JP2015090131A - Control device and control method of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device of a vehicle free from degradation of drivability even when limiting vehicle speed.SOLUTION: A control device 1 executing control so that vehicle speed is not over target vehicle speed on a flat road or a road of ascending inclination, includes a vehicle speed information storing portion 10 collecting information on the vehicle speed when the vehicle speed is not zero, and successively updating the target vehicle speed on the basis of the collected information on the vehicle speed until the time obtained by integrating the time when the vehicle speed is not zero, reaches a prescribed time, and an average value/maximum value calculating portion 11.

Description

  The present invention relates to a vehicle control device and a control method.

  There is control (referred to as eco-run control) that limits the acceleration of the vehicle in order to improve the fuel efficiency of the vehicle (see, for example, Patent Document 1). In the eco-run control, the fuel supply amount of the engine is controlled so as to keep the vehicle acceleration below a limit value.

JP2013-19275A

  When the eco-run control as described above is performed, the acceleration of the vehicle is suppressed against the driver's will. This reduces drivability. In Patent Document 1, in order to improve the driver's stress due to a decrease in drivability, the actual accelerator opening and the accelerator opening estimated from the current depression amount of the accelerator pedal are displayed. However, this does not lead to an improvement in drivability, so that the driver spends more time operating the eco-run control in the OFF state, and the effect of improving the fuel consumption, which is the initial objective, is reduced.

  An object of the present invention is to provide a vehicle control device in which drivability does not decrease even when acceleration is limited.

  The present invention relates to a vehicle control apparatus for controlling a vehicle speed on a flat road or an uphill road so as not to exceed a target vehicle speed, collecting vehicle speed information when the vehicle speed is not zero, and a time when the vehicle speed is not zero. There is a control means for sequentially updating the target vehicle speed based on the information on the vehicle speed collected until the predetermined time reaches the predetermined time.

  For example, the control means can set the maximum value of the vehicle speed within a predetermined time as the target vehicle speed, and can perform acceleration restriction when the vehicle speed exceeds the average value of the vehicle speed within the predetermined time.

  Further, the control means can reset the target vehicle speed based on the vehicle position information.

  Another aspect of the present invention is a viewpoint as a control method. The present invention relates to a control method executed by a vehicle control device that performs control so that the vehicle speed on a flat road or an uphill road does not exceed a target vehicle speed. When the vehicle speed is not zero, the vehicle speed information is collected and the vehicle speed is zero. The step of sequentially updating the target vehicle speed based on the vehicle speed information collected until the time when the accumulated time reaches the predetermined time is obtained.

  For example, in the process of the control step, the maximum value of the vehicle speed within a predetermined time can be set as the target vehicle speed, and the acceleration can be limited when the vehicle speed exceeds the average value of the vehicle speed within the predetermined time.

  Furthermore, the process of the control step can reset the target vehicle speed based on the vehicle position information.

  According to the present invention, it is possible to provide a vehicle control device in which drivability does not decrease even when the vehicle speed is limited.

It is a block block diagram of the control apparatus which concerns on 1st embodiment of this invention. It is a flowchart which shows operation | movement of the vehicle speed information storage part of the control apparatus of FIG. 1, and an average value / maximum value calculation part. It is a flowchart which shows operation | movement of the acceleration limiting part of the control apparatus of FIG. It is a figure for demonstrating the setting of the target vehicle speed in the control apparatus of FIG. 1 in time series. It is a figure which shows the change of the vehicle speed when the acceleration control of the control apparatus of FIG. 1 is implemented with the comparative example. It is a block block diagram of the control apparatus which concerns on 2nd embodiment of this invention. It is a flowchart which shows operation | movement of the vehicle speed information storage part and the average value / maximum value calculation part in the control apparatus of FIG. It is a figure for demonstrating the setting of the target vehicle speed in the control apparatus of FIG. 6 in time series.

(First embodiment)
A control device 1 according to a first embodiment of the present invention will be described with reference to FIGS. The control device 1 is mounted on a vehicle (not shown), and controls the acceleration of the vehicle by controlling the fuel injection amount of the engine 10. Thereby, the control apparatus 1 performs a speed control process so that the vehicle speed of the vehicle does not exceed the target vehicle speed. This speed control process is performed when the vehicle is accelerated by the output of the engine 10.

