JP-7856508-B2 - Vehicle control system

JP7856508B2JP 7856508 B2JP7856508 B2JP 7856508B2JP-7856508-B2

Inventors

塚本典弘
竹市章
仲西直器
仲条誠人

Assignees

トヨタ自動車株式会社
株式会社アイシン

Dates

Publication Date: 20260511
Application Date: 20220629

Claims (3)

A vehicle control device comprising an engine, an electric motor, a first clutch for connecting and disconnecting a power transmission path between the engine and the electric motor, a second clutch capable of mechanically connecting the engine and the electric motor to the drive wheels, and a gear mechanism provided between the second clutch and the drive wheels, wherein the first clutch is released and the second clutch is engaged using a dynamic second clutch command torque which has been annealed to reduce the longitudinal acceleration of the vehicle, and the vehicle is driven solely by the electric motor, the vehicle control device controls the rotational speed of the electric motor to maintain the differential rotation of the second clutch when starting the engine by controlling the first clutch toward engagement, thereby causing the second clutch to slip. The second clutch has torque characteristics that form a play-reducing region for eliminating play in the gear mechanism, If acceleration is performed while the motor is running, the rotational speed control of the motor is activated after the command input torque to the motor has passed through the backlash reduction region . A vehicle control device characterized in that the rotational speed control of the electric motor is performed on the condition that the dynamic second clutch command torque exceeds the actual transmission torque obtained from the engagement hydraulic pressure of the second clutch plus a negative margin value .
The control device for a vehicle according to claim 1, characterized in that the rotational speed control of the electric motor is delayed when the static command second clutch input torque, which corresponds to the command input torque of the electric motor calculated based on the accelerator opening, is outside the play-reducing region, and the dynamic command second clutch input torque, which is obtained by annealing the static command second clutch input torque to mitigate the acceleration of the vehicle, is within the play-reducing region.
The control device for a vehicle according to claim 1, characterized in that when the dynamic command second clutch input torque moves out of the play-reducing region, the rotational speed control of the electric motor is initiated.

Description

This invention relates to a vehicle control device that suppresses the shock caused by the tightening of gear mechanism play when starting the engine during re-acceleration operation while the electric motor is running under light load. A vehicle control device is known that comprises an engine, an electric motor, a first clutch for connecting and disconnecting the power transmission path between the engine and the electric motor, a second clutch capable of mechanically connecting the engine and the electric motor to the drive wheels, and a gear mechanism provided between the second clutch and the drive wheels. When the engine is started by controlling the first clutch toward engagement during electric-powered driving, where the vehicle is driven solely by the electric motor with the first clutch disengaged and the second clutch engaged, the second clutch is slipped by controlling the rotational speed of the electric motor. For example, the drive system for a hybrid vehicle described in Patent Document 1 is such a device. In a vehicle configured as described above, when starting the engine while the electric motor is running, the engagement hydraulic pressure of the second clutch is first reduced. Once the torque of the second clutch decreases to near the input torque determined by the required drive torque, the output of the electric motor is increased to maintain the differential rotation of the second clutch through rotational speed control. This allows the input rotational speed of the second clutch to increase to a predetermined value while simultaneously causing the second clutch to slip. In such a vehicle, the first clutch is slipped to increase the engine speed for starting the engine. While the vehicle is driven by the electric motor via the slipped second clutch, the input rotational speed of the second clutch is increased to a predetermined value through rotational speed control of the electric motor to maintain the differential rotation of the second clutch. Therefore, the effect of the vehicle drive torque being drawn in when increasing the engine speed via the first clutch is suppressed. Patent No. 5884894 This diagram illustrates the schematic configuration of a vehicle to which the present invention is applied, as well as the main parts of the control functions and control systems for various control functions in the vehicle.This diagram illustrates the play in the gear mechanism in the power transmission path from the starting clutch to the drive wheels of the vehicle shown in Figure 1.Figure 2 shows the torque characteristics of the starting clutch, illustrating the rise in the transmitted torque of the starting clutch.This is a flowchart illustrating the key aspects of the control operation of an electronic control unit.This is a time chart explaining the key parts of the control operation of an electronic control unit. The embodiments of the present invention will be described in detail below with reference to the drawings.