JP-2026075767-A - In-vehicle control systems

Abstract

[Problem] To suppress fluctuations in the actual deceleration of a vehicle even when disturbances occur that cause fluctuations in the actual deceleration of the vehicle. [Solution] The on-board control device 1 further includes a calculation unit (S2) that calculates the required deceleration of the vehicle, a deceleration execution unit (S4) that decelerates the vehicle based on the required deceleration calculated by the calculation unit S3, a determination unit (S5) that determines whether or not a disturbance has occurred in the vehicle that causes the actual deceleration of the vehicle to fluctuate due to internal factors including a change in gear or external factors including going over a step, and gradient limiting units (S6, S7) that prohibit the calculation unit (S2) from reducing the required deceleration if the determination unit (S5) makes an affirmative determination. [Selection Diagram] Figure 2

Inventors

• 遠藤 浩太

Assignees

• トヨタ自動車株式会社

Dates

Publication Date

20260511

Application Date

20241023

Claims (1)

1. An on-board control device comprising: a calculation unit that calculates the required deceleration of a vehicle; and a deceleration execution unit that decelerates the vehicle based on the required deceleration calculated by the calculation unit, A determination unit that determines whether or not a disturbance has occurred in the vehicle that causes the actual deceleration of the vehicle to fluctuate due to internal factors including a change in gear shift or external factors including going over a bump, An on-board control device further comprising a gradient limiting unit that prohibits the reduction of the required deceleration by the calculation unit when the determination unit makes a positive determination.

Description

This invention relates to an in-vehicle control device. For example, Patent Document 1 describes a driver assistance device that provides deceleration assistance for a vehicle when the relative situation between the vehicle and a vehicle ahead of it satisfies pre-set deceleration assistance conditions, and the driver of the vehicle is not performing accelerator or brake operations. The device automatically reduces the vehicle's speed when the deceleration assistance conditions are met relative to the preceding vehicle. Japanese Patent Publication No. 2022-028418 (Japanese Patent No. 7302545) This figure shows a schematic configuration of one embodiment of the in-vehicle control device according to the present invention.This is a flowchart used to explain the operation of an in-vehicle control system.(a) is a diagram showing a timing chart to explain the relationship between shift changes, required deceleration, and actual deceleration; (b) is a diagram showing a timing chart to explain the relationship between vehicle pitch, required deceleration, and actual deceleration; and (c) is a diagram showing a timing chart to explain the relationship between shift changes, required deceleration, and actual deceleration. The best embodiment for carrying out the present invention will be described in detail below with reference to the accompanying drawings. Figures 1 to 3 show one embodiment of the present invention. The in-vehicle control device 1 illustrated in this embodiment consists of an ECU (Electronic Control Unit). Although not shown in detail, this ECU includes a CPU, ROM, RAM (also called memory), communication interface, and input/output interface, all connected to each other via a bus for communication. This on-board control device 1 is connected to at least an external information input unit 2, a vehicle information input unit 3, and the like. The vehicle on which this on-board control device 1 is installed, although not shown in the diagram, is configured to include elements that enable vehicle speed reduction (such as engine braking and brake actuators). The external information input unit 2 acquires external information, such as information on whether there are vehicles, motorcycles, bicycles, etc., ahead of the vehicle that require deceleration, information on the white lines of the lane in which the vehicle is traveling, and information on the relative positional relationship between the white lines and the vehicle, and inputs this information to the on-board control device 1. This external information input unit 2 is, for example, at least one of a camera for capturing an image of the area in front of the vehicle, or a sensor for detecting the presence or absence of an object in front of the vehicle, and inputs the captured image information or detected information to the on-board control device 1. The vehicle information input unit 3 is a sensor that acquires vehicle information, specifically information on the operation of the accelerator pedal (not shown) and brake pedal (not shown), steering information, and shift (gear) change information, and inputs the acquired information to the on-board control device 1. Furthermore, the in-vehicle control device 1 of this embodiment performs at least the following: a process of calculating the required deceleration of the vehicle (not shown) and decelerating the vehicle based on the calculated required deceleration; and a process of prohibiting the reduction of the required deceleration by the calculation unit when a disturbance occurs in the vehicle that causes the actual deceleration of the vehicle to fluctuate due to internal factors such as gear changes or external factors such as going over a bump. The aforementioned disturbance refers to phenomena such as "a phenomenon in which the actual deceleration of a vehicle fluctuates due to internal factors including gear changes or external factors including crossing bumps." Specifically, the operation of the in-vehicle control device 1 will be explained with reference to the flowchart shown in Figure 2. First, in step S1, it is determined whether deceleration assistance is necessary based on the information input from the external information input unit 2 and the vehicle information input unit 3. Specifically, in step S1, the system checks whether deceleration is necessary in relation to objects recognized in front of the vehicle (such as a preceding vehicle, motorcycle, bicycle, traffic light, or curve), such as when the vehicle approaches a preceding vehicle, enters a curve at high speed, or approaches an intersection at high speed. In step S1, if the result is negative, step S1 is repeated; if the result is positive, the process proceeds to step S2. In step S2, the required deceleration is calculated based on the information obtained in step S1, and then the process proceeds to step S3. In step S3, for example, the driver determines whether the accelerator pedal (not shown) and brake pedal (not shown)