초록 ▼

A closed loop engine roughness fuel control for an internal combustion engine operative to maintain the operation of the engine at a predetermined roughness level is disclosed herein. The control measures two rotational intervals within each torque impulse imparted to the engine\s crankshaft by the

A closed loop engine roughness fuel control for an internal combustion engine operative to maintain the operation of the engine at a predetermined roughness level is disclosed herein. The control measures two rotational intervals within each torque impulse imparted to the engine\s crankshaft by the combustion process and generates a speed normalized engine roughness signal indicative of the engine\s actual roughness. The engine roughness signal is multiplied by the engine speed and summed with a reference signal to generate a bias signal operative to modify the quantity of fuel being delivered to the engine maintaining the operation of the engine at a predetermined roughness level. A signal indicative of the first derivative of the engine speed is also summed with the reference and roughness signal to compensate for false roughness signals generated during transient modes of operation. A start enrichment circuit, activated when the engine speed is below a predetermined speed, causes the roughness control to output a fixed bias signal indicative of the engine having a roughness level greater than the desired roughness level. The fixed bias signal causes the fuel control computer to increase the quantity of fuel to the engine to enhance starting of the engine and until the engine reaches the predetermined speed.

대표청구항 ▼

A closed loop engine roughness control for an internal combustion engine having at least one combustion chamber, means for delivering a quantity of fuel to the engine in response to a fuel delivery signal, and a member receiving a torque impulse each time the fuel is burned in said at least one comb

A closed loop engine roughness control for an internal combustion engine having at least one combustion chamber, means for delivering a quantity of fuel to the engine in response to a fuel delivery signal, and a member receiving a torque impulse each time the fuel is burned in said at least one combustion chamber, comprising: position reference signal generating means for generating a position reference signal indicative of incremental positions within an engine revolution correlated with an engine event; first sensor means for generating first signals indicative of the instantaneous rotational velocity of the member relative to said position reference signal; means for generating roughness signals in response to said first signals, said roughness signals having a value indicative of the difference in magnitude between two generated torque impulses; second sensor means for generating second signals indicative of the average rotational speed of the engine; means for multiplying said second signals with said roughness signals to generate a speed corrected roughness signal; second reference signal generating means; means for summing said speed corrected roughness signal with said second reference signal to generate a roughness correction signal; means for integrating said roughness correction signal to generate a roughness bias signal; third sensor means for generating a third signal indicative of at least one other operational parameter of the engine; and fuel control means for generating said fuel delivery signals in response to said third signal and said roughness bias signal, said fuel delivery signal modified by said roughness bias signal activating said fuel delivery means to deliver a quantity of fuel to the engine maintaining said roughness signal at a predetermined value.