JP6241298B2 - Active cruise control device - Google Patents

Active cruise control device Download PDF

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JP6241298B2
JP6241298B2 JP2014016766A JP2014016766A JP6241298B2 JP 6241298 B2 JP6241298 B2 JP 6241298B2 JP 2014016766 A JP2014016766 A JP 2014016766A JP 2014016766 A JP2014016766 A JP 2014016766A JP 6241298 B2 JP6241298 B2 JP 6241298B2
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vehicle
engine
stop
traveling
cruise control
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JP2015143491A (en
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昂 尾▲崎▼
昂 尾▲崎▼
多加志 後藤
多加志 後藤
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マツダ株式会社
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Description

  The present invention relates to an active cruise control device.
  In vehicles, particularly automobiles, active cruise control devices that follow and follow a preceding vehicle until the vehicle is stopped, that is, until the vehicle speed becomes zero, have been put into practical use. In this active cruise control device, the brake is automatically controlled and the engine output (engine torque) is automatically controlled.
  On the other hand, many recent vehicles perform an idle stop that automatically stops the engine when the vehicle is stopped. Also, a vehicle that automatically stops the engine by idle stop when the vehicle speed is equal to or lower than a predetermined vehicle speed greater than 0 even when the vehicle is not stopped has been put into practical use.
  Patent Document 1 discloses that an engine is automatically stopped when a stop state of the host vehicle is maintained and a predetermined idle stop condition is satisfied in a vehicle equipped with an active cruise control device. Japanese Patent Application Laid-Open No. H10-228561 discloses a device that automatically activates a parking brake when the engine is automatically stopped by an idle stop.
JP 2012-206593 A JP 2012-11969 A
  By the way, when performing a follow-up run with respect to a preceding vehicle by an active cruise control device, it is conceivable to perform idle stop control that automatically stops the engine when the vehicle stops. However, it has been found that in this case, the automatic engine stop and the automatic restart are frequently repeated, which may cause trouble for the driver. Specifically, when the preceding vehicle frequently starts and stops while following the preceding vehicle during a traffic jam, the host vehicle frequently starts and stops accordingly. As a result, automatic stop and automatic restart of the engine due to idle stop are frequently repeated in the host vehicle.
  For this reason, when the vehicle is following the preceding vehicle during a traffic jam, it may be possible to uniformly prohibit the automatic stop of the engine by the idle stop. However, in this case, the engine is not automatically stopped due to idle stop during a traffic jam, which is not preferable for improving fuel efficiency.
In particular, even when the vehicle is traveling in the same traffic jam state, depending on the preceding vehicle (the driver's driving wheel), the start and stop may be repeated frequently or not.
Specifically, during a traffic jam, depending on the preceding vehicle, there is a strong tendency to start immediately in response to the forward movement of the preceding vehicle located immediately before the preceding vehicle. Parking is frequently repeated. On the other hand, depending on the preceding vehicle, there is a strong tendency to start after waiting for the forward vehicle to move forward to some extent without immediately moving forward even if the forward vehicle located immediately before the preceding vehicle moves forward. In this case, frequent starting and stopping are unlikely to occur.
  The present invention has been made in consideration of the above circumstances, and its purpose is to secure an opportunity to automatically stop the engine by idle stop when traveling following a preceding vehicle during a traffic jam. However, it is an object of the present invention to provide an active cruise control device capable of preventing a situation in which automatic engine stop and automatic restart due to idle stop are frequently repeated.
In order to achieve the above object, the following solution is adopted in the present invention. That is, as described in claim 1,
An active cruise control device that follows a preceding vehicle,
Idle stop control means for automatically stopping the engine, assuming that the vehicle is at a stop,
A traffic jam detection means for detecting that the vehicle is running in a traffic jam situation;
Travel pattern learning means for learning a travel pattern related to starting and stopping of a preceding vehicle when it is detected that the traffic traveling is detected by the traffic traveling detection means;
The execution condition is changed so that the automatic stop of the engine by the idle stop control unit is suppressed when the traveling pattern learning unit learns that the preceding vehicle is a traveling pattern in which the vehicle starts and stops frequently. Execution condition changing means;
It is supposed to be equipped with.
According to the above-described solution method, during a traffic jam, a travel pattern related to the start and stop of the preceding vehicle is learned, and an execution condition for the automatic engine stop by the idle stop is determined according to the learned travel pattern of the preceding vehicle. Since the change is made, fuel efficiency can be improved by securing an opportunity to automatically stop the engine by idle stop even in a traffic jam. In addition, when the vehicle is frequently stopped and stopped, the automatic stop of the engine due to the idle stop is suppressed (for example, prohibited) to ensure that the automatic stop and automatic restart of the engine are frequently repeated. Can be prevented.
A preferred mode based on the above solution is as described in claim 2 and the following claims. That is,
When the traveling pattern learning means learns that the preceding vehicle is a traveling pattern in which the vehicle starts and stops frequently, the execution condition changing means prohibits automatic stop of the engine due to idle stop ( (Corresponding to claim 2). In this case, when the traveling pattern of the preceding vehicle is a situation in which the automatic stop and the automatic restart of the engine are frequently repeated for the host vehicle, the automatic stop and the automatic restart of the engine are prohibited by prohibiting the automatic stop of the engine. Can be prevented from being repeated frequently.
