JP2014105659A - Idle stop and start vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an idle stop and start vehicle for reducing fatigue of a driver by preventing re-start of an engine even when a brake pedal operation is cancelled after the engine is automatically stopped during stopping by a traffic signal and the like.SOLUTION: An idle stop and start vehicle comprises: an engine automatic stop holding part for maintaining stop of an engine even when a brake pedal is turned off after the brake pedal is turned on to automatically stop the engine while a shift stage of a transmission is in an N-range; and an engine automatic stop holding cancellation part for restarting the engine by cancelling the holding of the stop of the engine held by the engine automatic stop holding part with a holding cancellation operation.

Description

  The present invention relates to an idle stop and start vehicle that improves fuel efficiency and reduces the complexity of a driver's operation by executing automatic stop / restart of an engine mounted on the vehicle.

In recent years, from the viewpoint of environmental protection and fuel economy saving, when a vehicle is temporarily stopped due to traffic signals at intersections, waiting for vehicles to stop at level crossings, etc., the engine of the vehicle is stopped, and at the time of the subsequent start, An idle stop & start device that restarts an engine by a driver performing a start operation has been put into practical use.
For example, as conditions for automatically stopping the engine, conditions such as stopping the accelerator pedal operation, braking operation, vehicle stop, etc. are set in advance, and all these conditions are satisfied and continued for a certain period of time. When it is done, the engine is automatically stopped.
In addition, as a starting condition for automatically starting the engine, stop of the brake operation is set in advance.

However, it is necessary to depress and maintain the brake pedal while continuing the engine stop while the vehicle is stopped at the traffic signal at the intersection and at the railroad crossing.
Continued depression of the brake pedal also contributes to increased driver fatigue.
Patent Document 1 is known for an idle stop & start control vehicle.
According to Patent Document 1, when there is a brake operation, there is no vehicle speed, and the shift position is in the drive range, the engine is stopped, the brake operation is released while the engine is stopped, and when the shift position is in the drive range, In the idle stop & start device that restarts the engine, a technical disclosure is made to restart the engine when the shift position is shifted from the drive range to the neutral range while the brake operation is being performed while the engine is stopped.

JP 2012-87730 A

However, the technique disclosed in Patent Document 1 restarts the engine when the shift position is shifted from the drive range to the neutral range while the brake operation is performed while the engine is stopped. It is a device that continues the brake operation.
Therefore, it is necessary for the driver to keep stepping on the brake pedal until the engine is restarted, which causes a problem of increasing driver fatigue.

  In order to solve the above-described problems, in the present invention, when the engine stops automatically when the engine stops, even if the brake pedal operation is released, the engine does not restart, The purpose is to provide an idle stop & start vehicle that will reduce the amount of traffic.

In order to solve the above-described problems, in the present invention, when a predetermined stop condition is satisfied, the engine that is a power source for driving the vehicle is automatically stopped, and then, when the predetermined start condition is satisfied, the engine is automatically In an idle stop & start vehicle equipped with an idle stop & start control means for starting,
When the shift stage of the transmission mounted on the vehicle is in the neutral position, the brake pedal of the vehicle is turned on,
After the engine is automatically stopped, the engine automatic stop holding means for maintaining the engine stop even if the brake pedal is turned off, and the engine stop holding held by the engine automatic stop holding means are held. It is possible to provide an idle stop & start vehicle characterized by comprising an engine automatic stop hold releasing means that is released by a release operation and restarts the engine.

  According to this invention, after the engine stops, even if the brake pedal is turned OFF, the engine continues to be stopped, and the idle stop state can be maintained with the brake pedal released (OFF), and the driving operation is reduced (the brake pedal is depressed). It is possible to cancel the driver's fatigue state, and the driver's fatigue can be reduced.

  In the present invention, preferably, the holding release operation may be performed by turning on the brake pedal again.

  Since the engine is restarted by depressing the brake pedal again after the engine stops, it is easy to operate and there is no sense of incongruity with the conventional idle stop & start device when the engine is restarted. Easy to handle.

  In the present invention, it is preferable that the holding release operation is performed by operating the parking brake of the vehicle from ON to OFF.

