JPS58162742A - Fuel supply controller for multi-fuel engine - Google Patents

Fuel supply controller for multi-fuel engine

Info

Publication number
JPS58162742A
JPS58162742A JP57046110A JP4611082A JPS58162742A JP S58162742 A JPS58162742 A JP S58162742A JP 57046110 A JP57046110 A JP 57046110A JP 4611082 A JP4611082 A JP 4611082A JP S58162742 A JPS58162742 A JP S58162742A
Authority
JP
Japan
Prior art keywords
fuel
temperature
engine
fuel supply
catalytic converter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP57046110A
Other languages
Japanese (ja)
Inventor
Kaoru Uno
薫 宇野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP57046110A priority Critical patent/JPS58162742A/en
Publication of JPS58162742A publication Critical patent/JPS58162742A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M13/00—Arrangements of two or more separate carburettors; Carburettors using more than one fuel
    • F02M13/08—Carburettors adapted to use liquid and gaseous fuels, e.g. alternatively
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0602—Control of components of the fuel supply system
    • F02D19/0613—Switch-over from one fuel to another
    • F02D19/0615—Switch-over from one fuel to another being initiated by automatic means, e.g. based on engine or vehicle operating conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0626—Measuring or estimating parameters related to the fuel supply system
    • F02D19/0628—Determining the fuel pressure, temperature or flow, the fuel tank fill level or a valve position
    • F02D19/0631—Determining the fuel pressure, temperature or flow, the fuel tank fill level or a valve position by estimation, i.e. without using direct measurements of a corresponding sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0642—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0673—Valves; Pressure or flow regulators; Mixers
    • F02D19/0678—Pressure or flow regulators therefor; Fuel metering valves therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2201/00—Fuels
    • F02B2201/06—Dual fuel applications
    • F02B2201/064—Liquid and gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0802—Temperature of the exhaust gas treatment apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

PURPOSE:To prevent a catalyst from being damaged, by a method wherein the temperature of a catalytic converter provided at an exhaust part for an engine jointly using a liquid fuel and a gaseous fuel is detected, and the fuel is changed over from the liquid fuel to the gaseous fuel when the detected temperature is high. CONSTITUTION:A temperature detector 21 is provided for the catalytic converter 20 provided at the exhaust part for the engine 1 in which the gaseous fuel 4 and the liquid fuel 10 are selectively supplied into a carburetor 3 through solenoid change-over valves 14, 15. In operating with the liquid fuel, when the temperature detected by the detector 21 exceeds an allowable value, a switch 23 is closed to supply an electric current to a coil 25, whereby a contact of a relay 24 is changed over to B side, so that the valve 15 is opened, while the valve 14 is closed, and the fuel supplied to the carburetor 3 is changed over from the liquid fuel to the gaseous fuel. Accordingly, the condition in which the gaseous fuel is used with the result of a lower exhaust gas temperature is established, the temperature of the catalyst is lowered, and the catalytic converter is prevented from being damgaged due to a high temperature.

Description

【発明の詳細な説明】 本発明はガソリン−ＬＰＧ併用併用車内燃機関に適用さ
れ、排ガス浄化用触媒コンバータの過熱防止を図った燃
料併用機関の燃料供給制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel supply control device for a gasoline-LPG engine, which is applied to a gasoline-LPG internal combustion engine, and is designed to prevent overheating of an exhaust gas purifying catalytic converter.

一般に、ガソリン機関はＬＰＧ機関に比較して５〜１０
％高出力である反面、燃料コストが高（つくという特質
がある。仁の事から、従来、商用車、などの車両にガソ
リン−ＬＰＧ併用機関が使用され、負荷に応じて切り換
え使用するようにしている。すなわち、高出力の必要時
にガソリン機関を用い、平常走行時にはＬＰＧ機関とし
て使用する。Generally speaking, gasoline engines are 5 to 10 times more expensive than LPG engines.
Although it has a high output, it has the characteristic of high fuel cost.As a result, conventionally, gasoline-LPG combination engines have been used in commercial vehicles and other vehicles, and the engines have been switched depending on the load. In other words, the gasoline engine is used when high output is required, and the LPG engine is used during normal driving.

ところで、近時、公害防止の見地から、排ガス浄化装置
設置がＷまれ、その一手段として触媒コンバータを設け
たものがある。この触媒コンバータは排気管の一部に触
媒室を設げ、この部屋を通過する排ガスの酸化により浄
化作用を行なうようにしたもので、一定温度２以下、例
えば９００℃以下の範囲で使用することが望まれる。Incidentally, in recent years, from the viewpoint of pollution prevention, the installation of exhaust gas purification devices has become popular, and as one means of achieving this, some devices have installed catalytic converters. This catalytic converter has a catalyst chamber installed in a part of the exhaust pipe, and purifies the exhaust gas passing through this chamber by oxidizing it. It can be used at a constant temperature of 2 or less, for example, 900 degrees Celsius or less. is desired.

