The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 21, 1983
Filed:
Mar. 04, 1981
Pasquale Martinez, Turin, IT;
Vittorio Di Nunzio, Turin, IT;
Fiat Auto S.p.A., Turin, IT;
Abstract
An apparatus for carrying out the calibration of engines having a Bosch L-Jetronic electronic injection apparatus which is provided with an electronic control unit connected to a 'lambda' probe inserted in the exhaust pipe for the closed loop control for carburetion includes a circuit for determining the difference between the value of a correction signal when the probe is switched into the circuit and the value of the correction signal when the probe is switched out of the circuit and a display device for providing a visual display of the difference. The circuit for determining the difference in the correction signals includes first and second resistors, a voltage stabilizer, an operational amplifier having first and second inputs, a first potentiometer having its resistive element connected between the battery and ground and its wiper connected by the first resistor to the second input of the operational amplifier, a circuit for connecting the first input of the operational amplifier to the output of the integrator to receive the correction signal and a second potentimeter having its resistive element connected between the output of the voltage stabilizer and ground and its wiper connected by the second resistor to the second input of the operational amplifier.