Tatsuhiko Abe

Bio: Tatsuhiko Abe is an academic researcher. The author has an hindex of 2, co-authored 4 publications receiving 9 citations.

A Contact-Point Type Start of Injection Sensor for Diesel Engines

Abstract: Capteur pour la mesure du debut de l'injection sur un moteur diesel (le deplacement de l'aiguille de l'injecteur ouvre ou ferme un circuit electrique)

Valve gear with switch

Abstract: PURPOSE:To make an electrical insulating state maintainable over a long period of time in a stable manner, by forming a thine film layer with a physical evaporation process such as an ion plating method or the like. CONSTITUTION:A surface and its vicinities of a covered layer 26 consists of zircon oxide (ZrO2), but oxygen content O inside the covered layer 26 comes to being small in proportion as its internal state approximates to the surface of a valve body 8 whereby on the surface of the valve body 8, it comes to have such a sectional structure as having zircon alone. In consequence, a degree of insulation for a portion consisting of a compound between the required metal and reactant gas is continuously high toward the wall surface side of a guide hole 7 from the surface side of the valve body 8. A metallic layer region I is coveredly attached to the metallic valve body 8 with very strong cohesion, while a region IImakes insulation and abrasion resistance between the valve body 8 and a nozzle body 6 securable, therefore these regions I and II different in characteristics are strongly connectable owing to a region III.

Electromagnetic type fuel injection valve

Abstract: Disclosed is an electromagnetic type fuel injection valve including a stator iron core, an electromagnetic coil concentric with the stator iron core, a casing formed of a magnetizable material and accommodating therein the stator iron core and the electromagnetic coil, a moving body provided at its end with a valve body, a stopper for the moving body, a valve seat opposite to the stopper with the moving body interposed therebetween and a spring engaged with an end of the moving body for biasing the same, the moving body being adapted to reciprocate between the valve seat and the stator iron core under the magnetizing force of the electromagnetic coil and the biasing force of the spring, and having an armature adapted to be absorbed by the stator iron core and a rod contiguous with the valve body, the armature and the rod being formed of the same material so as to be integral with each other, a guide portion of the rod and a portion of the moving body adapted to abut against the stopper being subjected to a hardening treatment, and the electromagnetic absorbing force of the armature being increased by reducing the leak magnetic flux leaking through the rod.

Diesel Injector Dynamic Modelling and Estimation of Injection Parameters from Impact Response Part 2: Prediction of Injection Parameters from Monitored Vibration

Abstract: Part 2 of this paper presents the experimental and analytical procedures used in the estimation of injection parameters from monitored vibration. The mechanical and flow‐induced sources of vibration in a fuel injector are detailed and the features of the resulting vibration response of the injector body are discussed. Experimental engine test and data acquisition procedures are described, and the use of an out‐of‐the‐engine test facility to confirm injection dependent vibration response is outlined. Wigner‐Ville distribution (WVD) analysis of non‐stationary vibration signals monitored on the injector body is used to locate regions of vibration in the time‐frequency plane which are responsive to injection parameters. From the data in these regions, estimates of injection timing and fuel pressure are obtained. Accurate estimation of injection parameters from externally monitored vibration is shown to pave the way for the detection and diagnosis of injection system faults. Moreover, it is demonstrated that the technique provides an alternative method for the set‐up, checking and adjustment of fuel injection timing. Table 1 caption: Test engine specification Fig. 1 caption: Injector vibration versus cylinder pressure, line pressure and needle lift Fig. 2 caption: Bench‐top test rig layout and data acquisition system Fig. 3 caption: Injector vibration and needle motion from bench‐top testing Fig. 4 caption: Engine test layout and data acquisition system Fig. 5 caption: Time‐frequency analysis of injector vibration Fig. 6 caption: Time‐frequency analysis of injector vibration at 3000 r/min Fig. 7 caption: Timing of the fuel injection process Fig. 8 caption: Comparison of needle lift and vibration derived injection timing Fig. 9 caption: Comparison between injection line pressure and injector vibration Fig. 10 caption: Relationship between injector vibrtation and line pressure

Diesel Injector Dynamic Modelling and Estimation of Injection Parameters from Impact Response Part 1: Modelling and Analysis of Injector Impacts

Abstract: Part 1 of this paper presents the development and validation of a detailed dynamic model for the needle motion of a common hole‐type diesel fuel injector as used in a direct injection diesel engine. The injector needle motion is described as a two‐mass piece‐wise linear vibro‐impact system, unlike the conventional modelling techniques which use a single‐mass approach. The use of two masses permits analysis of both the needle impact behaviour and of the more general dynamics of the fuel injection process. Model parameters are derived from a combination of measurement and estimation, and the subsequent model is evaluated via direct measurement of the spring seat displacement. The opening and closing needle impact behaviour is shown to exhibit close correlation with key injection parameters, including fuel injection pressure, fuelling rate and timing. The model revealed that the impact of the needle when opening is found to exhibit lower amplitude but more high‐frequency components than the impact associated with the closing. The measurement of the injector body vibration response to these impacts is shown to enable non‐intrusive estimation of injection parameters, alleviating the problems associated with conventional intrusive needle‐lift measurement. Table 1 caption: Injector specifications Fig. 1 caption: Schematic and dynamic model of an injector valve Fig. 2 caption: Comparison between measurement and predicted needle lift Fig. 3 caption: Injection speed behaviours at a fuelling of 35 mm3/injection Fig. 4 caption: Injection fuel behaviours at a speed of setting 1.0 m/s Fig. 5 caption: Impact/speed correlation at a fuelling of 35 mm3/injection Fig. 6 caption: Time‐frequency analysis of injector impacts Fig. 7 caption: Correlation between fuel injection parameters and impacts Fig. 8 caption: Influence of needle mass on fuel injection

The Second Generation of Electronic Diesel Fuel Injection Systems-Investigation with a Rotary Pump

Abstract: This paper describes concepts of the next generation of electronic diesel fuel injection (EDFI) systems, and the test results of the prototype, named ''Model-1.'' Important characteristics of the next generation of EDFI will be; mechanical simplicity, direct control and pump intelligence. Direct spill control using a high speed solenoid valve for injection regulation and pump mounted electronic circuits were used in the ''Model-1'' system. The test results demonstrate the advantages of this system, and suggest possibilities of new function such as individual cylinder control, pilot injection and multi fuel usage.

Apparatus for sensing proximity of a moving target

Abstract: An apparatus for sensing the proximity of a moving target is provided which includes a sensor for sensing a range of distances between a reference point and a moving target. The sensor preferably has a detector for detecting a distance signal representative of a range of distances between a reference point and a moving target and a maximum and minimum generator responsive to the detector for generating a maximum distance range DC voltage signal representative of a maximum distance range value between a reference point and a moving target and for generating a minimum distance range DC voltage signal representative of a minimum distance range value between a reference point and a moving target. The sensor also preferably includes a memory device responsive to the maximum distance range signal and the minimum distance range signal for storing the maximum and minimum distance range DC voltage signals during a predetermined time period, a range value generator responsive to the memory device for generating a range value signal having an amplitude representative of a range value between the maximum distance range value and the minimum distance range value, and an output signal generator responsive to the range value signal for generating an output signal when the amplitude of the range value signal exceeds a predetermined threshold.