  With such a structure, even if the parking brake is released and the engine is restarted, the driver can easily prepare the running posture.

  In the present invention, it is preferable that the holding release operation is performed by operating the shift position of the transmission from a neutral position to a travel position or a reverse position.

  By adopting such a structure, the engine is started by shifting the shift stage of the transmission based on the driver's intention to travel. You can be careful enough.

  When the engine stops, even if the brake pedal operation is canceled when the engine stops, the engine does not restart and it is not necessary to continue the depression of the brake pedal. Mitigating idle stop and start vehicles can be provided.

The schematic block diagram of the idle stop & start apparatus of this invention is shown. The schematic block diagram of the control apparatus of the idle stop & start apparatus of this invention is shown. After the vehicle of this invention stops, the flowchart of the restarting routing is shown.

  Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this example are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.

FIG. 1 shows a schematic configuration diagram of an idle stop & start device of the present invention.
An engine (abbreviated as E / G in the attached diagram) 1 is mounted as a power source for vehicles. The power of the engine 1 is transmitted to an automatic transmission 3 (hereinafter abbreviated as “transmission 3”) via a clutch device 2 mounted on the downstream side of the power system of the engine 1.
The clutch device 2 is a device that transmits or interrupts the power of the engine 1 to the automatic transmission 3.

The transmission 3 is provided with a gear shift unit 31 for switching the gear position.
The gear shift unit 31 incorporates a plurality of air cylinders that operate shift forks corresponding to each gear position in the transmission 3 and a plurality of electromagnetic valves that operate each air cylinder.
The gear shift unit 31 is connected to the air tank 11 through the air passage 12, and compressed air from the air tank 11 is supplied to the corresponding air cylinder in response to opening and closing of each solenoid valve, and the air cylinder is operated. Switch the corresponding shift fork. In the transmission 3, the gear position is switched according to the shift fork switching operation.
Thus, in the gear shift unit 31, the air cylinder operates according to the opening / closing of the electromagnetic valve. The transmission 3 can be automatically shifted by an air cylinder.

A control device 7 that comprehensively controls the engine 1, the clutch device 2, and the transmission 3 is disposed in the cab.
On the input side of the control unit (ECU) 7, an engine speed sensor 22 that detects the rotational speed Ne of the engine 1, a lever position sensor 75 that detects a switching range of a change lever 74 provided in the driver's seat, A gear position sensor 32 that detects the speed range of the machine 3, an accelerator sensor 73 that detects the operation of the accelerator pedal 72, and an output shaft 34 of the transmission 3, and detects the vehicle speed from the rotational speed Nt of the output shaft 34. Signals from the vehicle speed sensor 33, a brake switch 77 that detects the operation of the brake pedal 76, and a parking brake switch 79 that detects the operation of the parking brake lever 78 that operates the parking brake of the vehicle are input.

Further, from the output side of the control unit (ECU) 7, there are a number of signals for controlling the solenoid valves of the gear shift unit 31, the operation stop lamp 71 for idle stop and start control provided in the driver's seat, and the engine 1. Is output.
In the present embodiment, the engine control device is included in the control device (ECU) 7, but a control device dedicated to engine control is provided separately from the control device 7 so as to cooperate with the control device 7. It may be.

When the lever position sensor 75 detects that the change lever 74 is switched to the travel range (hereinafter referred to as “D range”), the control device 7 executes the automatic shift mode, and uses the accelerator operation amount and the vehicle speed sensor 28. Based on the detected vehicle speed, a target shift speed is calculated from a shift map (not shown). Then, a predetermined solenoid valve of the gear shift unit 31 is opened / closed while the clutch device 2 is connected / disconnected, and the corresponding shift fork is operated by the air cylinder to switch the shift stage to the target shift stage. The vehicle can be driven at
The gear position sensor 32 is a device that confirms that the gear position in the transmission 3 has been changed as instructed.

