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KR-102962093-B1 - APPARATUS AND METHOD FOR CONTOLLING DRIVING OF VEHICLE

KR102962093B1KR 102962093 B1KR102962093 B1KR 102962093B1KR-102962093-B1

Abstract

The vehicle driving control device of the present invention includes a sensor that detects whether an accelerator pedal is pressed and the rotational speed of an engine, and a control unit that determines whether coasting is performed based on whether the accelerator pedal is pressed, and if coasting is performed, determines whether to change the gear ratio of a transmission based on the rotational speed of the engine, thereby providing the effect of improving the fuel efficiency of a vehicle by increasing the coasting distance during the coasting deceleration section.

Inventors

  • 황진영
  • 이재준
  • 박종술
  • 김진호
  • 김종성

Assignees

  • 현대자동차주식회사
  • 기아 주식회사

Dates

Publication Date
20260511
Application Date
20200210

Claims (12)

  1. A sensor that detects whether the accelerator pedal is being pressed and the engine's rotational speed; and The control unit determines whether coasting is performed based on whether the accelerator pedal is pressed, and if coasting is performed, determines whether to change the gear ratio of the transmission based on the engine speed. The above control unit If the current gear ratio is not the highest gear ratio, calculate the engine speed corresponding to a gear ratio higher than the current gear ratio, and A vehicle driving control device that, when the engine rotational speed calculated corresponding to a gear ratio higher than the current gear ratio exceeds a threshold value, determines that the vehicle can be kept running at the calculated engine rotational speed and controls the current gear ratio to be changed upward.
  2. In claim 1, The above control unit A vehicle driving control device that determines whether the rotational speed of the engine exceeds a threshold value, and if the rotational speed of the engine exceeds the threshold value, determines whether the current gear ratio is the highest gear ratio.
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  5. In claim 2, The above control unit A vehicle driving control device that changes the current gear ratio downwards when the rotational speed of the above engine does not exceed a threshold value.
  6. In claim 1, The above control unit A vehicle driving control device that controls the vehicle to maintain a preset gear ratio when it is determined that the above-mentioned accelerator pedal is pressed.
  7. A step of detecting whether the accelerator pedal is being pressed and the engine's rotational speed; and The method includes a step of determining whether coasting is performed based on whether the accelerator pedal is pressed, and if coasting is performed, determining whether to change the gear ratio of the transmission based on the rotational speed of the engine. If the current gear ratio is not the highest gear ratio, the method further includes the step of calculating the engine speed corresponding to a gear ratio higher than the current gear ratio. A step of determining whether the engine rotational speed calculated corresponding to a gear ratio higher than the current gear ratio exceeds a threshold value; and A vehicle driving control method that determines that the vehicle can be kept running at the calculated engine speed when the engine speed calculated above exceeds the threshold value, and changes the current gear ratio upward.
  8. In claim 7, A step of determining whether the rotational speed of the above engine exceeds a threshold value; A vehicle driving control method further comprising a step of determining whether the current gear ratio is the highest gear ratio when the rotational speed of the engine exceeds a threshold value.
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  11. In claim 8, A vehicle driving control method that changes the current gear ratio downward when the rotational speed of the above-mentioned engine does not exceed a threshold value.
  12. In claim 7, A vehicle driving control method further comprising the step of controlling to maintain a preset gear ratio when it is determined that the above-mentioned accelerator pedal is pressed.

Description

Apparatus and Method for Controlling Driving of Vehicle The present invention relates to a vehicle driving control device and method. Since higher fuel efficiency allows a vehicle to travel a longer distance with the same amount of fuel, fuel efficiency serves as an important criterion for users when selecting a vehicle, and accordingly, technology development to improve fuel efficiency is underway. Generally, to improve fuel efficiency, the vehicle is controlled to use a region where engine efficiency is higher than constant speed during acceleration, and during deceleration, the fuel is cut off to coast and decelerate. In particular, when controlling fuel cut-off during coasting deceleration, the gear lever is maintained in the D position to prevent the engine from stalling, and the engine RPM corresponding to the preset gear is maintained. If the engine RPM is maintained above a certain level by the preset gear, resistance increases, reducing the actual driving distance, and in such cases, a problem arises where overall fuel efficiency decreases. FIG. 1 is a configuration diagram showing the configuration of a vehicle driving control device according to one embodiment of the present invention. FIGS. 2 and FIGS. 3 are graphs showing results controlled by a vehicle driving control device according to an embodiment of the present invention. FIG. 4 is a flowchart illustrating a vehicle driving control method according to one embodiment of the present invention. Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted. In describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are intended merely to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the terms. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application. FIG. 1 is a configuration diagram showing the configuration of a vehicle driving control device according to one embodiment of the present invention. As illustrated in FIG. 1, the vehicle driving control device (100) may include a sensor (110), a transmission (120), and a control unit (130). The sensor (110) can detect driving information of the vehicle. According to an embodiment of the present invention, the driving information of the vehicle may include information on the pressure state of the accelerator pedal for controlling the acceleration and deceleration of the vehicle speed, vehicle speed information, vehicle engine rotational speed information, and gear state information (current gear input information). To this end, the sensor (110) may include a speed sensor, an engine rotational speed sensor, a gear sensor, etc. The transmission (120) refers to a device that shifts the engine's power between the engine and the vehicle's drive wheels to match the vehicle's driving speed, and the lower the gear ratio of the transmission, the higher the engine rotation speed, and the higher the gear ratio, the lower the engine rotation speed. The control unit (130) can be implemented by various processing devices, such as a microprocessor with a semiconductor chip capable of performing calculations or executions of various commands, and can control the operation of a vehicle driving control device according to an embodiment of the present invention. Specifically, the control unit (130) determines whether coasting is possible based on whether the accelerator pedal is pressed, and if coasting is possible, determines whether to change the gear ratio of the transmission based on the engine rotational speed. More specifically, the control unit (130) determines whether the accelerator pedal is being pressed. The control unit (130) can determine whether the accelerator pedal is being pressed based on information regarding the accelerator pedal pressing state obtained from the sensor (110). If the control unit (130) determines that the accelerator pedal is not being pressed, it det