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)

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

/pdf/diesel-injector-dynamic-modelling-and-estimation-of-4pgo093eh4.pdf

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

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

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

/pdf/diesel-injector-dynamic-modelling-and-estimation-of-1eq3ci0mk0.pdf

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

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.

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

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.

Apparatus for sensing proximity of a moving target

A New Electronically Controlled Injection Pump for Diesels

The diesel engine with an electronic control system which has been used in production passenger cars in Isuzu shows great advantages such as fuel economy, idle noise, cold startability and output performance by the help of the new commet V combustion chamber design. The new combustion chamber which differs in shape and throat area from the conventional commet V has been developed to be well matched to the electronic control system. The passenger car equipped with the electronic control diesel engine mentioned above provides the following four additional advantages: (1) Good acceleration response; (2) Idle speed control which is affected by engine coolant temperature, on-off of the air conditioning compressor and battery voltage; (3) Cruise control; and (4) Self-diagnostic system.

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

Citations

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

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

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

Apparatus for sensing proximity of a moving target

References

A New Electronically Controlled Injection Pump for Diesels

The Performance Advantages of Electronic Control Diesel Engine for Passenger Cars