ObdGraphsLogViewer/help_spark.html at main · tzebrowski/ObdGraphsLogViewer · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Spark Advance Guide</title>
    <style>
      :root {
        --bg-color: #ffffff;
        --text-color: #333333;
        --card-bg: #f8f9fa;
        --border-color: #e0e0e0;
        --accent-color: #c22636; /* Alfa Red style */
        --success-color: #28a745;
        --warning-color: #ffc107;
        --danger-color: #dc3545;
      }

      @media (prefers-color-scheme: dark) {
        :root {
          --bg-color: #1a1a1a;
          --text-color: #e0e0e0;
          --card-bg: #2d2d2d;
          --border-color: #404040;
          --warning-color: #ffc107; /* Keep it bright for visibility */
        }
      }

      body {
        font-family:
          -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica,
          Arial, sans-serif;
        line-height: 1.6;
        color: var(--text-color);
        background-color: var(--bg-color);
        margin: 0;
        padding: 20px;
      }

      .container {
        max-width: 800px;
        margin: 0 auto;
      }

      h1,
      h2,
      h3 {
        color: var(--text-color);
        margin-top: 1.5em;
      }

      h1 {
        border-bottom: 2px solid var(--accent-color);
        padding-bottom: 10px;
        margin-top: 0;
      }

      h3 {
        display: flex;
        align-items: center;
        gap: 10px;
      }

      .section-card {
        background-color: var(--card-bg);
        border: 1px solid var(--border-color);
        border-radius: 8px;
        padding: 20px;
        margin-bottom: 20px;
      }

      ul {
        padding-left: 20px;
      }

      li {
        margin-bottom: 8px;
      }

      strong {
        font-weight: 600;
      }

      /* Table Styling */
      table {
        width: 100%;
        border-collapse: collapse;
        margin-top: 15px;
        font-size: 0.95em;
      }

      th,
      td {
        padding: 12px 15px;
        text-align: left;
        border-bottom: 1px solid var(--border-color);
      }

      th {
        background-color: rgba(0, 0, 0, 0.05);
        font-weight: bold;
      }

      @media (prefers-color-scheme: dark) {
        th {
          background-color: rgba(255, 255, 255, 0.05);
        }
      }

      /* Status Badges */
      .status-badge {
        display: inline-block;
        padding: 4px 8px;
        border-radius: 4px;
        font-size: 0.85em;
        font-weight: bold;
        color: #fff;
      }

      .status-success {
        background-color: var(--success-color);
      }
      .status-warning {
        background-color: var(--warning-color);
        color: #333;
      }
      .status-danger {
        background-color: var(--danger-color);
      }

      .icon-large {
        font-size: 1.2em;
      }

      .note {
        font-size: 0.9em;
        color: #666;
        font-style: italic;
      }
      @media (prefers-color-scheme: dark) {
        .note {
          color: #aaa;
        }
      }
    </style>
  </head>
  <body>
    <div class="container">
      <h1>⚡ Understanding Spark Advance</h1>

      <p>
        Spark Advance (Ignition Timing) determines <em>when</em> the spark plug
        fires relative to the piston's position. It is measured in degrees of
        crankshaft rotation relative to <strong>Top Dead Center (TDC)</strong>.
      </p>

      <div class="section-card">
        <h3>➕ Positive Values (Advanced Timing)</h3>
        <p>
          <strong>Definition:</strong> The spark occurs
          <strong>BEFORE</strong> the piston reaches the very top (BTDC).
        </p>
        <ul>
          <li>
            <strong>Context:</strong> This is the normal operating state for
            producing power.
          </li>
          <li>
            <strong>Why?</strong> The air-fuel mixture takes time to burn.
            Igniting it early ensures the maximum explosion pressure hits the
            piston exactly as it starts its downward journey.
          </li>
          <li>
            <strong>Typical Behavior:</strong>
            <ul>
              <li><strong>Idle:</strong> +5° to +15°</li>
              <li><strong>Cruising:</strong> +30° to +45° (High efficiency)</li>
              <li>
                <strong>Full Throttle (WOT):</strong> +10° to +25° (Maximum
                Power)
              </li>
            </ul>
          </li>
        </ul>
      </div>

