FR2823534A1 - Method for increasing the power and couple of a common rail diesel engine, utilizes an electronic circuit that has a resistance to lower the high pressure sensor signal as seen by the engine calculator - Google Patents

Abstract

An electronic circuit interposes a resistance between the common rail high pressure sensor and the engine calculator below a preset pressure threshold such that the calculator sees an apparently lower than actual pressure and increases the valve opening time. The electronic circuit is housed in a watertight box (2) which has flexible and watertight connections (3,4,5,6) to the pressure sensor and the calculator. An Independent claim is also included for: The electronic circuit, the circuit housing and electrical connection conduits.

Description

nnular section.

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  Method for increasing the power and the torque of a diesel engine with an ignition system and device for carrying out the method The invention relates to a device for increasing the power

  and the torque of a common rail type diesel engine.

  In a diesel engine, to ensure proper preparation of the fuel-air mixture, the fuel must be injected into the

  combustion at a pressure generally between 350 and 2000 bars.

  The injection system for diesel engines comprises a low pressure part (fuel tank, fuel filter, mechanical or electrical supply pump with relief valve), and a high pressure part comprising: - a high pressure pump; - discharge valves; - the discharge piping;

  - the injector / injector holder assemblies.

  High pressure diesel injection systems are so far

  large different types, which can be classified into two groups.

  A first group, in which the required injection pressure is always produced at the time of injection, this first group comprising the following systems: - in-line injection pumps, or injection group, used mainly for commercial vehicles ; - distributor injection pumps, used in the vast majority of direct-injection diesel passenger cars and light commercial vehicles, as well as for fast-rotating diesel engines; - single-cylinder injection pumps, called plug-in pumps, for marine or construction machinery; - unit injector systems, in which the injection pump and the injector form only one element mounted in the cylinder head;

  - high pressure unit pumps.

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  A second group, in which the preson dnjeion e gAndrde regardless of the gime e1 of charge: it is sy & me dnJeuion

common rah accumulator ".

  In the common millet, a storage volume forming a preion aumulaDon (the millet is fed K by a pawn pump

  in years if it was linked by a didb pump

  Radial pins (in the case of palcuDAre0 cars.

  The preson in the modulAe raU is kept constant by a preson regulator placed on the pump or on the raU, the vehicles

  U1Uitaries, on the other hand, having a flow-mAgular rAgulatlon.

  The high preson gAndrde by the pump modulated by the regulator

  e sent to the rail, then from the rally to conventional lnjeurs.

  Cinjeion proper called e initAe by the Aleronic calculator that 1mnsm at the right moment an impuRion of gen [nne of the injector. The common rail allows a hydraulic and time decoupling of the generation functions from preson to dnjeulon. The preson dilnleion is in eMet gAndrde by a high pump preson sAparde which did not re in synchronism with the injunctions, so that the preson e rule Independently of the db of ion and the gime Diet the Inerers controls Alerique flxent the beginning and the flow rate for each game and the duration of their raising, the duration of the opening and

  the preson of the system determining the db dnleulon.

  The pressure sensors prevailing in the accumulator of a common diesel diesel generator are conventionally made of the steel membrane coarse with delineation by strain reliefs. The amplification, wiring and compensation products are gathered on a

AsK log in the sensor housing.

  The advantages of the common raU are1 mulples: - possibility of realizing cuddly mulples or fraulonndes;

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  - The feed pump does not require high drive torques, and is therefore less stressed than in conventional injection systems; - metric flow regulation allows a lower fuel temperature in the injection system, compared to pressure regulation; - the injection pressure is freely selected in the map, the pressure level being able to reach 1400 bars; - pilot injection and multiple injections help to reduce polluting emissions and combustion noises; - the implementation of the "common rail" does not entail any transformation of the diesel engine, the high pressure pump replaces the injection pump and the injectors are placed in the cylinder head

  like conventional injector / injector holder assemblies.

  Different designs of "common rail" injection systems can be found in the following recent documents: - patent applications in France published under the numbers 2 786 225,

2,778,699;

  - patents granted in the United States under the numbers 6 142 125,

  6,126,208, 6,050,611, 5,979,945, 5,852,977;

  - European patent applications published under the numbers 1 041 265,

0971 119.0971 115.0969195;

  - international applications this ^ --- patent published under the numbers

  01/18382, 01/11222, 01/06111, 01/00986;

  - German patent applications published under the numbers 19 859 175,

19,858,861, 19,857,971.

  The invention aims to provide a device for increasing the power and the torque of a diesel engine with a "common rail" injection system, this device being: - easy to install, both on the production line and by a non-professional individual in mechanics; J.

