JP7400563B2 - Deceleration force suppression device - Google Patents

Description

The present invention relates to a deceleration force suppressing device.

In vehicles that have a one-pedal drive function that allows both acceleration and deceleration with a single pedal, drivers are often unfamiliar with operating a single pedal, so it is desirable to further improve driver operability. It is rare.

In particular, when adjusting the braking force, the pedal may not be operated appropriately, resulting in insufficient or excessive pedal operation, and braking controllability may deteriorate.

Patent Document 1 discloses that in a vehicle that can both accelerate and decelerate with a single pedal, operability and braking performance are improved by changing the deceleration according to the amount of pedal operation when the pedal is pressed back. It is stated that

Japanese Patent Application Publication No. 2016-141232

However, the one-pedal drive function decelerates the vehicle until it stops by pressing back on the pedal, and compared to a vehicle that operates the normal accelerator and brake pedals, the feeling of deceleration when pressing back on the pedal is stronger. The driver may feel a sense of discomfort until he or she gets used to driving the vehicle.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a deceleration force suppressing device that can suppress the discomfort that a driver feels until he or she gets used to the one-pedal drive function.

In order to solve the above-mentioned problems, the present invention provides a deceleration force suppressing device for a vehicle having a one-pedal drive function capable of controlling the vehicle from acceleration/deceleration to stopping according to the operation state of one pedal. a control unit that calculates a driver's proficiency level with the one-pedal drive function, and reduces the amount of suppression of deceleration force by the one-pedal drive function as the proficiency level increases; The greater the number of decelerations by operating the pedal when using the drive function, the higher the proficiency level is.

As described above, according to the present invention, it is possible to suppress the discomfort that the driver feels until he or she gets used to the one-pedal drive function.

FIG. 1 is a block diagram of a deceleration force suppressing device according to an embodiment of the present invention. FIG. 2 is a diagram showing an example of the amount of suppression of deceleration force according to the proficiency level of the deceleration force suppression device according to an embodiment of the present invention. FIG. 3 is a flowchart showing the procedure of the deceleration force suppression control process of the deceleration force suppression device according to an embodiment of the present invention.

A deceleration force suppressing device according to an embodiment of the present invention is a decelerating force suppressing device for a vehicle having a one-pedal drive function that can control the vehicle from acceleration/deceleration to stopping according to the operation state of one pedal. The vehicle driver is configured to include a control unit that calculates the level of proficiency of the vehicle driver with the one-pedal drive function, and the higher the level of proficiency, the smaller the amount of suppression of deceleration force by the one-pedal drive function.

As a result, the deceleration force suppressing device according to the embodiment of the present invention can suppress the discomfort that the driver feels until he or she gets used to the one-pedal drive function.

EMBODIMENT OF THE INVENTION Hereinafter, with reference to drawings, the deceleration force suppression device based on the Example of this invention is demonstrated in detail.

In FIG. 1, a vehicle 1 equipped with a deceleration force suppressing device according to an embodiment of the present invention includes a drive motor 2, a display section 4, and a control section 5.

The drive motor 2 is, for example, a synchronous motor including a rotor in which a plurality of permanent magnets are embedded and a stator around which a stator coil is wound. In the drive motor 2, a rotating magnetic field is formed in the stator by applying three-phase AC power to the stator coil, and the rotor is rotated by this rotating magnetic field to generate driving force.

Further, the drive motor 2 is driven so as to utilize rotational resistance during power generation for braking the vehicle 1. Thereby, the drive motor 2 has a function of generating electricity through regeneration.

The rotating shaft of the drive motor 2 is connected to the wheels 3 via a reducer and a drive shaft (not shown). The drive motor 2 drives the wheels 3.

The display section 4 is configured by a liquid crystal display device or the like. The display unit 4 displays various information and notifies the driver.

The control unit 5 is constituted by a computer unit including a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), an input port, and an output port.

The ROM of the control section 5 stores various control constants, various maps, etc., as well as programs for causing the computer unit to function as the control section 5. That is, the computer unit functions as the control section 5 by the CPU executing the program stored in the ROM.

Various sensors including a suppression control cancel switch 51, a user identification section 52, an accelerator opening sensor 53, and a brake switch 54 are connected to the input port of the control section 5. On the other hand, various control objects including the aforementioned drive motor 2 and the display section 4 are connected to the output port of the control section 5.

The suppression control cancel switch 51 receives a driver's operation and outputs an on signal or an off signal. If the ON signal is output from the suppression control cancel switch 51, the control unit 5 does not perform deceleration force suppression control that suppresses the deceleration when the pedal of the one-pedal drive function is released. Moreover, if the off signal is output from the suppression control cancel switch 51, the control unit 5 performs deceleration force suppression control.

The user identification unit 52 identifies the driver who drives the vehicle 1. The user identification unit 52 identifies the driver based on the input of user identification information through the driver's operation, user authentication using a smartphone, weight, and the like.

The accelerator opening sensor 53 detects the opening of an accelerator pedal (not shown) operated by the driver.

