JP2014173455A - Control device of idle stop vehicle - Google Patents

Control device of idle stop vehicle Download PDF

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Publication number
JP2014173455A
JP2014173455A JP2013044930A JP2013044930A JP2014173455A JP 2014173455 A JP2014173455 A JP 2014173455A JP 2013044930 A JP2013044930 A JP 2013044930A JP 2013044930 A JP2013044930 A JP 2013044930A JP 2014173455 A JP2014173455 A JP 2014173455A
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Japan
Prior art keywords
deceleration
engine
control
vehicle
idle stop
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JP2013044930A
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Japanese (ja)
Inventor
Kosuke Sakagami
航介 坂上
Original Assignee
Daihatsu Motor Co Ltd
ダイハツ工業株式会社
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Priority to JP2013044930A priority Critical patent/JP2014173455A/en
Publication of JP2014173455A publication Critical patent/JP2014173455A/en
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Abstract

PROBLEM TO BE SOLVED: To improve fuel economy by avoiding that an engine automatic stop by idle stop control becomes impossible accompanied by an increase of deceleration at following traveling control when a vehicle comprises: an idle stop function including that the deceleration is smaller than a prescribed value in an engine stop condition; and a following traveling control function.SOLUTION: When it is determined that there is no risk of a collision with a preceding vehicle, and a followable prescribed inter-vehicle distance can be maintained even if alleviating deceleration by following traveling control to a value smaller than prescribed deceleration being an engine stop condition, an ACC control part 15 minutely switches the deceleration by the following traveling control to the value smaller than the prescribed deceleration being the engine stop condition, and alleviates a degree of the deceleration at the following traveling control. Therefore, the occurrence of a situation is suppressed that a condition being smaller than the deceleration out of the engine stop conditions due to an increase of the deceleration by the following traveling control is not satisfied, and the engine automatic stop by the idle stop control cannot be performed. Thus the improvement of fuel economy becomes possible.

