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docs(measurement): 新增 PD132T 端到端时序图（三段横轴）+ 符号约定勘误 + 生成工具

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- 图示 docs/img/timing-chain-pd132t.{svg,png}：① 一个窗（0~11.2ms）② 检测到输出（0~600ms）③ 基线块平均（0~12s）
  · 曲线按 §1~§4 公式真算：Xn=480 tick/160µs、窗=68×480/3MHz=10.880ms、α=79(τ=35.26ms)、
    dlt=(32640×60)>>16=29、判据线 32611、大信号(+0.5%) 第 1 窗即越线(t≈10.9ms)、小信号(+0.1%) ≈2.2τ≈78ms
  · 同时标注：两种检测路径、50ms 输出节拍量化、上电时 Origin 只有首窗单点样本
- 新工具 tools/plot_timing_chain.py：纯 stdlib 手写 SVG；chromium --headless 转 PNG（零第三方依赖）
- ⚠ 新增 §0.1 符号约定：车辆 ⇒ L↓ ⇒ f↑ ⇒ 周期/Xn↓ ⇒ Value/CAPVD↓（判据取下降侧）
  ⇒ 修正 5 处「深占压（频偏 −5%）⇒ 窗 +5.3%」的方向错误：车辆是频率升高、窗长应【缩短】(−4.8%)
- README：目录树补 img/ 与两个 tools 脚本；表格校验 0 异常（15 文件）
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docs/cross-model-comparison.md
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| **基线更新周期** | **0.82 s**（100 窗；⚠ 勘误） | **2.73 s** | **1.09 s**（勘误） | **5.59 s**（256 窗） | **5 s**（500 窗） | **4.37 s**（500 窗） |
| IIR 时间常数 τ | **22~27 ms**（⚠ 勘误） | 88 ms / 109 ms | **35.4 / 43.7 ms**（α79/α64；精确 29.6 / 38.0） | 87 ms（精确 76.0） | 32 ms | **28 ms** |
> ⚠ **测量节拍是区间，不是定值**（2026-09-11 补）：`LPCNT = ⌊BASE/Xn₀⌋` 是**整数除法且学习后冻结**，窗长 = `⌊BASE/Xn₀⌋·Xn₁` 个 tick ⇒ **上表中"测量节拍 / 基线更新周期 / IIR 时间常数"三行数值均为标称上限**。站点实际值 = 标称 × `(BASE−r₀)/BASE` × `f₀/f_now`（`r₀ = BASE mod Xn₀`）：100kHz 站点 **−0.39%**、60kHz 站点 **−2.34%**、带内最差 **−6.2%**（Xn₀=2049）；深占压（频偏 −5%）再 +5.3%。**Δf/f 口径不受影响**（`Value/Origin = Xn₁/Xn₀` 精确，余数完全约掉）。公式/数值表/位宽约束（`INT8U LPCNT` ⇒ 需 `Xn>129`）见 [measurement-window-quantization.md](measurement-window-quantization.md)。
> ⚠ **测量节拍是区间，不是定值**（2026-09-11 补）：`LPCNT = ⌊BASE/Xn₀⌋` 是**整数除法且学习后冻结**，窗长 = `⌊BASE/Xn₀⌋·Xn₁` 个 tick ⇒ **上表中"测量节拍 / 基线更新周期 / IIR 时间常数"三行数值均为标称上限**。站点实际值 = 标称 × `(BASE−r₀)/BASE` × `f₀/f_now`（`r₀ = BASE mod Xn₀`）：100kHz 站点 **−0.39%**、60kHz 站点 **−2.34%**、带内最差 **−6.2%**（Xn₀=2049）；深占压（Δf/f +5%，频率升高）窗长再 **−4.8%**。**Δf/f 口径不受影响**（`Value/Origin = Xn₁/Xn₀` 精确，余数完全约掉）。公式/数值表/位宽约束（`INT8U LPCNT` ⇒ 需 `Xn>129`）见 [measurement-window-quantization.md](measurement-window-quantization.md)。
>
> IIR 系数 79/64 的量化对比（α/τ/阶跃响应/噪声抑制/单频衰减/模拟验证）见 [filter-coefficient-79-vs-64.md](filter-coefficient-79-vs-64.md)（2026-08-28 新增；**2026-08-31 v2 扩展：时间常数公式详解 + 释放路径影响 + 方案 A 案例**）。
docs/filter-coefficient-79-vs-64.md
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| DLD154V4B | 10 ms | **32 ms** | 40 ms |
| DLD154Pro | 8.74 ms | 28 ms | 35 ms |
> ⚠ **表中 T 是"标称上限"**（2026-09-11 补）：实际测量窗 = `⌊BASE/Xn₀⌋·Xn₀/f_cap`，按**站点线圈频率**浮动 0 ~ −6.2%（100kHz 站点 −0.39%），深占压再 +5%；**τ 按同一因子缩放**（本表未逐一改写，读数时按百分比折算即可）。公式与数值表见 [measurement-window-quantization.md](measurement-window-quantization.md)。
> ⚠ **表中 T 是"标称上限"**（2026-09-11 补）：实际测量窗 = `⌊BASE/Xn₀⌋·Xn₀/f_cap`，按**站点线圈频率**浮动 0 ~ −6.2%（100kHz 站点 −0.39%），深占压（Δf/f +5%）窗长 −4.8%；**τ 按同一因子缩放**（本表未逐一改写，读数时按百分比折算即可）。公式与数值表见 [measurement-window-quantization.md](measurement-window-quantization.md)。
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<text x="424.3" y="308.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="13" fill="#c1121f" text-anchor="middle" font-weight="normal">Xn = 相邻捕获差 = 480 tick = 160 µs（= Xn/f_cap）</text>