Furthermore, the control device 7 automatically stops the engine 1 when the vehicle is temporarily stopped and a predetermined engine stop condition is satisfied while waiting for a traffic signal. Thereafter, when a predetermined engine start condition is satisfied, idle stop & start control for automatically starting the engine 1 is executed.
Since the engine automatic stop condition and the automatic start condition are disclosed in various documents, only the outline will be described.
For example, as the engine automatic stop condition, the stop of the accelerator operation, the operation of the brake pedal 76 (the brake switch 77 is ON), the vehicle stop (the vehicle speed is zero), and the like are set in advance. When a state in which all these conditions are satisfied continues for a preset time, the control device 7 regards that the automatic stop condition of the engine 1 is satisfied, stops the fuel injection of the engine 1 and automatically Stop.

Further, as an engine automatic start condition, stop of the brake operation (the brake switch 72 is OFF) is used. When this condition is satisfied, the control device 7 determines that the automatic start condition is satisfied, and drives the starter motor (not shown) to automatically start the engine 1 so that the vehicle can start.
It should be noted that the automatic stop condition and automatic start condition of the engine 1 are examples, and are not limited to these and can be arbitrarily changed.

By the way, according to the present invention, when a predetermined condition for stopping the engine 1 is established when the vehicle is at an intersection or the like, the engine 1 is stopped even if the brake pedal 76 is released after the engine 1 is stopped. Technology to maintain.
An example of the correspondence is incorporated in the control device 7 in the present embodiment.
As shown in FIG. 2, the control device 7 includes the idle stop & start control device 5 and the engine control device 6 as described above.

The idle stop & start control device 5 includes a vehicle state detection unit 51, a transmission shift range confirmation unit 52, an engine automatic stop condition determination unit 53, and an engine automatic start condition determination unit 54. ing.
On the other hand, the engine control device 6 includes an engine automatic stop control unit 61 for automatically stopping the engine 1 and an engine automatic start control unit 62 for automatically starting the engine 1 based on a control command from the idle stop & start control device 5. It has.

The vehicle state detection means 51 of the idle stop & start control device 5 determines whether the vehicle is running or stopped by the vehicle speed sensor 33.
The shift range confirmation means 52 detects a reverse range (hereinafter referred to as “R range”), a neutral range (hereinafter referred to as “N range”), a D range, and the like by a signal input from the lever position sensor 75 by operating the change lever 74.
The shift range confirmation means 52 shares a signal for operating the gear shift unit 31 of the transmission 3.

  The automatic engine stop condition determination means 53 is information that is received from the vehicle state detection means 51 and the shift range confirmation means 52, an input signal from the brake switch 77 that confirms the depression of the brake pedal 76, and a parking that confirms the operation of the parking brake lever 78. Based on the input signal from the brake switch 79 and the input signal from the accelerator sensor 73 that confirms the depression of the accelerator 72, the engine automatic stop is determined when the set input condition is satisfied.

Furthermore, the engine automatic stop condition determining means 53 has an engine automatic stop holding portion 53a which is an engine automatic stop holding means.
The engine automatic stop holding unit 53a depresses the brake pedal 76 when the speed of the transmission 3 is in the N range and the engine 1 automatically stops when the brake pedal 76 is depressed (brake pedal ON operation). Even if it cancels, the stop of the engine 1 is continued.

  Similar to the engine automatic stop condition determining means 53, the engine automatic start condition determining means 54 is information from the vehicle state detecting means 51 and the shift range confirming means 52, the depression of the brake pedal 76, the operation confirmation of the parking brake switch 79, Based on confirmation of the depression of the accelerator sensor 73, the engine automatic start is determined when the set input condition is satisfied.

Further, the engine automatic start condition determining means 54 has an engine automatic stop hold releasing unit 54a which is an engine automatic stop hold releasing means.
The engine automatic stop holding release unit 54a performs the engine automatic stop holding performed by the engine automatic stop holding unit 53a by depressing the brake pedal 76 or releasing the parking brake lever 78 (operating the parking brake lever OFF). Alternatively, it is released by operating the change lever 74 to the R range or D range, and commands the engine automatic start control unit 62 to start the engine 1.