Description

  The present invention relates to a control device for an idle stop vehicle that stops an engine when a predetermined engine stop condition is satisfied, enters an idle stop state, and restarts the engine when a predetermined engine restart condition is satisfied in the idle stop state.
  Conventionally, a so-called idle stop vehicle starts an engine by an IG (ignition) on operation, and thereafter executes an idle stop control until the engine is stopped by an IG off operation. The engine is automatically stopped and the engine is automatically restarted when a predetermined engine restart condition is satisfied.
  In recent years, a vehicle with this type of idle stop control function has also been equipped with a follow-up running control function that follows a preceding vehicle by decelerating with acceleration and automatic braking while maintaining a predetermined inter-vehicle distance with respect to the preceding vehicle. It is considered to prepare (see Patent Document 1).
JP 2004-245099 A (see paragraphs 0007, 0009 to 0013)
  By the way, as described in Patent Document 1, in a vehicle having a follow-up running function and an idle stop function, the engine stop condition in the idle stop control may include that the deceleration is less than a predetermined value. If the deceleration caused by the operation of the automatic brake in the follow-up control is stronger than the deceleration in the engine stop condition of the idle stop control, all engine stop conditions will be satisfied even if other engine stop conditions other than the deceleration are satisfied. Is not satisfied, the engine stop condition of the idle stop control is determined to be not satisfied and the idle stop may not be performed, which hinders improvement in fuel consumption.
  According to the present invention, when the engine stop condition includes an idle stop control function including the deceleration being less than a predetermined value and a follow-up running control function, the idle stop control is accompanied by an increase in the deceleration in the follow-up running control. The purpose is to prevent the automatic stop of the engine from being performed and to improve the fuel consumption.
  In order to achieve the above-described object, the control device for an idle stop vehicle according to the present invention stops the engine in accordance with establishment of a predetermined engine stop condition to enter an idle stop state, and the predetermined engine restart condition is satisfied in the idle stop state. In an idle stop vehicle control device that restarts the engine when established, the engine is automatically stopped and the vehicle is idle stopped when the engine stop condition is satisfied, including being less than a predetermined deceleration during traveling. Idle stop control means for making a state, follow-up running control means for carrying out follow-up running control that follows the preceding vehicle by acceleration and deceleration while maintaining a predetermined inter-vehicle distance with respect to the preceding vehicle, and deceleration by the following running control Is greater than the deceleration under the engine stop condition, and the deceleration is not performed under the engine stop condition. And determining means for determining whether or not the predetermined inter-vehicle distance can be ensured even if relaxed, and the follow-up travel control means determines that the predetermined inter-vehicle distance can be ensured by the determining means When this is done, deceleration by the follow-up running control is eased (claim 1).
  According to the first aspect of the present invention, even if the deceleration by the follow-up running control is equal to or greater than the deceleration under the engine stop condition, and the deceleration is less than the deceleration under the engine stop condition, the predetermined inter-vehicle distance in the follow-up running is reduced. If it is determined by the determining means that the state can be secured, the follow-up running control means alleviates the deceleration by the follow-up running control to, for example, less than the deceleration of the engine stop condition.
  As a result, since the deceleration by the follow-up running control is less than the deceleration that is the engine stop condition in the idle stop control, the engine is controlled to the idle stop state when all the engine stop conditions including the deceleration are satisfied. As described above, it is possible to prevent the automatic stop of the engine due to the idle stop control from being performed without being satisfied with the condition that the deceleration due to the following traveling control becomes strong and the engine stop condition is less than the deceleration. It can be improved so that the idle stop control is executed, and the fuel efficiency can be improved.
It is a block diagram of one embodiment of a control device of an idle stop car of the present invention.
  Next, an embodiment of the present invention will be described with reference to FIG.
  As shown in FIG. 1, the idle stop vehicle 1 has a single lead battery 2 having a relatively small capacity of 12 V as a power source in order to reduce the weight, the size, and the like. It is connected to the vehicle body of the stop vehicle 1.
  The engine 3 that is the drive source of the idle stop vehicle 1 has a transmission-side CVT 4, and a torque converter (including a lock-up clutch mechanism) 5 is interposed between the CVT 4 and the engine 3.
  The engine 3 is started by a starter 6. The starter 6 is supplied with power from the battery 2 via a relay 7 and generates a driving force for starting the engine 3. Further, a battery sensor 8 provided close to the battery 2 between the positive terminal of the battery 2 and the relay 7 outputs a temperature / current detection signal of the battery 2 to an idle stop control unit described later, and the engine 3 Is transmitted to the alternator 9, which is a generator, via the belt 10, and the battery 2 is charged by the power generation output of the alternator 9 while the vehicle is running.
  Further, as shown in FIG. 1, the idle stop vehicle 1 is provided with an idle stop control unit (corresponding to the idle stop control means in the present invention) 11 formed by the idle stop control ECU. The engine control unit 12 to be formed, the brake control unit 13 formed by a vehicle stability control (VSC) ECU for skid control, the CVT control unit 14 formed by an ECU for CVT (Continuously Variable Transmission) control, and the ACC in the full vehicle speed range (Adaptive Cruise Control) The ACC control part 15 which ECU of control forms is provided, and each of these control parts 11-15 are each formed by the microcomputer etc., and CAN etc. And exchanges of information via the signal bus 16.
  The idle stop control unit 11 then determines a predetermined engine stop condition including a deceleration that is less than a predetermined value (for example, a condition that the stop lamp is lit, is less than a predetermined vehicle speed, and is less than a predetermined deceleration). ) Is confirmed, an engine stop command is output to the engine control unit 12 when the vehicle speed is reduced to a predetermined vehicle speed or less (for example, 7 km / h or less) even if the travel is not completely stopped. Stopped. Subsequently, when the driver removes his / her foot from the brake pedal in the automatic stop state, it is confirmed by the idle stop control unit 11 that a predetermined engine restart condition is satisfied, and the stopped engine 3 is automatically restarted. The
  Further, as shown in FIG. 1, a vehicle speed sensor 18 is provided that detects the vehicle speed and provides the vehicle speed information to the brake control unit 13. The hydraulic pressure sensor provides the brake control unit 13 with detection information of the master cylinder pressure of the brake mechanism. 19, a steering angle sensor 20 for detecting the steering angle of the steering is provided, and a display unit 21 formed by a combination meter is provided on the dashboard. Various display data received via the communication bus 16 are stored in the dashboard. It is displayed on the display unit 21.
