JP2008063944A - Throttle opening degree control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a throttle opening degree control device making a switch to throttle opening degree characteristics satisfying a driver's intention, i.e., a prompt switch to a throttle opening degree characteristic requiring rapid acceleration and a slow switch to a throttle opening degree characteristic not requiring rapid acceleration. <P>SOLUTION: The throttle opening degree control device 10 for an engine performs switching control of a first throttle opening degree characteristic in which a throttle is opened at a predetermined opening degree with respect to a predetermined accelerator opening degree and a second throttle opening degree characteristic in which the throttle is opened at an opening degree larger than the opening degree decided by the first throttle opening degree characteristic with respect to the same accelerator opening degree. A time change rate of the throttle opening degree when switching from the first throttle opening degree characteristic to the second throttle opening degree characteristic is larger than a time change rate of the throttle opening degree when switching from the second throttle opening degree characteristic to the first throttle opening degree characteristic. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a throttle opening control device that switches two throttle opening characteristics having different rates of change in throttle opening with respect to changes in accelerator opening.

  Conventionally, depending on the driving conditions of the vehicle, there are a plurality of driving characteristics in which the correspondence relationship of the throttle opening to the accelerator opening is different, and from the slow mode where the driver has slow acceleration to the active mode with good acceleration. When it is determined that the driver wants to change the vehicle based on the degree of change in the accelerator position of the driver and its average value, the mode changes from the slow mode to the active mode, ensuring responsive acceleration and smooth driving. A technique with improved safety and safety is known (see, for example, Patent Document 1).

In addition, regarding the change in the throttle opening characteristics associated with the change in the gear position, when shifting up, the throttle opening degree according to the gear position after the change from the throttle opening degree according to the gear position before the change based on a small change rate Slowly change until the transition acceleration is suppressed, and at the time of downshift, based on a large change rate, quickly change from the throttle opening according to the gear position before the change to the throttle opening after the change, A technique is known in which a sense of incongruity associated with the time difference between the engine rotation blow-up and the engine rotation drop is suppressed (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 3-107669 JP 2003-214220 A

  However, the invention described in the above-mentioned Patent Document 1 does not disclose a specific transition method when shifting from the slow mode to the active mode, and does not take into consideration any problems associated with the transition of running characteristics. .

  Further, in the invention described in Patent Document 2 described above, attention is focused on how to smoothly change the gear stage to reduce the user's uncomfortable feeling before reaching the target throttle opening of the target gear stage. Therefore, there is no intention or disclosure of switching and using different throttle opening characteristics according to the driving conditions.

  By the way, in recent years, for the purpose of environmental protection, from the viewpoint of recommending vehicles and driving with reduced exhaust gas, for example, an eco-switch called throttle opening for throttle opening with respect to accelerator opening is suppressed compared to normal driving conditions. There has been proposed a vehicle that can be controlled to be switched to a mode that travels with a degree characteristic. In such a driving mode, there is no problem during stable driving.For example, when sudden acceleration is required to avoid danger, even if the accelerator is depressed and the accelerator opening is raised, the throttle opening remains normal. There is a problem that the vehicle does not go up like the driving mode and cannot be accelerated as the user thinks.

  Therefore, the present invention is, for example, an environment-friendly throttle valve that has a throttle opening characteristic that suppresses the throttle opening with respect to the accelerator opening. It is an object of the present invention to provide a throttle opening control device that quickly switches to a throttle opening characteristic having a large opening and ensures user safety.

In order to achieve the above object, the throttle opening control device according to the first invention has the same accelerator opening as the first throttle opening characteristic for opening the throttle at a predetermined opening relative to the predetermined accelerator opening. On the other hand, an engine throttle opening control device that performs switching control with a second throttle opening characteristic that opens the throttle at an opening larger than the opening indicated by the first throttle opening characteristic,
The time change rate of the throttle opening at the time of switching from the first throttle opening characteristic to the second throttle opening characteristic is the throttle at the time of switching from the second throttle opening characteristic to the first throttle opening characteristic. It is characterized by being larger than the time change rate of the opening. As a result, it is possible to quickly switch to the second throttle opening characteristic having a large throttle opening in an emergency requiring rapid acceleration, and conversely switch slowly to the throttle opening characteristic without feeling uncomfortable when rapid acceleration is not required.

2nd invention is the throttle opening control apparatus which concerns on 1st invention,
The throttle opening control device includes intention determination means for determining the driver's intention. When the intention determination means determines that the driver has an intention to accelerate in the state of the first throttle opening characteristic, the throttle opening control device Switching from one throttle opening characteristic to the second throttle opening characteristic is performed. Thereby, the throttle opening characteristic can be switched based on the driver's intention to accelerate, and the driver's intention can be met when sudden acceleration is required.

3rd invention is the throttle opening control apparatus which concerns on 2nd invention,
When the intention determining means determines that the driver no longer intends to accelerate in the state of the second throttle opening characteristic, the throttle opening control device determines the first throttle opening from the second throttle opening characteristic. Switching to characteristics is performed. As a result, when the driver's intention to accelerate is lost, the throttle opening characteristic with a small throttle opening can be restored, and the earth-friendly traveling can be performed.

