KR20160146212A - Ssc control method according to external environment and ssc control apparatus therefor - Google Patents

Abstract

The present invention relates to SSC control method and apparatus according to an external environment. According to an embodiment of the present invention, the start/stop coasting (SSC) control method according to an external environment includes the following steps of: (S100) determining whether the mode is an economical driving mode; (S200) measuring an external environmental condition when in the economical driving mode; (S300) determining whether the measured external environment condition satisfies a predetermined SSC entry condition; (S400) determining whether the difference between the target vehicle speed of auto cruise/speed limiter (ABS) and the current vehicle speed is less than a preset first reference value, when the measured external environment condition satisfies the predetermined SSC entry condition; and (S500) entering the SSC or maintaining an SSC entry state when the difference between the target vehicle speed of the ABS and the current vehicle speed is less than the preset first reference value. According to the present invention, it is possible to prevent unnecessary coasting release and re-entry, and accordingly maximize an effect of improving fuel economy.

Description

TECHNICAL FIELD [0001] The present invention relates to an SSC control method and an SSC control method,

The present invention relates to an SSC control method and a control apparatus according to an external environment, and more particularly, to an SSC control method and control according to an external environment that maximizes a fuel efficiency improvement effect by preventing unnecessary coasting cancellation and re- ≪ / RTI >

In recent years, due to the difference between the certified fuel consumption rate and the actual mileage of fuel consumption, it is becoming more and more important to improve the fuel efficiency of the actual road as the consumer complains. Therefore, in the automobile industry, , The surrounding traffic situation, and the road information to maximize the fuel economy when driving on the road.

For example, a technique of searching and guiding an economic driving route by utilizing IT and traffic information, a technique of guiding effective fuel economy driving by memorizing slope information and past driving patterns of a road, And a map information DB is used to select a driving mode so as to minimize fuel consumption based on the route to the destination and the traffic information based on the SOC (state of charge) level of the battery, And the like are being researched and developed.

As one of the technologies for maximizing the fuel efficiency as described above, there is the SSC (START / STOP COASTING). 1 is a view for explaining SSC (START / STOP COASTING). Referring to FIG. 1, the SSC is a technique of cutting off the fuel supply to the engine during coasting and cutting off the power transmission of the transmission (see FIG. 1 (a)). As a result, the engine drag torque is cut off, thereby increasing the travel distance as compared with the conventional vehicle (refer to FIG. 1 (b)).

In the SSC operation requirement according to the related art as described above, coasting is released immediately after a brake signal or an acceleration signal is generated. Therefore, there is a problem that the effect of improving the fuel economy is reduced due to the driver's error or the coasting cancellation due to insufficient operation. In addition, there is a problem that deterioration of sensibility quality and durability of related parts are deteriorated due to frequent SSC entering and releasing.

U.S. Published Patent Application No. 2013-0131948 (May 31, 2013)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for controlling the entering or extinguishing of coasting according to an external driving environment of a vehicle.

The method of controlling an SSC according to an external environment according to an embodiment of the present invention includes determining whether the mode is an economical driving mode (S100); A step S200 of measuring an external environmental condition in the economical driving mode; A step (S300) of judging whether the measured external environment condition satisfies a predetermined SSC (START / STOP COASTING) entry condition; (S400) if the measured external environment condition satisfies the preset SSC entry condition, determining whether the difference between the target vehicle speed of the ABS (AUTO CRUISE / SPEED LIMITER) and the current vehicle speed is less than a predetermined first reference value; And when the difference between the target vehicle speed and the current vehicle speed of the ABS is less than a predetermined first reference value, entering the SSC or maintaining the SSC entry state (S500).

In the SSC control method according to the external environment, if the difference between the target vehicle speed of the ABS and the current vehicle speed is not less than the preset first reference value, the step S600 of releasing the SSC entry state or maintaining the non-SSC entry state .

If the measured external environment condition does not satisfy the preset SSC entry condition, the SSC control method according to the external environment determines whether the difference between the target vehicle speed of the ABS (AUTO CRUISE / SPEED LIMITER) and the current vehicle speed is less than a predetermined second reference value (Step S700).

If the difference between the target vehicle speed of the ABS (AUTO CRUISE / SPEED LIMITER) and the current vehicle speed is less than a predetermined second reference value, the SSC control method according to the external environment S500 of entering the SSC or maintaining the SSC entry state .

