Jetronic Wikipedia the free encyclopedia — Volkswagen Golf Variant III

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Jetronic is a trade of a fuel injection technology for petrol engines. developed and by Robert Bosch GmbH the 1960s onwards. Bosch the concept to many automobile There are several variations of the offering technological development and


D-Jetronic (1967–1976) [ ]

Analog fuel injection. The is an abbreviation from German. . which means pressure . manifold depression (vacuum ) is using a pressure sensor in or connected to the intake manifold. in to calculate the duration of the fuel pulses. Originally, this was just called Jetronic, but the D-Jetronic was later created as a to distinguish it from the newer

K-Jetronic (1973–1994) [ edit ]

fuel injection, ‘K’ for German. Kontinuierlich . meaning . This is different from injection systems in that the flows continuously from all while the fuel pump the fuel up to approximately 5 bar (72.5 psi ). The air is taken in is also weighed to determine the amount of fuel to Commonly called ‘Continuous System’ (CIS) in the USA. system has no lambda loop or control. K-Jetronic debuted in the Porsche 911 T in January 1973, and was installed into a number of Volkswagen. Audi. BMW. Rolls-Royce. Bentley. Lotus. Peugeot. Renault. Volvo. DeLorean and Ford automobiles. The car to use K-Jetronic was the 1994 Porsche 911 3.6.

Fuel is pumped from the to a large control valve a fuel distributor . which the single fuel supply from the tank into pipes, one for each injector. The distributor is mounted atop a vane through which all air must pass, and the system by varying fuel volume to the injectors based on the angle of the air which in turn is determined by the of air passing the vane, and by the control The control pressure is regulated a mechanical device called the pressure regulator (CPR) or the regulator (WUR). Depending on the the CPR may be used to compensate for altitude, load, and/or a cold On cars equipped with an sensor. the fuel mixture is by a device called the frequency The injectors are simple spring-loaded valves with nozzles; fuel system pressure high enough to overcome the the injectors begin spraying.

K-Jetronic (Lambda) [ edit ]

A of K-Jetronic with closed-loop control, also named the letter u denominates the USA. The was developed to comply with exhaust emission regulations, and replaced by KE-Jetronic. First in the Volvo 265 in 1976.

KE-Jetronic [ edit ]

Electronically controlled fuel injection. The engine unit (ECU) may be either or digital, and the system may or may not have lambda control. The system is on the K-Jetronic mechanical system, the addition of an electro-hydraulic actuator, varies the fuel pressure to the mechanical injection components on several inputs (engine air pressure, coolant temperature, position, lambda etc.) via the With the electronics disconnected, system will operate as a system. [ 1 ]

Commonly known as ‘CIS-E’ in the The later KE3 (CIS-E III) features knock sensing

L-Jetronic (1974–1989) [ edit ]

fuel injection. L-Jetronic was called Air-Flow Controlled injection to further separate it the pressure-controlled D-Jetronic — with the in its name derived from luft . meaning air . In the system, air into the engine is measured by a vane (indicating engine known as the mass air flow (MAF) — referred to in German as the LuftMassenMesser or LMM. L-Jetronic custom-designed integrated circuits. in a simpler and more reliable control unit (ECU) the D-Jetronic’s.

L-Jetronic was used in 1980s-era European cars, [ 2 ] as as BMW K-Series motorcycles. Licensing of Bosch’s L-Jetronic concepts and Lucas. Hitachi Automotive NipponDenso. and others produced fuel injection systems for car manufacturers. Despite physical between L-Jetronic components and produced under license by manufacturers, the non-Bosch systems not be called L-Jetronic, and the parts are incompatible.

LE1-Jetronic, LE2-Jetronic, (1981–1991) [ edit ]

This is a simplified and more variant of L-Jetronic. The ECU was much to produce due to more modern and was more standardised than the ECUs. The connections between AFM and ECU are Three variants of LE-Jetronic LE1, the initial version. LE2 featured cold start integrated in the ECU, which not require the cold start and thermo time switch by older systems. LE3 (1989–), miniaturised ECU with hybrid integrated into the junction box of the

LU2-Jetronic (1983–1991) [ edit ]

Volkswagen Golf Variant III

The as LE2-Jetronic. but with closed-loop control. Initially designed for the US

LH-Jetronic (1982–1998) [ edit ]

fuel injection, introduced for bound 1982 Volvo 240 The ‘LH’ stands for German. — the hotwire anemometer used to determine the mass of air the engine. This air mass is called HLM2 ( Hitzdraht-LuftMassenmesser 2) by The LH-Jetronic was mostly used by car manufacturers, and by sports and luxury produced in small quantities, as Porsche 928. The most variants are LH 2.2, which an Intel 8049 (MCS-48 ) and usually a 4 kB programme memory, and LH which uses a Siemens microcontroller (a variant of Intel’s architecture) and 32 kB programme memory on the 27C256 chip. LH-Jetronic 2.4 has lambda control, and support for a of advanced features; including enrichment based on exhaust gas (ex. Volvo B204GT/B204FT ). Some later (post-1995) contain hardware support for generation diagnostics according to ISO (a.k.a. OBD-II ) and immobiliser [ citation needed ]

Mono-Jetronic (1988–1995) [ edit ]

fuel injection. This features one centrally positioned injection nozzle. In the US, this of single-point injection was marketed as body injection’ (TBI, by or ‘central fuel injection’ by Ford).

Mono-Jetronic is different all other known single-point in that it only relies on a position sensor for judging the load. There are no sensors for air or intake manifold vacuum. always had adaptive closed-loop control, and due to the simple engine sensing, it is heavily dependent on the sensor for correct functioning.

The ECU uses an Intel 8051 usually with 16 kiB of program and without advanced diagnostics. became a requirement in model-year

See also [ edit ]

References [ ]

^ Robert Bosch GmbH Electronicall Controlled Gasoline System with Lambda Control — KE-Jetronic. ^ Lee John De Armond (22 June L-Jetronic (archived usenet Retrieved 17 November 2009.

Volkswagen Golf Variant III
Volkswagen Golf Variant III


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