  When the travel pattern learning means learns that the preceding vehicle is a travel pattern that repeats starting and stopping a predetermined number of times or more within a predetermined time, the execution condition changing means prohibits the engine from being automatically stopped by idle stop. (Claim 3). In this case, a specific determination method is provided for determining that the engine is automatically stopped and restarted frequently, and this determination can be made with high accuracy. The corresponding effects can be obtained together.
The travel pattern learned by the travel pattern learning means is cleared when the direction indicator of the preceding vehicle is actuated (corresponding to claim 4). In this case, when the direction indicator of the preceding vehicle is activated, it is very likely that the preceding vehicle will change because the preceding vehicle will change lanes or turn right or left in the near future. This is preferable for clearing (discarding) the travel pattern and learning the travel pattern for the new preceding vehicle at an early stage.
When the travel pattern learning means learns that the preceding vehicle is a travel pattern that frequently starts and stops, the execution condition changing means delays the timing for automatically stopping the engine. Yes (corresponding to claim 5).
In addition, when the travel pattern learning means learns that the preceding vehicle is a travel pattern in which the vehicle starts and stops frequently, the execution condition changing means can stop the engine without stopping the engine automatically every stop. It is also possible to automatically stop the engine when it is repeated a number of times (corresponding to claim 6).
  According to the present invention, it is possible to prevent a situation in which an automatic stop and an automatic restart of an engine due to an idle stop are frequently repeated while securing an opportunity to perform an automatic stop of the engine by an idle stop during a traffic jam. Can do.
The simplified top view which shows the condition in traffic driving. The figure which shows an example of the driving | running | working pattern which does not repeat a start and a stop frequently during traffic congestion driving | running | working. The figure which shows an example of the driving | running | working pattern which repeats start and a stop frequently during heavy traffic driving. FIG. 3 is a block diagram showing an example of a control system of the present invention. The flowchart which shows the example of control of this invention.
  In FIG. 1, V is the host vehicle, and VA is a preceding vehicle located immediately before the host vehicle V. Front vehicles positioned further ahead of the preceding vehicle VA are denoted by reference numerals VB1 and VB2. FIG. 1 shows a situation where the vehicle is traveling in a traffic jam, and the vehicles VA, VB1, and VB2 are in a stopped state. The host vehicle V is in a state immediately before stopping while the host vehicle V is approaching the preceding vehicle VA.
  The own vehicle V is equipped with an active cruise control device, and the engine output and the brake are automatically controlled so as to follow the preceding vehicle VA. The host vehicle V is equipped with an idle stop control device so that the engine is automatically stopped when the vehicle is stopped, and the engine is automatically restarted when the restart condition is satisfied.
  Next, FIG. 2 and FIG. 3 show examples of travel patterns related to the start and stop of the preceding vehicle VA during traveling in a traffic jam. The traveling pattern shown in FIG. 2 is a pattern in which the frequency of starting and stopping within a certain predetermined time is low. On the other hand, the running pattern shown in FIG. 3 is a pattern in which the frequency of starting and stopping within a certain predetermined time is high.
  When the preceding vehicle VA has a travel pattern as shown in FIG. 2, the automatic stop and the automatic restart of the engine due to the idle stop are not frequently repeated in the own vehicle V that follows this. Even if the engine is automatically stopped by idle stop when the host vehicle V stops according to the stop of the vehicle VA, there is no particular problem. On the other hand, when the preceding vehicle VA has a travel pattern as shown in FIG. 3, the vehicle V following this frequently repeats automatic engine stop and automatic restart due to idle stop. In this case, the passenger of the own vehicle V is bothered.
  In the present invention, when the traveling pattern of the preceding vehicle VA is as shown in FIG. 2, for example, automatic engine stop by idle stop is executed (permitted) when the vehicle stops. On the other hand, when the traveling pattern of the preceding vehicle VA is as shown in FIG. 3, for example, automatic engine stop by idle stop is prohibited when the vehicle stops.
  FIG. 4 is a block diagram illustrating an example of a control system configured in the host vehicle V. In the figure, U is a controller (control unit) configured using a microcomputer. The controller U controls the automatic stop and automatic restart of the engine by active cruise control control and idle stop control for following the preceding vehicle, and is connected to various sensors and devices S1 to S7. In the embodiment, the active cruise control control can be performed over the entire vehicle speed range (range from the vehicle speed 0 to the maximum vehicle speed), but the vehicle speed from a predetermined vehicle speed (for example, 120 km / h) smaller than the maximum vehicle speed. It can be executed only in a limited vehicle speed range up to zero.