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  - robust and in particular not very sensitive to temperature variations and humidity; - compact and therefore easily accommodated; - cheap; adaptable to a very large number of existing vehicles; - of use compatible with the regulations in use and the standards of the automobile manufacturers; - without significant effect on the longevity of the engines on which it is mounted. To this end, the invention relates, according to a first aspect, to a method for increasing the power and the torque of a diesel engine with a common rail type injection system, this injection system comprising a sensor high pressure and a calculator, this method comprising a step of lowering the voltage from the high pressure sensor, the lowered voltage value being sent to the computer so that

  cause an increase in injection time.

  According to a particular embodiment, the lowering of the tension is carried out

  when this voltage is greater than a predetermined threshold value.

  The invention relates, according to a second aspect to a device allowing the implementation of the above method, this device comprising an electronic circuit ensuring said voltage lowering using

  minus a resistor placed in series.

  According to various embodiments, the device presented with the following characters, possibly combined: - the electronic circuit is housed in a substantially sealed box, the input ports of this circuit being connected to two connection connectors, to the pressure sensor and to the calculator respectively; - the cables connecting the connectors to the input / output ports of the electronic circuit are flexible and substantially waterproof, the circuit

  electronic being encapsulated in the box.

  s ^ s Other objectives and advantages of [inntion will become apparent during the

  following description of implementation modes, description which will be displayed

  by referring to the appended drawings, in which: - Figure 1 is a schematic view of an additional box and its connection cables; - [gure 2 e a hAma of a cae eronue logde in the

  boMier of figure 1, according to a rdaUsation mode.

  In mmon raU inion systems, as well as 0 to Atd d previously, the initiation time and fuel preson are linked by the caograph of the computer, information which is not easily accessible and modifiable. These engine preparers offer the pure and simple change of euronlque chip or the re-programming, which is expensive and complex. bier addlonnel lon Pln-on for a much simpler Beauup use. includes as eMet: - an eronic ccuR 1 log in a boMe 2 markedly Atanche; - a flexible cable 3 and substantially Atanche rebating the pos of interconnection of cae Aleuronlque two connection lugs 15, this flexible cable Having a connection for 6 enTouenY. _ The pods 15 or conneeurs are of known pe in soil and in particular ldenques or adaptable those used by the conrueur

  These lugs 4,5 are, for example, sold by the company Sicma.

  The Aleronique 2 product shown in gure 2 includes four pos

7,8,9,10.

  The first poin 7 e deinA re cone6 mae of the sensor

3Q preson of the inion syAme.

  The second po 8 corsponds to the sign of our psion.

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  The third and fourth ports correspond to the signal sent to said audit

  sensor by electronic circuit 1.

  As will be understood by a person skilled in the art, the electronic circuit 1 inserts a resistance on the input voltage of the sensor, from a triggering threshold, this threshold being predetermined by adjusting the

potentiometer 11.

  The additional unit thus sends distorted information to the computer, making it "believe" that the fuel pressure is low, the computer then increasing the injection time, to take this into account.

  apparently low injection pressure.

  When the pressure sensor is of the pizo type, the applicant has observed that the voltage delivered by this sensor is usually of the following type: - O volt: no pressure; - 1.3 volts: injection pressure of the order of 300 bars;

  - 5 volts: injection pressure of the order of 1300 bars.

  After tests, the Applicant has found that the drop in notched voltage using a resistor placed in series causes the drop in output voltage, the injection process and the fuel pressure being modified by the computer while remaining within the tolerances given by the manufacturers. The supply of circuit 1 is provided by the DC voltage and the

pressure sensor mass. - ^ -

  The intercalation of the box, which works only on the information of the high pressure sensor of the "common rail" is fast and simple, and can be

  performed by a lay person.

  Only the value of the threshold will be pre-adjusted by a professional, if necessary, to take account of the type of vehicle and the wishes of the user. The increase in power obtained using the housing as described above is of the order of 15 to 40%, the increase in torque being

around 20 to 50%.

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Claims (5)

  1. Method for increasing the power and the torque of a diesel engine with a common rail type injection system, this injection system comprising a high pressure sensor and a computer, this process being characterized in that it includes a step of lowering the voltage from the high pressure sensor, the lowered voltage value being sent to the   computer so as to cause an increase in injection time.   2. Method according to claim 1, characterized in that the lowering of the voltage is carried out when this voltage is greater than a predetermined threshold value. 3. Device allowing the implementation of the process present in   Any one of claims 1 or 2, characterized in that it comprises   an electronic circuit ensuring said voltage lowering using   minus a resistor placed in series.   4. Device according to claim 3, characterized in that the electronic circuit is housed in a substantially sealed box, the input / output ports of this circuit being connected to two connection connectors,   to the pressure sensor and to the computer respectively.   5. Device according to claim 4, characterized in that the cables connecting the connectors to the input / output ports of the electronic circuit are flexible and substantially sealed, the electronic circuit being encapsulated in