  Further, the ACC control unit 15 corresponds to the following traveling control means in the present invention, takes in a detection signal of the laser radar 22 that measures the distance from the preceding vehicle ahead of the host vehicle at predetermined time intervals, and controls the brake control unit 13 and the communication bus. 16, the vehicle speed information of the host vehicle detected by the vehicle speed sensor 18 is taken in, and based on the inter-vehicle distance from the preceding vehicle and the host vehicle speed, it is detected whether or not there is a possibility of collision with the preceding vehicle. When the main switch 23 is turned on, the ACC control unit 15 enters a standby state. When the ACC set switch 24 is turned on in the standby state, acceleration and deceleration are controlled by the engine control unit 12 and the brake control unit 13. Follows the preceding vehicle while maintaining a predetermined distance that is not likely to collide with the vehicle speed at that time. Performing follow-up running control in full speed range that. Even if the ACC main switch 23 is in the standby state, the follow-up running control is not executed if the ACC set switch 24 is off, and the ACC control unit 15 does not operate if the ACC main switch 23 is off.
  By the way, the brake control unit 13 controls a brake hydraulic pressure control valve (for example, a solenoid valve) downstream of the master cylinder (not shown) at the time of a driver's sudden braking operation or braking operation on a low friction road, and brakes for each wheel. Brake control is executed to control the force and prevent sliding due to wheel lock.
  When the ACC control unit 15 detects that there is a possibility of collision with an obstacle such as a vehicle ahead, the ACC control unit 15 outputs an automatic brake command to the brake control unit 13, The brake control unit 13 controls the brake hydraulic pressure control valve downstream of the master cylinder so as to perform deceleration to avoid collision with an obstacle, and automatically applies the brake regardless of the operation of the brake pedal by the driver. Automatic brake operation control is executed. At this time, when the brake fluid pressure control valve is controlled, the valve opening / closing degree is controlled by the electric power of the battery 2, and the electric energy of the battery 2 is used.
  An idle stop operation of the idle stop vehicle 1 having such a configuration will be briefly described. When a driver turns on an IG key (not shown) to instruct an engine start, an IG on signal is transmitted to a communication bus, for example. 16 is input to the idle stop control unit 11, and based on this input, the idle stop control unit 11 energizes the relay 7 instantaneously to turn it on, and feeds the power of the lead battery 2 to the starter 6 to start the starter 6. Then, the stopped engine 3 is started (initial start). Once the engine 3 is started and the lead battery 2 is once fully charged with the power generated by the alternator 9, the idle stop control unit 11 is then idle stopped until the engine 3 is stopped by turning off the IG key. Execute control.
  The idle stop control unit 11 includes information on the engine control unit 12 (engine information such as the engine speed and cooling water temperature), information on the current and temperature of the battery 2, and the brake control unit 13 via the communication bus 16. Information on the vehicle speed detected by the vehicle speed sensor 18 via the vehicle, information on the master cylinder pressure by the hydraulic pressure sensor 19, lock-up clutch information on the CVT control unit 14, information on switches in various parts of the vehicle such as a stop lamp switch and a courtesy switch (not shown), etc. Is entered.
  Based on this information, the idle stop control unit 11 during the idle stop control confirms that the driver depresses the brake pedal according to a red signal of the traffic signal and the like, and that the master cylinder pressure is equal to or higher than a predetermined depression pressure. When detected, by confirming that a predetermined engine stop condition for idle stop control (for example, a condition that the stop lamp is lit and the vehicle speed is equal to or less than the predetermined vehicle speed) is satisfied, the predetermined vehicle speed If the speed falls below (for example, 7 km / h or less), an engine stop command is output to the engine control unit 12, and the engine control unit 12 throttles the fuel throttle to automatically stop the engine 3.
  Next, when it is detected that the driver has lifted his / her foot from the brake pedal and the master cylinder pressure has dropped to a predetermined release pressure, for example, the traffic signal changes to a green light, the idle stop control unit 11 performs a predetermined idle stop control. After confirming that the engine restart condition is satisfied, the idle stop control unit 11 energizes the relay 7 instantaneously to turn it on, supplies the power of the battery 2 to the starter 6, starts the starter 6, and stops the engine 3. Will automatically restart. Thereafter, automatic stop of the engine 3 based on establishment of a predetermined engine stop condition during deceleration and automatic restart of the engine 3 based on establishment of a predetermined engine restart condition are alternately performed.
  At this time, when the engine 3 is restarted, the engine speed information reaches the speed indicating complete explosion, the brake force returns to the original state changing according to the master cylinder pressure, and the accelerator pedal is not depressed. This is a so-called idling state, and the engine 3 and the torque converter 5 generate a creep force that allows the idle stop vehicle 1 to start even in this idling state.
  By the way, the ACC control unit 15 determines that the actual deceleration by the follow-up running control is equal to or greater than the deceleration that is the engine stop condition in the idle stop control of the idle stop control unit 11, and the deceleration is less than the predetermined deceleration that is the engine stop condition. Even if it is relaxed, it has a function as a determination means in the present invention for determining whether or not it is in a state where a predetermined inter-vehicle distance that can be followed without fear of colliding with the preceding vehicle can be secured.
  Then, the ACC control unit 15 determines that the predetermined inter-vehicle distance can be achieved without causing a collision with the preceding vehicle even if deceleration by the follow-up traveling control is reduced to less than the predetermined deceleration that is the engine stop condition. Then, the deceleration by the follow-up running control is switched to be smaller than the predetermined deceleration that is the engine stop condition, and the degree of deceleration in the follow-up running control is relaxed.
  Therefore, since the deceleration in the follow-up running control by the ACC control unit 15 is switched to less than the deceleration that is the engine stop condition in the idle stop control, if all engine stop conditions including the deceleration are satisfied, the idle stop Controlled by the state. As a result, the frequency of occurrence of a situation in which the automatic stop of the engine by the idle stop control cannot be performed because the deceleration by the following traveling control becomes strong and the condition of the engine stop condition that is less than the deceleration is not satisfied as in the conventional case. Is suppressed.
  Therefore, according to the above-described embodiment, in the idle stop vehicle 1 having the following traveling function and the idle stop function, the deceleration by the following traveling control is switched to less than the deceleration that is the engine stop condition in the idle stop control. Therefore, since all the engine stop conditions including deceleration are established, the engine is controlled to the idle stop state. Therefore, as in the past, the condition that the deceleration by the follow-up running control becomes stronger and less than the deceleration among the engine stop conditions. It is possible to prevent the engine from being automatically stopped by the idle stop control without being satisfied, and improve the idle stop control to be executed as much as possible, thereby improving the fuel consumption.
  The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention.
  For example, in the above-described embodiment, an idle stop vehicle equipped with only the engine 3 has been described, but the present invention can also be applied to a hybrid vehicle using both an engine and a motor.
DESCRIPTION OF SYMBOLS 1 ... Idle stop vehicle 3 ... Engine 11 ... Idle stop control part (idle stop control means)
15 ACC control unit (follow-up travel control means, determination means)

