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With the increased number of electric/electronic devices introduced into vehicles, the coordination control work among various appliances is becoming more and more complicated. Consequently, the fault diagnosis of vehicular devices is also becoming more difficult. This paper proposes a fault diagnosis method based on electronic coordination mechanism. The basic design and implementation procedure...
The velocity in vehicle routing problem is usually fuzzy and uncertain, which would influence the flexibility and feasibility of the dispatch result of vehicles. In this paper a realistic model is proposed to solve urban pickup and delivery problem with consideration of time-dependent fuzzy velocity of vehicles. Firstly, based on collected traffic data of typical roads in an urban city, the membership...
The calculation of engine transient rotating speed is an important method to identify the working state of the engine and the crankshaft torsion vibration. In the actual working state, the measured engine rotating speed signals contains interference signals, which will reduce the accuracy of the calculation. A new adaptive filtering method of the engine rotating speed is proposed. A narrow band-pass...
The longitudinal profile of a road causes vehicle vibration and thus an important parameter in research on the ride comfort and durability of vehicles. However, large-scale measured profiles of actual roads remain unavailable owing to technical measurement difficulties. We report a vehicle-mounted system for measuring short-to medium-wave road profiles in a broad frequency range. In this system, the...
Despite the development of the GPS navigation system, problems still lies in two topics: GPS signal losses and unreliable positioning in the elevation direction. This paper proposes a vehicle state estimation system to produce integrate information including the slope angle, as well as continuous positioning in case GPS losses happen. The system uses low-cost inertial sensors, including an accelerometer...
Computer simulation technology is of increasing importance in the vibro-acoustic analysis and design of complex mechanical systems, such as vehicles, ships, aircraft, etc. In this paper, an acoustic topology optimization method based on coupled panel contribution analysis of cab is proposed. The finite element structure model and cavity model of a real heavy duty truck cab are built. The structural...
Present a high-speed vehicle-mounted measurement method of the road shape. The measurement system's hardware is composed of two accelerometers, a laser displacement sensor, a data acquisition device and a vehicular computer. The software algorithm in MATLAB uses the longitudinal acceleration signal which are detected by the accelerometers as the main input signal to obtain longitudinal displacement...
The sound absorption materials are more and more widely used in vehicles. An novel optimal design method is proposed in this paper, which mainly includes two steps: (i) the determination of expected absorbing curve based on noise reduction goal and noise rating curve; (ii) choice of absorption materials and optimization of the material thickness based on the sound absorption model. The method has...
For general problem of Nurbs surface-plane intersections, an analytical intersection algorithm based on matrix representations for B-Splines is presented. This analytical algorithm firstly gets a set of theoretically precise intersection points between Nurbs surface and plane, then sorts the set of points into a sequence, finally interpolates the sequence into a smooth and precise curve, with this...
In this paper, various numerical calculation methods are rigorously combined to model and analyze the acoustic characteristics of a heavy truck cab. Firstly a brief introduction of different numerical calculation methods is given, then the finite element structure model and cavity model of the cab are built. The statistical energy analysis models of the cab, including structural subsystems and cavity...
To locate the moving sound sources with microphone arrays, with the random sparse arrays we could get equal results but much less microphones than the complete arrays; then the measuring system could be inexpensive and less complicated. The traditional technique to identify sound source with random sparse array is usually based on the beamforming principle, its resolution at low frequencies is not...
A new kind of automotive electrical system is proposed, which named IEED system. It is a completely distributed system with only intelligent electrical & electronic device (IEED) in it. The systempsila features is described and key IEEDs in system are also presented. The system prototype was developed and experimented. Results showed that IEED system is feasible and cost effective.
Regenerative braking plays an important role in improving the efficiency of electric vehicles. But excessive regenerative torque may affect the anti-lock brake control. The paper presents a novel brake control strategy for electric vehicles which integrates the regenerative brake control and anti-lock brake control. The strategy is designed based on a novel idea called "slip trial method",...
Model of intersection, as a part of road network model, which is the basis of In-Vehicle Navigation System, provides an abstract description of urban traffic intersection. This paper proposes a Multi-branch model, which abstracts branch based on physical structure of intersection for describing structural features of different types of intersections. And on this basis it describes accurate navigation...
This article presents a general structure of speech control intelligent electrical system. Under specific in-vehicle environment, a classified vocabulary is designed. Driver's nature language is processed using normal-mode and infinite state machine theory to achieve the goal of speech control. Robust design is also used to increase the accuracy of driver' intension recognition result. A demo system...
The hybrid electric vehicle (HEV) discussed in this paper features its post-transmission configuration, which enables the tractive motor to drive the vehicle even in neutral gear. A generator is attached to the engine to charge the battery. Development of control system of the powertrain is reported in this paper. Control strategies based on ICE optimal operating schedule are utilized to reduce fuel...
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