In the SSC control method according to the external environment, when the difference between the target vehicle speed of the ABS (AUTO CRUISE / SPEED LIMITER) and the current vehicle speed is not less than the predetermined second reference value, the SSC entry state is released or the SSC non- (S600). ≪ / RTI >

And the first reference value exceeds the second reference value.

The step S200 of measuring the external environmental conditions includes measuring a distance to the front and rear vehicles (S210); Detecting a rainfall with the rain sensor (S220); Detecting whether the head lamp is operated (S230); Measuring an altitude (S240); Measuring a temperature outside the vehicle (S250); Measuring an average speed of the vehicle (S260); Measuring a speed change amount of the vehicle (S270); And measuring a steering angle of the vehicle (S280); Or the like.

The step S300 of determining whether the measured external environment condition satisfies a predetermined SSC (START / STOP COASTING) entry condition includes a step S310 of determining whether a minimum distance from the measured front and rear vehicle is less than a preset reference distance (S310). A step S320 of judging whether or not it is a rainy situation; Determining whether the headlamp is not operating (S330); Determining whether the measured altitude is less than a preset reference altitude (S340); Determining whether the measured outside temperature of the vehicle exceeds a predetermined first reference temperature and is less than a predetermined second reference temperature (S350); Determining whether an average speed of the measured vehicle exceeds a predetermined first reference speed and is less than a predetermined second reference speed (S360); Determining whether the measured speed variation of the vehicle is less than a preset reference speed variation (S370); Or determining whether the measured steering angle is less than a predetermined reference steering angle (S380); Or the like.

The SSC control method according to the external environment is stored in the storage medium according to another embodiment of the present invention.

The SSC controller according to an external environment according to another embodiment of the present invention includes the storage medium 100; A sensing unit 200 for measuring and sensing an external environmental condition of the vehicle; And a control unit 300 for receiving the measured and sensed information from the sensing unit 200 and controlling the controlled unit 400 according to the SSC control method according to the external environment stored in the storage medium 100 .

The sensing unit 200 includes an economic driving mode sensing unit 210, a distance measuring unit 220 with respect to front and rear vehicles, a rain sensor 230, a headlamp operation sensing unit 240, an altitude sensor 250, An external temperature sensor 260, an average vehicle speed measuring unit 270 of the vehicle, a speed variation measuring unit 280 of the vehicle, or a steering angle measuring unit 290.

The controlled unit 400 includes an engine 410 for injecting fuel therein; And a clutch 420 for engaging or disengaging the engine 410 and the transmission T. [

As described above, according to the present invention, it is possible to maximize the effect of improving the fuel economy by preventing unnecessary unwinding and re-entry of coasting.

In addition, it is possible to prevent frequent restarts, to improve the quality of sensibility through reduction of restart noise, and to improve the endurance performance of the related parts.

1 is a view for explaining SSC;
2 to 11 are flowcharts of a method of controlling an SSC according to an external environment according to an embodiment of the present invention.
12 and 13 are block diagrams of an SSC control apparatus according to an external environment according to another embodiment of the present invention.

It is to be understood that the words or words used in the present specification and claims are not to be construed in a conventional or dictionary sense and that the inventor can properly define the concept of a term to describe its invention in the best way And should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 to 11 are flowcharts of an SSC control method according to an external environment according to an embodiment of the present invention. 2 to 11, the SSC control method according to an external environment according to an embodiment of the present invention may include determining (S100) whether the mode is an economical driving mode; A step S200 of measuring an external environmental condition in the economical driving mode; A step (S300) of judging whether the measured external environment condition satisfies a predetermined SSC (START / STOP COASTING) entry condition; (S400) if the measured external environment condition satisfies the preset SSC entry condition, determining whether the difference between the target vehicle speed of the ABS (AUTO CRUISE / SPEED LIMITER) and the current vehicle speed is less than a predetermined first reference value; And when the difference between the target vehicle speed and the current vehicle speed of the ABS is less than a predetermined first reference value, entering the SSC or maintaining the SSC entry state (S500).

In step S100, it is determined whether or not the driver has entered the SSC according to whether the driver operates the ABS (AUTO CRUISE / SPEED LIMITER) switch or the like. In the prior art, as the entry condition of the SSC, there is no operation of the excel pedal and the brake pedal, and it is required to be not less than a predetermined vehicle speed. However, the present invention does not require the above condition, and therefore the driver is determined to enter the SSC.