4th invention is the throttle opening control apparatus which concerns on 2nd or 3rd invention,
The intention determination means determines whether or not the driver intends to accelerate based on history data of the maximum accelerator opening of the driver's past driving. As a result, it is possible to determine the acceleration intention suitable for each driver having different personalities such as driving habits and customs, and it is possible to determine the intention of the driver with high reliability.

  According to the present invention, when switching to a throttle opening characteristic that requires rapid acceleration, it is quickly switched when switching to a throttle opening characteristic that does not require rapid acceleration, and the throttle opening characteristic that meets the driving needs of the driver. It is possible to provide a throttle opening control device that switches between the two.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a system configuration diagram illustrating an example of a throttle opening control device according to the present embodiment.

  The throttle opening control device 10 has two control modes based on the first throttle opening characteristic and the second throttle opening characteristic, and the characteristic is switched by the switching means 31. The eco switch 30 is a switch that allows these control modes to be switched according to the intention of the user. For example, the throttle opening control device 10 executes throttle opening control based on the second throttle opening characteristic when the eco switch 30 is OFF, and based on the first throttle opening characteristic when the eco switch 30 is ON. You may comprise so that throttle opening control may be performed.

  The throttle opening control device 10 is connected to an electronically controlled throttle motor 11, a throttle valve 12, and a throttle position sensor 13. The throttle position sensor 13 is a sensor that detects the position of the throttle valve 12 and thereby detects the throttle valve opening. On the other hand, the electronic control throttle motor 11 is a driving means for controlling the position of the throttle valve 12 and operates according to a command from the throttle opening degree control device 10. The throttle valve 12 is a valve that determines the throttle opening according to its position. In the present embodiment, the throttle opening control device 10 acquires information on the throttle opening from the throttle position sensor 13 so that the throttle opening changes based on the first throttle opening characteristic or the second throttle opening characteristic. Control is performed to switch between the two characteristics when necessary.

  The accelerator position sensor 23 is a sensor that detects the accelerator opening of the accelerator pedal 22. The throttle opening control device 10 is connected to an accelerator position sensor 23, from which information on the accelerator opening of the accelerator pedal 22 can be obtained.

  The throttle opening control device 10 includes intention determination means 20 as necessary. The intention determination unit 20 is a unit that determines whether or not the driver intends to accelerate, and performs determination based on the accelerator opening detected by the accelerator position sensor 23. Note that the intention determination unit 20 may include a history database 21 that accumulates history data related to the driver's past accelerator operation as necessary.

  In addition, the intention determination unit 20 can use communication information from an external center 60 such as GPS (Global Positioning System), VICS (Vehicle Information and Communication System), and G-BOOK as necessary. It may be connected to the communication information acquisition means 50. The communication information acquisition means 50 may include means necessary for acquiring communication information such as a receiving device and the antenna 51.

  Since the throttle opening control device 10 is configured as a calculation means for performing control, it may be embodied as a so-called ECU (Electric Control Unit). The ECU includes a CPU that performs various processes in accordance with a given execution program, a memory (for example, ROM, RAM, EEPROM, etc.) that stores the execution program of the CPU, calculation results, and the like, a timer, a counter, an input / output interface, and the like. Further, the control executed by the throttle opening control device 10 may be realized as a computer program, and can be realized using a given computer.

  Further, the throttle opening degree control device 10 may be incorporated or connected as a part of the engine control computer 40. The engine control computer 40 is a computer that controls an engine that is a power source of the vehicle. The engine control computer 40 performs control to drive the electronically controlled throttle motor 11 by determining the throttle opening degree suitable for the operating state based on the accelerator opening degree. Therefore, the throttle opening control apparatus 10 according to the present embodiment may be incorporated as part of the control performed by the engine control computer 40, or may be connected to the engine control computer 40 so as to be reflected in the control.

  FIG. 2 is a diagram illustrating a first throttle opening characteristic and a second throttle opening characteristic of the throttle opening control apparatus 10 according to the present embodiment. In FIG. 2, the horizontal axis represents the accelerator opening, and the vertical axis represents the throttle opening, that is, the torque, and the characteristic is expressed as the characteristic of the throttle opening with respect to the accelerator opening. The first throttle opening characteristic represents a non-linear curve with respect to the accelerator opening, and even when the accelerator opening is increased, the throttle opening is suppressed and the characteristic opens only slightly. This is, for example, a throttle opening characteristic that is set in order to suppress the throttle opening more than that during normal vehicle travel, and to suppress travel exhaust gas as much as possible to promote travel that is friendly to the earth.

  On the other hand, the characteristic curve in which the throttle opening is increased substantially linearly with the increase in the accelerator opening is the second throttle opening characteristic. This is a throttle opening characteristic when the ability of the engine is used as it is, and a torque approximately proportional to the depression of the accelerator can be obtained, which is a preferable characteristic when it is desired to perform rapid acceleration.

