A device to measure wheel slip to improve the fuel efficiency of off road vehicles

2017 ◽  
Vol 70 ◽  
pp. 1-11 ◽  
Author(s):  
A. Ashok Kumar ◽  
V.K. Tewari ◽  
Chanchal Gupta ◽  
C.M. Pareek
Keyword(s):  
Fuel Efficiency ◽  
Road Vehicles ◽  
Wheel Slip

Development of a Brake System for Lightweight Vehicle

2006 ◽  
Author(s):  
Seok Lee ◽  
Taehyun Shim ◽  
Byung-Kwan Cho
Keyword(s):  
Automotive Industry ◽  
Pulse Width Modulation ◽  
Sliding Mode ◽  
Fuel Efficiency ◽  
Solenoid Valve ◽  
Brake System ◽  
Wheel Slip ◽  
Antilock Brake System ◽  
Nonlinear Vehicle Model ◽  
Brake Performance

With a growing demand for improved fuel efficiency and reduced emissions, lightweight vehicles have gained strong attention in current automotive industry. This paper discusses the development of a brake system for a lightweight vehicle that has significant weight variations. A conventional brake system was first designed and its performance was assessed. In order to improve the brake efficiency and prevent wheel lockup under all loading cases, antilock brake system (ABS) is proposed in which a wheel slip controller based on sliding mode control and a solenoid valve actuator is modeled. In the wheel slip controller, Extended Kalman Filter (EKF) was used to monitor the brake forces and a pulse width modulation (PWM) technique was applied to control the solenoid valve. The overall brake performance was evaluated through simulation of 8 DOF nonlinear vehicle model. The proposed brake system showed significant improvement in brake efficiency.

Dynamic Brake Force Distribution for Heavy Commercial Road Vehicles Using Wheel Slip Regulation

2019 ◽  
Author(s):  
Akhil Challa ◽  
K. B. Devika ◽  
Shankar C. Subramanian ◽  
Gunasekaran Vivekanandan ◽  
Sriram Sivaram
Keyword(s):  
Sliding Mode ◽  
Traction Force ◽  
Simulation Software ◽  
Force Distribution ◽  
Vehicle Dynamic ◽  
Road Vehicles ◽  
Wheel Slip ◽  
Braking Performance ◽  
Brake Force ◽  
Brake Force Distribution

Abstract Wheel lock is an undesired phenomenon in Heavy Commercial Road Vehicles (HCRVs) and wheel slip control within a desired range is of crucial importance for stable and effective braking. This study proposes a framework to distribute brake force dynamically between the front and rear wheels, primarily to avoid instability by preventing wheel lock. Further, it ensures the maximum utilization of the available traction force at the tire-road interface that varies during the course of braking due to factors like load transfer. Wheel slip regulation provides an approach to maximize braking performance that subsumes the effects of varying road, load and braking conditions that occur during vehicle deceleration. The methodology proposed consists of a wheel slip controller that calculates the required brake force distribution parameters, which are then provided to the brake controller for control action. Sliding mode control was used because of the nonlinear nature of the longitudinal vehicle dynamic model considered and for robustness towards different parameter variations. The algorithm was implemented on a Hardware-in-Loop test setup consisting of a pneumatic air brake system, interfaced with IPG-TruckMaker® (a vehicle dynamic simulation software), and co-simulated with MATLAB-Simulink®. It was found that this algorithm improved the braking performance of a HCRV both in terms of stopping distance and vehicle stability.

A 3-phase combined wheel slip and acceleration threshold algorithm for anti-lock braking in heavy commercial road vehicles

2021 ◽  
pp. 1-22
Author(s):  
Akhil Challa ◽  
Karthik Ramakrushnan ◽  
Pavel Vijay Gaurkar ◽  
Shankar C. Subramanian ◽  
Gunasekaran Vivekanandan ◽  
...  
Keyword(s):  
Road Vehicles ◽  
Wheel Slip ◽  
Threshold Algorithm ◽  
Acceleration Threshold

scholarly journals Investigation of the Potential of Gas Turbines for Vehicular Applications

