RM0020 datasheet(34/69 Pages) STMICROELECTRONICS

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Function API

RM0020

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Also note that the function writes calculated MFB[1] at the P_MFB array position 0.

Find maximum MFBmax and minimum MFBmin value from MFB[i], i = 1,2...N-2

Calculate MFB50 value as:

Equation 31

Calculation of PMH index:

Starting with PMH_old = 0, calculate for each i = 1,2...N-1:

Equation 32

Note: There must be 8 bytes of readable memory behind input vector P_MFB and V.

Performance: See Section 7 and Table 46.

Example 15. mfb50_pmh

#include "libdsp2.h"

float P[740];

float V[740];

float K = 1.4F;

unsigned int N = 714;

float PMH;

unsigned int MFB50_index;

float MFB50;

void main(void)

{

/* from pressure vector P and volume vector V, calculate MFB50

value, PMH index and mass fraction burned (MFB), MFB

returned back in P vector, MFB1 at P array position 0 */

MFB50 = mfb50_pmh(N, P, V, K, &PMH);

/* search for MFB50 value in mass fraction burned (P) vector and

return index at which the MFB50 value was found */

MFB50_index = mfb50_index(N, P, MFB50);

}

6.16

mfb50_index - pressure sensing function 2

Function call:

unsigned int mfb50_index(unsigned int N, float *MFB, float MFB50);

MFB50

MFBmax

MFBmin

--------------------------------------------------------

DVA

V i

 Vi 1

–



–

PMA

 Pi 1

–



------------------------------------

PMH

PMH_old

PMA DVA



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