TWO MODE ELECTRO-MECHANICAL TRANSMISSION AND CONTROL

• US 20090209381A1
• Filed: 04/10/2007
• Published: 08/20/2009
• Est. Priority Date: 06/19/2006
• Status: Active Grant

• Current Assignee: Shandong Liancheng Greenmax Technologies Inc.
• Original Assignee: Xiaolin Ai
• Inventors: Xue, Rui, Ai, Xiaolin, Xue, Zhonghe, Ai, Xiaozhi
• Granted Patent: US 8,277,350 B2
• Time in Patent Office: Days
• US Class Current: 475/5
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• CPC Class Codes: B60K 6/26 characterised by the motors or the generators
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/40 characterised by the assembly or relative disposition of components
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60L 2240/486 Operating parameters
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/115 with planetary gears
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/20 Control strategies involving selection of hybrid configuration, e.g. selection between series or parallel configuration
• CPC Class Codes: B60W 2050/0012 Feedforward or open loop systems
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/1005 Transmission ratio engaged
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 2710/0644 Engine speed
• CPC Class Codes: B60W 2710/0666 : Engine torque
• CPC Class Codes: B60W 2710/083 : Torque
• CPC Class Codes: B60W 2710/105 : Output torque
• CPC Class Codes: F16H 2037/0866 : Power split variators with distributing differentials, with the output of the CVT connected or connectable to the output shaft
• CPC Class Codes: F16H 2037/103 : Power split variators with each end of the CVT connected or connectable to a Ravigneaux set
• CPC Class Codes: F16H 2037/106 : with switching means to provide two variator modes or ranges
• CPC Class Codes: F16H 2200/2023 : using a Ravigneaux set with 4 connections
• CPC Class Codes: F16H 3/728 : with means to change ratio in the mechanical gearing
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility

Abstract

A two mode power-split electric hybrid system and a method of control said hybrid system. The hybrid system is comprised of an engine, a transmission, an energy storage device and a control system for effecting said control method. Said transmission is a reconfigurable power split system, comprising a power-splitting device and an output power path selecting device. The power splitting device includes a compound planetary gear system and two electric machines which form a local series electric hybrid system. Said transmission regulates the output power state of said hybrid system by controlling power flow within said local series hybrid system. The hybrid system provides at least two operating mode, an output power split mode and a compound power split mode. Said control system includes multiple controllers and control modules. In accordance with the operating conditions of the hybrid system, said control system computes and sets system power requirement, allocates ob board power resources and sets engine operating speed and torque. In addition, said control system sets the operation mode of the transmission and controls the engine speed by adjusting operating torque of electric machines, based on the differential signal between reference engine speed and actual engine speed. Said control system is also capable of controlling engine torque through engine controller.

Claims

1-19. -19. (canceled)

20. A hybrid system for regulating the delivery of power to a drive shaft and providing at least two power-split modes, said hybrid system comprising:

an engine;

a transmission; and

a hybrid control system capable of computing and setting power requirement for said hybrid system, allocating power resources for said hybrid system and setting engine operating power state;

said transmission comprising;

a power splitting device; and

an output power path selecting device capable of providing at least two speed ratios;

said power splitting device having;

an input shaft operatively coupled with said engine;

a compound planetary gear system whose kinematic characteristics is uniquely defined by two characteristic parameters;

said compound planetary gear system being comprised of

a first planetary gear set having multiple co-axial rotatable members;

a second planetary gear set having multiple co-axial rotatable members;

said first and second planetary gear sets sharing a common member;

said output power path selecting device including;

an output shaft operatively coupled with drive shaft;

a first pair of constant meshing gears having a first drive gear and a first driven gear, the teeth ratio of the first drive and driven gears defining the first speed ratio;

a second pair of constant meshing gears having a second drive gear and a second driven gear, the teeth ratio of said second dive and driven gears defining the second speed ratio;

a first clutch;

a second clutch;

the ratio of said two speed ratios being a function of said characteristic parameters of said compound planetary gear system.

31. A method for controlling operation of a hybrid system;

said hybrid system including a power system controller, a battery system, an engine, a transmission having a power splitting device, an output power path selecting device and two electric machines;

said power splitting device further comprising an input shaft, a first planetary gear set and a second planetary gear set;

said first and second planetary gear sets sharing a common member and forming a compound planetary gear system;

said output power path selecting device having an output shaft, two pairs of constant meshing gears and at least one clutch;

the output power path selecting device is configured to effect two speed ratios;

said method comprising;

a step and means for receiving and processing input data and information, including vehicle speed, and acceleration pedal position;

a step and means for determining drive torque and total system power;

a step and means for allocating available power resources of said hybrid system and for setting engine output power sate, transmission operating mode and transmission operating parameters;

a step and means for determining electric machine torque commands;

said means including use of different equations for torque calculations based on operating modes;

a step and means for controlling engine speed and operating torque of both the first and second electric machines.