Claims (1)

  1. In a control device for an idle stop vehicle that stops the engine by establishment of a predetermined engine stop condition and enters an idle stop state, and restarts the engine by establishment of a predetermined engine restart condition in the idle stop state.
    Idle stop control means for automatically stopping the engine and bringing the vehicle into an idle stop state by satisfying the engine stop condition including being less than a predetermined deceleration during traveling;
    Follow-up running control means for performing follow-up running control for running following the preceding vehicle by acceleration and deceleration while maintaining a predetermined inter-vehicle distance with respect to the preceding vehicle;
    It is determined whether or not the deceleration by the follow-up running control is equal to or greater than the deceleration under the engine stop condition, and the predetermined inter-vehicle distance can be secured even if the deceleration is relaxed to less than the deceleration under the engine stop condition. Judgment means,
    The control apparatus for an idle stop vehicle, wherein the follow-up running control means relaxes deceleration by the follow-up running control when the judging means determines that the predetermined inter-vehicle distance can be secured.
JP2013044930A 2013-03-07 2013-03-07 Control device of idle stop vehicle Pending JP2014173455A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2013044930A JP2014173455A (en) 2013-03-07 2013-03-07 Control device of idle stop vehicle

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Application Number Priority Date Filing Date Title
JP2013044930A JP2014173455A (en) 2013-03-07 2013-03-07 Control device of idle stop vehicle

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JP2014173455A true JP2014173455A (en) 2014-09-22

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6261832A (en) * 1985-09-13 1987-03-18 Mazda Motor Corp Travel control unit for vehicle
JP2002236994A (en) * 2001-02-09 2002-08-23 Nissan Motor Co Ltd Travel support device using intersection information
JP2004245099A (en) * 2003-02-13 2004-09-02 Nissan Motor Co Ltd Engine automatic stopping device
JP2010167994A (en) * 2009-01-26 2010-08-05 Toyota Motor Corp Vehicular traveling control device
JP2010264776A (en) * 2009-05-12 2010-11-25 Honda Motor Co Ltd Follow-up traveling control device for vehicle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6261832A (en) * 1985-09-13 1987-03-18 Mazda Motor Corp Travel control unit for vehicle
JP2002236994A (en) * 2001-02-09 2002-08-23 Nissan Motor Co Ltd Travel support device using intersection information
JP2004245099A (en) * 2003-02-13 2004-09-02 Nissan Motor Co Ltd Engine automatic stopping device
JP2010167994A (en) * 2009-01-26 2010-08-05 Toyota Motor Corp Vehicular traveling control device
JP2010264776A (en) * 2009-05-12 2010-11-25 Honda Motor Co Ltd Follow-up traveling control device for vehicle

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