Electronic control apparatus and memory apparatus for electronic control apparatus
First Claim
1. An electronic control apparatus which incorporates a floating-point arithmetic function and performs various types of calculation and control operations in accordance with a predetermined computer program, comprising conversion means for operating on map data that comprise a set of map points and a set of map values respectively corresponding to said map points, to convert at least one of said set of map points and set of map values from fixed-point representation to floating-point representation.
1 Assignment
0 Petitions
Accused Products
Abstract
An electronic control apparatus has a memory which stores a map consisting of a set of map points and corresponding set of map values, with the map values representing respective physical quantity values, and at least one of the sets of map points and map values being stored as fixed-point representation data. When a map point is specified, the apparatus obtains a corresponding physical quantity value by converting fixed-point data of the map to floating-point representation, then using a floating-point arithmetic unit to perform an interpolation calculation using the converted data.
-
Citations
16 Claims
-
1. An electronic control apparatus which incorporates a floating-point arithmetic function and performs various types of calculation and control operations in accordance with a predetermined computer program, comprising
conversion means for operating on map data that comprise a set of map points and a set of map values respectively corresponding to said map points, to convert at least one of said set of map points and set of map values from fixed-point representation to floating-point representation.
-
13. A memory apparatus for an electronic control apparatus, said electronic control apparatus executing various types of calculation and control processing in accordance with a predetermined program and having a floating-point arithmetic function, and said memory apparatus having stored therein map data which are used in floating-point calculations,
wherein said map data include a set of map points and a set of map values that respectively correspond to said map points, with at least one of said set of map points and said set of map values being expressed by fixed-point representation data, and wherein said memory apparatus has stored therein, in conjunction with said map data, a LSB conversion value that is expressed in floating-point representation and represents a physical quantity value that has been predetermined as corresponding to a least significant bit of said fixed-point representation data.
Specification