These throttle opening characteristics may be switched by a changeover switch or the like, for example, by a user's selection. In the throttle opening control apparatus according to the present embodiment, an example in which these throttle opening characteristics are switched by turning the eco switch 30 on and off has been described. However, the throttle opening is controlled by a switch based on another application or purpose. The degree characteristic may be switched.
FIG. 3 is a diagram for explaining an example of control in a transitional state at the time of switching between the first throttle opening characteristic curve and the second throttle opening characteristic curve. FIG. 3A is a diagram for explaining control of the throttle opening in a transitional state when switching from the first throttle opening characteristic to the second throttle opening characteristic.

  In FIG. 3 (a), it is assumed that control of the throttle opening relative to the accelerator opening is performed in units of a periodic clock pulse that drives the throttle opening control device. This may be considered as a period of about 0.001 to 0.1 seconds, for example, and here, a case where the period is 0.01 seconds will be described as an example.

The value of the throttle opening on the first throttle opening characteristic curve when the accelerator opening is x is TA ₁ (x), and the value of the throttle opening on the second throttle opening characteristic curve is TA ₂ (x). To do. In addition, the value of the transient throttle opening when the cycle is n−1 is TA (n−1), and the value of the transient throttle opening when the cycle is n is TA (n). Here, since n represents the serial number of the cycle representing the number of cycles, n−1 represents the cycle one cycle before the nth cycle, that is, the state 0.01 seconds before.

In FIG. 3A, for ease of understanding, the accelerator opening is constant at x = a, and TA ₁ (a) on the first throttle opening characteristic curve is changed to TA on the second throttle opening characteristic curve. ₂ Consider the case of moving to (a). At this time, the throttle opening TA (n) in the transitional state at the n-th cycle is
_{TA (n) = TA (n} -1) + (TA 2 (a) -TA (n-1)) / q ( formula 1a)
(Q is a transfer constant).

The transition from the first throttle opening characteristic to the second throttle opening characteristic is a change in which the throttle opening increases with the elapse of time for each fixed period. The change rate of the increase in the throttle opening at that time may be controlled under a predetermined rule by the throttle opening control device 10, but in this equation, the distance between TA ₂ (a) and TA (n−1) It is determined by L and the transfer constant q. That is, L / q is the rate of change of the throttle opening. In Equation 1a, the smaller the value of the transfer constant q, the quicker the transfer from the first throttle opening characteristic to the second throttle opening characteristic. That is, in FIG. 3A, the amount of movement from TA (n−1) to TA (n) increases.

  Here, in consideration of actual driving, in a driving state in which the first throttle opening characteristic is selected, in a situation where switching to the second throttle opening characteristic is necessary, a general road is changed to a highway. When entering, or when entering a main road where the flow of the vehicle is fast, or when it is necessary to change lanes, it is considered that rapid acceleration is often required to avoid danger. Therefore, it is desirable that the switching from the first throttle opening characteristic to the second throttle opening characteristic is performed as quickly as possible. Therefore, the transfer constant q is preferably set to a relatively small value within an appropriate range.

  Note that the switching from the first throttle opening characteristic to the second throttle opening characteristic may be performed by a changeover switch such as the eco switch 30 or the like according to the user's selection. It may be determined automatically from the accelerator opening.

  Next, a case of changing from the second throttle opening characteristic to the first throttle opening characteristic will be described with reference to FIG. FIG. 3B is a diagram for explaining transitional transfer control at the time of switching from the second throttle opening characteristic to the first throttle opening characteristic.

In FIG. 3B, as in FIG. 3A, the accelerator opening at the time of transfer is constant at x = a, and the first throttle opening is determined from TA ₂ (a) on the second throttle opening characteristic curve. Consider the case of moving to TA ₁ (a) on the degree characteristic curve. Similarly to FIG. 3 (a), if the transient throttle opening of the nth cycle is TA (n) and the transient throttle opening of the (n-1) th cycle is TA (n-1), TA (n) is
TA (n) = TA (n -1) - (TA (n-1) -TA 1 (a)) / r ( Equation 2a)
(R is a transfer constant).

  The change from the second throttle opening characteristic to the first throttle opening characteristic is a change in which the throttle opening decreases with the elapse of time for every fixed period. The time change rate of the decrease is shown in FIG. As in the case of, this expression depends on the distance L between TA (n-1) and TA (n) and the transfer constant r. In Equation 2a, the larger the value of r, the slower the transfer from the second throttle opening characteristic to the first throttle opening characteristic. That is, in FIG. 3B, the amount of movement from TA (n−1) to TA (n) becomes small.

  Here, in consideration of actual driving, a situation where the change from the second throttle opening characteristic to the first throttle opening characteristic is necessary is a situation where a sudden acceleration is required due to the second throttle opening characteristic. However, it is considered that the driving environment is stable and rapid acceleration is no longer necessary. Under such circumstances, the transition from the second throttle opening characteristic to the first throttle opening characteristic does not need to be rushed, but rather is slow so that the passenger feels uncomfortable with the change in switching of the throttle opening characteristic. It is preferable to carry out. Accordingly, the transfer constant r is preferably set to a relatively large value within an appropriate range.

