Measuring arrangement for continuous monitoring operating parameters of an internal combustion engine

A measuring arrangement for an internal combustion engine for continuously monitoring operating parameters thereof, the measuring arrangement being supplied by a supply voltage subject to fluctuations in the level thereof and comprising:

• a sensor for providing an analog signal indicative of changes in one of the parameters, said signal being affected by variations in another one of said parameters;
• a current supply arrangement for controlling and supplying current to said sensor, the current supply arrangement including:
• control supply means connected to said sensor and operating in its normal dynamic range;
• control means for detecting said fluctuations and controlling said current supply means in response thereto to maintain the same in said normal dynamic range whereby an improved signal-to-noise ratio of the output signal at said sensor is obtained;
• said control means including means for controlling said current supply means as a function of said other one of said parameters whereby said analog signal at said sensor has an amplitude independent of said other parameter;
• and,
• stabilization means connected between the supply voltage and the input of said current supply means for stabilizing the current flowing through said sensor with respect to noise impulse occurring on the supply voltage.

A measuring arrangement for an internal combustion engine for continuously monitoring operating parameters thereof, the measuring arrangement being supplied by a supply voltage subject to fluctuations in the level thereof and comprising:

• a sensor for providing a signal indicative of changes in one of the parameters;
• transistor current supply means connected to said sensor for supplying current thereto;
• circuit means connected to the supply voltage for providing a reference voltage indicative of the level of the supply voltage;
• amplifier regulation means including:
• a first input connected to said circuit means for receiving said reference voltage;
• a second input connected to the output of said current supply means for receiving a feedback signal indicative of the DC level of voltage at the output of said current supply means;
• and an output connected to the base of said transistor current supply means for shifting the operating point thereof to maintain said DC level at the same value as said reference voltage;
• and,
• parameter circuit means connected to one of said inputs of said amplifier regulation means for supplying an input signal thereto corresponding to another one of said parameters whereby the current flowing through said sensor is controlled as a function of said other parameter.

A measuring arrangement for an internal combustion engine for continuously monitoring operating parameters thereof, the measuring arrangement being supplied by a supply voltage subject to fluctuations in the level thereof and comprising:

• a sensor for providing a signal indicative of changes in one of the parameters;
• transistor current supply means connected to said sensor for supplying current thereto;
• circuit means connected to the supply voltage for providing a reference voltage indicative of the level of the supply voltage;
• amplifier regulation means including:
• a first input connected to said circuit means for receiving said reference voltage;
• a second input connected to the output of said current supply means for receiving a feedback signal indicative of the DC level of voltage at the output of said current supply means;
• and an output connected to the base of said transistor current supply means for shifting the operating point thereof to maintain said DC level at the same value as said reference voltage;
• an inverter capacitively coupled to said amplifier regulation means;
• and,
• monoflop means connected to said inverter for providing a digital signal indicative of changes in said one parameter, said monoflop means including threshold switch means adjustable in dependence upon another one of said parameters.