Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/30—Controlling fuel injection
  • F02D41/38—Controlling fuel injection of the high pressure type
• • 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
  • F02D2200/04—Engine intake system parameters
  • F02D2200/0406—Intake manifold pressure
• • 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
  • F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
  • F02D2200/703—Atmospheric pressure

Definitions

• the invention relates to a device for controlling and regulating the adjustment path of the control rod of an injection internal combustion engine depending on operating variables such as Boost pressure, external pressure, engine temperature, external temperature, fuel temperature, speed or the like, with sensors for the operating variables and the accelerator pedal position, the signal lines of which are connected to the inputs of a microcomputer.
• Devices of this type usually have one or more centrifugal force measuring devices, from whose sleeve stroke the adjustment movement and the required adjustment of the adjustment path of a control rod are derived as a function of further operating variables. It has been proposed several times to replace the extremely sensitive mechanical parts with mass-free and therefore inertia-free electronic components.
• a known proposal of this type provides for the recording of measured values for the operating variables, the signals of which are compared in a microprocessor with predetermined target values, whereupon the fuel is injected by controlling electrovalves as a function of the operating variables.
• the known device of this type is extremely complex and therefore also prone to failure.
• signals corresponding to the operating variables are used using a microcomputer to control the delivery limit stop for the adjustment path of the control rod.
• a limit stop can be supported by a suitable lever ratio so that even if only small adjustment forces are available for the adjustment of the limit stop, this stop cannot be overpressed by the control rod during operation.
• a not insignificant reaction force is exerted on the control rod, and mechanical control was therefore preferred for the adjustment of the control rod in the part-load range, with which larger adjustment forces can be easily applied.
• the invention now aims to adjust the delivery rate adjustment member, that is to say the control rod, directly over the entire speed range and in particular in the part-load range by utilizing signals from a microcomputer, as a result of which a separate delivery rate limit stop can be omitted.
• the necessary adjustment and adjustment of the adjustment of the control rod to avoid exceeding the smoke limit and to adapt to the respective operating conditions should be simplified according to the invention and the number of mechanically moving parts should be reduced to a minimum. At the same time, the flexibility to adapt to any operating parameters should be improved.
• the invention consists essentially in that a stepper motor is connected to the output of the microcomputer, which in both adjustment directions of the control rod with this connected is.
• a measured value for the accelerator pedal position is also made available to the microcomputer, it is possible to derive the control of the control rod position directly from the output signal of the microcomputer even in the area of normal driving, for which purpose the microcomputer only has the respective engine characteristics or Motor characteristic fields must be available as memory content. Corresponding logical comparisons can be used to derive an output signal from the microcomputer which corresponds to the most favorable position of the control rod.
• a stepper motor is used to convert the electrical output signals into the control rod position, and it has surprisingly been found that such a stepper motor is readily able to withstand the reaction forces of the control rod in its respective position.
• this stepper motor must be non-positively connected to the control rod in both adjustment directions of the control rod, since it should not only be effective as a limit stop and an adjustment of the control rod to zero delivery of the injection pumps, but also an adjustment of the control rod in order to increase the quantity to be injected should.
• the configuration according to the invention is preferably such that the transducers delivering digitally usable signals are connected to the digitally operating microcomputer.
• the measured value for the speed must be integrated at least over part of a full revolution in order to obtain at least one ignition pulse.
• a microcomputer By using a microcomputer, a characteristic can easily be realized in which the Integration of the measured value for the speed takes place as a function of the speed, with integration at a lower speed due to the irregular movement over a larger angle.
• the measurement value for the speed can be recorded in a structurally simple manner by arranging inductive or capacitive sensors on the pump piston shaft. However, a decrease in the measured value for the speed at the starter ring results in better dynamics.
• measured values for the boost pressure or air pressure, the air temperature, the exhaust temperature, the position of the damper for exhaust gas recirculation, the fuel temperature or the like can be used as operating variables.
• a pressure transducer with a capacitive or inductive transducer opposite the pressure membrane can be used, for example, to measure the boost pressure or air pressure.
• Constant current sources with temperature-dependent current can be used in a simple manner for measuring temperatures, such as the air, fuel or exhaust temperature.
• a conventional thermocouple that is to say a passive element such as a PTC thermistor or thermistor, can be used in a simple manner.
• the stowage flap position for the exhaust gas recirculation can in turn be detected by a capacitive or inductive proximity switch.
• the transducer for the accelerator pedal position can be designed as an angle encoder, inclinometer or potentiometer.
• Stepper motors are characterized by the fact that a separate feedback is not required for the position taken in each case. It only has to be known the starting position and is therefore according to the invention proposed that the stepper motor can be actively or passively adjusted when the injection internal combustion engine is switched off into a defined starting position, in particular into the position corresponding to the zero delivery.
• a further stepper motor connected to the microcomputer is preferably in operative connection with an adjusting element for setting the injection timing.
• a centrifugal force regulator is additionally provided according to the invention, which is connected to an adjustable control rod stop. In this way, impermissible operating conditions are avoided even in the event of a power failure by the mechanical controller.
• the device according to the invention is particularly suitable for adjusting the control rod of the injection pumps of a diesel injection internal combustion engine.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
• Combined Controls Of Internal Combustion Engines (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=3552898

Family Applications (1)

Country Status (2)

Cited By (7)

Citations (7)

• 1981
  • 1981-07-01 EP EP81890111A patent/EP0044289A1/fr not_active Withdrawn
  • 1981-07-09 JP JP10632781A patent/JPS5751919A/ja active Pending

Patent Citations (9)

Non-Patent Citations (1)

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