US 4,197,767 AGranted

Warm up control for closed loop engine roughness fuel control

AssigneeThe Bendix Corporation

InventorChun-Keung Leung

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Abstract

A warm-up control for a closed loop engine roughness control responsive to engine load and engine temperature is disclosed herein. The warm-up control provides a first correction signal to the closed loop engine roughness control operative to increase the effective value of the roughness signal in response to a signal indicative of a load being applied to the engine and the engine temperature being below a predetermined temperature and a second correction signal to the closed loop engine roughness control operative to decrease the effective value of the roughness signal in response to a signal indicative of a light engine load and the engine temperature being below a predetermined temperature. The control also generates a transient signal in response to a sudden increase of the engine's load operative to cause the closed loop engine roughness control to generate a fixed output signal for a predetermined length of time. The fuel control computer in response to the fixed output signal generates signals increasing the fuel delivery to the engine to prevent the engine from stumbling or stalling with the application of the load.

Claims19

Dependent claims

A warm-up control for an internal combustion engine having sensors generating signals indicative of the operational parameters of the engine including a temperature sensor generating a temperature signal indicative of the engine's temperature, and a load sensor generating a load signal indicative of the engine's load, fuel control means for generating fuel delivery signals indicative of the engine's fuel requirements in response to the signals generated by said sensor and other input signals and a fuel delivery means for delivering fuel to the engine in response to the fuel delivery signals, said warm-up control comprising:

first signal generator means for generating a first warm-up correction signal having a value variable as a first function of the engine temperature below a first predetermined temperature;
second signal generator means for generating a second warm-up signal having a value variable as a second function of the temperature signal below a second predetermined temperature;
switch means controlling the transmission of the signals generated by said first and second signal generators to the fuel control means in response to the load signal, said switch means transmitting the signal generated by said first signal generator means to the fuel control means when the load signal is indicative of a load applied to the engine, and transmitting the signal generated by said second signal generator to the fuel control means when the load signal is indicative of the absence of a load. PG,144

Dependencies are inferred from the claim text.