초록 ▼

A method of detecting cylinder pressure and a cylinder pressure detection device in an internal combustion engine. Two reference values are set and then adjusted so that the maximum pressure value output by a cylinder pressure sensor falls between them. At least one of the reference values is then a

A method of detecting cylinder pressure and a cylinder pressure detection device in an internal combustion engine. Two reference values are set and then adjusted so that the maximum pressure value output by a cylinder pressure sensor falls between them. At least one of the reference values is then approximated to the maximum output and the magnitude of the approximated reference value is deemed to represent the maximum value. The crank angle at which the detected maximum pressure value occurred is determined with respect to reference point such as top dead center.

대표청구항 ▼

In a method of detecting cylinder pressure in an internal combustion engine wherein the output of a cylinder pressure sensor is compared with a reference value, the result of the comparison is discriminated, the reference value is changed on the basis of the discrimination to approximate it to the m

In a method of detecting cylinder pressure in an internal combustion engine wherein the output of a cylinder pressure sensor is compared with a reference value, the result of the comparison is discriminated, the reference value is changed on the basis of the discrimination to approximate it to the maximum output value of the sensor, and the approximated reference value is deemed to represent the maximum pressure value, the improvement comprising the steps of: a. setting two initial reference values of differing magnitudes, b. confirming whether the maximum output value of the sensor falls between the two reference values and if it does not, changing at least one of the two reference values so that it does, c. changing at least one of the reference values so that one of the reference values approximates the maximum output value of the sensor, and d. deeming the one reference value approximated to the maximum output value of the sensor to represent the maximum cylinder pressure.