  As described above, it is preferable that the switching change from the first throttle opening characteristic to the second throttle opening characteristic is performed quickly, and the switching change from the second throttle opening characteristic to the first throttle opening characteristic is slow. Preferably it is done. Comparing FIG. 3 (a) and FIG. 3 (b), at the time of the (n-1) th cycle, the remaining throttle opening change amount necessary for transferring to the other throttle opening characteristic is both. L, and the throttle opening change rates at that time are L / q and L / r, respectively. Here, since the relationship of q <r is satisfied, the rate of change of the throttle opening is larger in the case of FIG. 3A than in the case of FIG. As for the amount of change TA (n) -TA (n-1) of the throttle opening when moving to the nth cycle, FIG. 3 (a) is larger than FIG. 3 (b). In the case of 3 (a), it can be understood that the switching change is made quickly and in a shorter time than in the case of FIG. 3 (b).

  In other words, when the accelerator opening is constant, the amount of change in the throttle opening for each cycle is the second throttle opening when switching from the first throttle opening characteristic to the second throttle opening characteristic. Therefore, the time change rate (change speed) of the throttle opening is also increased.

  FIG. 4 shows an example of control in a transitional state at the time of switching between the first throttle opening characteristic and the second throttle opening characteristic in consideration of changes in the accelerator opening during actual driving of the vehicle. FIG.

FIG. 4A is a diagram illustrating control at the time of switching from the first throttle opening characteristic to the second throttle opening characteristic. When generalizing the above equation 1a,
_{TA (n) = TA (n} -1) + (TA 2 (x) -TA (n-1)) / q ( formula 1)
(Q is a transfer constant).

From Equation 1, TA (n) is based on the previous value TA (n-1), and the difference between the accelerator opening x at that time and the value TA ₂ (x) on the second throttle opening curve is q The range of change from the previous value is determined by dividing by. Therefore, every time the accelerator opening changes, the point TA ₂ (x) on the second throttle opening characteristic, which is the target value, changes, and a difference from the previous value TA (n−1) is taken. The corresponding value TA (n) divided by q is derived from Equation 1. Accordingly, as shown in FIG. 4 (a), the target value of the TA ₂ by a change in the accelerator opening x is while sliding, Yuki and definite the TA (n), finally converges on the TA _2.

FIG. 4B is a diagram illustrating control at the time of switching from the second throttle opening characteristic to the first throttle opening characteristic in consideration of the change in the accelerator opening. When generalizing the above equation 2a,
TA (n) = TA (n -1) - (TA (n-1) -TA 1 (x)) / r ( Equation 2)
(R is a transfer multiplier).

From Equation 2, TA (n) uses the previous value TA (n-1) as the base point of the throttle opening, and the target value TA ₁ (x) is determined depending on the change in the accelerator opening x. By dividing by, the rate of change is determined, and the process of finally determining TA (n) is repeated. Therefore, as in FIG. 4A, the target value on TA ₁ slides, TA (n) at the accelerator opening is determined, and finally converges on TA ₁ .

  In this way, considering the change in accelerator opening, the behavior of TA (n) during the transition between characteristics is somewhat complicated, but in reality, the difference between q and r should be sufficiently large. For example, even if the conditions are slightly different, it may be considered that the influence is not so great. In addition, if the amount of movement of the throttle opening between the characteristic curves at the time of transfer does not differ greatly between the cases of FIG. 4A and FIG. 4B, the behavior of TA (n) is the difference between q and r. Will eventually depend on. Therefore, even when the throttle opening changes, the transfer from the first throttle opening characteristic to the second throttle opening characteristic is performed more quickly than the transfer from the second throttle opening characteristic to the first throttle opening characteristic. It can be considered that the rate of change over time is large.

  FIG. 5 is a diagram illustrating an example of a change characteristic of the throttle opening with respect to the accelerator opening at the time of switching control when the throttle opening control device according to the present embodiment is actually applied to a vehicle. FIG. 5A is a diagram showing an example in which the throttle opening characteristic of the switching control changes linearly.

In FIG. 5 (a), when the accelerator opening is x = c and the switching control from the first throttle opening characteristic to the second throttle opening characteristic starts, the driver depresses the accelerator as it is. Since it is normal to continue acceleration, the accelerator opening increases even during switching control. In the switching control, the transition from the first throttle opening characteristic to the second throttle opening characteristic is executed quickly. However, since the accelerator is also stepped on, when the accelerator opening actually becomes x = d. It completely switches to the second throttle opening characteristic. At this time, the throttle opening changes from TA ₁ (c) to TA ₂ (d). Thereafter, the throttle opening characteristic changes in accordance with the substantially linear second throttle opening characteristic, so that it is possible to respond to a driver's request that requires rapid acceleration.

On the other hand, when sudden acceleration is no longer necessary, it is preferable to switch to an environment-friendly nonlinear first throttle opening characteristic. For example, if the control for switching from the second throttle opening characteristic to the first throttle opening characteristic is started when the accelerator opening is x = a, the accelerator opening usually decreases. For example, when the accelerator opening x = b, the first throttle opening characteristic is completely restored. At this time, the throttle opening changes from TA ₂ (a) to TA ₁ (b), and the time change rate (change speed) of the throttle opening at this time is changed from TA ₁ (c) to TA ₂ (d). It becomes smaller than the time change rate (change speed) of the throttle opening which changes to.

