Acceleration / deceleration control device

Abstract

Provided is an acceleration / deceleration control device with which it is possible to accurately determine the proficiency of a single pedal operation by a driver. An acceleration / deceleration control device (1) is provided with a processor. A processor that, when the vehicle is decelerating, changes the deceleration at which the accelerator is turned off from an initial value to a weaker value as the frequency of a re-treading operation for turning on the accelerator immediately after a person's perceivable time is higher after an operation for turning off the accelerator is performed; on the other hand, the deceleration at which the accelerator is turned off is changed from an initial value to a higher value as the frequency of a re-treading operation at which the accelerator is turned on immediately after the perceivable time of the person is lower.

Description

Technical Field

[0001] The present disclosure relates to an acceleration / deceleration control device. Background Art

[0002] Patent Document 1 describes a technique for suppressing the discomfort a driver experiences before becoming accustomed to the one-pedal driving function. In this technique, in a vehicle capable of single-pedal acceleration and deceleration, the driver's proficiency with the one-pedal driving function is calculated. As proficiency increases, the amount of deceleration force suppressed by the one-pedal function is reduced.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2021-146777. Summary of the Invention Problems to be solved by the invention

[0004] However, in Patent Document 1 described above, since the proficiency of the single-pedal operation is determined based only on the simple operation result of the driver, there is a problem in that the estimation accuracy of the driver's proficiency in the single-pedal operation is low.

[0005] The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide an acceleration / deceleration control device capable of determining the driver's proficiency in single-pedal operation with high accuracy. Means for solving problems

[0006] In order to solve the above-mentioned problems and achieve the purpose, the acceleration and deceleration control device involved in the present disclosure controls the acceleration and deceleration of a vehicle through a single pedal. The acceleration and deceleration control device includes a processor. When the vehicle is decelerating, after the operation of turning off the accelerator is performed, the higher the frequency of the re-stepping operation to turn on the accelerator immediately after a human-recognizable time is, the weaker the deceleration of the accelerator turning off is changed from an initial value; on the other hand, the lower the frequency of the re-stepping operation to turn on the accelerator immediately after a human-recognizable time is, the stronger the deceleration of the accelerator turning off is changed from the initial value. Effects of the Invention

[0007] According to the present disclosure, it is possible to determine the driver's proficiency in one-pedal operation with high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a block diagram showing the functional configuration of the acceleration / deceleration control device according to the first embodiment. Figure 2 This is a flowchart showing an overview of processing executed by the acceleration / deceleration control device according to the first embodiment. Figure 3 This is a diagram schematically illustrating temporal changes in vehicle speed and accelerator opening when the driver's pedal is depressed again without the driver's intention. Figure 4 Graph showing the relationship between the driver's re-stepping operation frequency and the driver's preference. Figure 5 Graph showing the influence of vehicle deceleration intensity. Figure 6 This is a block diagram showing the functional configuration of the acceleration / deceleration control device according to the second embodiment. Figure 7 This is a flowchart showing an overview of processing executed by the acceleration / deceleration control device according to the second embodiment. DETAILED DESCRIPTION

[0009] The acceleration / deceleration control device according to the embodiment of the present disclosure is described below with reference to the accompanying drawings. Furthermore, the constituent elements in the following embodiments include elements that can be easily replaced by those skilled in the art, or elements that are substantially the same. Furthermore, the figures referenced in the following description merely schematically illustrate shapes, sizes, and positional relationships to facilitate understanding of the contents of the present disclosure. That is, the present disclosure is not limited to the shapes, sizes, and positional relationships illustrated in the figures.

[0010] (Implementation Method 1) [Structure of acceleration and deceleration control device] Figure 1 This is a block diagram showing the functional configuration of the acceleration / deceleration control device according to the first embodiment. Figure 1 The illustrated acceleration / deceleration control device 1 is installed in a vehicle capable of single-pedal operation, such as an FCEV (Fuel Cell Electric Vehicle), an HEV (Hybrid Electric Vehicle), an EV (Electric Vehicle), or a PHEV (Plug-in Hybrid Electric Vehicle). The acceleration / deceleration control device 1 includes a detection device 2, a drive device 3, a recording unit 4, and a control device 5.

