JP2006151323A - Acceleration/deceleration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively arbitrate deceleration generated in the non-operating position of an accelerator pedal and deceleration generated by operating a brake pedal, at the operation release of the brake pedal while generating the deceleration in the non-operating position of the accelerator pedal. <P>SOLUTION: This acceleration/deceleration control device has the accelerator pedal having a decelerating region and an accelerating region within an operating stroke and having the non-operating position within the decelerating region; the brake pedal having the decelerating region within the operating stroke and capable of meeting a demand of larger deceleration than maximum deceleration that can be demanded by the operation of the accelerator pedal; an arbitration means for determining final target deceleration to the operation of the brake pedal, based on predetermined first target deceleration which is not zero, corresponding to the non-operating position of the accelerator pedal, and second target deceleration corresponding to each operating position of the brake pedal; and a braking force generator operated according to the final target deceleration. The arbitration means arbitrates so that the final target deceleration may become zero when the brake pedal operation is completely released. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an acceleration / deceleration control device that controls deceleration of a vehicle, and more particularly to an acceleration / deceleration control device that controls acceleration / deceleration in accordance with an operation of an accelerator pedal.

Conventionally, a system that controls acceleration / deceleration in accordance with an operation of an accelerator pedal is known (see, for example, Patent Document 1).
JP 2000-205015 A

  By the way, in such a system, both the acceleration region and the deceleration region are formed in the stroke of the accelerator pedal. However, since the deceleration region is set to the shallow operation region of the accelerator pedal, the accelerator pedal is in the non-operation position (that is, the depression amount). Even if zero), a deceleration request is issued. For this reason, in such a system, braking force is generated just by releasing the accelerator pedal during sudden braking such as in an emergency, so that the braking system does not generate until the pedal is switched from the accelerator pedal to the brake pedal. In comparison, it is possible to increase the safety of the vehicle by reducing the idle travel distance.

  However, in such a system, on the other hand, it is necessary to form both the acceleration region and the deceleration region within the limited stroke of the accelerator pedal, so that a dynamic range including a large deceleration is realized within this limited stroke. When trying to do so, the amount of change in the acceleration / deceleration per certain manipulated variable inevitably tends to increase. In this case, the acceleration / deceleration change with respect to the operation of the accelerator pedal tends to be hypersensitive, and there is a problem that the operability of the accelerator pedal is deteriorated.

  On the other hand, not all decelerations can be generated only by operating the accelerator pedal, but it is possible to generate a deceleration greater than the deceleration that can be generated by operating the accelerator pedal by operating the brake pedal. Configuration is conceivable. In this case, the brake pedal provides the necessary deceleration dynamic range, and the deceleration range of the accelerator pedal can be reduced (maximum target deceleration can be reduced). Response can be prevented. In addition, while the deceleration is generated with the accelerator pedal released, a larger deceleration can be generated by operating the brake pedal. Necessary large braking force can be secured.

  However, in such a configuration, since deceleration is always required when the accelerator pedal is released (non-operating position), it is necessary to adjust and mediate the requested deceleration and the requested deceleration by operating the brake pedal. .

  The present invention has been made with a new focus on the necessity of such arbitration, and an object of the present invention is to provide an acceleration / deceleration control device capable of realizing effective arbitration particularly when the brake pedal is released.

In order to solve the above problems, according to one aspect of the present invention, an accelerator pedal having a deceleration region and an acceleration region in an operation stroke, and a non-operation position belonging to the deceleration region;
A brake pedal having a deceleration area in the operation stroke and capable of requesting a deceleration greater than the maximum deceleration that can be requested by operating the accelerator pedal;
Based on the predetermined first non-zero target deceleration corresponding to the non-operating position of the accelerator pedal and the second target deceleration corresponding to each operating position of the brake pedal for the operation of the brake pedal, Arbitration means for determining deceleration;
A braking force generator that operates according to the final target deceleration,
The arbitration means performs the arbitration so that the final target deceleration becomes zero when the brake pedal operation is completely released, and an acceleration / deceleration control device is provided.

According to another aspect of the present invention, an accelerator pedal having a deceleration region and an acceleration region in an operation stroke, the non-operation position belonging to the deceleration region;
A brake pedal having a deceleration area in the operation stroke and capable of requesting a deceleration greater than the maximum deceleration that can be requested by operating the accelerator pedal;
Based on the predetermined first non-zero target deceleration corresponding to the non-operating position of the accelerator pedal and the second target deceleration corresponding to each operating position of the brake pedal for the operation of the brake pedal, Arbitration means for determining deceleration;
A braking force generator that operates according to the final target deceleration,
The arbitration means determines a final target deceleration based on the first target deceleration for an operation of a brake pedal for which the second target deceleration does not exceed a predetermined value, and performs an operation for releasing the brake pedal. An acceleration / deceleration control device is provided that changes the first target deceleration when the engine speed is detected.

