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Input signal processor used in electronic engine control apparatus

  • US 4,280,189 A
  • Filed: 10/18/1978
  • Issued: 07/21/1981
  • Est. Priority Date: 10/19/1977
  • Status: Expired due to Term
First Claim
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1. In a control apparatus for an internal combustion engine having:

  • sensor means for monitoring operating conditions of the engine and producing signals, including any ripple components, representative thereof;

    conversion means for converting the signals produced by said sensor means into digital data representative thereof;

    actuator means for controlling respective energy conversion functions of said engine in response to control signals applied thereto; and

    a data processing unit for carrying out engine actuator control data processing operations in accordance with digital data produced by said conversion means and thereby generating output control signals to be coupled to control said actuator means in accordance with the results of said data processing operations, said data processing unit containing a central processing unit, a random access memory and a read only memory;

    a method of operating said apparatus, so as to remove any ripple components present in signals X produced by said sensor means and correspondingly converted into digital data by said conversion means, so as to obtain filtered signals Y in response to which said data processing unit operates in carrying said engine actuator control data processing operations, comprising the steps of;

    sampling the digital data produced by said conversion means at periodic instants in time ti, to obtain for each sampling time a first digital signal sample Xi representative of the output of said actuator means including any ripple data for that respective sampling time ti, and storing a physical record of said digital signal sample Xi in said random access memory;

    storing in said random access memory a physical record of the results of a prescribed filtering process operation through which a filtered signal sample Yi is derived by said central processing unit in response to said sample Xi and a previously-derived filtered sample Yi-1 for a digital signal sample Xi-1 at sampling time ti-1 ;

    applying a previously-derived and stored filtered sample Yi-1 and said first digital signal sample Xi from said random access memory to said central processing unit wherein a filtered signal sample Yi for said sampling time ti is obtained in accordance with a prescribed relationship between said digital signal sample Xi and said stored previously-derived filtered sample Yi-1 for the previous sampling time ti-1 ;

    storing a physical record of said filtered signal sample Yi in said random access memory;

    generating output control signals by coupling said filter signal sample Yi to said data processing unit in which engine actuator control data processing operations are carried out; and

    causing said output control signals to be coupled to said actuator means whereby said respective energy conversion functions of said engine are controlled.

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