しかして、燃料併用機関において、ガソリン機関として
使用した場合は、燃料の霧化特性に基づくリッチ化によ
り、ＬＰＧ機関としての使用時に比較して排ガス温度が
異常に高くなり、これにより触媒温度を前記以上となる
事態を招き、触媒の許容使用温度を越えることがある。However, when a fuel-combined engine is used as a gasoline engine, the exhaust gas temperature becomes abnormally high compared to when used as an LPG engine due to enrichment based on the atomization characteristics of the fuel, and this causes the catalyst temperature to rise above the The above situation may occur and the allowable operating temperature of the catalyst may be exceeded.

従来ではガソリンおよびＬＰＧを単に負荷に応じた切り
換え使用しているのみである九め、ガソリン使用時に排
ガスが異常に高くなり、触媒の浄化作用を著しく悪化さ
せる虞れがあった。In the past, gasoline and LPG were simply switched and used depending on the load, but when gasoline was used, the exhaust gas became abnormally high and there was a risk that the purification effect of the catalyst would be significantly deteriorated.

本発明はこのような事情に鑑みてなされたもので、燃料
併用゛機関において、排ガス浄化用の触媒コンバータが
損傷するのを確実に防止しつつ、その併用機能を十分発
揮することができる燃料併用機関の燃料供給制御装置を
提供することを目的とする・ この目的を達成するため、本発明は、共通な機関に液体
燃料供給部と気体燃料供給部とを切換え可能に接続し、
排気部に排ガス浄化用の触媒コンバータを設けたものに
おいて、触媒コン７（−タに温度検出器を設け、この検
出器で検出した出力信号を入力として一定以上の高温検
出により燃料切換部を液体燃料供給から気体燃料供給に
切り換える制御部を設けてなる。The present invention has been made in view of the above circumstances, and is a fuel-combined engine that can reliably prevent damage to the catalytic converter for exhaust gas purification while fully demonstrating its combined function in a fuel-combined engine. An object of the present invention is to provide a fuel supply control device for an engine. In order to achieve this object, the present invention connects a liquid fuel supply section and a gaseous fuel supply section to a common engine in a switchable manner,
In the exhaust section equipped with a catalytic converter for purifying exhaust gas, a temperature detector is provided at the catalyst converter 7 (-), and the output signal detected by this detector is used as an input to turn the fuel switching section into a liquid state when a high temperature is detected above a certain level. A control section is provided for switching from fuel supply to gaseous fuel supply.

以下、本発明の一実施例を図面を参照して説明する。図
において、１は共通な機関としてのエンジン本体、２は
そのエンジン本体１のインテークマニホルド、３はキャ
ブレタである。このキャブレタ３に、ガソリン等のＰ体
熔料供給部として、燃料タンク４ｔ−燃料フィルタ５、
燃料ポンプ６を順次に介して燃料供給管９により接続し
てし・る。Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In the figure, 1 is an engine body serving as a common engine, 2 is an intake manifold of the engine body 1, and 3 is a carburetor. This carburetor 3 has a fuel tank 4t, a fuel filter 5,
A fuel supply pipe 9 is connected to the fuel pump 6 in sequence.

また、キャブレタ３には気体燃料供給部としてＬＰＧタ
ンク１０をフィルタ１１．ＬＰＧレギュレータ１２を介
して気体燃料供給管１３によって接続している。The carburetor 3 also includes an LPG tank 10 as a gaseous fuel supply section and a filter 11 . It is connected via a gaseous fuel supply pipe 13 via an LPG regulator 12 .

各燃料供給管９．１３には、燃料切換部としての電磁切
換弁１４．１５を設けて（・る。この各電磁切換弁１４
．１５は〕（ツテリ電源１６にイグニツクヨンスイッチ
１７および手動操作用溶料切換スイッチ１８を介して相
対的に開閉可能に接続され、この燃料切換スイッチ１８
の各接点Ｃ１Ｄへの切換操作により気体燃料供給と液体
燃料供給とに選択的に切り換え可能としたものである。Each fuel supply pipe 9.13 is provided with an electromagnetic switching valve 14.15 as a fuel switching section.
．． 15 is connected to a fuel power source 16 via an ignition switch 17 and a manually operated solvent changeover switch 18 so as to be relatively openable and closable.
It is possible to selectively switch between gaseous fuel supply and liquid fuel supply by switching to each contact C1D.

