JP-2026074492-A - Vehicle warning devices

Abstract

[Challenge] To suppress the driver's dulling of their accelerator response. [Solution] A vehicle warning device that is installed on a vehicle capable of driving while limiting the vehicle speed to an upper limit, and which issues a warning, changes the degree of the warning according to the excess torque obtained by subtracting the upper limit driving torque when the vehicle is driven at the upper limit speed from the driving request torque based on the accelerator opening. As a result, it is possible to suppress the driver's dulling of accelerator sensitivity. [Selection Diagram] Figure 2

Inventors

• 荒川 諒太

Assignees

• トヨタ自動車株式会社

Dates

Publication Date

20260507

Application Date

20241021

Claims (1)

1. A vehicle warning device that is installed on a vehicle capable of driving while limiting the vehicle speed to an upper speed limit, and which issues a warning, A vehicle warning device that, when the vehicle speed is limited to the upper limit vehicle speed, changes the degree of the warning according to the excess torque obtained by subtracting the upper limit driving torque when the vehicle is driven at the upper limit vehicle speed from the driving request torque based on the accelerator opening.

Description

This disclosure relates to a vehicle warning system. Conventionally, warning devices for this type of vehicle have been proposed that are installed in vehicles capable of traveling at speeds below the upper speed limit based on the speed limit (see, for example, Patent Document 1). This device notifies the driver when the upper speed limit decreases due to a reduction in the speed limit. Japanese Patent Publication No. 2017-094790 This is a schematic diagram of an electric vehicle equipped with a warning device according to an embodiment of the disclosure.This flowchart shows an example of a processing routine executed by the ECU.This is an explanatory diagram illustrating an example of the relationship between the base volume, the upper volume limit, and the requested volume. Embodiments of this disclosure will be described with reference to the drawings. Figure 1 is a schematic diagram of an electric vehicle equipped with a warning device according to an embodiment of this disclosure. As shown in the figure, the electric vehicle 20 of the embodiment comprises a driving motor 32, an inverter 34, a battery 36, and an electronic control unit (hereinafter referred to as "ECU") 50. The motor 32 is configured as a three-phase AC motor and comprises a rotor with permanent magnets embedded in its rotor core and a stator with three-phase coils wound around its stator core. The rotor of the motor 32 is connected to a drive shaft 26, which is linked to the drive wheels 22a and 22b via a differential gear 24. The inverter 34 is used to drive the motor 32 and is connected to the power line 38. When a DC voltage is applied to the inverter 34, the ECU 50 controls the switching of multiple switching elements in the inverter 34, thereby forming a rotating magnetic field in the three-phase coil of the motor 32, and driving the motor 32 to rotate. The battery 36 is configured as, for example, a lithium-ion secondary battery, a nickel-metal hydride secondary battery, or a fuel cell with a rated voltage of several hundred volts, and is connected to the power line 38. The navigation device 40 comprises a main unit 42 having a storage medium such as a hard disk on which map information is stored, a CPU, ROM, RAM, input/output ports, and communication ports; a GPS antenna 44 that receives information about the vehicle's current location; and a touch panel type display 46 that displays various information such as map information, the vehicle's current location, and the planned route to the destination, and allows the user to input various instructions. Here, the map information includes service information (for example, information about facilities, parking lots, charging equipment, etc.) and road information for each predetermined driving section (for example, between traffic lights or between intersections, etc.). The road information includes distance information, width information, number of lanes information, regional information (urban areas and suburbs), type information (general roads, expressways, toll roads), gradient information, legal speed limits, number of traffic lights, and upper limit speed Vlim. The upper limit speed Vlim is the speed corresponding to the 80th percentile when the speeds of multiple vehicles traveling in the driving section are collected and arranged in ascending order. The maximum vehicle speed (Vlim) is set for each driving section and for each time of day, such as early morning, daytime, and nighttime. The navigation device 40 is connected to the ECU 50 via a communication port. When the user operates the display 46 to set a destination, the main unit 42 sets a planned driving route from the current location to the destination based on map information, the vehicle's current location, and the destination. The set planned driving route is then displayed on the display 46 to provide route guidance. The navigation device 40 exchanges various signals with the ECU 50 via communication. The ECU 50 is equipped with a microcomputer, which has a CPU, ROM, RAM, flash memory, input/output ports, and communication ports. Signals from various sensors are input to the ECU 50 via the input ports. Examples of signals input to the ECU 50 include the rotational position θm from a rotational position sensor (e.g., resolver) 32a that detects the rotational position of the rotor of the motor 32, the phase currents Iv and Iw from current sensors that detect the V-phase and W-phase currents of the motor 32, the voltage Vb from a voltage sensor attached between the terminals of the battery 36, the current Ib from a current sensor attached to the output terminal of the battery 36, the start signal from the start switch 60, the shift position SP from a shift sensor 62 that detects the operating position of the shift lever 61, the accelerator opening Acc from an accelerator sensor 64 that detects the amount of depression of the accelerator pedal 63, the brake pedal position from a brake sensor 66 that detects the amount