The brake switch 54 detects whether a brake pedal (not shown) has been depressed by the driver.

When using the one-pedal drive function is selected by a one-pedal drive mode switch (not shown), the control unit 5 controls the power (driving force and braking force) of the drive motor 2 according to the operating state of the accelerator pedal. The vehicle 1 is controlled from acceleration/deceleration to stopping.

When the one-pedal drive function is being used and the suppression control cancel switch 51 is outputting an off signal, the control unit 5 controls the one-pedal drive function according to the driver's proficiency level with the one-pedal drive function. Suppresses the deceleration force caused by the function.

The control unit 5 calculates the driver's proficiency level with the one-pedal drive function. The control unit 5 determines the driver's proficiency level with the one-pedal drive function based on, for example, the distance traveled, the number of times the brake pedal is depressed, and the number of times the driver decelerates by releasing the accelerator pedal while using the one-pedal drive function. calculate. For example, the number of decelerations caused by releasing the accelerator pedal is counted as one if the deceleration is equal to or greater than a predetermined value.

As for the distance traveled while using the one-pedal drive function, the longer the distance traveled, the higher the proficiency level. This is because the longer the distance traveled, the greater the experience of driving using the one-pedal drive function. For example, the control unit 5 increments the mileage counter by one every time the mileage reaches 10 km.

Regarding the number of times the brake pedal is depressed while using the one-pedal drive function, the proficiency level is lowered as the number of times the brake pedal is depressed is greater. This is because if the brake pedal is pressed many times, it means that deceleration by releasing the accelerator pedal, that is, deceleration by using the one-pedal drive function, is not being utilized much. Depression of the brake pedal is detected by the brake switch 54. For example, the control unit 5 counts down the brake pedal depression count by one every time the brake pedal is depressed.

Regarding the number of decelerations caused by releasing the accelerator pedal while using the one-pedal drive function, the proficiency level is increased as the number of decelerations caused by releasing the accelerator pedal increases. This is because a large number of decelerations caused by releasing the accelerator pedal means that the one-pedal drive function is frequently used. For example, the control unit 5 increments a counter for the number of times of deceleration due to release of the accelerator pedal by one for each time of deceleration due to release of the accelerator pedal.

Note that if the deceleration caused by releasing the accelerator pedal is low, there is a possibility that the deceleration is due to switching to the brake pedal. If the deceleration is less than a predetermined value, it is not reflected in the proficiency level.

The proficiency level Pr is calculated by the following formula based on the values of a counter for travel distance, a counter for the number of times the brake pedal is depressed, and a counter for the number of decelerations caused by releasing the accelerator pedal.
Proficiency level Pr = K1 x mileage - K2 x number of times the brake pedal is pressed + K3 x number of decelerations due to release of the accelerator pedal Here, K1, K2, and K3 are weighting coefficients, and are arbitrarily set by the control unit 5. For example, if the number of decelerations caused by releasing the accelerator pedal is large, it can be determined that the vehicle is accustomed to one-pedal operation, so K3 is set high as the weighting coefficient. Further, if it is determined that the vehicle is traveling a long distance as before, K1 and K2 are set to the same level in order to delay the increase in proficiency level.

Furthermore, the weighting coefficient may be changed depending on the age of the driver. For example, it is thought that it takes longer for elderly people to learn how to operate a one-pedal system compared to younger people, so by setting the weighting coefficient lower than for young people, the time it takes to complete mastery can be lengthened. Try to get used to it gradually.

When the proficiency level Pr reaches a predetermined value, the control unit 5 determines that the proficiency is complete, and sets the deceleration force to the deceleration force original to the one-pedal operation.

The higher the level of proficiency, the more the control unit 5 sets the deceleration force to a value closer to the deceleration force inherent in one-pedal operation.

The amount of suppression of deceleration force depending on the proficiency level may be set in a plurality of patterns as shown in FIG. The line a in FIG. 2 shows the case where the amount of suppression of the deceleration force is linearly canceled (decreased) according to the skill level. The line b in FIG. 2 shows a case where the amount of cancellation of the suppression amount of deceleration force is made small while the learning level is low, and the amount of cancellation is gradually increased.

For example, if the proficiency level increases quickly, by releasing the suppression of the deceleration force linearly as shown by the line a in Figure 2, it is possible to feel that the suppression of the deceleration force is lifted, and conversely, If the increase in speed is slow, the suppression of the deceleration force is gradually released as shown by the line b in FIG. 2, thereby reducing the discomfort caused by the release of suppression of the deceleration force becoming large.

The control unit 5 stores the proficiency level for each driver identified by the user identification unit 52, and updates the proficiency level for each driver.

Deceleration force suppression control processing by the deceleration force suppression device according to the present embodiment configured as above will be described with reference to FIG. 3. Note that the deceleration force suppression control process described below is started when the control unit 5 starts operating, and is executed at preset time intervals.