The step S200 of measuring the external environmental conditions includes measuring a distance to the front and rear vehicles (S210); Detecting a rainfall with the rain sensor (S220); Detecting whether the head lamp is operated (S230); Measuring an altitude (S240); Measuring a temperature outside the vehicle (S250); Measuring an average speed of the vehicle (S260); Measuring a speed change amount of the vehicle (S270); And measuring a steering angle of the vehicle (S280); Or the like. That is, in the prior art, the SSC entry condition requires no operation of the excel pedal and the brake pedal and requires a certain speed or more. However, in the present invention, To measure the external environmental conditions. Steps S210 to S280 may be performed individually, or a plurality of steps may be performed simultaneously.

The step S300 of determining whether the measured external environment condition satisfies a predetermined SSC (START / STOP COASTING) entry condition includes a step S310 of determining whether a minimum distance from the measured front and rear vehicle is less than a preset reference distance (S310). A step S320 of judging whether or not it is a rainy situation; Determining whether the headlamp is not operating (S330); Determining whether the measured altitude is less than a preset reference altitude (S340); Determining whether the measured outside temperature of the vehicle exceeds a predetermined first reference temperature and is less than a predetermined second reference temperature (S350); Determining whether an average speed of the measured vehicle exceeds a predetermined first reference speed and is less than a predetermined second reference speed (S360); Determining whether the measured speed variation of the vehicle is less than a preset reference speed variation (S370); Or determining whether the measured steering angle is less than a predetermined reference steering angle (S380); Or the like.

If the minimum distance from the measured front and rear vehicle is less than the preset reference distance, the possibility of immediate control of the vehicle is high. Therefore, the engine is restarted by releasing the SSC. The predetermined reference distance may be set differently according to the type of the vehicle, the engine displacement or the brake performance.

Since the brake performance deteriorates in a rainy situation, the SSC is released and the engine is restarted to prepare for an emergency situation. In the case of driving at night or in the fog area, the ability of the driver to recognize obstacles is degraded. Therefore, the SSC is released and the engine is restarted to prepare for emergency situations. Whether or not the vehicle is running at night is judged by whether the head lamp is operated or not.

Further, at a certain altitude or more, the air pressure is low and the performance of the brake is deteriorated. Therefore, the SSC is released and the engine is restarted to prepare for an emergency situation. The predetermined reference altitude may be set differently according to the type of the vehicle, the engine displacement, the brake performance, or the like.

When the temperature outside the vehicle is high, the performance of the brake may deteriorate, and breakage of the brake may occur. In addition, under low temperature conditions, the ice is produced and the performance of the brake is deteriorated. Therefore, in the high temperature condition or the low temperature condition, the SSC is released and the engine is restarted to prepare for an emergency situation. The predetermined first reference temperature and the predetermined second reference temperature may be set differently according to the type of the vehicle, the engine displacement or the brake performance.

The road condition (city / national highway / highway) can be judged according to the constant speed holding time (derived from the average speed of the vehicle, the speed change amount, or the steering angle degree). For example, the speed variation and the steering angle of the vehicle are the lowest in the expressway, and increase in the order of the national road and the city. In addition, the average vehicle speed is the smallest in the city and increases in the order of the national highway. Therefore, in a city with a short constant-speed hold time, the SSC is released and the engine is restarted to prepare for changes in the vehicle speed or the steering angle. The predetermined first reference speed, the predetermined second reference speed, the predetermined reference speed variation, and the predetermined reference steering angle may be set differently according to the type of vehicle, engine displacement, brake performance, or the like.

Steps S310 to S380 may be performed individually, or a plurality of steps may be simultaneously performed. If the condition of S310 to S380 is satisfied, it is possible to perform the control of step S400.

The step of determining whether the difference between the target vehicle speed of the ABS (AUTO CRUISE / SPEED LIMITER) and the present vehicle speed is less than a predetermined first reference value (S400) determines the driver's intent to maintain the SSC. If the difference between the target vehicle speed of the ABS and the current vehicle speed is less than the preset first reference value, step S500 of entering the SSC or maintaining the SSC entry state is performed. If the difference between the target vehicle speed and the current vehicle speed of the ABS is preset If it is not less than the first reference value, the SSC entry state is canceled or the SSC non-entry state is maintained (S600).