  As shown in FIG. 1, the configuration of the control device 1 includes a vehicle speed information storage unit 10, an average value / maximum value calculation unit 11, and an acceleration limiting unit 12. The vehicle speed information storage unit 10 acquires vehicle speed information from a vehicle speed sensor or the like of the vehicle, and collects and stores vehicle speed information when the vehicle speed is not zero. The average value / maximum value calculation unit 11 collects the vehicle speed when the vehicle speed stored in the vehicle speed information storage unit 10 is not zero until the time obtained by adding the times when the vehicle speed is not zero reaches a predetermined time. Based on this information, the average and maximum vehicle speed are calculated.

  The acceleration limiting unit 12 limits the acceleration of the vehicle based on the average value and the maximum value of the vehicle speed within a predetermined time calculated by the average value / maximum value calculation unit 11.

  Next, operations of the vehicle speed information storage unit 10 and the average / maximum value calculation unit 11 will be described with reference to the flowchart of FIG. The START condition in the flowchart of FIG. 2 is that the vehicle key switch is in the ON state. If the START condition is satisfied, the process proceeds to step S1. Note that the flowchart in FIG. 2 is processing for one cycle, and when the processing ends (END) and the START condition is satisfied, the processing is executed again.

  In step S1, when the vehicle speed information storage unit 10 stores the vehicle speed information when the vehicle speed is not zero, the process proceeds to step S2.

  In step S <b> 2, the average / maximum value calculation unit 11 determines whether or not a predetermined time has elapsed from the time when the vehicle speed is not zero. If it is determined in step S2 that the predetermined time has elapsed, the process proceeds to step S3. On the other hand, if it is determined in step S2 that the predetermined time has not elapsed, the process returns to step S1.

  In step S <b> 3, the average value / maximum value calculation unit 11 calculates the average value and the maximum value from the vehicle speed information within a predetermined time received from the vehicle speed storage unit 10, and ends the process for one cycle.

  Next, the operation of the acceleration limiting unit 12 will be described with reference to the flowchart of FIG. The START conditions in the flowchart of FIG. 3 are the same as the START conditions in the flowchart of FIG. If the START condition is satisfied, the process proceeds to step S1. Note that the flowchart in FIG. 3 is processing for one cycle, and when the processing ends (END) and the START condition is satisfied, the processing is executed again.

  In step S <b> 10, the acceleration limiting unit 12 determines whether the current vehicle speed is equal to or higher than the average value calculated by the average value / maximum value calculation unit 11. If it is determined in step S10 that the average value is greater than or equal to, the process proceeds to step S11. On the other hand, if it is determined in step S10 that it is less than the average value, the process repeats step S10.

  In step S11, the acceleration limiting unit 12 performs acceleration limitation, and the process proceeds to step S12.

  In step S12, the acceleration limiting unit 12 determines whether or not the accelerator pedal depression amount is equal to or greater than a threshold value. If it is determined in step S12 that the accelerator pedal depression amount is greater than or equal to the threshold value, the process proceeds to step S13. On the other hand, if it is determined in step S12 that the accelerator pedal depression amount is less than the threshold value, the process returns to step S10.

  In step S13, the acceleration limiting unit 12 cancels the acceleration limitation and ends the processing for one cycle (END).

  Next, the operation of the control device 1 will be described with reference to FIGS. The vehicle speed information storage unit 10 stores vehicle speed information of the vehicle at a predetermined time T1 during which the vehicle speed is not zero. The average value / maximum value calculation unit 11 calculates an average value and a maximum value of the vehicle speed based on the vehicle speed information stored in the vehicle speed information storage unit 10 within a predetermined time T1. Thereafter, the average value / maximum value calculating unit 11 sets the maximum value of the vehicle speed as the target vehicle speed Vd1 in the acceleration limiting unit 12 and sets the average value of the vehicle speed as the acceleration limiting start speed in the acceleration limiting unit 12. Similarly, the vehicle speed information storage unit 10 stores vehicle speed information of the vehicle at a predetermined time T2 shown in FIG. The average value / maximum value calculation unit 11 calculates the average value and the maximum value of the vehicle speed based on the vehicle speed information stored in the vehicle speed information storage unit 10 within the predetermined time T2. Thereafter, the average value / maximum value calculation unit 11 sets the maximum value of the vehicle speed as the target vehicle speed Vd2 in the acceleration limiting unit 12, and sets the average value of the vehicle speed as the acceleration limiting start speed in the acceleration limiting unit 12. The same applies to the predetermined time T3 and thereafter.