When it is determined that the engine automatic stop condition is satisfied, the engine automatic stop condition determining unit 53 issues an engine automatic stop command to the engine control device 6. The engine control device 6 performs control to stop the engine 1 by shutting off the fuel supply of the engine 1 by the engine automatic stop control unit 61.
On the other hand, when the engine start condition determining unit 54 determines that the engine start condition is satisfied, the engine start condition determining unit 54 issues an engine automatic start command to the engine control device 6. The engine control device 6 controls the engine 1 to start by driving the starter motor of the engine 1 by the engine automatic start control unit 61.

FIG. 3 shows a flowchart of the engine restart routing executed by the control device 7 after the vehicle of the present invention stops.
FIG. 3 shows a flow from a state where the vehicle is stopped and the engine 1 is stopped.
Start in step S1. In step S2, the brake pedal OFF flag = 0 and the parking brake lever ON flag = 0.
That is, the brake pedal OFF flag = 0 indicates that the brake pedal 76 is depressed by the engine automatic stop condition determination means 53.
In this state, the engine stop condition is established by the engine automatic stop condition determination means 53.

In step S3, it is determined whether the engine 1 has been stopped by idle stop & start control.
When the engine 1 is stopped, Yes is selected and the process proceeds to step S4.
On the other hand, if the driver operates the shift lever 74 outside the N range before the engine 1 is stopped, the control device determines that the vehicle is traveling, stops the stop of the engine 1, selects No, and proceeds to step S15. Advance and repeat this control.
In step S4, the shift range confirmation means 52 looks at the shift stage status of the shift lever 74 to determine whether the engine 1 has stopped with the shift lever 74 in the N range position.

When this step S4 Yes is selected, the engine automatic stop holding unit 53 is activated to hold the engine stop.
When the shift lever 74 is in the N range position, the control device determines that the driver does not intend to start the vehicle. In that case, select Yes and go to step S5.
On the other hand, if the engine is stopped but operated outside the N range, the process proceeds to step S15 and this control is repeated.

In step S5, it is determined whether the brake pedal 76 is depressed (ON operation) or not depressed (OFF operation).
If the brake pedal 76 is not depressed (OFF operation), “Yes” is selected, and the brake OFF flag = 1 is set in step S6, and the process proceeds to step S7.
If the brake pedal 76 is depressed (ON operation), No is selected, the brake OFF flag is set to 0 in step S13, and the process proceeds to step S7.
In this state, the engine 1 is stopped regardless of whether the brake pedal 76 is ON or OFF.

In step S7, it is determined whether the change lever 74 is operated outside the N range.
When the change lever 74 is operated outside the N range, the control device 7 determines that the driver intends to start the vehicle, and proceeds to step S12. The engine automatic start condition determining means 54 determines that the engine start condition is satisfied.
When selecting Yes in step S7, the engine automatic stop hold releasing unit 54a releases the engine stop hold.

The engine automatic start condition determination means 54 transmits an engine start command to the engine automatic start control unit 62, and the engine automatic start control unit 62 performs control of the engine automatic start.
In this case, the engine automatic start condition is that the change lever 74 is in a gear position other than the N range.
In step S7, when the change lever 74 is in the N range, the control device 7 determines that the driver does not intend to start the vehicle, selects No, and proceeds to step S8. At this time, the engine 1 continues to be stopped.

In step S8, the operating state of the parking brake lever 78 is detected.
If the parking brake lever 78 is turned on, Yes is selected and the process proceeds to step S14. In step S14, the parking brake lever ON flag = 1 is set.
When the parking brake lever ON flag = 1 is set, the flow B is entered and the process returns to step S7 again.
In step S7, since the change lever 7 is in the N range, No is selected and the process proceeds to step S8.

At that time, if the parking brake lever is operated from the ON to the OFF state for starting, Step 8 is determined No and the process proceeds to Step 9.
In step S9, it is determined whether the parking brake lever ON flag = 1.
However, since the parking brake lever ON flag is 1 in step S14, Yes is selected and the process proceeds to step S12.
The engine automatic start condition determining means 54 determines that the conditions for engine automatic start are satisfied.
When selecting Yes in step S9, the engine automatic stop / hold release unit 54a releases the engine stop hold.
The engine automatic start condition determining means 54 transmits an engine start command to the engine automatic start control unit 62, and the engine automatic start control unit 62 controls the engine automatic start.
In this case, the engine automatic start condition is that the parking brake lever 78 is switched from ON to OFF.