<text x="236.0" y="488.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="15" fill="#0b2c4d" text-anchor="end" font-weight="bold">A3 CapSum</text>
<text x="236.0" y="506.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="12" fill="#777" text-anchor="end" font-weight="normal">Σ Xn（tick）</text>
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<text x="1476.0" y="352.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="12" fill="#777" text-anchor="start" font-weight="normal">32768（BASE 标称）</text>
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<text x="258.0" y="334.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="14" fill="#a35b00" text-anchor="start" font-weight="normal">每 160 µs 累加一次 Xn（共 68 级台阶）⇒ CapCnt≥LPCNT 时「窗结账」</text>
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<text x="236.0" y="568.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="12" fill="#777" text-anchor="end" font-weight="normal">每窗更新一次</text>
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<text x="1423.1" y="536.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="14" fill="#0a58ca" text-anchor="end" font-weight="normal">窗边界 10.88 ms（本窗只含 0.6~10.88 ms ⇒ 部分反映）</text>
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<text x="28.0" y="682.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="17" fill="#0a58ca" text-anchor="start" font-weight="bold">② 中观：检测延迟与输出（0 ~ 600 ms）　车辆进入 @0.6 ms</text>
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<text x="250.0" y="1121.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="13" fill="#666" text-anchor="middle" font-weight="normal">0</text>
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<text x="453.3" y="1121.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="13" fill="#666" text-anchor="middle" font-weight="normal">100 ms</text>
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<text x="656.7" y="1121.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="13" fill="#666" text-anchor="middle" font-weight="normal">200 ms</text>
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<text x="860.0" y="1121.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="13" fill="#666" text-anchor="middle" font-weight="normal">300 ms</text>
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<text x="1063.3" y="1121.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="13" fill="#666" text-anchor="middle" font-weight="normal">400 ms</text>
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<text x="1266.7" y="1121.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="13" fill="#666" text-anchor="middle" font-weight="normal">500 ms</text>
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<text x="1470.0" y="1121.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="13" fill="#666" text-anchor="middle" font-weight="normal">600 ms</text>
<text x="236.0" y="1103.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="15" fill="#0b2c4d" text-anchor="end" font-weight="bold">时间</text>