  As described above, since the control device 1 performs the acceleration limitation at a value equal to or higher than the average value of the vehicle speed within a predetermined time, the acceleration limitation is not performed when the vehicle speed is relatively low such as when the vehicle starts. Furthermore, as the vehicle speed increases, the average value and the maximum value of the vehicle speed also increase, so that the driver does not feel uncomfortable with the acceleration limitation. According to this, the driver travels in the ON state without operating the eco-run control in the OFF state, and drivability can be prevented from being lowered even if the vehicle speed is limited. As shown in steps S12 and S13 of FIG. 3, when the accelerator pedal depression amount is equal to or greater than the threshold value, the acceleration restriction is released.

  FIG. 5 shows a comparative example without acceleration limitation by an alternate long and short dash line. As shown in FIG. 5, when the acceleration is not limited, the vehicle speed changes in a wavy manner unless the driver pays close attention to the operation of the accelerator pedal. On the other hand, by limiting the acceleration, the vehicle speed does not exceed the target vehicle speed without the driver paying careful attention to the operation of the accelerator pedal, and the fuel efficiency is improved. In addition, since the acceleration is limited from the average value of the vehicle speed within a predetermined time, the acceleration is not limited during the start of the vehicle or during the acceleration immediately after the start, and the driver's drivability is good. Further, the acceleration limit start vehicle speed and the target vehicle speed are updated every predetermined time. According to this, since the appropriate acceleration limit start vehicle speed and target vehicle speed are set in the environment in which the vehicle is currently traveling, the drivability of the driver is further improved.

(Second embodiment)
A control device 1A according to a second embodiment of the present invention will be described with reference to FIG. The control device 1A is partially different from the control device 1. In the following description, the same members as those of the control device 1 are denoted by the same reference numerals as those of the control device 1. Specifically, the control device 1A is different from the control device 1 in the vehicle speed information storage unit 10A.

  The vehicle speed information storage unit 10A determines the necessity of resetting the storage of the vehicle speed information based on the position information or the inter-vehicle information even within the predetermined time. For example, at a toll gate or interchange on an expressway, the driving environment of the vehicle changes greatly from that point. That is, when entering a highway from a general road, or when getting off a general road from a highway, the legal speed changes greatly. For this reason, it is necessary to reset the storage of vehicle speed information at tollgates or interchanges on highways. The position information can be acquired by a car navigation system, a VICS (Vehicle Information and Communication system), or the like.

  Further, the distance between the vehicles is relatively long if the traffic volume is low and the vehicle can travel at the legal speed, but the distance between the vehicles is relatively short if the vehicle is in an environment where the vehicle is forced to travel at a low speed in a traffic jam. As described above, there is a case where it is necessary to reset the storage of the vehicle speed information even if the inter-vehicle distance changes. The information on the inter-vehicle distance can be acquired by a radar device for monitoring the front of the vehicle.

  Next, operations of the vehicle speed information storage unit 10A and the average / maximum value calculation unit 11 of the control device 1A of FIG. 6 will be described with reference to the flowchart of FIG. The START conditions in the flowchart of FIG. 7 are the same as the START conditions in the flowchart of FIG. If the START condition is satisfied, the process proceeds to step S20. Note that the flowchart in FIG. 7 is a process for one cycle, and when the process is completed (END), if the START condition is satisfied, the process is executed again.

  In step S20, when the vehicle speed information storage unit 10A stores the vehicle speed information when the vehicle speed is not zero, the process proceeds to step S21.

  In step S21, the vehicle speed information storage unit 10A determines whether or not a predetermined time has elapsed. If it is determined in step S21 that the predetermined time has elapsed, the process proceeds to step S22. On the other hand, if it is determined in step S21 that the predetermined time has not elapsed, the process proceeds to step S23.

  In step S22, the average value / maximum value calculation unit 11 calculates the average value and the maximum value from the vehicle speed information within a predetermined time received from the vehicle speed storage unit 10A, and ends the process for one cycle.

  In step S23, the vehicle speed information storage unit 10A determines whether or not a reset is necessary. If it is determined in step S23 that reset is necessary, the process proceeds to step S24. On the other hand, if it is determined in step S23 that no reset is necessary, the process returns to step S20.

  In step S24, the vehicle speed information storage unit 10A resets the vehicle speed information and returns to step S20.