  In each of the above aspects, the arbitration unit may perform the change so that the first target deceleration approaches zero as the operation of the brake pedal is released. The arbitration means, in one operation step of the brake pedal, after the second target deceleration exceeds a predetermined value as the amount of operation of the brake pedal increases, the final target is based only on the second target deceleration. The deceleration may be determined. The arbitration means derives a second target deceleration obtained by correcting the second target deceleration upward, and after the second corrected target deceleration increased above a predetermined value in one operation process of the brake pedal, The final target deceleration may be determined based only on the upwardly corrected second target deceleration. In this case, it is preferable that the upward correction degree with respect to the second target deceleration by the arbitrating means is a process in which the brake pedal operation amount is decreased in the process of increasing the brake pedal operation amount in one operation process of the brake pedal. Larger than in

  According to the present invention, an acceleration / deceleration control device capable of effectively adjusting the deceleration and the deceleration caused by the operation of the brake pedal while generating the deceleration at the non-operation position of the accelerator pedal when releasing the operation of the brake pedal. Can be obtained.

  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 showing an embodiment of an acceleration / deceleration control apparatus according to the present invention.

  The acceleration / deceleration control device 10 of this embodiment is configured with a target acceleration / deceleration calculation device 20 as the center.

  Various electronic components in the vehicle (various sensors such as a vehicle speed sensor and various ECUs such as a navigation ECU) are connected to the target acceleration / deceleration calculation device 20 via an appropriate bus such as a CAN (controller area network). Is done. These various electronic components include an accelerator opening sensor 12 for detecting the operation amount of the accelerator pedal, a brake operation detecting means 14 for detecting the operation of the brake pedal, a driving force generator (for example, an engine), and a braking force generator. Each includes a drive torque manager 40 and a brake manager 50 that collectively control the device (eg, brake). In the case of an electric vehicle or a hybrid vehicle, the driving force generator includes an electric motor for driving wheels.

  The accelerator opening sensor 12 is disposed in the vicinity of the accelerator pedal. The accelerator opening sensor 12 outputs an electrical signal corresponding to the accelerator pedal depression stroke amount (hereinafter referred to as “accelerator opening”) to the target acceleration / deceleration calculation device 20.

  The brake operation detection means 14 may be a sensor that outputs an electrical signal corresponding to the operation amount (operation position, master cylinder pressure) of the brake pedal. The brake pedal of this embodiment is substantially the same as a normal brake pedal having only a deceleration region, but generates a deceleration larger than the maximum deceleration possible in the deceleration region of the accelerator pedal, as will be described later. To be operated.

  The target acceleration / deceleration calculation device 20 of the present embodiment determines a target acceleration / deceleration to be generated in the vehicle based on the accelerator opening from the accelerator opening sensor 12, as will be described in detail below.

  FIG. 2 is a functional block diagram illustrating an example of the target acceleration / deceleration calculation device 20. The target acceleration / deceleration calculation device 20 is configured as a microcomputer including a CPU, a ROM, a RAM, and the like connected to each other via a bus (not shown). The ROM stores a program executed by the target acceleration / deceleration calculation device 20 and various data necessary for the program (for example, various maps described later).

An accelerator opening signal is supplied from the accelerator opening sensor 12 to the target acceleration / deceleration calculation device 20. As shown in FIG. 2, the target acceleration / deceleration calculation device 20 is a map (hereinafter referred to as “AC-G map”) in which the AC-G map processing unit 22 defines the relationship between the accelerator opening and the target acceleration / deceleration. According to FIG. 5, the target acceleration / deceleration [m / s ² ] corresponding to the accelerator opening [%] is determined.

The target acceleration / deceleration [m / s ² ] is converted into output shaft torque [N · m] in the subsequent output shaft torque converter 23. This output shaft torque is added to the travel resistance torque calculated by the travel resistance torque calculation unit 24 and input to the braking / driving distribution unit 26 as the final target output shaft torque.

  In the running resistance torque calculation unit 24, the running resistance torque may be appropriately calculated based on the vehicle speed. At this time, the running resistance torque may be corrected by various factors such as road surface μ (friction force between the tire and the road) and / or road gradient (road surface gradient of the road). In this case, weather information such as rain and snow that may affect the road surface μ may be taken into consideration. Further, the road gradient may be detected by any appropriate method, for example, it may be detected using road gradient information that can be included in the map data of the navigation device, or from an external information providing center. It may be detected using the provided road gradient information.