FIG. 5 (b) shows that the transition control draws a curve in the change in the throttle opening relative to the change in the accelerator opening in the transitional control at the time of switching between the first throttle opening characteristic and the second throttle opening characteristic. An example is shown. In FIG. 5B, the accelerator opening x = a, b, c, d and the corresponding throttle opening TA ₂ (a), TA ₁ (b), TA at the same position as in FIG. ₁ (c), TA ₂ (d) are shown. The only difference from FIG. 5A is that the manner in which the throttle opening changes with respect to the change in the accelerator opening is not linear, and from TA ₁ (c) on the first throttle opening characteristic. The speed at which TA ₂ (d) on the second throttle opening characteristic is shifted is greater than the speed at which TA ₂ (a) on the second throttle opening characteristic shifts to TA ₁ (b) on the first throttle opening characteristic. This is the same as in FIG.

  As shown in FIG. 5, even if the switching control between the first throttle opening characteristic and the second throttle opening characteristic is performed in various characteristic modes, the first throttle opening characteristic to the second throttle opening characteristic is changed. By making the time change rate (change speed) of the throttle opening at the time of switching larger than the time change rate (change speed) of the throttle opening at the time of switching from the second throttle opening characteristic to the first throttle opening characteristic When sudden acceleration is necessary to avoid danger, the throttle opening characteristic can be switched quickly, and when sudden acceleration is no longer necessary, the throttle opening characteristic can be switched slowly to ease the occupant's discomfort.

  FIG. 6 is a diagram for explaining a method for determining the presence or absence of the driver's sudden acceleration intention by the intention determination means 20. FIG. 6A is a diagram for explaining a method of calculating the accelerator opening degree TAmax for each driver.

  FIG. 6A is a diagram showing the time change of the accelerator opening for each stop-running-stop-stop of the driver between signals, for example. One mountain of the change curve shows one cycle every stop-run-stop. The maximum value TAmax is calculated for each cycle, the data is accumulated, and the average value AveTAmax is calculated. At this time, communication information such as GPS and G-BOOK is also used together with the communication information acquisition means 50 such as a navigation system. For example, data is classified for each road type such as a highway, a suburb, an urban area, and a side road. The average value AveTAmax may be calculated. Data may be accumulated in the history database 21 in FIG.

  FIG. 6B is a diagram showing a method for determining whether the driver intends to accelerate using the maximum accelerator opening average value AveTAmax calculated for each road type. For example, in FIG. 6B, when the maximum accelerator opening average value AveTAmax high speed on the highway is calculated, the value obtained by multiplying the value by the coefficient α may use AveTAmax high speed × α as a threshold value for determining whether there is an acceleration intention. . That is, when the accelerator opening exceeds AveTAmax high speed × α, it may be determined that the driver intends to accelerate. Here, α is a margin coefficient for determination and may be an appropriate value of 1 or more, and may be set to a value of about 1.2, for example. As a result, a value with a certain margin can be set as the threshold value for the average maximum accelerator opening that can be estimated as the maximum accelerator in the normal driving of the driver. This is because it is appropriate to judge that the opening degree exceeds the opening degree with a margin and the intention is sudden acceleration.

  Similarly, the fact that the driver's intention to accelerate is lost may be, for example, a value obtained by multiplying the maximum accelerator opening average value AveTAmax high speed by a coefficient β, AveTAmax high speed × β, as a threshold value for ending the acceleration intention. That is, it may be determined that the intention to accelerate is lost when the accelerator opening is smaller than AveTAmax high speed × β. Here, β is still a margin coefficient, and in this case, it may be an appropriate value smaller than 1, and may be about 0.8, for example. This is because there is no problem even if it is determined that the intention to accelerate is no longer present when the accelerator opening becomes a certain amount smaller than the maximum average accelerator opening.

  In FIG. 6B, the case of an expressway has been described as an example. However, in other types of roads, similarly, by setting a threshold based on the average maximum accelerator opening AveTAmax, the acceleration of the driver The presence or absence of intention may be determined. Further, the classification of the road type may be subdivided and the determination criteria may be set more finely to increase the accuracy of the determination, or rough classification may be performed for rough determination.

  FIG. 7 is a diagram showing a processing flow for determining the driver's intention to accelerate using the threshold set in FIG.

  In step 100, it is determined whether or not the accelerator opening degree TA exceeds an acceleration intention threshold AveTAmax × α. As described above, the margin coefficient α may be set to an appropriate value of 1 or more, for example, a value of about 1.1 to 1.5. When the accelerator opening exceeds the threshold value, the routine proceeds to step 110.

  In step 110, the rapid acceleration determination flag is turned ON, and a flag for starting control for switching from the first throttle opening characteristic to the second throttle opening characteristic is set. Here, the rapid acceleration determination flag will be described.

