Idle Speed Control System Research Articles

Idle speed control with low-complexity offset-free explicit model predictive control in presence of system delay

The requirement for continual improvement of idle speed control (ISC) performance is increasing due to the stringent regulation on emission and fuel economy these days. In this regard, a low-complexity offset-free explicit model predictive control with constraint horizon is designed to regulate the idle speed under unmeasured disturbance in presence of system delay with rigorous formulation. Particularly, we developed a high-fidelity 4-stroke gasoline-direct injected spark-ignited engine model based on first-principles and test vehicle driving data, and designed a model predictive ISC system. To handle the delay from intake to torque production, we constructed a control-oriented model with delay augmentation. To reject the influence of torque loss, we implemented the offset-free MPC scheme with disturbance model and estimator. Moreover, to deal with the limited capacity assigned for the controller in the engine control unit and the short sampling interval of the engine system, we formulated a low-complexity multiparametric quadratic program with constraint horizon in presence of system delay in state and input variables, and obtained an explicit solution map. To demonstrate the performance of the designed controller, a series of closed-loop simulations were performed. The developed explicit controller showed proper ISC performance in presence of torque loss and system delay.

Research on Aging of the LNG Powered Ship Based on Computer Technology and Influence on Engine Performance

The ship’s LNG power system is a key part to ensure the normal operation of the ship. Every key part of the ship will be commanded by the LNG power system. In the part that this article focuses on, the main components of the marine engine LNG power technology are the LNG power ignition system, electronic fuel injection system and idle speed control system. The working principle of marine engine LNG power technology first controls the commands issued by the control system through internal sensors, converts the commands into electrical signals through the command input device and transmits them to various electronic control units. Then the control unit processes the signals and finally the actuator Turn each command from the LNG power unit into a specific control operation for the ship. LNG power technology has a huge impact on the entire shipbuilding industry, improving the performance and kinetic energy of ship engines, reducing ship energy consumption, reducing exhaust gas emissions and reducing pollution. This article studies them.

Novel Automatic Idle Speed Control System with Hydraulic Accumulator and Control Strategy for Construction Machinery

To reduce the energy consumption and emissions of the hydraulic excavator, a two-level idle speed control system with a hydraulic accumulator for the construction machinery is proposed to reduce the energy consumption and improve the control performance of the actuator when the idle mode is cancelled. The structure and working principle are analyzed. The hydraulic accumulator (HA) is used to store the energy, which can provide backup pressured fluid when the idle mode is cancelled. Then, a method of how to set the pressure differential between the hydraulic accumulator and the load is proposed and the control law is discussed. The test rig is built. The experimental result shows that the idle speed can be switched among the first idle speed, the second idle speed and the normal speed automatically. Though the idle speed in the novel system can be reduced more than that in the conventional automatic idle speed control system (AISCS), the proposed system can still build the actuator pressure more quickly when the idle mode is cancelled. When compared to the system without the idle speed control, the energy saving of the proposed system is about 67%. The proposed two-level idle speed control system with a HA can achieve a high energy efficiency and a good control performance.

Performance analysis of an automatic idle speed control system with a hydraulic accumulator for pure electric construction machinery

Abstract To reduce the energy consumption and emissions of a hydraulic excavator (HE), an electric motor (EM) is employed to replace the internal combustion engine (ICE) that powers the hydraulic pumps. Owing to the excellent control characteristics and high efficiency of the EM, a two-level idle speed control system with a hydraulic accumulator (HA) for a HE is proposed to reduce energy consumption and improve the control performance of the actuator when the idle speed control (ISC) is switched off. A mathematical model is established and key parameters are analyzed and optimized. A simulation is performed using AMESim, and a control strategy for the two-level idle speed control is developed by using a co-simulation between AMESim and Simulink. A test rig is built based on the optimized parameters and simulation results. Experimental results show that the EM speed can be automatically switched between the first idle speed, second idle speed, and normal operating speed. Although the idle speed of the EM in the novel ISC system can be reduced more than that in a conventional ISC system, the proposed ISC system can still build actuator pressure more quickly in a working mode when the ISC is switched off. Compared to a system without idle speed control, the energy saving of the proposed system is approximately 36.06%. The proposed two-level idle speed control system with a HA can achieve high energy efficiency and excellent control performance, and it can be also applied to engine-driven construction machinery.

