trigger_gm.cpp

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/**
 * @file    trigger_gm.cpp
 *
 * @date Mar 28, 2014
 * @author Andrey Belomutskiy, (c) 2012-2020
 */
 
#include "pch.h"
 
#include "trigger_gm.h"
 
#define GM_60_W 6
 
static float addTooth(float offset, TriggerWaveform *s) {
    s->addToothRiseFall(offset + GM_60_W / 2, GM_60_W / 2, TriggerWheel::T_SECONDARY);
    return offset + GM_60_W;
}
 
/**
 * https://github.com/rusefi/rusefi/issues/2264
 * GM/Daewoo Distributor on the F8CV
 */
void configureGm60_2_2_2(TriggerWaveform *s) {
    s->initialize(FOUR_STROKE_CAM_SENSOR, SyncEdge::RiseOnly);
    s->isSynchronizationNeeded = false;
    s->isSecondWheelCam = true;
 
    int offset = 1;
 
    for (int i=0;i<12;i++) {
        offset = addTooth(offset, s);
    }
 
    offset += 2 * GM_60_W;
 
    for (int i=0;i<18;i++) {
        offset = addTooth(offset, s);
    }
 
    offset += 2 * GM_60_W;
 
    for (int i=0;i<18;i++) {
        offset = addTooth(offset, s);
    }
 
    offset += 2 * GM_60_W;
 
    for (int i=0;i<5;i++) {
        offset = addTooth(offset, s);
    }
 
    s->addEvent360(360 - GM_60_W, TriggerValue::RISE);
 
    offset = addTooth(offset, s);
 
    s->addEvent360(360, TriggerValue::FALL);
 
}
 
void configureGmTriggerWaveform(TriggerWaveform *s) {
    s->initialize(FOUR_STROKE_CRANK_SENSOR, SyncEdge::RiseOnly);
 
    float w = 5;
 
    s->addToothRiseFall(60, w);
 
    s->addToothRiseFall(120, w);
 
    s->addToothRiseFall(180, w);
 
    s->addToothRiseFall(240, w);
 
    s->addToothRiseFall(300, w);
 
    s->addToothRiseFall(350, w);
 
    s->addToothRiseFall(360, w);
 
    s->setTriggerSynchronizationGap(6);
}
 
static int gm_tooth_pair(float startAngle, bool isShortLong, TriggerWaveform* s, float shortToothWidth)
{
    int window = (isShortLong ? shortToothWidth : (15 - shortToothWidth));
    int end = startAngle + 15;
 
    s->addEvent360(startAngle + window, TriggerValue::RISE);
    s->addEvent360(end, TriggerValue::FALL);
 
    return end;
}
 
/**
 * TT_GM_24x_5 and TT_GM_24x_3
 * https://www.mediafire.com/?40mfgeoe4ctti
 * http://www.ls1gto.com/forums/archive/index.php/t-190549.htm
 * http://www.ls2.com/forums/showthread.php/834483-LS-Timing-Reluctor-Wheels-Explained
 *
 *
 * based on data in https://rusefi.com/forum/viewtopic.php?f=3&t=936&p=30303#p30285
 */
static void initGmLS24(TriggerWaveform *s, float shortToothWidth) {
    s->initialize(FOUR_STROKE_CRANK_SENSOR, SyncEdge::Rise);
 
    /*
     * Okay, here's how this magic works:
     * The GM 24x crank wheel has 48 edges.  There is
     * a falling edge every 15 degrees (1/24 revolution).
     * After every falling edge, a rising edge occurs either
     * 5 or 10 (= 15 - 5) degrees later.  The code 0x0A33BE
     * encodes the pattern of which type of gap occurs in the
     * pattern.  Starting from the LSB, each bit left is the
     * next gap in sequence as the crank turns.  A 0 indicates
     * long-short (late rising edge), while a 1 indicates
     * short-long (early rising edge).
     *
     * The first few bits read are 0xE (LSB first!) = 0 - 1 - 1 - 1, so the pattern
     * looks like this:
     * ___     _   ___   ___     _
     *    |___| |_|   |_|   |___| |_ etc
     *
     *    |  0  |  1  |  1  |  0  |
     *
     *     ___ = 10 degrees, _ = 5 deg
     *
     * There is a falling edge at angle=0=720, and this is position
     * is #1 (and #6) TDC.  If there's a falling edge on the cam
     * sensor, it's #1 end compression stroke (fire this plug!)
     * and #6 end exhaust stroke.  If rising, it's exhaust #1,
     * compression #6.
     */
 
    uint32_t code = 0x0A33BE;
 
    int angle = 0;
 
    for(int i = 0; i < 24; i++)
    {
        bool bit = code & 0x000001;
        code = code >> 1;
 
        angle = gm_tooth_pair(angle, bit, s, shortToothWidth);
    }
}
 
// TT_GM_24x_5
void initGmLS24_5deg(TriggerWaveform *s) {
    initGmLS24(s, 5);
 
    // This is tooth #20, at 310 degrees ATDC #1
    s->setTriggerSynchronizationGap(2.0f);
    s->setSecondTriggerSynchronizationGap(0.5f);
    s->setThirdTriggerSynchronizationGap(2.0f);
 
    s->tdcPosition = 50;
}
 
// TT_GM_24x_3
void initGmLS24_3deg(TriggerWaveform *s) {
    initGmLS24(s, 3);
 
    // This is tooth #20, at 312 degrees ATDC #1
    s->setTriggerSynchronizationGap(4.0f);
    s->setSecondTriggerSynchronizationGap(0.25f);
    s->setThirdTriggerSynchronizationGap(4.0f);
 
    s->tdcPosition = 48;
}