In step S1, the control unit 5 determines whether the suppression control cancel switch 51 is outputting an on signal. If it is determined that the suppression control cancel switch 51 is outputting an on signal, the control unit 5 executes the process of step S7.

If it is determined that the suppression control cancel switch 51 is not outputting an on signal, the control unit 5 executes the process of step S2.

In step S2, the control unit 5 identifies the driver using the user identification unit 52. After executing the process in step S2, the control unit 5 executes the process in step S3.

In step S3, the control unit 5 determines whether the identified driver has completed learning. If it is determined that the identified driver has completed the training, the control unit 5 executes the process of step S7.

If it is determined that the identified driver has not completed the proficiency, the control unit 5 executes the process of step S4.

In step S4, the control unit 5 causes the display unit 4 to display the proficiency level of the identified driver. After executing the process in step S4, the control unit 5 executes the process in step S5.

In step S5, the control unit 5 causes the display unit 4 to display the state of suppressing the deceleration force due to one-pedal driving according to the identified driver's proficiency level. After executing the process in step S5, the control unit 5 executes the process in step S6.

In step S6, the control unit 5 suppresses the deceleration force according to the identified driver's skill level. After executing the process of step S6, the control unit 5 ends the deceleration force suppression control process.

In step S7, the control unit 5 hides the display of the proficiency level on the display unit 4. After executing the process in step S7, the control unit 5 executes the process in step S8.

In step S8, the control unit 5 hides the display of the state in which the deceleration force is suppressed by the one-pedal drive on the display unit 4. After executing the process in step S8, the control unit 5 executes the process in step S9.

In step S9, the control unit 5 does not suppress the deceleration force. After executing the process of step S9, the control unit 5 ends the deceleration force suppression control process.

In this way, in this embodiment, the control unit 5 reduces the amount of suppression of deceleration force in the one-pedal drive function as the skill level increases.

As a result, the higher the driver's proficiency level is, the smaller the amount of suppression of the deceleration force is, and it is possible to suppress the discomfort felt by a driver who is unfamiliar with the one-pedal drive function when operating the accelerator pedal.

Further, the control unit 5 increases the proficiency level as the number of decelerations due to the release of the accelerator pedal increases. Implementing deceleration by releasing the accelerator pedal means using one-pedal drive to decelerate or stop the vehicle 1, so the more times the driver decelerates by releasing the accelerator pedal, the higher the proficiency level.

As a result, the more times a driver decelerates due to the release of the accelerator pedal, the more proficiency level increases, and if it is determined that the driver is using the one-pedal drive function, the proficiency level is increased. It is possible to suppress discomfort during operation.

Further, the control unit 5 increases the proficiency level as the distance traveled using the one-pedal drive function increases. If the distance traveled using the one-pedal drive function is long, it means that time is spent using the one-pedal drive function, so the proficiency level is increased each time the distance traveled exceeds a predetermined distance.

As a result, the longer the distance traveled using the one-pedal drive function, the higher the proficiency level will be, and if it is determined that the driver is using the one-pedal drive function, the proficiency level will be increased. It is possible to suppress discomfort when operating the accelerator pedal.

Further, the control unit 5 lowers the proficiency level as the number of times the brake pedal is depressed during driving using the one-pedal drive function increases. If the number of times the brake pedal is depressed is large, it means that the one-pedal drive function is not used to decelerate or stop the vehicle 1, so the more the number of times the brake pedal is depressed, the lower the proficiency level is.

As a result, the more times you press the brake pedal while driving using the one-pedal drive function, the more your proficiency level will decrease, and if it is determined that you are not using the one-pedal drive function, your proficiency level will be lowered and the one-pedal drive function will be activated. It is possible to suppress the discomfort felt by inexperienced drivers when operating the accelerator pedal.

In the present embodiment, an example has been described in which the control unit 5 performs various determinations and calculations based on various sensor information, but the present invention is not limited to this. Based on the detection information of various sensors transmitted from the communication section, various judgments and calculations are performed by the external device, the judgment results and calculation results are received by the communication section, and the received judgment results and calculation results are used. Various controls may also be performed.

Although embodiments of the invention have been disclosed, it will be apparent that modifications may be made by one skilled in the art without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

1 Vehicle 2 Drive Motor 5 Control Unit 51 Suppression Control Cancellation Switch 52 User Identification Unit 53 Accelerator Opening Sensor 54 Brake Switch

Claims (2)

A deceleration force suppressing device for a vehicle having a one-pedal drive function that can control the vehicle from acceleration/deceleration to stopping according to the operation state of one pedal,
a control unit that calculates a proficiency level of the driver of the vehicle with the one-pedal drive function, and reduces the amount of suppression of deceleration force by the one-pedal drive function as the proficiency level increases ;
The control unit is a deceleration force suppressing device that increases the proficiency level as the number of decelerations by operating the pedal when using the one-pedal drive function increases . The control unit increases the proficiency level as the distance traveled when using the one-pedal drive function increases, and lowers the proficiency level as the number of times the brake pedal is depressed when using the one-pedal drive function increases . Deceleration force suppression device.

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