[0011] Detection device 2 detects the accelerator position relative to a pedal installed on the vehicle, the vehicle speed, and whether the ignition switch (hereinafter referred to as "IG") is on or off, and outputs the detection results to control device 5. Detection device 2 is composed of an accelerator position sensor, a vehicle speed sensor, an acceleration sensor, and an ignition switch detection sensor.

[0012] The drive device 3 is configured to drive the vehicle using, for example, a plurality of motors, an inverter, a battery, an engine, a motor generator, front wheels, rear wheels, and a speed reducer. The drive device 3 is driven under the control of the control device 5 .

[0013] The recording unit 4 records various information related to the acceleration / deceleration control device 1. The recording unit 4 is configured using flash memory, volatile memory, nonvolatile memory, a hard disk drive (HDD), or a solid state drive (SSD). The recording unit 4 includes a re-depression frequency information recording unit 41. This re-depression frequency information recording unit 41 records the number of decelerations during vehicle operation and the number of re-depressions by the driver with the accelerator off. Here, "while the vehicle is operating" refers to the period when the IG switches from the on state to the off state.

[0014] The control device 5 is implemented using memory and a processor with hardware. Examples of this hardware include memory, a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and an FPGA (Field-Programmable Gate Array). Based on the various detection results input from the detection device 2, the control device 5 controls the acceleration and deceleration of the vehicle by controlling the drive device 3. The control device 5 includes a setting unit 51, a determination unit 52, a calculation unit 53, and a change unit 54. Furthermore, in the first embodiment, the control device 5 functions as a processor.

[0015] The setting unit 51 sets the strong deceleration (deceleration characteristics) at accelerator OFF as an initial value. Specifically, the setting unit 51 sets the highest deceleration value as the initial value for the initial deceleration setting at accelerator OFF.

[0016] The determination unit 52 determines whether the vehicle has decelerated based on the detection result of the detection device 2 .

[0017] The calculation unit 53 calculates the frequency of the driver's pedal re-depression during a certain period based on the detection result of the detection device 2 and the re-depression frequency information recorded in the re-depression frequency information recording unit 41 .

[0018] The changing unit 54 changes the accelerator-off deceleration rate based on the initial value of the accelerator-off deceleration rate set by the setting unit 51 , according to the pedaling frequency calculated by the calculating unit 53 .

[0019] [Processing performed by the acceleration / deceleration control device] Next, the processing executed by the acceleration / deceleration control device 1 will be described. Figure 2 1 is a flowchart showing an outline of the processing executed by the acceleration / deceleration control device 1 .

[0020] like Figure 2As shown, first, the setting unit 51 sets the strong deceleration (deceleration characteristics) for accelerator OFF as the initial value (step S1). Specifically, the setting unit 51 sets the highest deceleration value as the initial value for the initial deceleration setting for accelerator OFF. Compared with the case of weak deceleration, the driver's re-operation of the accelerator pedal is more likely to occur when the deceleration is strong (for example, see Figure 5 ( , straight line L11 represents the relationship between the driver's re-depression operation frequency and the driver's preference in the case of strong deceleration (high sensitivity), and straight line L12 represents the relationship between the driver's re-depression operation frequency and the driver's preference in the case of weak deceleration (low sensitivity). Therefore, the setting unit 51 sets the value with the strongest deceleration as the initial value for the initial deceleration setting for accelerator off, thereby improving the speed and accuracy of detecting whether the driver's deceleration characteristics are suitable.

[0021] Next, the determination unit 52 determines whether the vehicle has decelerated based on the detection result of the detection device 2 (step S2). If the determination unit 52 determines that the vehicle has decelerated (step S2: Yes), the acceleration / deceleration control device 1 proceeds to step S3, described below. In contrast, if the determination unit 52 determines that the vehicle has not decelerated (step S2: No), the acceleration / deceleration control device 1 proceeds to step S5.

[0022] In step S3 , the calculation unit 53 calculates the pedal re-depression frequency of the driver during a certain period based on the detection result of the detection device 2 and the re-depression frequency information recorded by the re-depression frequency information recording unit 41 .