<text x="236.0" y="998.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="15" fill="#0b2c4d" text-anchor="end" font-weight="bold">B1 CAPVD</text>
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<text x="1476.0" y="821.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="12" fill="#0a58ca" text-anchor="start" font-weight="normal">Origin 32640（基线）</text>
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<text x="1476.0" y="848.7" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="12" fill="#c1121f" text-anchor="start" font-weight="normal">判据线 32611（−dlt=29 / 0.0916%）</text>
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<text x="282.1" y="832.7" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="14" fill="#c1121f" text-anchor="start" font-weight="normal">越线 ⇒ 有车（大信号 Δf/f=+0.5%：第 1 窗即越线，t≈10.9 ms）</text>
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<text x="416.9" y="890.7" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="14" fill="#1f6fb2" text-anchor="start" font-weight="normal">小信号 Δf/f=+0.1%：≈2.2τ 才越线（t≈76 ms）—— τ 主导</text>
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<text x="1032.0" y="722.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="16" fill="#0a58ca" text-anchor="start" font-weight="bold">两种检测路径（同一条判据）</text>
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<text x="1032.0" y="788.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="14" fill="#333" text-anchor="start" font-weight="normal">⇒ 延迟 ≈ 窗平均(≤1 窗) + IIR + 输出节拍(50 ms)</text>
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<text x="236.0" y="1064.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="12" fill="#777" text-anchor="end" font-weight="normal">FLAG_IN / 脉冲</text>
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<text x="256.0" y="1100.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="14" fill="#0a7d4b" text-anchor="start" font-weight="normal">50 ms 主节拍（T1 ISR）量化：FLAG_IN 在下一拍被消费 ⇒ 输出起点 ≤ 越线+50 ms。绿=继电器脉冲输出（500 ms）</text>
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<text x="453.3" y="1371.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="13" fill="#666" text-anchor="middle" font-weight="normal">2 s</text>
<line x1="656.7" y1="1348.0" x2="656.7" y2="1355.0" stroke="#888" stroke-width="1.0" opacity="1.00"/>
<text x="656.7" y="1371.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="13" fill="#666" text-anchor="middle" font-weight="normal">4 s</text>
<line x1="860.0" y1="1348.0" x2="860.0" y2="1355.0" stroke="#888" stroke-width="1.0" opacity="1.00"/>
<text x="860.0" y="1371.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="13" fill="#666" text-anchor="middle" font-weight="normal">6 s</text>
<line x1="1063.3" y1="1348.0" x2="1063.3" y2="1355.0" stroke="#888" stroke-width="1.0" opacity="1.00"/>
<text x="1063.3" y="1371.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="13" fill="#666" text-anchor="middle" font-weight="normal">8 s</text>
<line x1="1266.7" y1="1348.0" x2="1266.7" y2="1355.0" stroke="#888" stroke-width="1.0" opacity="1.00"/>
<text x="1266.7" y="1371.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="13" fill="#666" text-anchor="middle" font-weight="normal">10 s</text>
