Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

PD Controller: Design

PD Controller: Design

In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...

Internal Combustion Engine

Internal Combustion Engine

The internal combustion engine is a heat engine that uses the byproducts of combustion as the working fluid instead of using a heat transfer medium to transfer heat. The combustion is done in a way that produces high-pressure combustion products that can be expanded through a turbine or piston to create work. Internal combustion engines can again be categorized into three kinds: (1) spark ignition gasoline engines, most commonly used in automobiles, (2) compression ignition diesel engines that...

Turbine-Governor Control

Turbine-Governor Control

Turbine-governor control is crucial for maintaining power system stability by balancing turbine mechanical power output with electrical load demand. This mechanism ensures that generator frequency and rotor speed are within acceptable limits during load variations. Turbine-generator units store kinetic energy due to their rotating masses; this energy is released to meet the load requirement when the load increases. The electrical torque of turbines rises to meet the demand, whereas the...

PID Controller

PID Controller

Proportional-Integral-Derivative (PID) controllers are widely used in various control systems to enhance stability and performance. In a thermostat, it adjusts heating or cooling based on the temperature difference between the actual and desired levels. They are often used in automotive speed systems, effectively managing sudden speed changes while maintaining a constant speed under varying conditions. On the other hand, PI controllers, commonly employed in voltage regulation, enhance stability...

Electro-mechanical Systems

Electro-mechanical Systems

Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
A key component of the DC motor is the armature, a rotating circuit positioned within a magnetic field. As an electric current passes through the...

Root-Locus Method

Root-Locus Method

A cruise control system in a car is designed to maintain a specified speed automatically by adjusting the gas pedal. The system continuously measures the vehicle's speed and makes fine adjustments to the pedal to achieve this goal. The root locus method is particularly useful for understanding how the cruise control system's behavior changes under varying conditions, such as when the car goes uphill, downhill, or faces strong wind resistance.
This system can be represented by a block diagram,...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Cystathionine gamma-lyase deficiency and overproliferation of smooth muscle cells.

Cardiovascular research·2010

Same author

In vitro and in vivo antitumor effects of novel actinomycin D analogs with amino acid substituted in the cyclic depsipeptides.

Peptides·2010

Same author

[Detection of single-walled carbon nanotube bundles by tip-enhanced Raman spectroscopy].

Guang pu xue yu guang pu fen xi = Guang pu·2009

Same author

Calcium-sensing receptors induce apoptosis in rat cardiomyocytes via the endo(sarco)plasmic reticulum pathway during hypoxia/reoxygenation.

Basic & clinical pharmacology & toxicology·2009

Same author

Evolution of the solvent polarity in an electrospray plume.

Journal of the American Society for Mass Spectrometry·2009

Same author

[The impact of platelet membrane autoantibodies on high-dose dexamethasone therapy in patients with idiopathic thrombocytopenic purpura].

Zhonghua xue ye xue za zhi = Zhonghua xueyexue zazhi·2009

Search research articles

Related Experiment Videos

Speed-feature-based engine stop-position control for hybrid electric vehicles.

Yuzhen Yuan¹, Zhiqiang Lin², Rui Wang¹

¹National Key Laboratory of Advanced Internal Combustion Power, Tianjin University, Tianjin, 300350, China.

Scientific Reports

|June 2, 2026

Summary

This study introduces a sensor-free method for hybrid electric vehicle (HEV) engine stop-start control, improving restart smoothness and driving comfort. The innovative approach uses only speed signals, simplifying systems and reducing costs.

Keywords:

Engine stop-position control Engine stop-start HEVs NVH

Related Experiment Videos

Area of Science:

Automotive Engineering
Control Systems
Hybrid Electric Vehicles

Background:

Hybrid electric vehicles (HEVs) face challenges with noise, vibration, and harshness (NVH) due to frequent engine stop-start cycles.
Traditional engine restart control systems rely on crankshaft sensors, which are unreliable at low speeds and add complexity.

Purpose of the Study:

To develop a position-sensor-free stop-position control strategy for HEVs using only speed signals.
To enhance driving comfort by improving engine restart smoothness and reducing NVH.

Main Methods:

Leveraging the relationship between speed extrema during compression and top dead center (TDC) for real-time TDC detection and crank angle estimation.
Designing a C¹-continuous quadratic speed trajectory with feedforward torque compensation and gain-scheduled PI feedback control.

Main Results:

Achieved a positioning accuracy of 1.7 degrees.
Completely eliminated engine reversal during restarts.
Recovered 44.69 J of kinetic energy, meeting 6.25% of restart energy demand.

Conclusions:

The proposed sensor-free strategy simplifies control architecture by eliminating dedicated crankshaft sensors.
This cost-effective solution is particularly advantageous for low-cylinder-count HEVs prone to significant speed fluctuations.