  FIG. 8 is a diagram showing ON / OFF states of the rapid acceleration determination flag. In FIG. 8, once the accelerator opening exceeds the acceleration intentional threshold value AveTAmax × α, the rapid acceleration determination flag is switched to ON, and even after that, even if the acceleration intentional threshold value AveTAmax × α is slightly below, the acceleration intention end threshold value AveTAmax As long as it does not fall below xβ, the rapid acceleration intention determination flag remains ON. By providing such hysteresis, hunting during switching control can be prevented.

  Returning to FIG. 7, in step 120, transfer control for switching from the first throttle opening characteristic to the second throttle opening characteristic is executed. For example, the transfer control may be executed by the method described in FIG. 3 or FIG. When the transfer control is executed and the first throttle opening characteristic is switched to the second throttle opening characteristic, the vehicle travel may be continued according to the second throttle opening characteristic.

  Returning to step 100, when the accelerator opening degree TA does not exceed the acceleration intention determination threshold value AveTAmax × α, the process proceeds to step 130.

  In step 130, it is determined whether the rapid acceleration determination flag is ON or OFF. As described with reference to FIG. 8, since the hysteresis for preventing hunting is provided in the rapid acceleration determination flag, switching control to the second throttle opening characteristic is temporarily performed by acceleration, and the vehicle is controlled by the second throttle opening characteristic. This is because it is necessary to determine whether the vehicle is traveling or whether the vehicle is traveling based on the first throttle opening characteristic without performing the switching control. When the rapid acceleration determination flag is OFF, it means that the vehicle is traveling based on the first throttle opening characteristic. Therefore, it is only necessary to continue traveling without performing the switching control, and the processing is ended as it is. On the other hand, when the rapid acceleration determination flag is ON, the process proceeds to step 140.

  In step 140, it is determined whether or not the accelerator opening degree TA is equal to or less than an acceleration intention end threshold value AveTAmax × β. When the accelerator opening degree TA is larger than the acceleration intention end threshold value, it is determined that the vehicle is still traveling according to the second throttle opening characteristic or the acceleration intention is continued during the switching control to the second throttle opening characteristic. Since it is in a state, the processing is terminated as it is. On the other hand, when the accelerator opening degree TA is equal to or smaller than the acceleration intention end threshold value, the routine proceeds to step 150.

  In step 150, the rapid acceleration determination flag is turned OFF. This is for executing switching control from the second throttle opening characteristic to the first throttle opening characteristic.

  In step 160, transfer control is performed from the linear second throttle opening characteristic with good acceleration to the non-linear first throttle opening characteristic with the throttle opening suppressed, and the process is returned to the earth-friendly driving mode. finish.

  As described with reference to FIGS. 6 to 8, it is determined whether or not the driver intends to accelerate, and based on the determination result, switching control between the first throttle opening characteristic and the second throttle opening characteristic is automatically performed. By doing so, the driver is freed from the troublesome switching operation and can concentrate on driving. Also, especially when sudden acceleration is necessary to avoid danger, it is expected that there is no room for operating the switch, so according to this embodiment, it is possible to execute automatic switching control of the throttle opening characteristic quickly, Crew safety can be improved.

  In the present embodiment, the determination of whether or not there is an intention to accelerate has been described based on the absolute opening value of the accelerator. Alternatively, the time change rate ΔTA / hour of the accelerator opening may be used. . In this case, for example, the time change rate of the accelerator opening when the maximum accelerator opening is recorded during traveling may be recorded. Then, from the accumulated data, an average accelerator opening time change rate at the time of recording the maximum accelerator opening may be calculated, and a threshold value may be set by multiplying the value by a margin coefficient α, β or the like. Only the threshold setting method and the target parameter for determination are different, and the determination method can be performed in the same manner as described above.

  FIG. 9 is a diagram for explaining a determination method different from the driver's acceleration intention determination method described in FIGS. 6 to 8. FIG. 9A is a diagram illustrating accumulation of data for learning how to step on the driver's accelerator.

  In FIG. 9 (a), the maximum accelerator opening degree TAmax for each stop is recorded from the first stop to the run, and the maximum accelerator opening degree for the nth run is recorded as TAmax (n), n. The maximum accelerator opening learning value up to the first time is represented by A (n). FIG. 9 (a) shows a state where there is an (n + 1) th run in this state and TAmax (n + 1) is recorded.

  FIG. 9B learns, from the data shown in FIG. 9A, the wrinkles that appear in the accelerator opening based on how the driver steps on the accelerator, and determines whether the driver intends to accelerate based on this Shows how to do. This will be described below.

In step 200, the driver learns how to step on the accelerator during normal times. The learned value of the maximum accelerator opening is
A (n + 1) = (x−1) / x * A (n) + 1 / x * TAmax (n + 1) (Formula 3)
Can be expressed as Here, the filter constant x is set to a sufficiently large value to learn the driver's habit.