<line x1="1470.0" y1="1348.0" x2="1470.0" y2="1355.0" stroke="#888" stroke-width="1.0" opacity="1.00"/>
<text x="1470.0" y="1371.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="13" fill="#666" text-anchor="middle" font-weight="normal">12 s</text>
<text x="236.0" y="1353.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="15" fill="#0b2c4d" text-anchor="end" font-weight="bold">时间</text>
<text x="236.0" y="1318.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="15" fill="#0b2c4d" text-anchor="end" font-weight="bold">C1 Origin</text>
<text x="236.0" y="1336.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="12" fill="#777" text-anchor="end" font-weight="normal">基线（块平均）</text>
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<text x="258.0" y="1340.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="13" fill="#c1121f" text-anchor="start" font-weight="normal">上电：Origin = 首窗单点（噪声最大）</text>
<text x="1476.0" y="1299.5" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="12" fill="#777" text-anchor="start" font-weight="normal">真值</text>
<text x="1476.0" y="1277.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="12" fill="#0a58ca" text-anchor="start" font-weight="normal">PD132T: 100 窗=1.088 s（蓝）</text>
<text x="1476.0" y="1299.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="12" fill="#888" text-anchor="start" font-weight="normal">PD136HA: 256 窗=5.571 s（灰）</text>
<text x="605.8" y="1206.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="14" fill="#0b2c4d" text-anchor="middle" font-weight="normal">块平均 ⇒ 基线跟踪是「阶梯式」，块内一直用上一块的均值；有车期间冻结并重新累计</text>
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<text x="40.0" y="1422.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="16" fill="#0a58ca" text-anchor="start" font-weight="bold">四条关系（讨论快慢时用「窗」最稳）</text>
<text x="40.0" y="1446.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="14" fill="#333" text-anchor="start" font-weight="normal">① t_Xn = 分频比/(边沿系数·f_coil)：PD132T = 16/f、PD136HA = 32/f（随站点变，不是常数）</text>
<text x="40.0" y="1467.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="14" fill="#333" text-anchor="start" font-weight="normal">② Value = Σ(LPCNT 个 Xn) 是箱式积分（计数域降采样）⇒ Δf/f = 表值/65536 精确</text>
<text x="40.0" y="1488.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="14" fill="#333" text-anchor="start" font-weight="normal">③ τ/T = 256/α ⇒ α79 = 3.24 窗、α64 = 4.0 窗（与型号无关）</text>
<text x="40.0" y="1509.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="14" fill="#333" text-anchor="start" font-weight="normal">④ Origin = 块平均（100 / 256 窗），非滑动 ⇒ 基线粒度 = 1 块</text>
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<text x="842.0" y="1422.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="16" fill="#0a58ca" text-anchor="start" font-weight="bold">PD136HA 对照（同站点、同 ÷32）</text>
<text x="842.0" y="1446.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="14" fill="#333" text-anchor="start" font-weight="normal">捕获：320 µs/次（单沿，整周期 32 个线圈周期）；Xn₀ 同为 480 tick</text>