Comparison of Model-based Vs. Data-driven Methods for Fault Detection and Isolation in Engine Idle Speed Control System

An internal combustion engine operating at idle is regulated by a feedback controller so that it runs at a preset idle speed without stalling when no acceleration is requested from the driver. Idle speed control is affected by numerous disturbances, ranging from accessory loads to environmental conditions. Because of the regulating behavior of the controller, faults, especially actuator faults, may affect sensor measurements in a way very similar to disturbances, system uncertainty or noise. This poses a challenge to the fault detection and isolation (FDI) problem for this system. In this paper, two fundamentally different fault diagnoses approaches are used to detect and isolate faults. A model-based residual generation scheme as well as a data-driven linear discriminant analysis scheme is developed to solve the FDI problem even when faults are concurring in addition to system uncertainty, disturbance and noise. Their performances are compared side by side using data gathered from an experimentally validated simulator for an engine idle system that considers an actuator fault, a sensor fault, several system uncertainties and disturbance (operating conditions), and sensor noise. The results show that comparable performance can be achieved with both schemes and some comments are made about each approach.

Design of Engine Idle Speed Control System Based on CAN Bus

In order to reduce the fuel consumption and emissions of automobile, the engine idle speed control method was studied. The basic concept of engine idle speed and the requirements and strategies of idle speed control were introduced, and the features and structures of CAN bus technology were analyzed. An idle speed control system of automobile engine based on CAN bus was designed which included main control module, front control module and rear control module. The overall structure, hardware design and software implementation of the system were given. The system can realize the desired functions, and it has certain application value.

Idle Speed Control for GDI Engines with Interval Time-Delay

The gasoline direct injection (GDI) engine is a highly non-linear and a delayed system. The engine modle with time-delays is derived. The delays consist of an intake to torque production state delay and a network -induced interval delay. Base on the Liapunov-Krasovskii function, the criterion of interval delay control system is proposed, which ensure the idle speed control system is stability as well as robust. The simulation results show that the H∞ control has good robustness,which improves the stability of the idle speed of the GDI engine.

LPG 자동차 엔진의 솔레노이드밸브, 릴레이, 공회전조절장치의 고장사례 연구

이 논문의 목적은 LPG 자동차의 전자제어에 대한 요소의 하나인 액추에이터에 대한 고장사례를 찾아 분석하고 연구하는 것이다. 차량의 연료를 저장하는 봄 내부의 LPG 긴급 차단 솔레노이드 밸브의 필터가 막혀 연료의 공급이 간헐적으로 차단되는 현상이 발생되어 엔진이 작동하는 동안 엔진의 초기시동불량이나 가속이 되지 않는 것을 확인하였다. 엔진 컨트럴 릴레이 부위의 접점부가 가공불량이나 조립불량에 의해 완전한 면접촉이 되지않아 접촉저항이 발생되어 초기 시동을 걸었을 때 시동이 걸렸으나 재시동을 걸 때 시동이 걸리지 않는 현상을 확인하였다. 공회전 조절장치의 내부에 카본이 퇴적되어 액추에이터가 고착되어 흡입공기의 공급이 감소되어 자동차의 시동이 걸려 공회전 상태일 때 엔진의 회전수가 규정 범위를 벗어나 상승과 하락을 반복하는 불안정 상태를 확인하였다. The purpose of this paper analyzes and studies to seek the failure examples of electronic control actuators for engine in liquified petroleum gas vehicle. The first, it was verified phenomenon for intial starting damage and no-acceleration of engine because of occasionally fuel feeding interception by clogged of emergency cutting solenoid valve filter. The second, the contact resistance produced in the connecting part of engine control relay because of no fully surface contacting by processes and assembly badness. It was displayed phenomenon of re-starting badness. The actuator that idle speed control system was sticked inside because of intake-air decreasing by carbon deposit. As a result, it was verified the phenomenon of disharmony that repeated up and down the engine revolution.

