CIRCUIT ARRANGEMENT AND METHOD FOR EVALUATING SIGNALS OF A CRANKSHAFT SENSOR AND OF A CAMSHAFT SENSOR OF AN INTERNAL COMBUSTION ENGINE

• US 20130096872A1
• Filed: 03/31/2011
• Published: 04/18/2013
• Est. Priority Date: 03/31/2010
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Boehl, Eberhard
• Granted Patent: US 9,575,933 B2
• Time in Patent Office: Days
• US Class Current: 702/151
• CPC Class Codes: F02D 41/009 using means for generating position or synchronisation signals
• CPC Class Codes: F02D 41/222 relating to the failure of sensors or parameter detection devices
• CPC Class Codes: G06F 17/18 for evaluating statistical data , e.g. average values, frequency distributions, probability functions, regression analysis forecasting specially adapted for a specific administrative, business or logistic context G06Q10/04
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A circuit assemblage and a method for evaluating signals of a crankshaft sensor and of a camshaft sensor of an internal combustion engine are provided, the times at which the signals occur being evaluated. A position signal of a shaft of the internal combustion engine is formed from the times. Storage units are provided which simultaneously store the occurrence times of the signals of the crankshaft sensor and the occurrence times of signals of the camshaft sensor. A decision unit is provided as to whether the position signal is formed from the occurrence times of the signals of the crankshaft sensor or from the occurrence times of the signals of the camshaft sensor.

Claims

1-9. -9. (canceled)

10. A circuit assemblage for evaluating signals of a crankshaft sensor and of a camshaft sensor of an internal combustion engine, comprising:

means for detecting the times at which the signals occur, wherein a position signal of one of the crankshaft sensor and the camshaft sensor is determined based on the occurrence times of the signals;

a storage unit which simultaneously stores the occurrence times of the signals of the crankshaft sensor and the occurrence times of the signals of the camshaft sensor;

decision unit which decides whether the position signal is formed from the occurrence times of the signals of the crankshaft sensor or from the occurrence times of the signals of the camshaft sensor;

a prediction unit which uses one of the stored occurrence times of the signals of the crankshaft sensor or the stored occurrence times of the signals of the camshaft sensor to predict an occurrence time in the future of a respective one of a signal of the crankshaft sensor or a signal of the camshaft sensor; and

a calculation unit generating multiple counting pulses which, in sum, constitute the position signal, wherein the calculation unit is configured as a digital phase locked loop.

11. The circuit assemblage as recited in claim 10, wherein the decision unit includes a monitoring unit which monitors whether the crankshaft sensor and the camshaft sensor are operating correctly, and wherein the monitoring unit decides as a function of the monitoring whether the position signal is formed from the occurrence times of the signals of the crankshaft sensor or from the occurrence times of the signals of the camshaft sensor.

12. The circuit assemblage as recited in claim 11, wherein a first switching logic system for evaluating the signals of the crankshaft sensor is provided, the first switching logic system storing the arrival times of the signals of the crankshaft sensor in the storage unit of the circuit assemblage, and wherein a second switching logic system for evaluating the signals of the camshaft sensor is provided, the second switching logic system storing the arrival times of the signals of the camshaft sensor in the storage unit of the circuit assemblage.

13. A method for evaluating signals of a crankshaft sensor and of a camshaft sensor of an internal combustion engine, comprising:

detecting the times at which the signals occur, wherein a position signal of one of the crankshaft sensor and the camshaft sensor is determined based on the occurrence times of the signals;

simultaneously storing in a storage unit the occurrence times of the signals of the crankshaft sensor and the occurrence times of the signals of the camshaft sensor;

deciding by a decision unit whether the position signal is formed from the occurrence times of the signals of the crankshaft sensor or from the occurrence times of the signals of the camshaft sensor;

predicting, by a prediction unit using one of the stored occurrence times of the signals of the crankshaft sensor or the stored occurrence times of the signals of the camshaft sensor, an occurrence time in the future of a respective one of a signal of the crankshaft sensor or a signal of the camshaft sensor; and

generating, by a calculation unit, multiple counting pulses which, in sum, constitute the position signal, wherein the calculation unit is configured as a digital phase locked loop.

14. The method as recited in claim 13, wherein a monitoring unit monitors whether the crankshaft sensor and the camshaft sensor are operating correctly, and wherein the monitoring unit decides as a function of the monitoring whether the position signal is formed from the occurrence times of the signals of the crankshaft sensor or from the occurrence times of the signals of the camshaft sensor.