[0023] Figure 3 This figure schematically illustrates the temporal changes in vehicle speed and accelerator opening when the driver steps on the pedal again without following his / her intention. Figure 3 In the figure, the horizontal axis represents time and the vertical axis represents vehicle speed or accelerator opening. Figure 3 In FIG, curve L1 represents the vehicle speed, and curve L2 represents the accelerator opening.

[0024] like Figure 3As shown in curves L1 and L2, the calculation unit 53 calculates the re-depression frequency by dividing the frequency (number of times) the accelerator is fully closed during a specified period of time when the vehicle is decelerating by the total number of decelerations during driving. Here, the specified period is, for example, a time period within a certain number (e.g., 2 seconds) of human information processing (e.g., 250 ms / time). Furthermore, the total number of decelerations during driving refers to the number of decelerations during the period from when the IG is turned on to when the IG is turned off. As a result, when the vehicle is decelerating, the calculation unit 53 calculates the re-depression frequency by dividing the frequency (number of times) the accelerator is fully closed by the total number of decelerations during driving recorded in the re-depression frequency information recording unit 41 of the recording unit 4.

[0025] return Figure 2 , continue with the description after step S4. In step S4 , the changing unit 54 changes the accelerator-off deceleration rate based on the initial value of the accelerator-off deceleration rate set by the setting unit 51 , according to the pedaling frequency calculated by the calculating unit 53 .

[0026] Figure 4 : is a graph showing the relationship between the driver's re-stepping operation frequency and the driver's preference. Figure 4 In the figure, the vertical axis represents the re-pedaling frequency during deceleration, and the horizontal axis represents the driver's preference. Figure 4 The straight line L10 represents the relationship between the driver's re-depression operation frequency and the driver's preference.

[0027] For example, Figure 4 As shown by straight line L10, the higher the frequency with which the driver re-presses the accelerator during vehicle deceleration, the weaker the deceleration when the accelerator is closed. Conversely, the lower the frequency with which the driver re-presses the accelerator during vehicle deceleration, the stronger the deceleration when the accelerator is closed. This allows the accelerator deceleration to be matched to the driver's current state (preference).

[0028] return Figure 2 , continue with the description after step S5. In step S5 , if the IG is disconnected (step S5 : Yes), the acceleration / deceleration control device 1 ends the present process. On the other hand, if the IG is not disconnected (step S5 : No), the acceleration / deceleration control device 1 returns to step S3 .

[0029] According to the first embodiment described above, the changing unit 54 changes the initial value of the accelerator-off deceleration set by the setting unit 51 to the accelerator-off deceleration based on the re-pedaling frequency calculated by the calculating unit 53, thereby being able to judge the driver's proficiency in single-pedal operation with high accuracy.

[0030] (Implementation Method 2) Next, Embodiment 2 will be described. In Embodiment 1, when the ignition switch is turned on, the initial value of the accelerator-off deceleration is set to the highest value as the initial value, but it is set to a deceleration that is relevant to the driver. The following describes the structure of the acceleration / deceleration control device according to Embodiment 2, followed by a description of the processing performed by the acceleration / deceleration control device according to Embodiment 2. Components identical to those of the acceleration / deceleration control device according to Embodiment 1 are denoted by the same reference numerals, and detailed descriptions thereof are omitted.

[0031] [Structure of acceleration and deceleration control device] Figure 6 This is a block diagram showing the functional configuration of the acceleration / deceleration control device according to the second embodiment. Figure 6 The illustrated acceleration / deceleration control device 1A includes, in addition to the functional configuration of the acceleration / deceleration control device 1 according to the first embodiment, a driver detection device 6. Furthermore, the acceleration / deceleration control device 1A includes a recording unit 4A and a control device 5A instead of the recording unit 4 and the control device 5 of the acceleration / deceleration control device 1 according to the first embodiment.

[0032] The driver detection device 6 detects the driver of the vehicle and outputs the detection result to the control device 5A. Specifically, the driver detection device 6 detects the driver's face using a known pattern matching process and outputs the detection result to the control device 5A. The driver detection device 6 is configured using a camera or the like.