  S1 is an inter-vehicle distance detecting means for detecting an inter-vehicle distance LV with respect to the preceding vehicle VA, and is constituted by, for example, a millimeter wave radar. S2 is a camera as an imaging means for confirming the state of the preceding vehicle VA, and in particular detects a stop of the preceding vehicle VA. S3 is a vehicle speed sensor that detects the vehicle speed. S4 is a main switch of the active cruise control device. S5 is an inter-vehicle distance setting switch for changing the inter-vehicle distance with the preceding vehicle VA by manual operation when the main switch S4 is turned on and the active cruise control device is operated. The set inter-vehicle distance is set as the vehicle head time. That is, the vehicle head time is the time from when the preceding vehicle VA passes a certain position to when the host vehicle V passes a certain point. For example, when the vehicle head time is set to 2.5 seconds, it is 100 km / h. The distance between the vehicles is about 70 m when traveling. Even if the head time is the same, the smaller the vehicle speed of the host vehicle V, the more the vehicle follows the vehicle with a smaller inter-vehicle distance than the preceding vehicle VA. Note that the inter-vehicle distance during follow-up travel can always be automatically set so that it cannot be changed by manual operation.
  S6 is a brake control means (automatic brake means) for automatically operating the brake. S7 is output control means for automatically controlling engine output (engine torque).
  FIG. 5 is a flowchart showing an example of control by the controller U. This flowchart will be described below. In the following description, Q indicates a step, and the main switch S4 is turned on so that the active cruise control device is operating. Further, a switch (not shown) for giving an instruction to execute idle stop control is also turned on.
  First, in Q1, signals from various sensors shown in FIG. 2 are read. Next, at Q2, it is determined whether or not the current traveling state is a congested traveling state. The determination in Q2 is, for example, when the host vehicle V is running in a traffic jam when the average speed of the host vehicle V within a predetermined time is equal to or lower than the predetermined vehicle speed and the number of vehicles ahead of the host vehicle V is equal to or higher than the predetermined number. It can be determined that In addition to this, the determination at Q2 also determines that the vehicle is traveling in a congested state when the average vehicle speed of the host vehicle V is equal to or lower than the predetermined vehicle speed and the number of starts and stops is equal to or higher than the predetermined number of times within a predetermined time. Or by determining that the vehicle is traveling in a traffic jam based on the traffic jam information obtained from the navigation device.
  If the determination in Q2 is YES, it is determined in Q3 whether or not the direction indicator of the preceding vehicle VA is inactive (whether or not the blinker blinks). The determination in Q3 can be performed by, for example, taking an image with the imaging unit S2 and analyzing the image.
  When the determination at Q3 is YES, the preceding vehicle VA continues to exist as the preceding vehicle VA as before. At this time, in Q4, a travel pattern related to starting and stopping of the preceding vehicle VA is learned (for example, learning for obtaining a travel pattern as shown in FIGS. 2 and 3). Starting and stopping of the preceding vehicle VA can be determined, for example, that the preceding vehicle VA is stopped when the surrounding environment of the preceding vehicle VA is not changed in the image captured by the imaging unit S2. It can be determined that the vehicle has started when the surrounding environment starts to change from the state. Further, when the vehicle speed of the host vehicle V detected by the vehicle speed sensor S3 and the relative speed obtained from the change in the inter-vehicle distance with respect to the preceding vehicle VA are the same, it can be determined that the preceding vehicle VA is stopped. In this state, it can be determined that the vehicle has started when the relative speed becomes lower than the vehicle speed of the host vehicle V. It should be noted that the start and stop of the preceding vehicle VA can be determined by an appropriate method other than the above.
  After Q4, at Q5, it is determined based on the travel pattern learned at Q4 whether or not the number of starts and stops of the preceding vehicle VA within a predetermined time is n or more. Specifically, for example, whether or not the start / stop within 15 seconds (corresponding to the predetermined time) is equal to or more than two times (corresponding to n) or more, for example, start within 30 seconds or longer. A determination is made as to whether or not the number of stops is four or more.
  If the determination in Q5 is YES, the process proceeds to Q6, where it is assumed that the engine is automatically stopped and automatically restarted by idling stop, and idling stop is prohibited (engine idling by idling stop). Prohibition of automatic stop of). On the other hand, if the determination in Q5 is NO, it means that the engine is not automatically stopped and automatically restarted by idling stop, so that the process shifts to Q7 and the engine is automatically stopped by idling stop. Is done. Of course, the automatic engine stop by the idle stop is executed when the host vehicle V stops.
  If NO in the determination of Q2 or NO in the determination of Q3, the process proceeds to Q8, and the travel pattern of the preceding vehicle VA being learned is cleared (discarded).
  Although the embodiments have been described above, the present invention is not limited to the embodiments, and appropriate modifications can be made within the scope of the claims. When it is learned that the preceding vehicle is a traveling pattern in which the vehicle starts and stops frequently, the timing for starting the automatic engine stop by the idle stop is delayed, or the engine is automatically stopped by the idle stop every stop. Rather than performing the stop, the engine can be automatically stopped by idle stop when the stop is repeated a certain number of times (for example, when the number of times is set to twice, the engine is idle every other stop). The engine is automatically stopped by the stop). Of course, the object of the present invention is not limited to what is explicitly stated, but also implicitly includes providing what is substantially preferred or expressed as an advantage.
  The present invention frequently repeats the automatic engine stop and the automatic restart while ensuring the opportunity to automatically stop the engine by idle stop when traveling following a preceding vehicle during a traffic jam. Can be prevented.
V: host vehicle VA: preceding vehicle VB1: forward vehicle VB2: forward vehicle U: controller S1: inter-vehicle distance detection means S2: imaging means S3: vehicle speed sensor S4: main switch S5: inter-vehicle distance setting switch S6: brake control means S7: Engine output control means