  According to the processing of the flowchart of FIG. 7, as shown in FIG. 8, when a reset occurs during the predetermined time T2a, the vehicle speed information stored at the predetermined time T2a is discarded and the vehicle speed information is stored at the predetermined time T3. To start. Simultaneously with the occurrence of the reset, the target vehicle speed Vd1a is also canceled. It should be noted that the target vehicle speed is not set until the storage of the vehicle speed information at the predetermined time T3 and the setting of the target vehicle speed Vd3 based on this storage are completed.

  According to this, the setting of the acceleration limiting unit 12 can be changed with a sudden change in the traveling environment. As a result, there is no acceleration limitation at a low vehicle speed when traveling on a general road despite entering the highway from the general road, and the drivability of the driver can be improved. On the other hand, the acceleration limitation at the high vehicle speed when driving on the highway despite getting off from the highway to the general road remains as it is, so that the acceleration limitation is not substantially performed and the fuel efficiency is improved. be able to.

  In addition, there is no limitation in particular about the classification of the vehicle of the above-mentioned embodiment. However, a higher effect can be expected by applying the control devices 1 and 1A to a diesel engine vehicle or a hybrid vehicle with high acceleration performance.

  The control devices 1 and 1A described above can be realized by executing a predetermined program in which the information processing device is installed in advance. Such an information processing apparatus has, for example, a memory, a CPU (Central Processing Unit), an input / output port, and the like. The CPU of the information processing apparatus reads and executes a control program as a predetermined program from a memory or the like. Thereby, the function of the control device 5 is realized in the information processing apparatus. An ASIC (Application Specific Integrated Circuit), a microprocessor (microcomputer), a DSP (Digital Signal Processor), or the like may be used instead of the CPU.

  Further, even if the above-mentioned predetermined program is stored in the memory of the information processing apparatus before shipment of the control devices 1 and 1A, the memory of the information processing device and the like after shipment of the control devices 1 and 1A. May be stored in the memory. Further, a part of the program may be stored in the memory of the information processing apparatus after shipment of the control devices 1 and 1A. The program stored in the memory or the like of the information processing apparatus after shipment of the control device 1 or 1A may be, for example, an installed program stored in a computer-readable recording medium such as a CD-ROM. What was downloaded via transmission media, such as the internet, may be installed.

  The predetermined program described above includes not only a program that can be directly executed by the information processing apparatus but also a program that can be executed by being installed on a hard disk or the like. Also included are those that are compressed or encrypted.

  As described above, by realizing the control devices 1 and 1A by the information processing device and the program, it becomes possible to flexibly cope with mass production and specification change (or design change).

  Note that the program executed by the information processing apparatus may be a program that is processed in time series in the order described in this specification, or may be necessary in parallel or when a call is made. It may be a program that performs processing at timing.

DESCRIPTION OF SYMBOLS 1,1A ... Control apparatus (control means) 10, 10A ... Vehicle speed information storage part (a part of control means), 11 ... Average value / maximum value calculation part (a part of control means), 12 ... Acceleration limiting part ( Part of control means)

Claims (6)

In a vehicle control device that controls a vehicle speed on a flat road or an uphill road so as not to exceed a target vehicle speed,
Vehicle speed information is collected when the vehicle speed is not zero, and the target vehicle speed is sequentially updated based on the collected vehicle speed information until the time when the time when the vehicle speed is not zero is accumulated reaches a predetermined time. Having control means to
A control device characterized by that. The control device according to claim 1,
The control means sets the maximum value of the vehicle speed within the predetermined time as the target vehicle speed, and implements acceleration limitation when the vehicle speed exceeds the average value of the vehicle speed within the predetermined time.
A control device characterized by that. The control device according to claim 1 or 2,
The control means resets the target vehicle speed based on vehicle position information.
A control device characterized by that. In a control method executed by a vehicle control device that controls a vehicle speed on a flat road or an uphill road so as not to exceed a target vehicle speed,
Vehicle speed information is collected when the vehicle speed is not zero, and the target vehicle speed is sequentially updated based on the collected vehicle speed information until the time when the time when the vehicle speed is not zero is accumulated reaches a predetermined time. Having a step to
A control method characterized by that. The control method according to claim 4, wherein
The process of the control step sets the maximum value of the vehicle speed within the predetermined time as the target vehicle speed, and implements acceleration limitation when the vehicle speed exceeds the average value of the vehicle speed within the predetermined time.
A control method characterized by that. The control method according to claim 4 or 5,
The process of the control step resets the target vehicle speed based on vehicle position information.
A control method characterized by that.

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