2012 ◽  
Author(s):  
Henrique E. Cunha ◽  
Konstantinos G. Kyprianidis
Keyword(s):  
Gas Turbine ◽  
Fuel Consumption ◽  
Gas Turbines ◽  
Fuel Efficiency ◽  
Pollutant Emissions ◽  
Efficiency Improvement ◽  
Prime Mover ◽  
Road Vehicles ◽  
The Past ◽  
Efficiency Gap

Nowadays, the reduction of fuel consumption and pollutant emissions has become a top priority for society and economy. In the past decades, some of the environmental advantages of the gas turbine (such as inherently low CO and unburned HC) have led some car manufacturers to evaluate the potential of this type of engine as prime mover. This paper suggests a strategy to assess the fuel consumption of gas turbines applied in road vehicles. Based on a quasistatic approach, a model was created that can simulate road vehicles powered by gas turbines, and thereafter a comparison was established with reciprocating engines. Within this study, material and turbomachinery technology developments that have taken place in micro gas turbines since the 1960’s have been considered. A 30% efficiency improvement target has been identified with respect to making the gas turbine fuel competitive to a diesel engine powering an SUV. It is the authors’ view that several technologies that could mature sufficiently within the next 10–15 years exist, such as uncooled ceramic turbines. Such technologies could help bridge the fuel efficiency gap in micro gas turbines and make them commercially competitive in the future for low-emissions vehicular applications. Furthermore, the system developed also allows the simulation of hybrid configurations using gas turbines as range extenders, a solution that some car manufacturers consider to be the most promising in the coming years.

scholarly journals Traction Control Development for Heavy-Duty Off-Road Vehicles Using Sliding Mode Control

2020 ◽  
Author(s):  
Addison Alexander ◽  
Andrea Vacca
Keyword(s):  
Sliding Mode ◽  
Heavy Duty ◽  
Nonlinear Controller ◽  
Road Vehicles ◽  
Wheel Slip ◽  
Traction Control ◽  
Mode Design ◽  
Construction Machine ◽  
Control Capability ◽  
Assistance Systems

Construction equipment represents a unique field for operator assistance systems. These machines operate in applications where safety and productivity are paramount. One mechanism of interest recently is traction control. In order to push the limits of the traction control capability, a nonlinear controller is created. To do this, a nonlinear model of a representative construction machine is developed. Based on this model, a sliding mode-type controller is generated. The controller is then run in simulation and implemented on a prototype machine. The sliding mode design shows an improvement in both wheel slip and machine pushing force over previous work.

scholarly journals Wheel Slip Regulation Of Electrified Heavy Road Vehicles Using Regenerative Braking

2020 ◽  
Vol 53 (1) ◽  
pp. 422-427
Author(s):  
Kesavan Valis Subramaniyam ◽  
Shankar C. Subramanian
Keyword(s):  
Regenerative Braking ◽  
Road Vehicles ◽  
Wheel Slip

Automatic Adaptation of Tire Pressure According to Operating Conditions

2016 ◽  
Vol 8 (2) ◽  
Author(s):  
A. Hendy ◽  
Shawky Hegazy ◽  
M.A.A. Emam ◽  
H. Hossamel-din
Keyword(s):  
Continuous Monitoring ◽  
Rolling Resistance ◽  
Considerable Effect ◽  
Operating Conditions ◽  
Inflation Pressure ◽  
Road Vehicles ◽  
Tire Pressure ◽  
Wheel Slip ◽  
Slip Ratio ◽  
Automatic Adaptation

The off-road vehicles have much higher rolling resistance due to tire sinkage. This paper presents a proposed system for automatic adaptation for tire inflation/deflation, according to operating conditions. The tire inflation pressure is manually changed by the driver to some prefixed pressure values. The proposed control system is based on calculating the instantaneous wheel slip ratio. As the slip ratio increases, the tire pressure decreases automatically to increase the contact area and to decrease the dynamic sinkage and vice versa. An algorithm for the control strategy is developed. The proposed system provides a continuous monitoring of tire pressures inside the tire and then to inflate/deflate according to terrain types. The results show that a low inflation pressure has a considerable effect on the net traction ratio where it improves the performance by 20% and the buffed tire has a better traction than lugged tire on sand.

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