On the other hand, when the parking brake lever is kept OFF after the engine is automatically stopped, No is selected for the parking brake lever ON flag = 1 in step S9, and the process proceeds to step S10.
In step S10, it is determined whether the brake pedal OFF flag = 1.
That is, in step S6, since the brake pedal OFF flag = 1, Yes is selected and the process proceeds to step S11.
In step S11, if the brake pedal 76 is depressed to prepare for starting, etc., Yes is selected and the process proceeds to step S12.
The engine automatic start condition determining means 54 determines that the conditions for engine automatic start are satisfied.

When selecting Yes in step S11, the engine automatic stop hold releasing unit 54a releases the engine stop hold.
The engine automatic start condition determining means 54 issues an engine start command to the engine automatic start control unit 62, and the engine automatic start control unit 62 performs control of the engine automatic start.
In this case, the engine automatic start condition is a brake pedal ON operation (re-depression).

In step S10, No is selected, that is, because brake pedal OFF = 0 in step S13, the brake pedal 76 continues to be depressed, and the restart condition of the engine 1 is not satisfied.
Accordingly, the flow proceeds to the A flow, the process returns to step S5, and the engine 1 is kept stopped.
Furthermore, No is selected in step S11. That is, the state where the brake pedal 76 is not depressed is continued, and the restart condition of the engine 1 is not satisfied.
Accordingly, the flow proceeds to the B flow, and the engine 1 is kept stopped.

With such a configuration, after the engine 1 is stopped, the brake pedal 76 is depressed again to restart the engine 1, so that the idle stop state can be achieved with the brake pedal released (OFF). Can be maintained, driving operation can be reduced (the brake pedal can be continuously released), and driver fatigue can be reduced.
Even if the parking brake is released, even if the engine is restarted by depressing the brake pedal, the vehicle does not run suddenly, so safety can be ensured.
Furthermore, by starting the engine by shifting the shift stage of the transmission based on the driver's intention to travel, it is the same as normal vehicle start, there is no sense of incongruity in driving operation, and the driver's attention to the surroundings is sufficient You can take care and get the effect of driving safely.

  By performing automatic stop / automatic start of the engine mounted on the idle stop & start vehicle, the fuel consumption can be improved and the apparatus can be used for a device that reduces the complexity of the operation of the driver.

1 Engine (E / G)
DESCRIPTION OF SYMBOLS 2 Clutch apparatus 3 Transmission 5 Idle stop & start control apparatus 6 Engine control apparatus 7 Control apparatus 31 Gear shift unit 51 Vehicle state detection means 52 Shift range confirmation means 53 Engine automatic stop condition determination means 53a Engine automatic stop holding part (engine automatic stop holding part) Holding means)
54 Engine automatic start condition determining means 54a Engine automatic stop hold releasing part (Engine automatic stop hold releasing means)
61 Engine automatic stop control unit 62 Engine automatic start control unit 73 Acceleration sensor 75 Lever position sensor 77 Brake switch 79 Parking brake switch (parking brake)

Claims (4)

An idle stop equipped with an idle stop & start control means for automatically stopping an engine as a driving power source for a vehicle when a predetermined stop condition is satisfied, and then automatically starting the engine when a predetermined start condition is satisfied & Start vehicle
After the gear stage of the transmission mounted on the vehicle is in the neutral position, the engine is stopped even if the brake pedal is turned off after the brake pedal is turned on to automatically stop the engine. An engine automatic stop holding means for maintaining, and an engine automatic stop holding release means for releasing the engine stop holding held by the engine automatic stop holding means by a holding release operation and restarting the engine. An idle stop and start vehicle characterized by   2. The idle stop and start vehicle according to claim 1, wherein the holding release operation turns on the brake pedal again.   2. The idle stop and start vehicle according to claim 1, wherein the holding release operation is performed by operating a parking brake of the vehicle from ON to OFF.   2. The idle stop and start vehicle according to claim 1, wherein in the holding release operation, the shift position of the transmission is operated from a neutral position to a travel position or a reverse position.

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