[0033] Recording unit 4A includes a driver information recording unit 42 in addition to the configuration of recording unit 4 according to Embodiment 1. Driver information recording unit 42 records driver information for each driver identification information identifying the driver, which sets the initial value of the accelerator-off deceleration.

[0034] The control device 5A includes a recording control unit 55 in addition to the functional configuration of the control device 5 according to Embodiment 1. In addition, in Embodiment 2, the control device 5A functions as a processor.

[0035] The recording control unit 55 records the current deceleration when the accelerator is off in association with the driver identification information in the driver information recording unit 42 .

[0036] [Processing of acceleration and deceleration control device] Next, the processing executed by the acceleration / deceleration control device 1A will be described. Figure 7 1A is a flowchart showing an outline of processing executed by the acceleration / deceleration control device 1A.

[0037] like Figure 7As shown, the determination unit 52 determines driver identification information for identifying the driver based on the driver's face detected by the driver detection device 6 and the driver information recorded by the driver information recording unit 42 (step S10). Specifically, the determination unit 52 determines whether the driver identification information (driver ID) is recorded in the driver information recorded by the driver information recording unit 42, which contains the characteristic pattern of the driver's face detected by the driver detection device 6.

[0038] Next, if the determination unit 52 determines that driver identification information exists in the driver information recording unit 42, the setting unit 51 sets the accelerator-off deceleration rate to the value corresponding to the driver identification information (driver ID) of the driver determined by the determination unit 52 (step S11). If the determination unit 52 determines that driver identification information does not exist in the driver information recording unit 42, the setting unit 51 sets the accelerator-off deceleration rate to an initial value. Specifically, the setting unit 51 sets the highest deceleration value as the initial value for the initial deceleration rate setting for accelerator-off.

[0039] Steps S12 to S15 and Figure 2 Since the steps S2 to S5 correspond to each other, detailed descriptions are omitted. After step S15, the acceleration / deceleration control device 1A proceeds to step S16.

[0040] In step S16, the recording control unit 55 associates the current deceleration when the accelerator is off with the driver identification information and records them in the driver information recording unit 42. After step S16, the acceleration / deceleration control device 1A ends this process.

[0041] According to the second embodiment described above, when the driver identification information is determined by the determination unit 52, the setting unit 51 sets the deceleration for accelerator OFF associated with the driver (driver identification information), thereby being able to set the deceleration suitable for the driver at the beginning just after the IG is turned on. (Other methods) Those skilled in the art will readily derive further effects and modifications. The broader aspects of the present invention are not limited to the specific detailed and representative embodiments shown and described above. Therefore, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

[0042] While several embodiments of the present application have been described in detail above with reference to the drawings, these are merely examples, and the present invention can be implemented in other forms that are variously modified and improved based on the knowledge of those skilled in the art, including the forms described in this specification. Description of Reference Numerals

[0043] 1. 1A acceleration and deceleration control device 2 Detection device 3 drive device 4. 4A Records Department 5.5A control device 6. Driver detection device 41 Frequency information recording unit 42 Driver Information Recording Unit 51 Setting Department 52 Judgment Department 53 Computing Department 54 Change Department 55 Recording control unit.

Claims

1. An acceleration and deceleration control device that controls the acceleration and deceleration of a vehicle through a single pedal. The acceleration / deceleration control device includes a processor, When the vehicle is decelerating, the processor changes the deceleration of the accelerator closing from the initial value to a weaker value the higher the frequency of the operation of stepping on the accelerator again to turn on the accelerator immediately after a time that is recognizable to humans. On the other hand, the processor changes the deceleration of the accelerator closing from the initial value to a stronger value the lower the frequency of the operation of stepping on the accelerator again to turn on the accelerator immediately after a time that is recognizable to humans.

2. The acceleration / deceleration control device according to claim 1, wherein: The processor sets an initial value of the accelerator-off deceleration to a maximum value.

3. The acceleration / deceleration control device according to claim 1, wherein: The processor sets the accelerator-off deceleration to an accelerator-off deceleration corresponding to driver identification information, the driver identification information being information identifying a driver driving the vehicle.

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