KR20140075175A - Isg controlling method for automatic manual transmission mounted vehicle on downhill - Google Patents

Abstract

The present invention relates to an idle preventing device and, more specifically, to a method for controlling the Idle Stop & Go (ISG) of an automatic manual transmission mounted vehicle on a downhill road, capable of improving fuel rate when driving by improving ISG logic which automatically stops an engine in an idle state when a vehicle stops and restarts the engine under predetermined conditions. The present invention provides a method for controlling the ISG of the automatic manual transmission mounted vehicle on a downhill road, which includes a downshift step of downshifting a gear when the vehicle reduces speed; a clutch release step of releasing the connection of the clutch when the vehicle stops; an off step of turning off the ignition; a neutral step of recognizing a gear position as a neutral state; a coasting drive step of coasting when the vehicle starts on a downhill road; a gear setting step of recognizing the gear position as a preset state; a clutch connection step of connecting a clutch; and a starting step of turning on the ignition.

Description

[0001] ISG CONTROLLING METHOD FOR AUTOMATIC MANUAL TRANSMISSION MOUNTED VEHICLE ON DOWNHILL [0002]

More particularly, the present invention relates to an idling prevention apparatus, and more particularly, to an idling prevention apparatus capable of automatically stopping an idling engine when the vehicle is stopped and improving the ISG logic in which a restart is performed under a predetermined condition, Downward ISG control method.

In recent years, there has been a tendency that a device capable of improving various fuel economy is added to an internal combustion engine vehicle in accordance with a demand for prevention of environmental pollution and reduction of fuel.

2. Description of the Related Art Recently, the application of an idle stop and go (ISG) device, which is one of the devices for improving the fuel efficiency of a vehicle, , The temperature of the cooling water, the operation state of the air conditioner, or the running state of the gradient section, and stops the engine at idle, thereby improving the fuel efficiency.

Such an ISG device may be configured such that when the vehicle is stopped while the vehicle is running, the engine is not idled, and the engine is started by turning off the engine and restarting the engine. After the signal is changed, the start condition is determined by a predetermined control logic according to the operation of the accelerator pedal or the brake pedal, and the process is restarted.

The ISG device is variously mounted in a vehicle equipped with a manual transmission or an automatic transmission, and is mainly limited to a passenger vehicle. Recently, it has been installed in buses and super large trucks due to the necessity of improving fuel efficiency.

In the case of a commercial vehicle such as a super-large truck, a manual transmission is mainly used due to a problem of load and fuel consumption during operation of the vehicle, but an automatic manual transmission may be mounted to achieve the purpose of convenience. An automatic manual transmission is a transmission having a structure of a manual transmission, but a device for automatically interrupting the clutch and operating the shift lever is added.

Therefore, there is a need to differentiate the ISG logic in a vehicle in which an automatic manual transmission is mounted in contrast to the ISG logic configured in a typical passenger vehicle. In other words, a vehicle equipped with an automatic manual transmission has an automatic manual transmission that takes into account the fact that the weight of the vehicle is large and the influence of inertia is large and the structure of the existing manual transmission is difficult, The development of an ISG logic suitable for a vehicle in which the vehicle is in operation is requested.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of controlling an ISG of a vehicle equipped with an automatic manual transmission that is optimized for a transmission and a vehicle in a vehicle equipped with an automatic manual transmission.

Particularly, the present invention provides a method of controlling an ISG of a vehicle equipped with an automatic manual transmission in which the fuel economy can be further improved by improving the ISG logic on the downhill road considering the large weight and inertia of a vehicle equipped with the automatic manual transmission The purpose.

According to another aspect of the present invention, there is provided a vehicular drive system including a downshift step of downshifting a gear when a vehicle is decelerated, a clutch release step of releasing a clutch when the vehicle is stopped, A neutral driving step in which the gear position is recognized as neutral, a third driving step in which a third driving operation is performed at the start of the vehicle on the downhill gradient, a gear setting step in which the gear position is recognized as a predetermined gear position, And a starting step in which the starting is turned ON. The automatic downshift ISG control method of the automatic manual transmission vehicle is provided.