That is, when the difference between the target vehicle speed of the ABS (AUTO CRUISE / SPEED LIMITER) set by the driver and the present vehicle speed is less than the preset first reference value, the difference between the target vehicle speed and the present vehicle speed is not large. Therefore, . If the difference between the target vehicle speed of the ABS (AUTO CRUISE / SPEED LIMITER) set by the driver and the current vehicle speed is not less than the preset first reference value, the difference between the target vehicle speed and the current vehicle speed is large, , And maintains the state that the SSC is not entered to prepare for the driver's acceleration.

If the measured external environment condition does not satisfy the preset SSC entry condition, the SSC control method according to the external environment determines whether the difference between the target vehicle speed of the ABS (AUTO CRUISE / SPEED LIMITER) and the current vehicle speed is less than a predetermined second reference value (Step S700). If the difference between the target vehicle speed of the ABS (AUTO CRUISE / SPEED LIMITER) and the current vehicle speed is less than a predetermined second reference value, the SSC control method according to the external environment may include entering the SSC or maintaining the SSC entry state ). In the SSC control method according to the external environment, when the difference between the target vehicle speed of the ABS (AUTO CRUISE / SPEED LIMITER) and the current vehicle speed is not less than the preset second reference value, the SSC entry state is released, (Step S600).

That is, even if the measured external environment condition does not satisfy the pre-established SSC entry condition, it is determined whether or not the SSC maintenance intention of the driver is to be maintained. Therefore, when the difference between the target vehicle speed of the ABS (AUTO CRUISE / SPEED LIMITER) set by the driver and the present vehicle speed is less than the preset second reference value, the difference between the target vehicle speed and the present vehicle speed is not large. Therefore, . If the difference between the target vehicle speed of the ABS (AUTO CRUISE / SPEED LIMITER) set by the driver and the current vehicle speed is not less than the preset second reference value, the difference between the target vehicle speed and the current vehicle speed is large. , And maintains the state that the SSC is not entered to prepare for the driver's acceleration.

And the first reference value exceeds the second reference value. The larger the value of the first reference value and the second reference value, the greater the effect of improving the fuel consumption performance due to the COASTING. However, the first reference value and the second reference value are different depending on the type of vehicle, Or brake performance.

12 and 13 are block diagrams of an SSC control apparatus according to an external environment according to another embodiment of the present invention. 12 and 13, an SSC control apparatus according to an external environment according to another embodiment of the present invention includes a storage medium 100 storing a SSC control method according to the external environment; A sensing unit 200 for measuring and sensing an external environmental condition of the vehicle; And a control unit 300 for receiving the measured and sensed information from the sensing unit 200 and controlling the controlled unit 400 according to the SSC control method according to the external environment stored in the storage medium 100 .

The sensing unit 200 includes an economic driving mode sensing unit 210, a distance measuring unit 220 with respect to front and rear vehicles, a rain sensor 230, a headlamp operation sensing unit 240, an altitude sensor 250, An external temperature sensor 260, an average vehicle speed measuring unit 270 of the vehicle, a speed variation measuring unit 280 of the vehicle, or a steering angle measuring unit 290.

The controlled unit 400 includes an engine 410 for injecting fuel therein; And a clutch 420 for engaging or disengaging the engine 410 and the transmission T. [

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not restrictive of the invention, as claimed, and will be fully understood by those of ordinary skill in the art. The present invention is not limited thereto. It will be apparent to those skilled in the art that various substitutions, modifications and variations are possible within the scope of the present invention, and it is obvious that those parts easily changeable by those skilled in the art are included in the scope of the present invention .