このものにおいて、エンジン本体１の排気管１９に設け
た触媒コン７（−夕２０に温度検出器２１を設け、この
温度検出器２１を制御部２２に接続し、温度検出器２１
で検出した出力信号をこの制御部２２に入力することに
より、触媒コン７（−夕２０が一定以上の高温となった
場合に電磁切換弁１４．１５に一液体燃料供給から気体
燃料供給に切り換えるべく制御するようにしている。In this device, a temperature detector 21 is provided at the catalyst converter 7 (-20) provided in the exhaust pipe 19 of the engine body 1, and this temperature detector 21 is connected to a control section 22.
By inputting the output signal detected by the controller 22 into the control unit 22, the electromagnetic switching valve 14.15 switches from liquid fuel supply to gaseous fuel supply when the temperature of the catalyst converter 7 (-20) reaches a certain level or higher. I try to control it as much as possible.

すなわち、制御部２２は温度検出器２１が一定以上の高
温になった場合に閉となる接点スイッチ２３と、この接
点スイッチ２３Ｋｉ１Ｍされ各電磁切換弁１４．１５を
操作するリレー２４とを有し、これらをバッテリ電源１
６に接続してなる。リレー２４は、コイル２５に発生す
る磁力によって各電磁切換弁１４．１５の接点Ａ％Ｂに
切り換え接続する接触子２６を有する。That is, the control unit 22 includes a contact switch 23 that closes when the temperature detector 21 reaches a high temperature above a certain level, and a relay 24 that is operated by the contact switch 23Ki1M to operate each electromagnetic switching valve 14.15. These are battery power supply 1
It is connected to 6. The relay 24 has a contact 26 which is switched and connected to the contact point A%B of each electromagnetic switching valve 14, 15 by the magnetic force generated in the coil 25.

しかして、今、燃料切換スイッチ１８を液体燃料供給管
９による液体燃料供給側の接点Ｃ側に倒し、電磁切換弁
１４ｔｌｔｆｌ、１５を閉として液体燃料で運転中に、
触媒コンバータ２０の１１度が許容値以上に上昇した場
合は、一度検出器２１の温度検出により、接点スイッチ
２３が閉じ、コイル２５への通電によりリレー２４の接
点がＢ側に切り換わ、す、これにより気体燃料供給管１
２の電磁切換弁１５が開、液体燃料供給管９の電磁切換
弁１４が閉となり、エンジンへの燃料供給は液体から気
体に自動的に切り換わる。これによって、排気ガス温度
の低い気体燃料使用状態に切り換わり、触媒温度は低下
するものである。Now, the fuel changeover switch 18 is turned to the contact C side on the liquid fuel supply side by the liquid fuel supply pipe 9, and the electromagnetic changeover valves 14tltfl and 15 are closed while operating on liquid fuel.
When the temperature of the catalytic converter 20 rises to 11 degrees above the allowable value, the contact switch 23 closes once the temperature is detected by the detector 21, and the contact of the relay 24 is switched to the B side by energizing the coil 25. , thereby gaseous fuel supply pipe 1
The electromagnetic switching valve 15 of No. 2 is opened, and the electromagnetic switching valve 14 of the liquid fuel supply pipe 9 is closed, and the fuel supply to the engine is automatically switched from liquid to gas. This switches to a gaseous fuel usage state where the exhaust gas temperature is low, and the catalyst temperature decreases.

なお、所定値以下に触媒温度が低下した場合は、温度検
出器２１を介して接点２２が開き、コイル２５への通電
が停止し、リレー２４の接点は再び液体供給側の接点人
に戻り、液体燃料使用状態に戻される。Note that when the catalyst temperature falls below a predetermined value, the contact 22 opens via the temperature detector 21, energization to the coil 25 is stopped, and the contact of the relay 24 returns to the liquid supply side contact again. Returned to liquid fuel usage state.

このような構成によると、排気温度の変化に基づいて液
体燃料と気体燃料との選択使用が自動的に行なわれて、
触媒コンバータ２０の損傷が確実に防止され、ひいては
排ガス浄化に対する対策が確実なものとなる。また、触
媒コンバータ２０の機能が維持できるので装置保全の面
からも好ましいものとなる。According to such a configuration, selective use of liquid fuel and gaseous fuel is automatically performed based on changes in exhaust temperature,
Damage to the catalytic converter 20 is reliably prevented, and as a result, measures for exhaust gas purification are ensured. Further, since the function of the catalytic converter 20 can be maintained, it is preferable from the viewpoint of device maintenance.

