US 11,027,721 B2Granted

Drive force control system for vehicle

AssigneeToyota Jidosha Kabushiki Kaisha

InventorsTatsuya Imamura, Hideaki Komada, Akiko Nishimine, Yosuke Suzuki, Hidekazu Nagai, Takahito Endo, Hirotsugu Yoshino, Kensei Hata, Hiroki Yasui

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Abstract

A control system for a vehicle that prevents an unintentional mode change when a command signal cannot be transmitted to an engagement device. In the vehicle, HV-Lo mode is established by connecting a carrier to a carrier by a first clutch while disconnecting the carrier from a ring gear by a second clutch, and HV-Lo mode is established by disconnecting the carrier from the carrier by the first clutch while connecting the carrier to the ring gear by the second clutch. A normally stay clutch is used as at least one of the first clutch and the second clutch.

A drive force control system for a vehicle, comprising:

an engine;
a rotary machine;
and
a differential mechanism that is configured to perform a differential rotation among a first rotary member connected to the engine, a second rotary member connected the rotary machine, and a third rotary member connected to an output member, the differential mechanism comprises a plurality of rotary elements;
a first engagement device that connects a first rotary element and a second rotary element;
a second engagement device that connects a third rotary element and a fourth rotary element;
and
a controller that controls the first engagement device and the second engagement device,
wherein at least one of the first engagement device and the second engagement device is a normally stay clutch, and
the normally stay clutch is configured to be engaged upon reception of an engagement command signal and disengaged upon reception of a disengagement command signal, and to maintain a current engagement state when a signal transmission to the normally stay clutch is stopped,
wherein the differential mechanism is configured to operate in:
a first operating mode in which a torque of the engine is delivered to the output member with a first predetermined ratio by engaging any one of the first engagement device and the second engagement device;
and
a second operating mode in which the torque of the engine is delivered to the output member with a second predetermined ratio that is smaller than the first predetermined ratio by engaging other one of the first engagement device and the second engagement device,
wherein the engine is on during the first operating mode and the second operating mode, and
wherein the controller is configured to:
determine an engagement device in which a failure occurs out of the first engagement device and the second engagement device;
determine the engagement device in which the failure occurs is engaged or disengaged;
disengage an engagement device working properly if the engagement device in which the failure occurs is engaged;
and
engage the engagement device working properly if the engagement device in which the failure occurs is disengaged.

18 more elements

Facts

Application

16/185,883Filed 9 Nov 2018

Priority

JP JP2017-21861213 Nov 2017

Published

US 2019/0143962 A116 May 2019

Granted

8 Jun 2021

Term ends

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Classification26 codes

B60W 20/50
Control systems specially adapted for hybrid vehicles: control strategies for responding to system failures, e.g. for fault diagnosis, failsafe…
B60K 6/365
Characterised by the transmission gearings: with the gears having orbital motion
B60K 6/387
Characterised by the driveline clutches: actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means
B60K 6/40
Characterised by apparatus, components or means specially adapted for HEVs: characterised by the assembly or relative disposition of components

Abstract

Claims9