100 storage medium
200 sensing unit
210 Economical operation mode detection unit
220 Distance measuring unit with front and rear vehicles
230 Rain Sensor
240 head lamp operation detection unit
250 altitude sensor
260 External temperature sensor of the vehicle
270 Average vehicle speed measuring unit
280 Vehicle speed variation measuring unit
290 Steering angle measurement section
300 control unit
400 controlled section
410 engine
420 clutch

Claims (12)

Determining whether the mode is the economical driving mode (S100);
A step S200 of measuring an external environmental condition in the economical driving mode;
A step (S300) of judging whether the measured external environment condition satisfies a predetermined SSC (START / STOP COASTING) entry condition;
(S400) if the measured external environment condition satisfies the preset SSC entry condition, determining whether the difference between the target vehicle speed of the ABS (AUTO CRUISE / SPEED LIMITER) and the current vehicle speed is less than a predetermined first reference value; And
If the difference between the target vehicle speed of the ABS and the current vehicle speed is less than a predetermined first reference value, entering the SSC or maintaining the SSC entry state (S500);
And the SSC control method according to the external environment. The method according to claim 1,
If the difference between the target vehicle speed of the ABS and the current vehicle speed is not less than the predetermined first reference value, releasing the SSC entry state or maintaining the non-SSC entry state (S600);
(SSC) according to an external environment. 3. The method of claim 2,
(S700) if the measured external environment condition does not satisfy the preset SSC entry condition, determining whether the difference between the target vehicle speed of the ABS (AUTO CRUISE / SPEED LIMITER) and the current vehicle speed is less than a preset second reference value;
(SSC) according to an external environment. The method of claim 3,
When the difference between the target vehicle speed of the ABS (AUTO CRUISE / SPEED LIMITER) and the current vehicle speed is less than a preset second reference value, the step of entering the SSC or maintaining the SSC entry state is performed (S500) SSC control method according to the present invention. The method of claim 3,
If the difference between the target vehicle speed of the ABS (AUTO CRUISE / SPEED LIMITER) and the current vehicle speed is not less than the preset second reference value, the step S600 of releasing the SSC entry state or maintaining the SSC non-entry state is performed A method for controlling an SSC according to an external environment. The method of claim 3,
Wherein the first reference value exceeds the second reference value. The method according to claim 1,
The step of measuring the external environmental condition (S200)
Measuring a distance to the front and rear vehicles (S210);
Detecting a rainfall with the rain sensor (S220);
Detecting whether the head lamp is operated (S230);
Measuring an altitude (S240);
Measuring a temperature outside the vehicle (S250);
Measuring an average speed of the vehicle (S260);
Measuring a speed change amount of the vehicle (S270); And
Measuring a steering angle of the vehicle (S280);
The SSC control method according to the present invention is a method for controlling an SSC according to an external environment. 8. The method of claim 7,
The step S300 of determining whether the measured external environment condition satisfies a predetermined SSC (START / STOP COASTING) entry condition
Determining whether the minimum distance to the measured front and rear vehicle is equal to or less than a preset reference distance (S310);
A step S320 of judging whether or not it is a rainy situation;
Determining whether the headlamp is not operating (S330);
Determining whether the measured altitude is less than a preset reference altitude (S340);
Determining whether the measured outside temperature of the vehicle exceeds a predetermined first reference temperature and is less than a predetermined second reference temperature (S350);
Determining whether an average speed of the measured vehicle exceeds a predetermined first reference speed and is less than a predetermined second reference speed (S360);
Determining whether the measured speed variation of the vehicle is less than a preset reference speed variation (S370); or
Determining whether the measured steering angle is less than a predetermined reference steering angle (S380);
The SSC control method according to the present invention is a method for controlling an SSC according to an external environment. 9. A storage medium storing an SSC control method according to any one of claims 1 to 8. A storage medium (100) according to claim 9;
A sensing unit 200 for measuring and sensing an external environmental condition of the vehicle; And
A control unit 300 for receiving the measured and sensed information from the sensing unit 200 and controlling the controlled unit 400 according to the SSC control method according to the external environment stored in the storage medium 100;
And an SSC control unit for controlling the SSC according to the external environment. 11. The method of claim 10,
The sensing unit 200 includes an economic driving mode sensing unit 210, a distance measuring unit 220 with respect to front and rear vehicles, a rain sensor 230, a headlamp operation sensing unit 240, an altitude sensor 250, The vehicle control system according to any one of claims 1 to 3, further comprising an external temperature sensor (260), an average vehicle speed measuring unit (270) of the vehicle, a speed variation measuring unit (280) Control device. 11. The method of claim 10,
The controlled unit 400 includes an engine 410 for injecting fuel therein; And
A clutch 420 for engaging or disengaging the engine 410 and the transmission T;
And an SSC controller for controlling the SSC according to an external environment.

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