修改问题.md，且新增data_logger.py画图模块

main.py

@@ -15,6 +15,7 @@ import time
 
 import config
 from controllers import IncrementalPID
+from data_logger import FlowRunRecorder
 from flow_control import FlowControlFault, FlowControlLoop
 
 
@@ -131,6 +132,7 @@ def run(target_flow_slm):
     controller.set_target_flow(target_flow_slm)
 
     connected = False
+    recorder = None
     exit_code = 0
     try:
         logger.info(
@@ -161,6 +163,11 @@ def run(target_flow_slm):
             )
 
         controller.start(initial_opening=0.0)
+        recorder = FlowRunRecorder(
+            Path(__file__).resolve().parent / config.DATA_DIRECTORY,
+            plot_dpi=config.PLOT_DPI,
+        )
+        logger.info("逐周期数据将保存到 %s", recorder.csv_path)
         logger.info("闭环控制已启动；按 Ctrl+C 停止")
 
         next_deadline = time.perf_counter()
@@ -168,6 +175,7 @@ def run(target_flow_slm):
         while True:
             now = time.perf_counter()
             result = controller.step(now=now)
+            recorder.record(result)
 
             if now >= next_status_time or result.status != "OK":
                 logger.info(format_status(result))
@@ -200,6 +208,19 @@ def run(target_flow_slm):
             except Exception:
                 exit_code = max(exit_code, 5)
                 logger.exception("断开 MT2-AM8 时发生异常")
+
+        if recorder is not None:
+            try:
+                image_path = recorder.finalize()
+                logger.info("控制数据已保存：%s", recorder.csv_path)
+                if image_path is not None:
+                    logger.info("三联曲线图已保存：%s", image_path)
+                else:
+                    logger.warning("本次运行没有采样点，因此未生成曲线图")
+            except Exception:
+                recorder.close()
+                exit_code = max(exit_code, 7)
+                logger.exception("保存控制数据曲线图失败；CSV 数据仍保留")
         logger.info("程序结束，退出码=%d", exit_code)
     return exit_code