Method and apparatus for controlling the operation of a diesel engine
First Claim
1. A method for controlling the full load fuel supply quantity to a Diesel engine, said engine being equipped with a mechanical speed governor, a fuel injection pump including a fuel quantity control rod, said speed governor serving to adjust the amount of fuel admitted to said engine by setting the position of the fuel quantity control rod in said fuel injection pump, and a control system including a full load stop, the position of which is set to limit the travel of said control rod, said method comprising the steps of:
- generating a first signal related to engine speed and a second signal related to the air mass flow rate;
using said first and second signals to select information regarding the maximum amount of fuel from a primary data-set comprising a family of curves containing information regarding the maximum amount of fuel to be admitted to said engine by the fuel injection pump at full load for a given engine speed and for a given air mass flow rate into said engine; and
applying said information to the control system to thereby set the position of said full load stop;
whereby the full load operation of said engine is operated at optimum efficiency.
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Abstract
A method and apparatus for controlling a Diesel engine by limiting the amount of fuel to be admitted to the engine in dependence on engine speed and on the air mass flow rate. The invention provides a primary set of stored data interrelating these variables. The primary data set is used to generate a set-point value for the position of a movable stop member which limits the mechanical travel of the fuel control rack in the fuel injection pump; the control rack is also subject to the action of a mechanical speed governor. Additional corrections of the maximum amount of fuel are made on the basis of air temperature and fuel temperature. Still further refinements include taking into account exhaust gas temperature and engine starting conditions. The final corrected set-point signal is then compared with the output from a position indicator which is attached to the stop member. A servo-controlled element corrects the position of the stop member until the error indications are minimized in a closed loop, feedback control circuit.
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Citations
33 Claims
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1. A method for controlling the full load fuel supply quantity to a Diesel engine, said engine being equipped with a mechanical speed governor, a fuel injection pump including a fuel quantity control rod, said speed governor serving to adjust the amount of fuel admitted to said engine by setting the position of the fuel quantity control rod in said fuel injection pump, and a control system including a full load stop, the position of which is set to limit the travel of said control rod, said method comprising the steps of:
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generating a first signal related to engine speed and a second signal related to the air mass flow rate; using said first and second signals to select information regarding the maximum amount of fuel from a primary data-set comprising a family of curves containing information regarding the maximum amount of fuel to be admitted to said engine by the fuel injection pump at full load for a given engine speed and for a given air mass flow rate into said engine; and applying said information to the control system to thereby set the position of said full load stop; whereby the full load operation of said engine is operated at optimum efficiency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for controlling the full load fuel supply quantity to a Diesel engine, including:
- a mechanical speed governor;
a fuel injection pump including a fuel quantity control rod, said governor serving to adjust the amount of fuel admitted to said engine by setting the position of the fuel quantity control rod in said fuel injection pump;
a control system including a control mechanism and a full load stop, the position of which is set to limit the travel of said control rod; andan electronic feedback control circuit for actuating said control mechanism, said feedback control circuit including a full load control function generator for generating a set-point signal related to the full-load control position of said fuel control rod, said full load control function generator having a data-set comprising a family of curves containing stored information regarding the maximum amount of fuel to be admitted to said engine by the fuel injection pump at full load as a function of engine speed and air mass flow rate into said engine, a control amplifier, a position indicator for generating a position signal related to the position of said full load stop, said position signal being coupled to the input of said control amplifier and the set-point signal from said full load control function generator also being coupled to the input of said control amplifier, said control amplifier generating an output control signal which actuates said control mechanism, a transducer for sensing engine speed, and a transducer for sensing air mass flow rate, the output from said transducers being coupled to said full load control function generator to thereby select the stored information in said data-set; whereby the position of said full load stop is changed in accordance with said set-point signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
- a mechanical speed governor;
Specification