Claims (6)

  1. An active cruise control device that follows a preceding vehicle,
    Idle stop control means for automatically stopping the engine, assuming that the vehicle is at a stop,
    A traffic jam detection means for detecting that the vehicle is running in a traffic jam situation;
    Travel pattern learning means for learning a travel pattern related to starting and stopping of a preceding vehicle when it is detected that the traffic traveling is detected by the traffic traveling detection means;
    The execution condition is changed so that the automatic stop of the engine by the idle stop control unit is suppressed when the traveling pattern learning unit learns that the preceding vehicle is a traveling pattern in which the vehicle starts and stops frequently. Execution condition changing means;
    An active cruise control device characterized by comprising:
  2. In claim 1,
    When the travel pattern learning means learns that the preceding vehicle is a travel pattern in which the vehicle starts and stops frequently, the execution condition changing means prohibits automatic engine stop by idle stop. Active cruise control device.
  3. In claim 2,
    When the travel pattern learning means learns that the preceding vehicle is a travel pattern that repeats starting and stopping a predetermined number of times or more within a predetermined time, the execution condition changing means prohibits the engine from being automatically stopped by idle stop. , active cruise control equipment, characterized in that.
  4. In any one of Claims 1 thru | or 3,
    An active cruise control device characterized in that the travel pattern learned by the travel pattern learning means is cleared when the direction indicator of the preceding vehicle is actuated.
  5. In claim 1,
      When the traveling pattern learning means learns that the preceding vehicle is a traveling pattern that frequently starts and stops, the execution condition changing means delays the timing for automatically stopping the engine. Active cruise control device.
  6. In claim 1,
      When the traveling pattern learning means learns that the preceding vehicle is a traveling pattern in which the vehicle starts and stops frequently, the execution condition changing means repeats stopping a plurality of times without automatically stopping the engine every stop. An active cruise control device characterized in that the engine is automatically stopped at a specified time.
JP2014016766A 2014-01-31 2014-01-31 Active cruise control device Active JP6241298B2 (en)

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Publication number Priority date Publication date Assignee Title
CN106428008B (en) * 2016-06-08 2020-02-18 华南理工大学 Self-adaptive control method for automobile start-stop system
KR102225748B1 (en) * 2019-09-03 2021-03-11 한국과학기술원 Electronic apparatus for intelligent idle stop and go control using traffic congestion condition and operting method thereof

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Publication number Priority date Publication date Assignee Title
JPH10166894A (en) * 1996-12-05 1998-06-23 Mitsubishi Electric Corp Follow-up traveling controller for vehicle
JP2001107769A (en) * 1999-10-04 2001-04-17 Honda Motor Co Ltd Engine control device
JP2012206593A (en) * 2011-03-29 2012-10-25 Fuji Heavy Ind Ltd Cruise control system

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