Fuel injection regulator for internal combustion engines

Claim 2

A regulating arrangement for an internal combustion engine, comprising, in combination, fuel injection means for introducing fuel into said engine as a function of a fuel-injection signal applied to said fuel injection means; speed sensing means coupled to said engine for providing a first signal corresponding to the speed of said engine; signalling means for providing a second signal corresponding to a desired operating characteristic of saiD engine; direct-current difference amplifier means comprising an output connected with said fuel injection means for applying thereto a fuel-injection signal; input means comprising a pair of inputs respectively connected with said speed sensing means and with said signalling means; and feedback network means connected with said output means and said input means for synthesizing a desired characteristic functional relationship between the signals at said input means and the signals generated at said output, said difference amplifier means being operative for controlling operation of said fuel injection means as a function of said first and second signals and in accordance with said characteristic functional relationship.

Claim 3

The regulating arrangement as defined in claim 1, wherein said feedback means comprises passive electrical components.

Claim 4

The regulating arrangement as defined in claim 1, wherein said engine comprises a diesel engine.

Claim 5

The regulating arrangement as defined in claim 1 wherein said feedback network means comprises means for diminishing delay times in the response of the output signal of said amplifying means relative to the input signal applied to said amplifying means.

Claim 6

The regulating arrangement as defined in claim 1 including displacement means coupled to said fuel injection means and connected to said output of said amplifier means for setting said fuel injection means to a predetermined position for introducing a predetermined quantity of fuel into said engine.

Claim 7

The regulating arrangement as defined in claim 5 wherein said displacement means comprises a hydraulic arrangement with two control valves actuated by said output of said amplifier means; a pressure chamber in which fluid flow is controlled through said control valves; a displaceable piston communicating with said pressure chamber and displaced as a function of the pressure within said chamber; and piston rod means connected between said piston head and said fuel injection means for setting said fuel injection means so that a predetermined quantity of fuel is introduced into said engine as a function of the position of said piston.

Claim 8

The regulating arrangement as defined in claim 6 including a three-point discriminator connected between the output of said amplifying means and said control valves for actuating said valves.

Claim 9

The regulating arrangement as defined in claim 7 including variable resistor means with movable contact coupled to said piston rod and electrical voltage output of said movable contact connected to said discriminator for applying to said discriminator a feedback voltage dependent upon the output displacement of said piston rod.

Claim 10

The regulating arrangement as defined in claim 5, wherein said displacement means comprises an electrical motor for displacing said fuel injection means in one direction and alternatively in the opposite direction dependent upon the quantity of fuel to be introduced into said engine.

Claim 11

The regulating arrangement as defined in claim 1 including displacement means with integral operating characteristic connected to the output of said amplifier means; and feedback means connected between the output and input of said displacement means.

Claim 12

The regulating arrangement as defined in claim 1 wherein said speed sensing means comprises an alternating current rate generator with output AC voltage having an amplitude proportional to the rotational speed of said engine; rectifying means connected to the output of said alternating current rate generator for rectifying the voltage output of said generator; and resistor-capacitor network means connected between the output of said rectifier means and input of said amplifying means.

Claim 13

The regulating arrangement as defined in claim 11 wherein the equivalent internal resistance of said rectifying means and said rate generator is equal to the equivalent load resistance applied to said rectifying means.

Claim 14

The regulating arrangement as defined in claim 12 inclUding resistor means with negative temperature coefficient connected to the output of said alternating current rate generator for temperature compensating the output voltage of said generator against fluctuations due to variations in the internal resistance of the winding of said generator due to temperature variations, said winding of said rate generator having a substantially high electrical resistance.

Claim 15

The regulating arrangement as defined in claim 1 wherein said speed sensing means comprises a rate generator providing an alternating current with frequency dependent upon the rotational speed of said engine; pulse shaping means connected to said rate generator and receiving said alternating current signal for shaping said alternating current signal into a pulsed signal; and monostable multivibrator means connected to the output of said pulse shaping means for providing rectangular-shaped pulses dependent upon the rotational speed of said engine.

Claim 16

The regulating arrangement as defined in claim 14, wherein said pulse-shaping means comprises a Schmitt trigger circuit.

Claim 17

The regulating arrangement as defined in claim 14 including a resistor-capacitor network connected to the output of said monostable multivibrator for converting rectangular-shaped pulses dependent upon said rotational speed of said engine into a DC voltage dependent upon said rotational speed, said DC voltage being applied to said one input of said amplifier.

Claim 18

The regulating arrangement as defined in claim 16 including resistor means connected between the output of said resistor-capacitor network and said one input of said amplifier.

Claim 19

The regulating arrangement as defined in claim 16, wherein the lower frequency limit of said resistance-capacitor network is higher than the highest regulating frequency.

Claim 20

A regulating arrangement for an internal combustion engine comprising, in combination, fuel injection means for introducing fuel into said engine; speed sensing means coupled to said engine for providing a signal indicative of the speed of said engine; and direct current operational amplifying means connected between said fuel injection means and said speed sensing means for regulating said fuel injection means so that the quantity of fuel injected into said engine is a function of the speed of said engine, said amplifying means having substantially high amplification at stall loads of said engine, said direct current operational amplifying means comprising a DC amplifier with feedback network, said feedback network being comprised of passive electrical components, said feedback network comprising further an adjustable resistor connected between the output and the input of said amplifier, a capacitor connected in parallel with the resistance winding of said adjustable resistor, a combination of two series-connected resistors in parallel with said capacitor and said adjustable resistor, and auxiliary capacitor means connected between ground potential and the junction of said two series-connected resistors.

Claim 21

A regulating arrangement for an internal combustion engine comprising, in combination, fuel injection means for introducing fuel into said engine; speed sensing means coupled to said engine for providing a signal indicative of the speed of said engine; and direct current operational amplifying means connected between said fuel injection means and said speed sensing means for regulating said fuel injection means so that the quantity of fuel injected into said engine is a function of the speed of said engine, said amplifying means having substantially high amplification at stall loads of said engine, said direct current operational amplifying means comprising a DC amplifier with feedback network, said feedback network being comprised of passive electrical components, said feedback network comprising further an adjustable resistor connected between the output and the input of said amplifier, a capacitor connected in parallel with the resistance winding of said adjustable resistor, a combination of two series-connected resistors in parallel with said capacitor and said adjustable resistor, and auxiliary capacitor means connected between ground potential and the junction of said two series-connected resistors.