  Hereinafter, a specific numerical value is substituted for explanation. Equation 3 is based on the idea that the driver's habit is accumulated over a long period of time with data on the maximum accelerator opening, and for example, the filter constant x = 100 is considered. Here, it is assumed that when the learned value A (n) of the maximum accelerator opening up to the nth time is 100, the maximum accelerator opening TAmax (n + 1) of the (n + 1) th time is input at 200, which is twice the learned value. At this time, according to Equation 3, A (n + 1) = 101, which is almost a value close to A (n) = 100, and even if a large value suddenly enters, the learning value A (n + 1) changes greatly. Not give. Similarly, when TAmax (n + 1) = 200 is entered when the learning value A (n) = 100 and x = 200, A (n + 1) = 100.5, which is not significantly affected. Therefore, by setting x to a sufficiently large value in Equation 3, a learning value A (n) with higher reliability can be obtained.

  As described in FIG. 6, for the learning value A (n), communication information from the external center 60 such as GPS or G-BOOK is used by using the communication information acquisition unit 50, for example, an expressway Alternatively, learning may be performed separately for each type of road, such as in the suburbs, in the city, or on side streets. Moreover, you may make it learn by dividing into date and time like a commuting, a weekday, a holiday, etc. Thus, by subdividing and learning and obtaining the learning value A (n), the accuracy of the learning value A (n) of the maximum accelerator opening can be improved.

  Next, in step 210, the driver's intention is learned by the following equation 4.

B (n + 1) = (y−1) / y * B (n) + 1 / y * TAmax (n + 1) (Formula 4)
The driver's intention means a short-term driver's intention such as, for example, when he is commuting in the morning and is in a hurry because the meeting is ahead. Therefore, the above-described learning of wrinkles is performed over a long period of time, but the intention learning is performed in a short period of about 3 to 4 times. Here, the filter constant is set to a sufficiently small value that can eliminate a single operation and noise in order to determine the intention of the driver at that time. For example, y = 2 or 3 may be set. If y = 2 and B (n) = 100 and TAmax (n + 1) = 200 is entered, B (n + 1) = 150, which reflects the driver's intention.

  In step 220, the driver's intention to accelerate is determined. Similarly to the description in FIG. 6, the acceleration intention presence threshold value and the acceleration intention end threshold value may be set by multiplying the learning value A (n + 1) of the maximum accelerator opening by the margin coefficients α and β. Since the intention threshold for acceleration is set based on the learned value A (n + 1) of the maximum accelerator opening, it needs to be larger than that, and the margin coefficient α multiplied by the learned value A (n + 1) is an appropriate value of 1 or more. May be set. For example, the value may be set to about 1.1 to 1.5, and preferably about 1.2. On the contrary, the margin coefficient β multiplied by the acceleration intention end threshold value needs to be 1 or less, and may be set to an appropriate value of about 0.5 to 0.9, for example, preferably about 0.8. It may be set.

  These threshold values are compared with the learning value B (n + 1) of the driver's intention, and if the driver's intention learning value B (n + 1) exceeds the acceleration intention threshold A (n + 1) × α, the acceleration intention is present. You may judge. Conversely, when the learned value B (n + 1) of the driver's intention is equal to or less than the acceleration intention end threshold A (n + 1) × β, it may be determined that the acceleration intention ends. At this time, as described with reference to FIG. 8, hysteresis may be provided to prevent hunting.

  Step 230 shows an example of a specific measure in the vehicle when it is determined that there is an intention to accelerate. When it is determined that there is an intention to accelerate, the control by the eco-switch 30 is stopped by performing switching control from the first throttle opening characteristic to the second throttle opening characteristic, and the eco-indicator indicating that the eco-driving state is present The lamp may be turned off, and the advice to the driver on the acceleration suppression by the eco advice device may be stopped.

  The eco-indicator is, for example, one in which the lamp is turned on when the driver does not depress the accelerator very much during driving, and is turned off when the accelerator is depressed. The eco advice device is a device that detects and calculates the driver's accelerator operation and brake operation, for example, and sends advice to the driver to that effect during rough driving. If the driver is operated until an emergency, the driver may be bothered and annoyed. Therefore, when the driver has an intention to accelerate, these functions may be canceled and stopped.

  According to this embodiment, it is possible to more accurately determine the intention of acceleration by learning how to step on the driver's accelerator.

  Instead of the accelerator opening degree TAmax (n), learning may be performed using the change rate ΔTAmax / time of the accelerator opening degree, and the intention of acceleration may be determined using this as a target parameter.

  FIG. 10 is a diagram for explaining a method of further improving the learning accuracy when learning how to step on the driver's accelerator.

  In FIG. 9, the driver's normal accelerator stroke is learned by Equation 3, but for example, when there is an event such as fireworks or concerts or when there is road construction, traffic congestion occurs. The driving environment may differ greatly from normal. In such a case, if learning is performed using the normal filter constant x, many cases are learned that do not reflect the driver's normal accelerator stroke, which may lead to erroneous learning results. There is.

  Therefore, in order to prevent such an adverse effect, as shown in FIG. 10, vehicle position information, VICS information such as traffic accidents and traffic jams, event information, and the like are sent to the G-BOOK external center 60 by GPS or the like. To. If the external center 60 determines that it is significantly different from the normal traveling state based on such information, a signal may be sent to the vehicle to stop learning the kite or increase the filter constant x. In other words, learning may not be performed in a driving state different from normal or the influence thereof may be lowered so as not to affect the accumulated data.