Adaptive Kalman Filter-Based Load Torque Compensator for Improved SI Engine Idle Speed Control

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> This paper presents design of an SI engine load torque estimator based on an adaptive Kalman filter. The adaptive estimator is characterized by a fast response and good noise suppression ability. The estimator is used to establish a fast load torque compensation path within a proportiona-plus-integral (PI) controller-based idle speed control system. The proposed adaptive controller has been verified by means of experiments, and compared with PI, PID and polynomial controllers. The experimental results point out to favorable performance of the adaptive controller for a wide engine operating range. </para>

Crank-angle Domain Modeling and Optimal Tracking Control for Automotive Engine Idle Speed

In this paper, a nonlinear model has been developed for the Idle Speed Control (ISC) system of a 2.4-litre. 4-cylinder DaimlerChrysler car engine based on experiment data and system identification techniques. TIle model developed is relatively simple. An optimal idle speed controller has been designed and implemented into the engine. Simulation and experimental results show that the optimal ISC system is effective in both tracking and regular ing the desired idle speed and rejecting the disturbances.

Idle speed control of a direct injection spark ignition stratified charge engine

AbstractIdle speed control is investigated for a direct injection, spark ignition, stratified charge (DISC) engine equipped with an electronic throttle. Such engines can be operated in multiple combustion modes. When operating in stratified charge combustion mode, they are very different from conventional stoichiometric engines, creating new opportunities for improved speed control. With current after‐treatment technology, simultaneous high fuel economy and emissions conversion efficiency cannot be achieved by operating the engine in a steady‐state manner: it must be cycled between running ultra‐lean (for fuel economy) and rich (to service the after‐treatment system). An idle speed control system is designed to meet the considerable feedback control demands required by these new engines. Copyright © 2001 John Wiley &amp; Sons, Ltd.

High Performance Idle Speed Control Applying the Sliding Mode Control.

The idle speed reduction is one of the important solutions for fuel economy improvement. And to achieve it, it is required to improve the performance of idle speed control to prevent from engine stall. In the mass production engines, PID is mainly used for the idle speed control because of easiness of design. Recently there are many studies applying the linear control theory like LQG and H infinity to improve the performance. However there are few studies applying the nonlinear control theory in spite of the idle speed control system has non linearity like torque and friction characteristic. So we have pursued to develop the algorithm the performance of which is superior to PID and LQG by applying the sliding mode control (SMC) representative in the nonlinear control theory. In this study, at first we built the low order model of the system by using the design specifications and simple experimental results, and then we designed three controllers applying PID, LQG and SMC. And consequently we could achieve the above aim by adopting the acceleration reaching law to nonlinear input in SMC instead of the conventional constant reaching law.

High Performance Idle Speed Control Applying the Sliding Mode Control with H.INF. Robust Hyper Plane.

The idle speed reduction is one of the important solutions for fuel economy improvement. And to achieve it, it is required to improve the performance of idle speed control to prevent from engine stall. We consider that the sliding mode control (SMC) representative in the nonlinear control theory is suitable for the idle speed control system. Because this system has non linearity like torque and friction characteristics. However it was said that it was difficult to get the high performance by SMC because of the chattering problem. In the previous paper, we described the following issues. The chattering problem comes from the large switching gain to attenuate the disturbance that does not satisfy the matching condition. However we could reduce the chattering of output (engine speed) by applying the acceleration reaching law and we could get the high performance superior to PID and LQG. In this paper, we describe the more effective way to reduce the chattering. That is, we applied the robust hyper plane that is frequencyshaped by H infinity control. And then we could succeed in reducing not only the chattering of output (engine speed) but also the chattering of control input while keeping the high performance.