<text x="842.0" y="1467.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="14" fill="#333" text-anchor="start" font-weight="normal">窗：68 × 320 µs = 21.760 ms（标称上限 21.845）</text>
<text x="842.0" y="1488.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="14" fill="#333" text-anchor="start" font-weight="normal">τ(α64) = 87.0 ms = 4.0 窗；Origin = 256 窗 = 5.571 s</text>
<text x="842.0" y="1509.0" font-family="Noto Serif CJK SC, Noto Sans CJK SC, sans-serif" font-size="14" fill="#333" text-anchor="start" font-weight="normal">⇒ 全链时间 ×2（基线 ×5.1）—— 响应更慢但积分深度 ×2</text></svg>
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docs/measurement-window-quantization.md
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---
### 0.1 符号约定（先钉死，避免把曲线画反）
| 环节 | 车辆进入时的方向 |
|---|---|
| 线圈电感 `L` | **↓**（涡流去磁为主；铁磁体不改变结论方向） |
| 谐振频率 `f` | **↑**（`f = 1/(2π√(LC))`）；典型 Δf/f = **+0.02% ~ +1%**，大车/深占压可达 **+5%** |
| 分频后周期 / `Xn`（`∝ 1/f`） | **↓** |
| `Value` / `CAPVD`（`∝ Xn`） | **↓** ⇒ 判据 `CAPVD < Origin − dlt` 取的正是**下降侧** ✓ |
| 测量窗时长（`∝ 1/f`） | **↓**（−0.02% ~ −4.8%） |
与交付报告一致的关系式：`CAPVD ≈ BASE·f₀/f` ⇒ `(Origin − CAPVD)/Origin ≈ Δf/f`（**车辆时 > 0**）✓
⇒ **"深占压"= 频率升高、窗长缩短**；旧稿"频偏 −5% ⇒ 窗 +5.3%"方向写反，2026-09-11 已改正（窗长公式 `∝ f₀/f_now` 本身对两个方向都成立，只是场景标注错了）。
## 1. 代码机理（PD132T / PD136HA 逐行同构）
```c
@@ -173,6 +186,11 @@ Value / Origin = Xn₁ / Xn₀ ← 精确，r₀ 完全约掉 ✓
## 9. 时序链详解：六个量的更新时间（2026-09-11 补，用户提出）
![PD132T 端到端时序图：三段横轴 —— ① 一个窗（0~11.2ms）② 检测到输出（0~600ms）③ 基线块平均（0~12s）](img/timing-chain-pd132t.png)
> 矢量版（可放大/edit）：`docs/img/timing-chain-pd132t.svg`（由 `tools/plot_timing_chain.py` 生成，纯 stdlib 手写 SVG；图中曲线按 §1~§4 公式**真算**而非示意）：
> `python3 tools/plot_timing_chain.py && chromium --headless=new --disable-gpu --no-sandbox --default-background-color=FFFFFFFF --window-size=1680,1560 --screenshot=docs/img/timing-chain-pd132t.png file://$PWD/docs/img/timing-chain-pd132t.svg`
整条链是**三级降采样**：捕获级（每 `Xn` 一次）→ 窗级（每 `LPCNT` 次捕获一次）→ 基线级（每 100/256 窗一次）。
```
docs/pd132t-to-v4b-delivery-alignment.md
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@@ -75,7 +75,7 @@ const uint16_t SensTable_1[4] = { 60, 32, 21, 14}; // 离开：分档与 PD1
净效果：**进入/离开阈值双向对齐后，V4B 因确认机制反而比 PD132T 稳**（代价：进入/释放各慢 ~20~30ms）。
> ⚠ **2026-09-11 勘误**：PD132T 捕获时钟 = **3MHz**（旧稿 0.75MHz 无寄存器依据）⇒ 测量节拍 **10.92ms**（旧 43.7ms）、精确 τ(α79) **29.6ms**（旧口径 142ms）。本节 5 条对比中前两条的「快/密 4.4×」结论作废，改为「同量级」。**阈值/灵敏度口径不受影响**（与时钟无关）。⚠ 另：**测量节拍是区间** —— `LPCNT=⌊32768/Xn₀⌋` 整数除法 + 学习后冻结 ⇒ 标称 10.92ms 为**上限**，实际按站点线圈频率 −0.4%~−6.2%（100kHz 站点 10.88ms），深占压再 +5%；**Δf/f 口径同样不受影响**。详见 `docs/measurement-window-quantization.md`。推导见 `docs/pd136ha-to-dld154v4b-delivery-alignment.md` §2.3。
> ⚠ **2026-09-11 勘误**：PD132T 捕获时钟 = **3MHz**（旧稿 0.75MHz 无寄存器依据）⇒ 测量节拍 **10.92ms**（旧 43.7ms）、精确 τ(α79) **29.6ms**（旧口径 142ms）。本节 5 条对比中前两条的「快/密 4.4×」结论作废，改为「同量级」。**阈值/灵敏度口径不受影响**（与时钟无关）。⚠ 另：**测量节拍是区间** —— `LPCNT=⌊32768/Xn₀⌋` 整数除法 + 学习后冻结 ⇒ 标称 10.92ms 为**上限**，实际按站点线圈频率 −0.4%~−6.2%（100kHz 站点 10.88ms），深占压（Δf/f +5%）窗长 −4.8%；**Δf/f 口径同样不受影响**。详见 `docs/measurement-window-quantization.md`。推导见 `docs/pd136ha-to-dld154v4b-delivery-alignment.md` §2.3。
## 2. 触发/释放手感（存在输出 + 延时模式）
docs/pd132t-vs-pd136ha-comparison.md
