JP2014105661A - Idle stop and start vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an idle stop and start vehicle for saving fuel consumption by automatically stopping an engine by cancelling ban of automatic stopping when a driver executes an operation indicating an intension to park the vehicle after backward driving such as parking of the vehicle.SOLUTION: A vehicle for automatically starting an engine when a predetermined starting condition is satisfied after the engine is automatically stopped when a predetermined stopping condition is satisfied comprises: an engine automatic stop banning control part 53b for banning automatic stop of the engine when the vehicle is stopped while a shift stage of a transmission mounted to the vehicle is in an R-range; and an engine automatic stop banning cancellation control part 53c for operating the shift stage from the R-range to an N-range, and cancelling the banning of automatic stop when a parking brake switch is turned on.

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.
As a starting condition for automatically starting the engine, a brake operation is set in advance.

When the vehicle is turned in the garage or switched on the road (repeatedly moving forward and backward), the driving operation becomes complicated if the engine stops every time the brake is operated. When the shift range is set to the reverse range, the engine stop is prohibited.
However, in garage entry or the like, the engine cannot be automatically stopped even when the transmission is operated to the neutral range after parking in the reverse range and parked.

  Patent Document 1 also discloses a means for automatically stopping the engine after the transmission is in the neutral range, the vehicle speed is 0 (zero), the engine is idling, and the clutch is engaged, and after the automatic stop. In an automatic engine stop / start device having means for automatically starting an engine by operating a clutch pedal, the transmission gear stage travels in the D range or the R range, and is neutral without passing through another shift range. There is a technical disclosure that prohibits the automatic stop of the engine when operated to the range.

JP 09-68064 A

The technique disclosed in Patent Document 1 is to automatically stop the engine when the transmission gear is operated in the neutral range without passing through other gear ranges after traveling at the position of the D range or R range. This prohibits the waste of repeating the restart of the engine while the vehicle is moving little by little by advancing and retreating in a narrow place.
However, in the case of garage entry that repeatedly moves backward and forward in small increments, the engine does not stop even when attempting to park with the shift speed set to the N range, and there is a problem that wasteful fuel is consumed.

  In order to solve the above-described problems, in the present invention, when the driver performs an operation indicating the intention of parking after a reverse operation such as entering a garage, the automatic stop prohibition is canceled and the engine The purpose is to provide an idle stop & start vehicle aimed at saving fuel consumption by implementing a stop.

In order to solve the above-described problems, in the present invention, an engine that is a motive power source for a vehicle is automatically stopped when a predetermined stop condition is satisfied, and then the engine is automatically started when a predetermined start condition is satisfied. In an idle stop & start vehicle equipped with idle stop & start control means,
An engine automatic stop prohibiting means for prohibiting the automatic stop of the engine when a shift stage of a transmission mounted on the vehicle stops in a reverse range;
An engine automatic stop prohibition canceling means for canceling the engine automatic stop prohibition by the engine automatic stop prohibiting means when the shift stage is operated from the reverse range to the neutral position and the parking brake is turned on. It can provide a featured idle stop & start vehicle.

  According to this invention, when the transmission stops in the reverse range, automatic engine stop is prohibited, and when the transmission moves from the reverse range to the neutral range and the parking brake is turned on, the engine is automatically Since the prohibition of the stop is released, the automatic stop of the engine is prohibited when the vehicle turns, etc., and the intention to stop the vehicle when the transmission is in the neutral range and the parking brake is turned on. By determining that the driver is present and canceling the prohibition of the automatic stop of the engine, the handling of the vehicle is improved, and a fuel saving effect is obtained by automatically stopping the engine when there is a parking intention.

  Preferably, in the present invention, when the brake pedal is depressed in a state in which the engine automatic stop prohibition is canceled by the engine automatic stop prohibition canceling means, the engine automatic stop means that performs the engine automatic stop is performed. It is good to have.

  By adopting such a structure, when the gear position of the transmission is in the neutral range, the parking brake is ON, and the brake pedal is depressed, it is determined that the driver does not intend to start the vehicle, and the engine is stopped. Can save fuel.

  Preferably, in the present invention, the engine automatic stop prohibition releasing means continues the engine automatic stop prohibition when the transmission is shifted from the reverse range to the drive range, and the vehicle starts when the vehicle starts. It is recommended to cancel the automatic stop prohibition.

  By adopting such a structure, when the shift range of the transmission is in the drive range, it is determined that at least the driver intends to start the vehicle, and the vehicle is operated by prohibiting the automatic stop of the engine. Time complexity can be reduced.

  To reduce fuel consumption by canceling the automatic stop prohibition and automatically stopping the engine when the driver performs an operation indicating the intention of parking after the vehicle has been driven backwards, such as in a garage. Idol stop & start vehicle 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. The flowchart of the routing of automatic stop or automatic start when the vehicle of the present invention travels backward is shown. The operation | movement flowchart of a control apparatus 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

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 is executed to automatically start the engine 1.
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 (the brake switch 72 is turned on), the vehicle stop (the vehicle speed is zero), etc. 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, there are various cases in the operation status of the vehicle, and even if the stop condition of the engine 1 is appropriately set, the engine 1 may be automatically stopped in an unnecessary situation.
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 that automatically stops the engine 1 and an engine automatic start control unit 62 that automatically starts the engine 1 based on the control content of 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 engine automatic stop condition determining unit 53 includes an engine automatic stop control unit 53a that performs determination of stop of the engine 1 and engine automatic stop control based on the shift range from the vehicle state detection unit 51 and the shift range confirmation unit 52; Engine automatic stop prohibition control unit 53b, which is an engine automatic stop prohibition unit that performs determination of engine automatic stop prohibition and engine automatic stop prohibition, determination of cancellation of engine automatic stop prohibition, and engine automatic stop prohibition release control And an engine automatic stop prohibition release control unit 53 which is an engine automatic stop prohibition release means for performing the above.
The engine start condition determination unit 54 instructs the engine control device 6 to start the engine 1 when the engine start condition described above is satisfied.