  The braking / driving distribution unit 26 distributes the target output shaft torque to the drive output shaft torque and the braking output shaft torque, and determines the target drive output shaft torque and the target braking output shaft torque that realize the target output shaft torque. The target drive output shaft torque thus obtained is input to the drive torque manager 40.

  The target braking output shaft torque is converted into wheel shaft torque by the wheel shaft torque converting unit 28 and input to the brake manager 50 through the braking torque adjusting unit 36. The braking torque arbitration unit 36 arbitrates between the above-described wheel shaft torque (the wheel shaft torque in the deceleration region of the accelerator pedal) and the required braking torque by operating the brake pedal to determine the final target braking torque. . The target braking torque obtained in this way is input to the brake manager 50. The required braking torque is obtained by converting the required braking deceleration obtained from the BS-G map processing unit 32 into the braking torque by the braking torque converting unit 34. The required braking deceleration is determined by the BS-G map processing unit 32 according to a BS-G map (see FIG. 5B) that defines the relationship between the brake pedal operation amount and the required braking deceleration. The details of the mode of arbitration in the braking torque arbitration unit 36 and the BS-G map used in the BS-G map processing unit 32 will be described later.

  FIG. 3 is a functional block diagram illustrating an example of the drive torque manager 40. The drive torque manager 40 is configured as a microcomputer including a CPU, a ROM, a RAM, and the like connected to each other via a bus (not shown).

  In the drive torque manager 40, as shown in FIG. 3, a gear ratio according to the target drive torque is determined by the gear ratio determination unit 42, and the gear ratio of the transmission is changed by the gear shift execution unit 44 as necessary. At the same time, the target engine torque calculation unit 46 determines the target engine torque, and various engine controls such as electronic throttle control, ignition advance / retard angle control, and fuel cut control are executed based on the target engine torque.

  FIG. 4 is a functional block diagram illustrating an example of the brake manager 50. The brake manager 50 is configured as a microcomputer including a CPU, a ROM, a RAM, and the like connected to each other via a bus (not shown).

  In the brake manager 50, as shown in FIG. 4, a target braking pressure according to the target braking torque is calculated in the target wheel braking pressure calculation unit 52, and brake braking pressure control is executed via the braking pressure control block 54. .

  FIG. 5A shows an example of an AC-G map used in the AC-G map processing unit 22 described above. In the AC-G map shown in FIG. 5A, a deceleration region (target acceleration / deceleration <0) is provided in the range of 0 ≦ accelerator opening <AC1 (shallow operation region of the accelerator pedal), and AC2 ≦ accelerator opening. (Acceleration region where the accelerator pedal is deep) is provided with an acceleration region (target acceleration / deceleration> 0). A dead zone region in which the target acceleration / deceleration is 0 is provided in the range of AC1 ≦ accelerator opening <AC2. That is, as shown in FIG. 5A, a dead zone region is provided as a boundary region between the deceleration region and the acceleration region.

The non-operation position of the accelerator pedal (accelerator opening = 0) belongs to the deceleration region, and the largest target deceleration is set in the example shown in FIG. Hereinafter, the target deceleration corresponding to the non-operating position of the accelerator pedal is referred to as “target deceleration G _AC0 ”.

  In the deceleration region and the acceleration region, as shown in FIG. 5A, the change gradient of the target acceleration / deceleration with respect to the accelerator opening is a predetermined value sufficiently larger than zero (however, it is not necessary to be a constant gradient, and may be a variable value). ). On the other hand, in the dead zone region, the change gradient of the target acceleration / deceleration is set to substantially zero.

  Note that setting the dead zone region is optional. When the dead zone is set, the target acceleration / deceleration changes slowly or not at all with the change in the accelerator opening in the dead zone, so the amount of change in the target acceleration / deceleration with respect to the change in the accelerator opening becomes small. It is prevented that acceleration / deceleration is realized in response to a slight operation.

  Thus, in this embodiment, not only acceleration of the vehicle but also deceleration is realized by operating the accelerator pedal, and braking force is generated even when the accelerator pedal is not operated. Therefore, in this embodiment, braking force is generated just by releasing the accelerator pedal during sudden braking such as in an emergency, so that it is compared with a general configuration that requires switching from the accelerator pedal to the brake pedal during braking operation. Thus, the free running distance can be reduced and the braking ability of the vehicle can be increased.

