Single Motor Mechanical Power-Split Transmission for Hybrid Racing Cars

2017 ◽  
Vol 9 (3) ◽  
Author(s):  
R. Ranjan ◽  
S. Srinath ◽  
A. Dhakar ◽  
B. Rajasai ◽  
S. Nagaraj
Keyword(s):  
Electric Motor ◽  
Hybrid Electric Vehicles ◽  
Role Reversal ◽  
Lower Efficiency ◽  
Ic Engine ◽  
Power Train ◽  
Power Split ◽  
Seamless Transition ◽  
Parallel Mode ◽  
Split System

A hybrid vehicle derives its power from two or more distinct sources such as an internal combustion (IC) engine and an electric motor. Based on the mechanical architecture, Hybrid Electric Vehicles can be divided into three categories: parallel hybrids, series hybrids, and power-split hybrids. Parallel hybrids require frequent role reversal due to restrictions on motor power, whereas series hybrids lead to lower efficiency of the whole power train. The power-split hybrids combine the advantages of these two configurations by using one IC engine and two motors. The main objective of this paper is to design a transmission system for a hybrid racing car which is powered by an IC engine and a single electric motor which are arranged so as to represent a unique power-split system. This configuration reduces the need of one motor and allows seamless transition between engine-only with regeneration mode, motor only mode and parallel mode.

A Mild Hybrid Engine-Solid Oxide Fuel Cell Vehicle Configuration Using a Continuously Variable Power-Split Transmission

2004 ◽  
Author(s):  
Miguel M. Gomez ◽  
James E. Smith
Keyword(s):  
Fuel Cell ◽  
Electric Motor ◽  
Fuel Cell Vehicle ◽  
Configuration Design ◽  
Power Capacity ◽  
Ic Engine ◽  
Power Split ◽  
Variable Power ◽  
Vehicle Configuration ◽  
Mild Hybrid

This paper focuses on a mild hybrid vehicle configuration design using a continuously variable power-split transmission (CVPST) with a solid oxide fuel cell (SOFC) as an auxiliary power unit (APU), which can provide electrical energy to an electric motor, recharge batteries and when necessary, supply energy to the vehicle’s electrical features. The advantage of this configuration design is that the IC (internal combustion) engine will use all its power capacity to only propel the vehicle and will not need to divert power for extra devices. When more power is needed, as in hills, extra load or highway acceleration pass, the electric motor can assist with an amount of power. Another advantage and interesting feature from the SOFC is that it is compatible with conventional petroleum fuels with a simple partial oxidation reforming process. It has less stringent requirements for reformate by using carbon monoxide (CO) directly as a fuel and has less sensitivity to contaminants. Mild hybrid vehicles are the probable primary candidates for near term mass market due to the low incremental costs, which is accomplished by minimizing the electrical machines and battery size. Yet, it is also considered that it improves fuel consumption and efficiency as a result of using a smaller IC engine. The mild hybrid may have the potential to provide the right cost and benefit balance in the short term, until the development of full hybrids and fuel cell vehicles can compete with standard IC engine vehicles in the market. Continuously variable transmissions (CVTs) have an infinitely variable input-output speed relationship, which allows the IC engine to operate more time in the optimum range. Continuously variable power-split transmissions were developed in order to reduce the fraction of power passing through the variator and consequently, expand its power capacity. In this paper a CVPST is used in a hybrid electric vehicle (HEV) application. This type of transmission has a planetary gear train (PGT), which can provide a branch for an electric motor that can be used in the mild hybrid electric fuel cell vehicle configuration proposed in this paper. This electric motor can either be powered by a SOFC and/or a battery.

Robust augmented H∞ shift control strategy for power-split system with a two-speed AMT gearbox of a heavy commercial vehicle

2020 ◽  
pp. 095440702097709
Author(s):  
Xiaohua Zeng ◽  
Zhenwei Wang ◽  
Dafeng Song ◽  
Dongpo Yang
Keyword(s):  
Control Strategy ◽  
Commercial Vehicle ◽  
Kinetic Equations ◽  
Substantial Improvement ◽  
Transmission System ◽  
Power Sources ◽  
Shift Control ◽  
Power Split ◽  
Heavy Commercial Vehicle ◽  
Split System

The coordination control of a transmission system has gradually attracted more attention with the development of hybrid electric vehicles. However, nonlinear coupling of multiple power sources, superposition of different dynamic characteristics in multiple components, and withdrawal and intervention for a power-split powertrain with a two-speed automated manual transmission (AMT) gearbox can cause jerk and vibration of the transmission system during the shift, which has higher requirements and challenges for the overall performance improvement of the system. This paper designs a novel, robust, augmented H∞ shift control strategy for a power-split system with a two-speed AMT gearbox of a heavy commercial vehicle and verifies the strategy’s effectiveness with simulations and experiments. First, the dynamic plant model and kinetic equations are established, and the shift is divided into five stages to clearly reveal the jerk and vibration problem. Based on augmented theory, a robust H∞ shift control strategy is proposed. Shift coordination is transformed into a speed tracking problem, and state variable and disturbance are reconstructed to obtain a new augmented system. Simulation and hardware-in-the-loop test are carried out to verify the effectiveness of the strategy, which mainly includes simulation of pneumatic actuator and H∞ control strategy. Results show that the proposed H∞ control strategy can greatly reduce the jerk of the transmission system. The jerk produced by the proposed strategy is decreased from 20.4 to 4.07 m/s3, leading to a substantial improvement of 80%. Therefore, the proposed strategy may offer a theoretical reference for the actual vehicle controller during the shift.

Minimizing Seat Track Vibration That is Caused by the Automatic Start/Stop of an Engine in a Power-Split Hybrid Electric Vehicle

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
Hsiu-Ying Hwang
Keyword(s):  
Hybrid Electric Vehicle ◽  
Internal Combustion Engines ◽  
Hybrid Electric Vehicles ◽  
Control Strategies ◽  
Effective Means ◽  
Combustion Engines ◽  
Crank Angle ◽  
Power Split ◽  
Hybrid Electric ◽  
Reaction Torque

The use of hybrid electric vehicles is an effective means of reducing pollution and improving fuel economy. Certain vehicle control strategies commonly automatically shut down or restart the internal combustion engines of hybrid vehicles to improve their fuel consumption. Such an engine autostart/stop is not engaged or controlled by the driver. Drivers often do not expect or prepare for noticeable vibrations, noise, or an unsmooth transition when the engine is autostarted/stopped. Unsmooth engine autostart/stop transitions can cause driveline vibrations, making the ride uncomfortable and the customer dissatisfied with the vehicle. This research simulates the dynamic behaviors associated with the neutral starting and stopping of a power-split hybrid vehicle. The seat track vibration results of analysis and hardware tests of the baseline control strategy are correlated. Several antivibration control strategies are studied. The results reveal that pulse cancellation and the use of a damper bypass clutch can effectively reduce the fluctuation of the engine block reaction torque and the vibration of the seat track by more than 70% during the autostarting and stopping of the engine. The initial crank angle can have an effect on the seat track vibration as well.

Sign in / Sign up

Export Citation Format

Share Document