      <div class="section-card">
        <h3>➖ Negative Values (Retarded Timing)</h3>
        <p>
          <strong>Definition:</strong> The spark occurs
          <strong>AFTER</strong> the piston has passed the top point (ATDC).
        </p>
        <ul>
          <li>
            <strong>Context:</strong> Generally inefficient for power, but used
            for specific ECU strategies.
          </li>
          <li>
            <strong>Common Scenarios:</strong>
            <ul>
              <li>
                <strong>Cold Start (Cat Heating):</strong> Modern engines delay
                ignition (e.g., -15°) to burn fuel in the exhaust, heating the
                catalytic converter rapidly.
              </li>
              <li>
                <strong>Gear Shifts:</strong> The ECU momentarily pulls timing
                (often to negative) during shifts to reduce torque and protect
                the transmission (ZF 8HP).
              </li>
            </ul>
          </li>
        </ul>
      </div>

      <div class="section-card">
        <h3>🚀 Analyzing Full Throttle Data</h3>
        <p>When analyzing a log with 100% accelerator pedal position:</p>
        <ul>
          <li>
            <strong>Goal:</strong> You want to see a smooth,
            <strong>positive (+) curve</strong> (e.g., +10° to +25°).
          </li>
          <li>
            <strong>⚠️ Knock Detection:</strong> If you see a "sawtooth" pattern
            where timing climbs and suddenly drops by 3° or more (without a gear
            shift), the ECU is likely detecting knock.
          </li>
          <li>
            <strong>❌ Danger Zone:</strong> If timing stays at
            <strong>0° or negative</strong> during a pull (and no gear shift is
            happening), it indicates severe knock, extreme intake temps, or
            engine issues.
          </li>
        </ul>
      </div>

      <h3>📊 Quick Reference Table</h3>
      <table>
        <thead>
          <tr>
            <th style="width: 25%">Value Range</th>
            <th style="width: 45%">Meaning</th>
            <th>Status</th>
          </tr>
        </thead>
        <tbody>
          <tr>
            <td>+10° to +25°</td>
            <td>Full Throttle Acceleration</td>
            <td>
              <span class="status-badge status-success"
                >✅ Healthy (Power)</span
              >
            </td>
          </tr>
          <tr>
            <td>+30° to +45°</td>
            <td>Light Load / Cruising</td>
            <td>
              <span class="status-badge status-success"
                >✅ Healthy (Economy)</span
              >
            </td>
          </tr>
          <tr>
            <td>-10° to -20°</td>
            <td>Cold Start (First ~30s)</td>
            <td>
              <span class="status-badge status-success"
                >✅ Normal (Warm-up)</span
              >
            </td>
          </tr>
          <tr>
            <td>Sharp Drop (to -10°)</td>
            <td>Gear Shift</td>
            <td>
              <span class="status-badge status-success"
                >✅ Normal (Smoothness)</span
              >
            </td>
          </tr>
          <tr>
            <td>Sudden Drop (-3°)</td>
            <td>Knock Detected</td>
            <td><span class="status-badge status-warning">⚠️ Caution</span></td>
          </tr>
          <tr>
            <td>Zero / Negative</td>
            <td>Full Throttle (No Shift)</td>
            <td>
              <span class="status-badge status-danger">❌ Critical Issue</span>
            </td>
          </tr>
        </tbody>
      </table>

      <p class="note" style="margin-top: 20px">
        * Note: Values may vary slightly depending on engine tuning, fuel
        quality (95/98/100 RON), and ambient conditions.
      </p>
    </div>
  </body>
</html>