  FIG. 5B shows an example of a BS-G map used in the BS-G map processing unit 32. The BS-G map has substantially no acceleration region, and a deceleration region (target acceleration / deceleration ≦ 0) is set over the entire range of the brake operation amount (that is, the entire stroke of the brake pedal). When the brake operation amount is zero, the target acceleration / deceleration is substantially zero, and the target deceleration increases as the brake operation amount increases.

Here, in contrast to the AC-G map shown in FIG. 5A, the BS-G map has a maximum target deceleration Gmax larger than the maximum target deceleration (= target deceleration G _AC0 ) in the AC-G map. have. This means that a deceleration larger than the deceleration that can be generated by the accelerator pedal can be generated by the brake pedal. The maximum target deceleration Gmax in this BS-G map is determined from the maximum braking force (maximum deceleration) required in an emergency or the like, as in a normal vehicle.

  In this way, in this embodiment, the dynamic range of the required deceleration can be covered with the brake pedal, so that the deceleration range that the accelerator pedal can handle can be reduced (because the maximum target deceleration can be reduced), so that a slight operation of the accelerator pedal is possible. Therefore, it is possible to prevent an excessive acceleration / deceleration response, and the operability of the accelerator pedal is improved.

  In FIG. 5 (A), the characteristic pattern in the case where the accelerator pedal takes charge of the entire dynamic range is shown as a control by a dotted line. As is clear from the characteristic pattern indicated by the solid line according to the present embodiment, by reducing the deceleration range that the accelerator pedal is responsible for, the gradient of the characteristic pattern as a whole becomes gentler. It can be seen that the amount of change in the target acceleration / deceleration with respect to the change is reduced, and the sensitive response to a slight operation amount of the accelerator pedal is suppressed.

When the brake pedal is operated, the target deceleration corresponding to the brake operation amount is determined in the BS-G map processing unit 32 according to the BS-G map as described above. In the state where the brake pedal is operated, the accelerator pedal is not operated. However, even in this case, in the present embodiment, the AC-G map processing unit 22 corresponds to zero accelerator opening as described above. A non-zero target deceleration G _AC0 is determined. These two target decelerations are finally input to the drive torque manager 40 as the target drive output shaft torque through the adjustment by the braking torque adjustment unit 36.

  As described above, the present embodiment includes the braking torque adjusting unit 36 that adjusts the deceleration request generated when the accelerator pedal is not operated and the deceleration request generated by the operation of the brake pedal, and thus is generated at the non-operating position of the accelerator pedal. The braking force required by operating the brake pedal can be generated while maintaining the braking force. Thus, in this embodiment, during a sudden braking such as an emergency, the driver does not operate the accelerator pedal until the driver releases the accelerator pedal and depresses the brake pedal in the process of depressing the brake pedal. Since the braking force corresponding to the position is generated and the brake pedal is depressed, the braking force by the brake pedal can be generated, so there is no blank period until high braking force is generated, and the braking capability is remarkably improved To do.

  Hereinafter, various arbitration modes realized in the braking torque arbitration unit 36 according to the above-described embodiment will be described for each embodiment.

FIG. 6 is an explanatory diagram illustrating an arbitration mode realized in the braking torque arbitration unit 36 according to the first embodiment. FIG. 6 shows, in chronological order, how the target deceleration changes in the process in which the driver releases the accelerator pedal and depresses the brake pedal, and in the process in which the brake pedal is released. The change history of the target deceleration determined in accordance with the AC-G map (hereinafter referred to as “target deceleration G _AC ”) is shown together with the operation history of the accelerator pedal, and FIG. A change history of a target deceleration determined in accordance with the BS-G map (hereinafter referred to as “target deceleration G _BS ”) is shown together with a brake pedal operation history.

The FIG. 6 (C), the final target deceleration rate to be finally determined based on the target deceleration G _AC and the target deceleration G _BS (hereinafter, referred to as "final target deceleration G _F") change history is shown Has been. In the example shown in FIG. 2, the braking torque arbitration section 36, but is arbitrating these target deceleration G _AC and target deceleration G _BS after torque conversion, the final target decrease shown in FIG. 6 (C) an output history of velocity G _F, and the output history of the target drive output shaft torque of the brake torque arbitration section 36 (and hence the final braking force), is in one-to-one relationship with the conversion formula, there is no substantial difference. Therefore, in the following description, it is to be understood that the change mode of the final target deceleration G _F indicates the mode of arbitration of the braking torque mediation unit 36.