  According to the present embodiment, the learning value A (n) with higher accuracy is obtained, and the accuracy of the driver's acceleration intention determination is increased.

  In addition, although the determination method of the acceleration intention has been described so far, in this embodiment, in addition to the acceleration intention determination, the intention determination can be performed for other operation systems by using other data. For example, the intention of sudden braking can be determined by using the data of the pressure change of the brake pressure. This may be reflected, for example, in an eco advice device or the like, and when it is determined that the driver has an intention of sudden braking, the eco advice may be canceled. Similarly, the intention of the sharp steering wheel may be determined using the change in the steering angle as a parameter. In this case as well, if it is determined that the driver intends to handle the steering wheel quickly, it is possible to take measures such as canceling the eco advice.

  Moreover, since an emergency avoidance operation can be determined by intention determination, it can be reflected not only in the environment but also in safety control. For example, if it is determined that the driver intends to brake suddenly, the hazard lamps can be blinked to notify the surroundings, which can be used for safety control.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

It is a system configuration diagram showing an example of a throttle opening control device according to the present embodiment. It is the figure which showed the 1st throttle opening characteristic of the throttle opening control apparatus 10 which concerns on a present Example, and the 2nd throttle opening characteristic. It is a figure for demonstrating the control at the time of the switching of the curve of a 1st throttle opening characteristic, and the curve of a 2nd throttle opening characteristic. FIG. 3A is a diagram for explaining the control at the time of switching from the first throttle opening characteristic to the second throttle opening characteristic. FIG. 3B is a diagram for explaining the control at the time of switching from the second throttle opening characteristic to the first throttle opening characteristic. It is the figure which showed the example of the control at the time of switching with the 1st throttle opening characteristic which considered the change of the accelerator opening, and the 2nd throttle opening characteristic. FIG. 4A is a diagram illustrating control at the time of switching from the first throttle opening characteristic to the second throttle opening characteristic. FIG. 4B is a diagram showing control at the time of switching from the second throttle opening characteristic to the first throttle opening characteristic. It is the figure which showed the control at the time of switching with the 1st throttle opening characteristic which considered the change of the accelerator opening, and the 2nd throttle opening characteristic. FIG. 5A shows a case where the change of the throttle opening with respect to the change of the accelerator opening of the transfer control is almost linear. FIG. 5B shows an example in which the change in the throttle opening with respect to the change in the accelerator opening in the transfer control is a curve. It is explanatory drawing of the method of determining the presence or absence of a driver | operator's sudden acceleration intention by the intention determination means. FIG. 6A is an explanatory diagram of a method for calculating the accelerator opening degree TAmax for each driver. FIG. 6B is a diagram showing a method of determining the driver's intention to accelerate using the maximum accelerator opening average value. It is the figure which showed the processing flow which determines a driver | operator's acceleration intention using the threshold value set in FIG. It is the figure which showed the ON / OFF state of the rapid acceleration judgment flag It is a figure for demonstrating the acceleration intention determination method different from FIGS. FIG. 9A is a diagram illustrating the learning of a driver's heel. FIG. 9B is a diagram illustrating a method for determining whether or not the driver intends to accelerate based on learning a driver's habit. It is explanatory drawing about the method of raising learning precision at the time of learning a driver | operator's habit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Throttle opening control apparatus 11 Electronically controlled throttle motor 12 Throttle valve 13 Throttle position sensor 20 Intent judging means 21 History database 22 Accelerator pedal 23 Accelerator position sensor 30 Eco switch 31 Switching means 40 Engine control computer 50 Communication information acquisition means 51 Antenna 60 External center

Claims (4)

The first throttle opening characteristic for opening the throttle at a predetermined opening with respect to the predetermined accelerator opening, and the throttle with an opening larger than the opening indicated by the first throttle opening characteristic for the same accelerator opening A throttle opening control device for an engine that performs switching control with a second throttle opening characteristic that opens
The time change rate of the throttle opening at the time of switching from the first throttle opening characteristic to the second throttle opening characteristic is the throttle at the time of switching from the second throttle opening characteristic to the first throttle opening characteristic. A throttle opening control device characterized by being larger than a time change rate of the opening.   The throttle opening control device includes intention determination means for determining the driver's intention. When the intention determination means determines that the driver has an intention to accelerate in the state of the first throttle opening characteristic, the throttle opening control device 2. The throttle opening control device according to claim 1, wherein switching from one throttle opening characteristic to the second throttle opening characteristic is performed.   When the intention determining means determines that the driver no longer intends to accelerate in the state of the second throttle opening characteristic, the throttle opening control device determines the first throttle opening from the second throttle opening characteristic. The throttle opening degree control device according to claim 2, wherein switching to the characteristic is performed.   4. The throttle opening according to claim 2, wherein the intention determination unit determines whether or not the driver intends to accelerate based on history data of a maximum accelerator opening of the driver's past driving. 5. Control device.

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