In the starting step, the rotation of the wheel is reversely driven by the engine so that the starting can be turned ON.

Further comprising a vehicle speed determining step of comparing a vehicle speed and a set speed after the third driving step, and if the vehicle speed is determined to be smaller than the set speed in the determining step, the third driving operation can be continued until the set speed is reached.

The set speed is preferably 10 kph.

Further comprising a tilt determining step of comparing the tilt measured by the tilt sensor with the tilt measured by the tilt sensor after the neutral step, wherein if the tilt measured at the tilt determining step is less than the set tilt, (ON).

The inclination set preferably is 2%.

The downward ISG control method of an automotive manual transmission vehicle according to the present invention improves a conventional ISG device in a vehicle equipped with an automatic manual transmission so that the ISG logic is operated at the stop and start in the downward section, It is possible to improve the fuel economy by delaying the start of the engine.

Further, by adopting the ON-state of the starting by the reverse driving force which transmits the rotational force of the wheel due to the inertia to the engine for the predetermined time, the electric load is reduced and the fuel efficiency is further improved.

1 is a flowchart of a method of controlling a downhill section ISG of an automatic manual transmission vehicle according to the concept of the present invention.
2 is a flowchart of a downhill segment ISG control method of an automatic manual transmission vehicle according to an embodiment of the present invention.
3 is a flowchart of a downhill segment ISG control method of an automatic manual transmission vehicle according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method of controlling an ISG of a downhill section of an automatic manual transmission according to the present invention will be described in detail with reference to the accompanying drawings.

The present invention basically describes a commercial vehicle on which an automatic manual transmission is mounted. The basic concept of the present invention is to provide a vehicle equipped with an automatic manual transmission, an automatic transmission in which a torque converter or a fluid clutch is coupled, It should be noted that the present invention does not exclude the application to the vehicle of the type.

2 is a flowchart showing a method of controlling an ISG of a downhill section of an automatic manual transmission vehicle according to a basic concept of the present invention. Hereinafter, in the description of the present invention, the vehicle means a vehicle equipped with an automatic manual transmission and equipped with an ISG. For example, there may be a predetermined button that allows the ISG logic to be operated on a portion such as a dashboard that can be operated from the driver's seat, and can be selected to enable or disable the ISG via this button, The ISG logic can be operated if the predetermined operating condition such as the elapsed time set at the time of stopping the vehicle is satisfied.

The downshift ISG control method of an automatic manual transmission vehicle according to the present invention basically includes a downshift step S120 in which a gear is downshifted when the vehicle is decelerated S110, A neutral step S160 in which the gear position is recognized as neutral (N: Neutral), and a clutch release step (S140) in which the clutch is released when the clutch is released (S130) (S210) in which a counter-drive operation is performed in a neutral state at the start of the vehicle at a downward slope, a gear setting step (S220) in which a gear position is recognized as a predetermined position under a predetermined condition, (S230), and a startup step S240 in which the driving force of the wheel is transmitted to the engine to turn on the engine.

Deceleration (S110) means that there is a need for a temporary stop such as waiting for a signal in a predetermined running state, and the driver decelerates for stopping. Therefore, the deceleration condition is such that the gear operating portion is placed in the drive (D) state, and the power transmitted to the accelerator pedal is equal to zero or the accelerator is deployed less than the engine speed corresponding to the current speed It can mean. This deceleration condition may mean a state in which the engine brake is operated or a state in which braking is performed by providing a brake force to the brake pedal.

When the deceleration (S110) is performed as described above, there is a need to change the position of the gear to a gear ratio necessary for deceleration, and preferably the position is changed to a set position through a downshift. The position setting of these gears can be set by the TCU (Transmission Control Unit) of the automatic manual transmission. This TCU is linked with the ECU (Electronic Control Unit) and the result of the operation of the driver, Upshift or downshift of the gear in consideration of the gear ratio of the gear. Setting or changing the position of the gear to be described below can be done in the TCU.