In FIG. 6, time t0 is the time when the accelerator pedal operation amount enters the deceleration region in the process of releasing the accelerator pedal, and time t1 is the time when the accelerator pedal is completely released. To express. As shown in FIG. 6A, until time t1, the target deceleration G _AC increases with a decrease in the accelerator pedal operation amount (accelerator opening), and after the accelerator pedal depression release time t1, The target deceleration G _AC , which is a deceleration request from, becomes a constant value of the target deceleration G _AC0 related to the non-operating position of the accelerator pedal.

Further, in FIG. 6, the time t2, the time when the depression of the brake pedal is started, time t3, a time when the target deceleration G _BS exceeds the target deceleration G _AC, the time t4, a brake pedal Represents the point in time when the depressing to a certain position is completed. As shown in FIG. 6 (B), from the time t2, the target deceleration G _BS is a deceleration request from the brake pedal begins to occur, progressively increase the target deceleration G _BS with the subsequent further brake operation and, stepping operation at time t4, the target deceleration G _BS ends is maintained at a constant value. From release starting time t5 of the braking operation, gradually decreases the target deceleration G _BS with a decrease in the operation amount of the brake pedal, the target deceleration G _BS becomes zero at release completion time t7.

In the depression process of the brake pedal (i.e. t1 to t4), the braking torque arbitration section 36, the two target deceleration G _AC0 and the target deceleration G _BS, the larger the target deceleration as the final target deceleration G _F decide. Thus, in this example, as shown by the solid line in FIG. 6 (C), until the time t3 when the target deceleration G _BS exceeds the target deceleration G _AC0 is the target deceleration G _AC0, target by the operation of the brake pedal in preference to the deceleration G _BS, it is determined as the final target deceleration G _F. On the other hand, after the time t3 when the target deceleration G _BS exceeds the target deceleration G _AC0, the target deceleration G _BS is, in preference to the target deceleration G _AC0 according to the non-operation position of the accelerator pedal, the final target deceleration G Determined as _F.

In depression releasing process of the brake pedal (i.e. t5 to t7), the braking torque mediation unit 36, determines a target deceleration G _BS as the final target deceleration G _F. That is, the target deceleration G _BS even after the time t6 when below the target deceleration G _AC, the target deceleration G _AC0 without target deceleration G _BS is adopted as the final target deceleration G _F. For this reason, at the release completion time t7, that is, at the time t7 when the brake pedal operation is completely released, the target deceleration _GBS (= zero) corresponding to the brake pedal operation amount zero is realized. In other words, while the brake pedal operation amount is less than the predetermined value, the final target deceleration G _F is governed by the target deceleration G _AC0, and the brake pedal operation amount becomes predetermined as the brake pedal operation amount increases. Once above the value, thereafter, the final target deceleration G _F is (depending on the rule of the target deceleration G _BS) of BS-G is determined according to the map.

  As described above, according to the present embodiment, since the acceleration / deceleration is controlled to be zero when the operation of the brake pedal is completely released, the deceleration mode of the vehicle with respect to the release operation of the brake pedal is determined by the driver. It is in line with the intention, and an operation feeling without a sense of incongruity can be realized.

FIG. 7 is an explanatory diagram illustrating an arbitration mode realized in the braking torque arbitration unit 36 according to the second embodiment. Similarly, FIG. 7 shows, in time series, how the target deceleration changes in the process in which the driver releases the accelerator pedal and depresses the brake pedal, and in the process of releasing the depression of the brake pedal. (A) shows the change history of the target deceleration G _AC determined according to the AC-G map, together with the accelerator pedal operation history, and FIG. 7 (B) shows the change history determined according to the BS-G map. that the change history of the target deceleration G _BS is shown together with the operation history of the brake pedal. The explanation of the times t1 to t7 related to the operation history of the accelerator pedal and the brake pedal is the same as described above.

In this embodiment, as shown in FIG. 7 (B), small amount of operation of the brake pedal, to when the target deceleration G _BS does not exceed the target deceleration G _AC0 in braking operation the course of the one. In this case, the depression course of the brake pedal (i.e. t1 to t4), the braking torque mediation unit 36, towards the target deceleration of the larger of the two target deceleration G _AC0 and the target deceleration G _BS, i.e. the target deceleration G the determined as the final target deceleration G _{F AC0.} Thus, in this example, as shown by the solid line in FIG. 6 (C), even when the brake pedal operation, the target deceleration G _AC0 according to the non-operation position of the accelerator pedal is determined as the final target deceleration G _F The

On the other hand, in the brake pedal depression release process (i.e., t5 to t7), the braking torque adjuster 36 still determines the target deceleration G _AC0 as the final target deceleration G _F , but at this time, the brake pedal release completion time t7, that is, the first target deceleration at time t7 when the brake pedal operation is released completely so that zero, to determine the final target deceleration G _F by correcting the target deceleration G _AC0. That is, as shown by the solid line in FIG. 7C, the target deceleration G _AC0 (= final target deceleration G _F ) related to the non-operating position of the accelerator pedal is zero as the operation amount of the brake pedal decreases. It is corrected to become.

