Relative quantities of CO; HC; NOX P Adapting to specific operating conditions Certain operating states cause fuel requirements to deviate substantially from the steady-state requirements of an engine warmed to its normal temperature, thus necessitating corrective adaptations in the mixture-formation apparatus. The following descriptions apply to the conditions found in engines with manifold injection.
Inlet manifold depression vacuum is measured using a pressure sensor located in, or connected to the intake manifoldin order to calculate the duration of fuel injection pulses.
Originally, this system was called Jetronic, but the name D-Jetronic was later created as a retronym to distinguish it from newer versions. D-Jetronic was a precursor of modern common rail systems as it had constant pressure fuel delivery to the injectors and pulsed injections, albeit grouped 2 groups of injectors pulsed together rather than sequential individual injector pulses as on later systems.
D-Jetronic used analogue circuitry, with no microprocessor nor digital logicthe ECU utilised about 25 transistors to perform all of the processing. The lack of processing power and the unavailability of solid-state sensors meant that the vacuum sensor was a rather expensive precision instrument, rather like a barometerwith brass bellows inside to measure the manifold pressure.
Although conceptually similar to most later systems with individual electrically controlled injectors per cylinder, and pulse-width modulated fuel delivery, the fuel pressure was not modulated by manifold pressure, and the injectors were fired only once per 2 revolutions on the engine with half of the injectors being fired each revolution.
The system was last used with a Lucas designed timing mechanism and Lucas labels super-imposed on some components on the Jaguar V12 engine XJ12 and XJ-S from until The volume of air taken in by the engine is measured to determine the amount of fuel to inject.
This system has no lambda loop or lambda control. K-Jetronic debuted in the The final car to use K-Jetronic was the Porsche Turbo 3.
Fuel is pumped from the tank to a large control valve called a fuel distributor, which divides the single fuel supply line from the tank into smaller lines, one for each injector.
The fuel distributor is mounted atop a control vane through which all intake air must pass, and the system works by varying fuel volume supplied to the injectors based on the angle of the air vane in the air flow meterwhich in turn is determined by the volume of air passing the vane, and by the control pressure.
The control pressure is regulated with a mechanical device called the control pressure regulator CPR or the warm-up regulator WUR. The injectors are simple spring-loaded check valves with nozzles; once fuel system pressure becomes high enough to overcome the counterspring, the injectors begin spraying.
K-Jetronic Lambda [ edit ] First introduced in the Volvo in The system was developed to comply with U. KE-Jetronic — [ edit ] Electronically controlled mechanical fuel injection. The engine control unit ECU may be either analog or digital, and the system may or may not have closed-loop lambda control.
Mar 02, · Gasoline Model Mercedes Sitting Too Long: Bosch CIS Fuel Injection Age Related Issues with Kent Bergsma k-jetronic adjusting warm-up valve, system . MPFI means – Multi-point Fuel-Injection (also called fuel-injection system) [pic] The term MPFI is used to specify a technology used in Gasoline/petrol Engines. For Diesel Engines, there is a similar technology called CRDI. Approximately up until mechanical fuel injection systems have been installed on certain Mercedes, Audi, Volkswagen, Ford etc. car models – starting with Bosch K-Jetronic, and after that – Bosch KE-Jetronic. These fuel injection systems were considered to be really reliable and trustworthy.
The system is based on the K-Jetronic mechanical system, with the addition of an electro-hydraulic actuator, essentially a fuel injector inline with the fuel return.
Instead of injecting fuel into the intake, this injector allows fuel to bypass the fuel distributor, which varies the fuel pressure supplied to the mechanical injection components based on several inputs engine speed, air pressure, coolant temperature, throttle position, lambda etc.
With the electronics disconnected, this system will operate as a K-Jetronic system.
L-Jetronic — [ edit ] Analog fuel injection.Mar 02, · Gasoline Model Mercedes Sitting Too Long: Bosch CIS Fuel Injection Age Related Issues with Kent Bergsma k-jetronic adjusting warm-up valve, system . Combustion in the gasoline engine The spark-ignition or Otto-cycle engine 2 Gasoline-engine management Technical requirements 4 Cylinder charge 5.
BOSCH L-Jetronic Injection regardbouddhiste.com Author: Crit Keywords: Bosch L-Jetronic L Jetronic RX-7 Brought to you by the team at regardbouddhiste.com Created Date. fuel injection Although current systems rely almost Although the K-Jetronic layout served as exclusively on mixture formation outside the mechanical basis for the KE-Jetronic the combustion chamber..
Gasoline injection systems. concepts based system. Approximately up until mechanical fuel injection systems have been installed on certain Mercedes, Audi, Volkswagen, Ford etc.
car models – starting with Bosch K-Jetronic, and after that – Bosch KE-Jetronic. These fuel injection systems were considered to be really reliable and trustworthy.
Jetronic is a trade name of a fuel injection technology for automotive petrol engines, developed and marketed by Robert Bosch GmbH from the s onwards. Bosch licensed the concept to many automobile manufacturers.