The number of downshifts by the TCU at the time of deceleration can be selectively made depending on the type of the vehicle or the environment.

When the downshifting is performed as described above and the vehicle is stopped at a predetermined position (S130), the clutch is disengaged (S140), and the vehicle is kept in the waiting standby state without the driving force being transmitted to the wheel.

At this time, as a function of the ISG, a step of turning off the starter (S150) is performed. In this OFF state of the start, the TCU at this time is recognized as a state of neutral (N).

When the vehicle is stopped and there is a need to start the vehicle, in the conventional case, when the driver depresses the accelerator pedal or releases the brake pedal, the engine is automatically turned on. In the case of downhill inclination, Since acceleration is possible, unnecessary energy consumption may occur at restart.

According to the present invention, the downhill slope is followed by a downhill running step S210 in which the vehicle starts its own weight without turning on the engine at the time of restarting the vehicle. Here, "second line" means driving without a load due to power or braking.

In this case, when the run-off operation by self-weight is started at the start of the downhill, the start-up of the engine for acceleration at the start is unnecessary, so that the effect of fuel saving can be maximized. In particular, in the case of a vehicle having a large weight and inertia such as a very large truck, it is important to note that the effect of such downhill running is further improved.

When the start of the downward slope is started as described above, the TCU recognizes the gear as a preset position at a predetermined speed (S220) and connects the clutch (S230). The set position of these gears can be made according to choice, and the position setting of such gears is preferably made at such a value that the engine and transmission are not overloaded.

When the coupling of the clutch S230 is performed, the rotational force of the wheel according to the vehicle speed is transmitted to the transmission through the predetermined shaft, the reverse driving force is transmitted to the engine connected to the input shaft of the transmission, (S240)

As described above, when the engine is turned on by the reverse driving force due to the rotation of the wheel, the conventional ISG device generates a rotational force through a predetermined electric motor to turn on the ignition So that the electric load can be reduced, so that it is possible to reduce the additional energy consumption.

FIG. 2 is a flowchart showing a more detailed embodiment of the downward section ISG control method of the automatic manual transmission vehicle of the present invention.

As described above, when the deceleration (S110) is performed for the stop, the TCU performs downshifting (S121) to the set gear position. The gear position of the set deceleration is preferably three stages, but is not limited thereto.

When the downshift is performed, the vehicle is stopped (S130) and the clutch is automatically released (S150) after the clutch is disengaged (S140), and the TCU is recognized as the neutral (N) state .

As described above, in the condition of the present invention, the operation of the ISG at the time of stopping and resuming the vehicle on the downhill is presented, and downhill running operation (S210) due to its own weight at the time of restart is started.

Here, the step of step S210 is continued for a predetermined period of time, and the drive system is connected as described above to turn on the starting by the reverse driving force. Is required.

The predetermined condition may be determined according to the vehicle speed, and thus may further include a step S211 of determining the vehicle speed after the downhill running operation S210.

The step of determining the vehicle speed S211 may be performed by comparing a preset value with a value input through the speed measuring device. Preferably, the predetermined value is set to 10 kph in order to prevent an excessive load on the engine or the driving system But is not necessarily limited thereto.

Therefore, if the vehicle speed is equal to or greater than the predetermined value in step S211, the gear position is recognized as a set value (S220) and the clutch is connected (S230) , S240) are performed.

If the vehicle speed is equal to or less than the set value in the step S211, the downhill running operation S210 may be continued until the vehicle speed reaches a predetermined value.

FIG. 3 shows another embodiment of the method of controlling the downward section ISG of the above-described automatic manual transmission vehicle.

The above-described deceleration (S110), change of the gear position set by the TCU (S121), stopping of the vehicle (S130), disengagement of the clutch (S140), off of the start (OFF, S150) (S160) will not be repeated.