In other words, when the brake pedal operation release start operation is detected, the braking torque arbitration unit 36 follows the decreasing gradient k (= _GAC0 / BS1) determined by the brake pedal operation amount BS1 at that time. A final target deceleration G _F (= G _AC0 ′ = G _AC0 −k (BS1−BS)) corresponding to the operation amount BS is determined. Note that the release operation of the brake pedal can be detected based on the detection value from the brake operation detection means 14. For example, the release operation of the brake pedal is detected when the negative change speed of the brake pedal operation amount exceeds a predetermined value. May be.

  As described above, according to this embodiment, even when the amount of operation of the brake pedal is small, control is performed so that acceleration / deceleration is zero when the operation of the brake pedal is completely released. The deceleration mode of the vehicle with respect to the pedal release operation is in line with the driver's intention, and an operation feeling without a sense of incongruity can be realized.

Figure 8 is an explanatory diagram showing an arbitration mode is realized in the braking torque mediation unit 36 according to the third embodiment, similar to FIG. 7 (C), the relative variant of the target deceleration G _AC and the target deceleration G _BS A change mode of the final target deceleration G _F is shown. The third embodiment has a small operation amount of the brake pedal, to when the target deceleration G _BS does not exceed the target deceleration G _AC0 in braking operation the course of the one.

This embodiment, the braking torque arbitration section 36, BS-G target deceleration G _BS is determined according to the map revised target deceleration from the determination of the final target deceleration G _F based on the target deceleration G _AC0 G it is to facilitate the transition to the determination of the final target deceleration G _F based on _BS.

Specifically, the braking torque mediation unit 36, for upward adjustment by correction coefficient alpha target deceleration G _BS determined in accordance with BS-G map (corrected target deceleration _{G BS '= (1 + α} ) × G BS). Then, similarly to Example 1 described above, the braking torque arbitration section 36, the two target deceleration G _AC0 and the target deceleration G _BS, determines larger target deceleration as the final target deceleration G _F. Here, the target deceleration G _BS does not exceed the target deceleration G _AC0, corrected target deceleration G _BS 'is assumed to exceed the target deceleration G _AC0. In this case, as shown in FIG. 8, the corrected target deceleration G _BS from 'the time t3 which exceeds the target deceleration G _AC0', the corrected target deceleration G _BS ', the target decrease according to the non-operation position of the accelerator pedal The final target deceleration G _F is determined in preference to the speed G _AC0 .

Accordingly, the corrected target deceleration _GBS ′ is determined as the final target deceleration G _F even in the brake pedal depression release process. However, in this case, the correction coefficient α described above is brought close to zero as the operation amount of the brake pedal decreases. Specifically, the correction coefficient α is initially set to a relatively large value (for example, 0.25), and when a brake pedal operation release start operation is detected, the correction coefficient α gradually decreases as the operation amount decreases. Finally, when the operation amount of the brake pedal becomes zero, it is changed to zero.

  Accordingly, in this embodiment, as in the above-described embodiments, control is performed such that zero acceleration / deceleration is realized when the operation of the brake pedal is completely released. The deceleration mode is in line with the driver's intention, and an operational feeling without a sense of incongruity can be realized.

Further, in this embodiment, the operation of the brake pedal is started, is changed the characteristics of the brake pedal, since the brake pedal operation dominate the final target deceleration G _F is rapidly achieved (i.e. switching Since the time point t3 ′ becomes earlier, the driver's intention to brake can be reflected quickly. Further, when the operation of the brake pedal starts to be released, the brake pedal is changed so as to converge to the original characteristic of the brake pedal, so that it is possible to realize the release operation of the brake pedal without a sense of incongruity.

FIG. 9 is an explanatory diagram illustrating a second embodiment of the arbitration mode realized in the braking torque arbitration unit 36. Similarly, FIG. 9 shows time-series changes in the target deceleration in the process of the driver releasing the accelerator pedal and depressing the brake pedal. FIG. 9A shows the AC-G map. target deceleration G _AC changes history is determined is shown along with the operation history of the accelerator pedal, the FIG. 9 (B), the change history of the target deceleration G _BS determined in accordance with BS-G map, It is shown along with the operation history of the brake pedal. The explanation of the times t1 to t7 related to the operation history of the accelerator pedal and the brake pedal is the same as described above.