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| 2 | 硬件前端 | **完全同构**：线圈 → 9015 PNP×2 振荡 → CD4060 施密特整形 + **÷32（Q5）** → MCU | ✅ |
| 3 | 线圈频段 | **两者覆盖同一频段 ≈23.4~118kHz** —— PD132T 走「3MHz **双沿**捕获（Xn = 半周期）」、PD136HA 走「1.5MHz **单沿**（Xn = 整周期）」，两项差异**恰好互相抵消**：判据常数 `C = 32·f_cap/边沿系数` **同为 4.8×10⁷** ⇒ 这就是两者 Xn 窗口常量几乎逐字相同（406~2050 vs 400~2030）的真正原因 | ⭐ 关键 |
| 4 | 归一化基数 | **同为 32768**（换 MCU 未重定标）⇒ 相对阈值 `表值/65536` 可**直接跨型号对比** | ✅ |
| 5 | 测量节拍 | **10.88ms → 21.76ms**（100kHz 站点实测口径；标称上限 10.923/21.845ms）⇒ 每窗有效平均 1088 → **2176** 个线圈周期（积分深度 ×2）｜⚠ 节拍**是区间**：按站点线圈频率浮动 0 ~ −6.2%，深占压再 +5%（见 `measurement-window-quantization.md`） | ⚖️ 权衡 |
| 5 | 测量节拍（端到端时序图见 `measurement-window-quantization.md` §9） | **10.88ms → 21.76ms**（100kHz 站点实测口径；标称上限 10.923/21.845ms）⇒ 每窗有效平均 1088 → **2176** 个线圈周期（积分深度 ×2）｜⚠ 节拍**是区间**：按站点线圈频率浮动 0 ~ −6.2%，深占压（Δf/f +5%）窗长 −4.8%（见 `measurement-window-quantization.md`） | ⚖️ 权衡 |
| 6 | 滤波 / 基线 | IIR τ：**29.6~38ms → 76~87ms**（慢 2~2.9×）；基线窗 **100 → 256**（1.09s → 5.59s） | ⚠ PD136HA 更稳更慢 |
| 7 | 判据强度 | 两者**均为单次越线判定**（无进入/离开确认计数）—— 响应快、抗单点扰动弱 | ⚖️ 相同 |
| 8 | 灵敏度表 | **重标定**：进入 {300,60,32,21} → {162,81,54,28}。**档位一一照搬会产生 −46%~+69% 偏差** ⇒ 跨代必须按 Δf/f 重新对齐 | ❌ 不可照搬档位 |
docs/pd136ha-to-dld154v4b-delivery-alignment.md
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| PD132L | **1.2MHz** = 12MHz/10 | `TIM1_PSCRL=0x09`（10 分频）+ 外部 12MHz 晶振（`CLK_ECKR`/`CLK_SWR=0xB4`，`CLK_CKDIVR&=0xF8` 无分频） | 27.3 ms |
| PD136HA | **1.5MHz** = XTH(12MHz)/8 ✅**已确认** | `enCntClkDiv = AdtClkPClk0Div8`（PCLK0/8）+ `CLK_INIT()`：`XTH_CR \|= 0x07`（作者注释「**8-16MHZ**，最强驱动」）→ 直取 XTH、**无 PLL / 无 HCLK_PRS·PCLK_PRS 分频** ⇒ PCLK0 = XTH = **12MHz**（**用户确认 2026-09-11：外部晶振也是 12M**）；`Delay_ms` 1330 次/ms 亦印证 ~12MHz | **21.85 ms**（标称上限） |
> ⚠ **测量窗是区间，不是定值（2026-09-11 补，用户提出）**：`LPCNT = ⌊32768/Xn₀⌋` 是**整数除法且学习后冻结**，窗长 = `⌊32768/Xn₀⌋·Xn₁` 个 tick ⇒ 上表「测量窗」列全部为**标称上限**。实际 = 标称 × `(32768−r₀)/32768` × `f₀/f_now`（`r₀ = 32768 mod Xn₀`）：100kHz 站点 **−0.39%**（PD132T 10.88ms / PD136HA 21.76ms）、60kHz 站点 −2.34%、带内最差 **−6.16%**（Xn₀=2050）；深占压（频偏 −5%）再 +5.3%。**Δf/f 口径不受影响**（余数在分子分母约掉，`Value/Origin = Xn₁/Xn₀` 精确）。⚠ 另：`loop1_LPCNT` 为 **`INT8U`** ⇒ 需 `Xn>129`，而 PD136HA 的频率窗口已注释 ⇒ **8 位保护消失**（异常线圈可能报"堵车"而非"故障"）。详见 `docs/measurement-window-quantization.md`。
> ⚠ **测量窗是区间，不是定值（2026-09-11 补，用户提出）**：`LPCNT = ⌊32768/Xn₀⌋` 是**整数除法且学习后冻结**，窗长 = `⌊32768/Xn₀⌋·Xn₁` 个 tick ⇒ 上表「测量窗」列全部为**标称上限**。实际 = 标称 × `(32768−r₀)/32768` × `f₀/f_now`（`r₀ = 32768 mod Xn₀`）：100kHz 站点 **−0.39%**（PD132T 10.88ms / PD136HA 21.76ms）、60kHz 站点 −2.34%、带内最差 **−6.16%**（Xn₀=2050）；深占压（车辆 Δf/f ≈ **+5%**，频率升高）窗长再 **−4.8%**（⚠ 符号见 `measurement-window-quantization.md` §0.1）。**Δf/f 口径不受影响**（余数在分子分母约掉，`Value/Origin = Xn₁/Xn₀` 精确）。⚠ 另：`loop1_LPCNT` 为 **`INT8U`** ⇒ 需 `Xn>129`，而 PD136HA 的频率窗口已注释 ⇒ **8 位保护消失**（异常线圈可能报"堵车"而非"故障"）。详见 `docs/measurement-window-quantization.md`。
>
> ⚠ **本轮勘误**：专项文档 `hardware-loop-frontend-pd132t-vs-v4b.md` 旧记 PD132T 捕获时钟 **0.75MHz / 测量窗 43.7ms ⇒ 修正为 3MHz / 10.92ms**。
> 0.75MHz 系早期误按「T0 走 SYSCLK/4」（旧表写 `12M/4/4`）推算；实配 `AUXR=0xC0`（T0x12=1 → T0 走 SYSCLK/1）⇒ PCA 时钟 = SYSCLK/4 = 3MHz，作者注释 `//溢出供PCA时钟，时钟/4` 亦指此，并被 T1 的 5ms 定时反证（60000 计数 ÷ 5ms = 12MHz = SYSCLK）。