A further concept of the present invention may further include a step of judging an inclination at the time of stopping and restarting. Therefore, after the neutral recognition of the gear by the TCU (S160), it is possible to further include the inclination determination step (S310). The step of determining the degree of inclination may be performed by a predetermined inclination sensor provided in the vehicle. The inclination degree may be set to a predetermined value at which the vehicle can run downhill due to its own weight, so that the actual inclination can be compared. Preferably, the value of the slope is set to about 2%, but is not limited thereto.

For example, when the value of the inclination set is 2% and the downward inclination measured by the inclination sensor is smaller than 2%, it is judged that the other running operation is practically impossible. (S330) in which it is forcibly turned on (ON).

The driving start determination (S320) may be performed by a method of detecting a predetermined operation by the driver. For example, it may be determined that the driving pedal is released from the brake pedal or the answer to the accelerator pedal is started.

Here, the step S330 of turning ON the start-up is performed by an electric rotating means such as a self-starter, unlike the case of the other running operation.

After the start of the engine is turned ON, the gear is moved to a predetermined position (S340) and the clutch is engaged (S350) as in the normal start.

If the downward inclination measured by the inclination sensor is larger than the set inclination value, it is possible to perform the other running operation. In the downhill running step S210 and the step S211 of comparing the set speed of the vehicle speed as described above, The step S220 of recognizing the set gear position by the TCU, the step of connecting the clutch S230, and the step S240 of turning on the starting by the reverse driving force.

As described above, in the downhill section ISG control method of the automatic manual transmission according to the present invention, the conventional ISG device is improved in a vehicle equipped with an automatic manual transmission, so that the ISG logic is operated at the stop and departure in the downward section, It is possible to improve the fuel economy by delaying the start time by performing the other running operation by its own weight in the starting step.

Further, by adopting the ON-state of the starting by the reverse driving force which transmits the rotational force of the wheel due to the inertia to the engine for the predetermined time, the electric load is reduced and the additional fuel efficiency is improved.

In the foregoing, the present invention has been described in detail based on the embodiments and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the content of the following claims.

S120 ... Downshifting step S140 ... Clutch release step
S150 ... Off step S160 ... Neutral step
S210 < / RTI >< RTI ID = 0.0 >
S230 ... Clutch connecting step S240 ... Starting step

Claims (6)

A downshifting step (S120) in which downshifting of the gear occurs when the vehicle is decelerated;
A clutch releasing step (S140) of releasing the clutch when the vehicle is stopped;
OFF step S150 in which the starting is OFF;
A neutral step S160 in which the gear position is recognized as neutral;
A second running step S210 in which a third running operation is performed when the vehicle starts at a downhill inclination;
A gear setting step S220 of recognizing the gear position as a preset gear position;
A clutch connecting step (S230) in which the clutch is connected; And
And a starting step (S240) in which the starting of the automatic downshifting is turned on. The method according to claim 1,
Wherein the starting step S240 is a step in which the rotation of the wheel is reversely driven by the engine so that the starting is turned on. The method according to claim 1,
Further comprising a vehicle speed determining step (S211) of comparing the vehicle speed and the set speed after the step of running the second line (S210)
If it is determined in step S211 that the vehicle speed is less than the predetermined speed, the third-speed driving continues until the speed is reached. The method of claim 3,
Wherein the predetermined speed is 10 kph. The method according to claim 1,
Further comprising a slope determination step (S310) of comparing the slope measured by the slope sensor with the set slope after the neutral step (S160)
If it is determined that the inclination measured in the inclination determination step S310 is smaller than the predetermined inclination degree, the control unit proceeds to step S330 in which the start of the automotive manual transmission is turned on by the self-starter (step S330) Control method. 6. The method of claim 5,
Wherein the predetermined inclination is 2%. ≪ RTI ID = 0.0 > [10] < / RTI >

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