In this embodiment, the braking torque mediation unit 36 determines the sum of the two target deceleration G _AC0 and target deceleration G _BS as the final target deceleration G _{F (i.e., G F = G AC0 + G} BS). Thus, in this example, as shown by a solid line in FIG. 9 (C), the after time target deceleration G _BS begins to occur t2 is the target deceleration G _BS by the operation of the brake pedal, non-operation of the accelerator pedal The sum of the target deceleration G _AC0 related to the position is determined as the final target deceleration G _F. Therefore, in the present embodiment, as shown in FIG. 9C, the final target deceleration G _F starts to increase from the start of the operation of the brake pedal, and therefore a braking force larger than the target deceleration G _AC0 is applied. It can occur from an early stage (time t2 in this example).

In the brake pedal depression release process (i.e., t5 to t7), the braking torque arbitration unit 36, as shown in FIG. 9C, from the same viewpoint as each of the above-described embodiments, the brake pedal release completion time t7, that final target deceleration G _F at time t7 when the brake pedal operation is released completely so that zero, to determine the final target deceleration G _F corresponding to each operating position of the brake pedal. Specifically, the braking torque mediation unit 36, when the release start operation of the brake pedal operation is detected, still, the sum of the two target deceleration G _AC0 and target deceleration G _BS as the final target deceleration G _F Although determined, the same correction as that in the second embodiment is applied to the target deceleration G _AC0 . That is, the braking torque adjusting unit 36 corrects the target deceleration G according to the brake pedal operation amount BS according to the decrease gradient k (= _GAC0 / BS1) determined by the brake pedal operation amount BS1 at the start of the brake pedal operation release. _AC0 ′ (= G _AC0 −k (BS1−BS)) is determined. Accordingly, the final target deceleration is calculated as _{+ G BS 'G F = G} AC0 using' corrected target deceleration G _AC0.

  As described above, according to this embodiment, as in the above-described embodiments, since the acceleration / deceleration is controlled to be zero when the operation of the brake pedal is completely released, the vehicle with respect to the release operation of the brake pedal is controlled. This mode of deceleration is in line with the driver's intention, and an operational feeling without a sense of incongruity can be realized.

  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.

  For example, in the above description, each embodiment is described separately to facilitate understanding of the invention. However, the embodiments can be appropriately combined.

In addition to the above, the final target deceleration G _F can be determined in various ways other than the above. For example, as shown by a solid line in FIG. 10, the final target deceleration G _F is obtained by _{combining a} target deceleration G _AC0 related to the non-operating position of the accelerator pedal and a maximum target deceleration Gmax related to the maximum operating position of the brake pedal. It may be determined to change along the connecting gradient. That is, the final target deceleration G _F is with an increase in the operation amount of the brake pedal, the target deceleration G _AC0 according to the non-operation position of the accelerator pedal, the maximum target deceleration Gmax of the maximum operating position of the brake pedal It may be an increasing number. (FIG. 10 shows a curve of the final target deceleration G _F when the brake pedal is operated to the maximum operating position). Thus, embodiments of plus a target deceleration G _BS to the target deceleration G _AC0 may optionally be properly adjusted and set.

In Example 1 and Example 4 described above, the target deceleration G _BS or corrected target deceleration G _BS 'is employed from the time t3 to exceeds the target deceleration G _AC0 as the final target deceleration G _{F Alternatively} , the final target deceleration G _F may be adopted from the time when a predetermined threshold different from the target deceleration G _AC0 is _exceeded .

  In the above-described embodiments, the acceleration / deceleration of the vehicle is adopted as a physical quantity representing the movement in the longitudinal direction of the vehicle for easy understanding of the invention. A physical quantity or other physical quantity related thereto may alternatively be used, or vehicle acceleration / deceleration may be used in combination with other physical quantities.

  Further, in each of the above-described embodiments, the braking force generator and / or the driving force generator is controlled in an open loop by adding the running resistance torque to the target acceleration / deceleration determined by the target acceleration / deceleration calculation device 20. However, the present invention does not exclude performing feedback control based on vehicle speed information obtained from a vehicle speed sensor. It is also possible to perform feedback control based on vehicle speed information so that the target acceleration / deceleration is realized.

In addition, the change mode in which the final target deceleration G _F decreases toward zero as the brake pedal operation amount decreases does not need to be linear as in the above example or illustration, but changes nonlinearly. It may be.

