angle is required when parking on a hill is also performed with considerable frequency. It is preferable to set in advance.

Specifically, the idle stop control device 10 executes the control processing (control method) shown in the flowchart of FIG. 3 to shift the shift position information and the brake when the restart condition is satisfied after the engine 21 is automatically stopped. Even if it is determined that the restart is prohibited, the restart is performed if the inclination angle of the vehicle 100 exceeds a predetermined value.
As described in the flowchart of FIG. 2, the idle stop control device 10 first transmits an engine stop request to the engine controller 20 to automatically stop the engine 21 when the automatic stop condition is satisfied (step S11). (Step S12) Waits until the engine restart condition is satisfied (Step S13).

  When the engine restart condition is satisfied, the idle stop control device 10 determines that the shift position information is the R range or the P range (step S14), the brake depression amount is equal to or greater than a predetermined value, and the brake is depressed. (Step S15), it is next determined whether or not the inclination angle of the vehicle 100 is equal to or smaller than a predetermined value (step S21). Here, the inclination angle includes an elevation angle (uphill) and a depression angle (downhill), and in either case, the inclination angle is represented by an angle within a range of 0 to 90 degrees from the horizontal plane.

In step S21, when it is determined that the inclination angle of the vehicle 100 is larger than the predetermined value, the idle stop control device 10 transmits an engine restart request to the engine controller 20 to restart the engine (step S16). After this process is finished, the process is repeated from step S11. When the engine controller 20 receives the engine restart request, the engine controller 20 controls the fuel injector 22, the starter motor 23 and the like to restart the engine 21.
In Step S21, when it is determined that the inclination angle of the vehicle 100 is equal to or less than the predetermined value, the idle stop control device 10 does not restart the engine 21 and returns to Step S13 to satisfy the engine restart condition. Wait for

Therefore, after the engine 21 is automatically stopped, even if the depression of the brake is detected at a preset shift position, the engine 21 is restarted if the inclination angle of the vehicle 100 exceeds a predetermined value. Therefore, the engine 21 can be restarted when the brake is depressed on a slope while preventing the engine from being restarted against the driver's intention due to the shift position during the shift change.
In the present embodiment, the upper limit value of the inclination angle of the vehicle 100 that prohibits the restart of the engine 21 is set to the same value for the elevation angle (uphill) and the depression angle (downhill). May be.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

DESCRIPTION OF SYMBOLS 10 Idle stop control apparatus 11 Shift position sensor 12 Brake hydraulic pressure sensor 13 Inclination angle sensor 20 Engine controller 21 Engine 22 Fuel injector 23 Starter motor

Claims (3)

Mounted in a vehicle together with an internal combustion engine and a transmission, the internal combustion engine is automatically stopped when a preset automatic stop condition is satisfied, and the internal combustion engine is restarted when a preset restart condition is satisfied An idle stop control device,
A shift position detector for detecting a shift position of the transmission;
A brake depression detection unit for detecting the brake depression of the vehicle,
The shift position is a preset shift position and the brake depression is detected when the restart condition is satisfied after the automatic stop condition is satisfied and the internal combustion engine is automatically stopped. An idle stop control device characterized by not restarting the internal combustion engine.   The idle stop control device according to claim 1, wherein a range excluding a forward travel range and a neutral range is set as the preset shift position. An inclination angle detection unit for detecting an inclination angle of the vehicle;
Even when the shift position is a preset shift position and the brake depression is detected, the internal combustion engine is restarted if the inclination angle is larger than a preset value. The automatic stop control device for a vehicle according to claim 1 or 2.

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