なお、前記実施例では、ガソリンおよびＬＰＧ併用機関
について説明し九が、液体燃料および気体燃料の併用機
関であれば、各種の燃料使用機関に応用できる。In the above embodiments, an engine using a combination of gasoline and LPG is described, but the present invention can be applied to any type of engine using a combination of liquid fuel and gaseous fuel.

以上のように、本発明によれば、燃料併用燃関に対する
排ガス浄化用触媒コンバータの機能維持が確実に図れ、
装置面および環境保全の画面カ・ら好適な装置が提供で
き、所期の目的を達成しうる。As described above, according to the present invention, the function of the exhaust gas purifying catalytic converter for the fuel combustion engine can be reliably maintained;
A suitable device can be provided in terms of equipment and environmental protection, and the intended purpose can be achieved.

【図面の簡単な説明】[Brief explanation of drawings]

図は本発明の一実施例を示す概略構成図である。 １・・・機関（エンジン本体）、４・・・燃料供給部（
燃料タンク）、１０・・・気体燃料供給部（ＬＰＧタン
ク）、１４．１５・・・燃料切換部（電磁切換弁）、１
９・・・排気部（排気管）、２０・・・触媒コンバータ
、２１・・・ｍ度検出器、２２・・・制御部。 代理人　　鵜　沼　辰　之 （ほか２名）The figure is a schematic configuration diagram showing one embodiment of the present invention. 1... Engine (engine body), 4... Fuel supply section (
fuel tank), 10... gaseous fuel supply section (LPG tank), 14.15... fuel switching section (electromagnetic switching valve), 1
9... Exhaust part (exhaust pipe), 20... Catalytic converter, 21... m degree detector, 22... Control unit. Agent Tatsuyuki Unuma (and 2 others)

Claims (1)

【特許請求の範囲】[Claims] （１）共通な機関に液体燃料供給部と気体燃料供給部と
を切換え可能に接続し、排気部に排ガス浄化用の触媒コ
ンバータを設置たものにおいて、前記触媒コンバータに
ａｔ検出器を設け、この検出器から発する出力信号を入
力として一定以上の高温検出により燃料切換Ｓを液体燃
料供給φ）ら気体燃料供給に切換える制御部を設けたこ
とを特徴とする燃料併用機関の燃料供給制御装置。(1) In an engine in which a liquid fuel supply section and a gaseous fuel supply section are switchably connected to a common engine, and a catalytic converter for exhaust gas purification is installed in the exhaust section, the catalytic converter is provided with an AT detector, 1. A fuel supply control device for a fuel-combined engine, characterized in that a control section receives an output signal emitted from a detector as an input and switches the fuel switch S from a liquid fuel supply φ) to a gaseous fuel supply upon detection of a high temperature above a certain level.
JP57046110A 1982-03-23 1982-03-23 Fuel supply controller for multi-fuel engine Pending JPS58162742A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57046110A JPS58162742A (en) 1982-03-23 1982-03-23 Fuel supply controller for multi-fuel engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57046110A JPS58162742A (en) 1982-03-23 1982-03-23 Fuel supply controller for multi-fuel engine

Publications (1)

Publication Number Publication Date
JPS58162742A true JPS58162742A (en) 1983-09-27

Family

ID=12737849

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57046110A Pending JPS58162742A (en) 1982-03-23 1982-03-23 Fuel supply controller for multi-fuel engine

Country Status (1)

Country Link
JP (1) JPS58162742A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004053313A1 (en) * 2002-12-11 2004-06-24 Clean Air Partners, Inc. Catalyst heat retention system for multi-fuel engine
FR2904368A1 (en) * 2006-07-25 2008-02-01 Valeo Sys Controle Moteur Sas Heat engine e.g. wankel type rotary engine, for motor vehicle, has petrol and compressed natural gas logic controllers connected to detector for selectively activating supply circuits based on determined required performances of vehicle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004053313A1 (en) * 2002-12-11 2004-06-24 Clean Air Partners, Inc. Catalyst heat retention system for multi-fuel engine
AU2003200843B2 (en) * 2002-12-11 2009-05-21 Clean Air Power, Inc. Catalyst heat retention system for multi-fuel engine
FR2904368A1 (en) * 2006-07-25 2008-02-01 Valeo Sys Controle Moteur Sas Heat engine e.g. wankel type rotary engine, for motor vehicle, has petrol and compressed natural gas logic controllers connected to detector for selectively activating supply circuits based on determined required performances of vehicle

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