FIG. 3 is a flowchart showing a routine for automatically stopping or automatically starting the engine 1 when the vehicle is driven backward by the control device 7.
Start in step S1. In step S2, the vehicle state detection means 51 determines whether the vehicle is stopped or traveling. Further, the shift range confirmation means 52 confirms whether the change lever 13 is operated to the D range or the N range.
In the case of step S2, it is determined that the D range is intended to travel, and the N range indicates a state in which it cannot be determined whether the vehicle will travel or stop.
Therefore, in the case of the D range or the N range, Yes is selected, the process proceeds to the routing A and normal idle stop & start control is performed.
Therefore, an input signal from the brake switch 77 is input to the engine automatic stop condition determination means 53 by stepping on the brake petal 76 in step S11.
The engine automatic stop control unit 53a of the engine automatic stop condition determining means 53 determines that the driver intends to stop.
Furthermore, the engine automatic stop control unit 53a performs engine automatic stop control and issues an engine stop command to the engine automatic stop control unit 61 of the engine control device 6.
In step S12, the engine automatic stop control unit 61 cuts the fuel of the engine 1 and performs automatic engine stop.
If it is neither the D range nor the N range, No is selected and the process proceeds to step S3.
In the case of the D range or the N range, Yes is selected and the process proceeds to step S11.

In step S3, the shift range confirmation means 52 confirms that the change lever 74 is operated to the R range.
If the change lever 74 is operated to the R range, Yes is selected and the process proceeds to step S4. If it is other than the R range, No is selected, the process proceeds to step S10, and the routing is repeated.

In step S4, the engine automatic stop prohibition control unit 53b determines the prohibition of the engine automatic stop of the idle stop & start control device and performs the automatic stop prohibition control of the engine 1 because the R range operation is performed. .
In step S5, the shift range confirmation unit 52 confirms again whether or not the change lever 74 is operated to the N range.
In step S5, the shift range confirmation means 52 determines whether the change lever 74 is operated from the R range to the N range or whether the change lever 74 is operated from the R range to the D range via the N range. Deciding.
If the change lever 74 is in the N range, it is determined that the vehicle has not started, and the process proceeds to step S6.
If it is determined that the D range is operated from the R range to the N range, the process proceeds to step S8.
In this case, the control device determines that the driver intends to drive the vehicle.

In step S <b> 6, the engine automatic stop prohibition cancel control unit 53 c determines cancellation of the engine 1 stop prohibition based on an input signal transmitted from the parking brake switch 79 by operating the parking brake lever 78.
The operation of the parking brake lever 78 determines that the driver intends to park.
In step S7, the engine automatic stop prohibition cancel control unit 53c performs engine stop prohibition cancel control.
In the state of step S7, normal idle stop & start control is performed, and the routing of A is entered.
By canceling the engine stop prohibition, the engine 1 can be automatically stopped to save fuel.

In step S5, if it is other than the N range, that is, in the D or R range, No is selected and the process proceeds to step S8. In step S8, the vehicle restarts.
When the vehicle transmits, the engine automatic stop prohibition release control unit 53c cancels the engine automatic stop prohibition in order to shift to idle stop & start control.
In step S10, the routing is repeated.

  With such a configuration, when the transmission 3 stops in the R range, the automatic stop of the engine 1 is prohibited, the transmission 3 moves from the R range to the N range, and the parking brake switch 79 is turned on. In such a case, since the prohibition of the automatic stop of the engine 1 is canceled, the automatic stop of the engine 1 is prohibited when the vehicle turns, the transmission 3 is in the N range, and the parking brake 78 is ON. If operated, it is determined that the driver intends to stop the vehicle, and the prohibition of the automatic stop of the engine 1 is canceled, thereby improving the handling of the vehicle and automatically stopping the engine 1 when there is a parking intention. By doing so, a fuel saving effect is obtained.

  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)
2 Clutch device 3 Transmission
DESCRIPTION OF SYMBOLS 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 control part (engine automatic stop means)
53b Engine automatic stop prohibition control section (engine automatic stop prohibition means)
53c Engine automatic stop prohibition release controller (engine automatic stop prohibition release means)
54 Engine Automatic Start Condition Determination Unit 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 (3)

An idle stop & start control means comprising an idle stop & start control means for automatically stopping an engine as a power source for driving the vehicle when a predetermined stop condition is satisfied, and then automatically starting the engine when a predetermined start condition is satisfied. In the starting vehicle,
An engine automatic stop prohibiting means for prohibiting the automatic stop of the engine when a shift stage of a transmission mounted on the vehicle stops in a reverse range;
An engine automatic stop prohibition canceling means for canceling the engine automatic stop prohibition by the engine automatic stop prohibiting means when the shift stage is operated from the reverse range to the neutral position and the parking brake is turned on. Characteristic idle stop & start vehicle.   In the state where the automatic stop prohibition is canceled by the engine automatic stop prohibition canceling means, when the brake pedal is stepped on, the engine automatic stop means for automatically stopping the engine is provided. The idle stop and start vehicle according to claim 1.   The engine automatic stop prohibition releasing means continues the automatic stop prohibition when the transmission is shifted from the reverse range to the drive range, and cancels the automatic stop prohibition when the vehicle starts. The idle stop & start vehicle according to any one of claims 1 and 2.

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