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In this paper, an internal combustion engine coolant temperature model has been developed for control and diagnostics development and validation purpose. We propose an approach of using both physical laws and dynamic data to develop the dynamic model of the cooling system. The parameters of the equations for the selected components are collected from vehicle under test and from available literature. The unknown parameters are estimated using a constrained non-linear optimization formulation and dynamic data measured from the test vehicle. The results obtained by the proposed model are closely matching with the actual Engine Coolant Temperature responses for various drive cycles.

In this paper the quantitative estimation on the flexural rigidity of the structural adhesive-aided joint (adhesive joint, weldbonded joint etc.) of the single-lap form in steel is carried out, based on the experiment using three-point bending test and the calculation treating the adhesive joint as the composite beam. Relationships of the flexural rigidity of the adhesive joint with its various elements and the agreement between experimental results and calculated results are in detail discussed. Moreover, factors which govern the flexural rigidity of the weldbonded joint are made clear experimentally.

A gasoline engine with an entirely new combustion cycle deriving from Miller Cycle is developed. By delaying closing timing of intake valve and with new Lysholm Compressor which provides higher boost pressure, engine knocking is avoided while high compression ratio is maintained and approximately 1.5 times larger toque than that of a naturally aspirated(NA) engine of the same displacement is realized. This V6 Miller Cycle gasoline engine can be the alternative to a larger displacement NA engine because of its equivalent torque performance and its lower fuel consumption by the effect of smaller displacement.

Mazda has developed new-generation V6 engines. The new V6 series comprises 2.5-litre, 2.0-litre and 1.8-litre engines. The development objective was to ensure high output performance for excellent “acceleration and top-end feel”, while satisfying “Clean & Economy” requirements. The engines also had to have a pleasant sound. Mazda selected for these engines a short stroke, 60° V-shaped 24 valve DOHC with an aluminum cylinder block. Various techniques are adopted as follows: Combustion improvement and optimization of control to achieve high fuel economy and low emissions Improvement of volumetric efficiency, inertia reduction of rotating parts and optimization of control to achieve excellent “acceleration and top-end feel” Adoption of a high-rigidity, two-piece cylinder block and crankshaft and weight reduction of reciprocating parts to achieve a pleasant engine sound Material changes and elimination of dead space to achieve a compact, lightweight engine

This paper deals with a non-destructive detection method of fatigue crack in spot-welded joints under tensile-shear repeated load. We developed the non-destructive method, according to which the generation time, the crack length and the propagation speed of fatigue crack can be quantitatively estimated by utilizing information obtained from strain gages bonded on the electrode indentations of spot welds. Specimens used in this experiment are made of various kinds of thin steel sheets.

This study intends to make clear the effects of the property of base metal, specimen width, sheet thickness and nugget diameter on the initiation life of fatigue crack and the propagation life in single-spot-welded joint specimens under tensile-shear repeated load, and using these results to establish an empirical formula according to which the ΔL-N diagram can be drawn. It was confirmed that accuracy of the empirical formula is at considerable high level, when this formula is applied for data of hitherto published many reports, and the predicted results obtained by this formula are compared with these experimental results.