  In addition, the AC-G map and the BS-G map are not limited to those shown in the above-described figure. For example, for the AC-G map, the dead zone region has a fixed area as shown in FIG. Although it may be a region having a width (AC1 to AC2), it may be a region having no width, that is, a point. In this case, the change gradient of the target acceleration / deceleration before and after the dead zone may be gentler than that of the deceleration region and the acceleration region.

  Also, a plurality of AC-G maps and BS-G maps having different characteristic patterns may be prepared, and these may be switched appropriately according to the driving environment during vehicle driving and the user's selection. Further, a filter may be applied to the target acceleration / deceleration (that is, annealing may be added) in order to absorb the shock at the time of switching (suppressing a step difference in the target acceleration / deceleration).

1 is a system configuration diagram showing an embodiment of an acceleration / deceleration control apparatus according to the present invention. 3 is a functional block diagram illustrating an example of a target acceleration / deceleration calculation device 20. FIG. 4 is a functional block diagram illustrating an example of a drive torque manager 40. FIG. 2 is a functional block diagram illustrating an example of a brake manager 50. FIG. 5A shows an example of an AC-G map used in the AC-G map processing unit 22, and FIG. 5B shows an example of a BS-G map used in the BS-G map processing unit 32. Show. It is a figure which shows the mediation aspect implement | achieved in the braking torque mediation part 36 which concerns on Example 1. FIG. It is a figure which shows the mediation aspect implement | achieved in the braking torque mediation part 36 which concerns on Example 2. FIG. It is a figure which shows the mediation aspect implement | achieved in the braking torque mediation part 36 which concerns on Example 3. FIG. It is a figure which shows the mediation aspect implement | achieved in the braking torque mediation part 36 which concerns on Example 4. FIG. It is a figure which shows the mediation aspect implement | achieved in the braking torque mediation part 36 which concerns on an alternative Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Acceleration / deceleration control device 12 Accelerator opening sensor 20 Target acceleration / deceleration calculation device 36 Braking torque arbiter 40 Drive torque manager 50 Brake manager

Claims (6)

An accelerator pedal having a deceleration region and an acceleration region in the operation stroke, the non-operation position belonging to the deceleration region;
A brake pedal having a deceleration area in the operation stroke and capable of requesting a deceleration greater than the maximum deceleration that can be requested by operating the accelerator pedal;
Based on the predetermined first non-zero target deceleration corresponding to the non-operating position of the accelerator pedal and the second target deceleration corresponding to each operating position of the brake pedal for the operation of the brake pedal, Arbitration means for determining deceleration;
A braking force generator that operates according to the final target deceleration,
The arbitration means performs the arbitration so that the final target deceleration becomes zero when the brake pedal operation is completely cancelled. An accelerator pedal having a deceleration region and an acceleration region in the operation stroke, the non-operation position belonging to the deceleration region;
A brake pedal having a deceleration area in the operation stroke and capable of requesting a deceleration greater than the maximum deceleration that can be requested by operating the accelerator pedal;
Based on the predetermined first non-zero target deceleration corresponding to the non-operating position of the accelerator pedal and the second target deceleration corresponding to each operating position of the brake pedal for the operation of the brake pedal, Arbitration means for determining deceleration;
A braking force generator that operates according to the final target deceleration,
The arbitration means determines a final target deceleration based on the first target deceleration for an operation of a brake pedal for which the second target deceleration does not exceed a predetermined value, and performs an operation for releasing the brake pedal. An acceleration / deceleration control device that changes the first target deceleration when the detection is detected.   The acceleration / deceleration control device according to claim 2, wherein the arbitration unit performs the change so that the first target deceleration approaches zero as the operation of the brake pedal is released.   The arbitration means, in one operation step of the brake pedal, after the second target deceleration exceeds a predetermined value as the amount of operation of the brake pedal increases, the final target is based only on the second target deceleration. The acceleration / deceleration control device according to any one of claims 1 to 3, wherein a deceleration is determined.   The arbitration means derives a second target deceleration obtained by correcting the second target deceleration upward, and after the second corrected target deceleration increased above a predetermined value in one operation process of the brake pedal, The acceleration / deceleration control apparatus according to any one of claims 1 to 3, wherein a final target deceleration is determined based only on the second target deceleration corrected upward.   The degree of upward correction of the second target deceleration by the arbitration means is greater in a process of increasing the brake pedal in a process of operating the brake pedal than in a process of decreasing the brake pedal. Item 6. The acceleration / deceleration control device according to Item 5.

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