only:Some sort of AFR smoothing for some reason #6579

firmware/CHANGELOG.md

@@ -37,6 +37,7 @@ Release template (copy/paste this for new release):
  - Allow to choose lower RPM cutoff for AC Compressor #6597
  - New TPS/TPS enrichment mode: percent adder #3167
  - Launch control has a variable ignition cut BEFORE the main Hard cut #6566
+ - Experimental mapExpAverageAlpha filtering #6579
 
 ### Fixed
  - knock logic not activated until any configuration change via TS #6462

firmware/controllers/engine_controller.cpp

@@ -546,6 +546,9 @@ bool validateConfigOnStartUpOrBurn() {
     criticalError("Invalid adcVcc: %f", engineConfiguration->adcVcc);
 		return false;
 	}
+	if (engineConfiguration->mapExpAverageAlpha <= 0 || engineConfiguration->mapExpAverageAlpha > 1) {
+	  engineConfiguration->mapExpAverageAlpha = 1;
+	}
 
 	ensureArrayIsAscending("Batt Lag", engineConfiguration->injector.battLagCorrBins);
 

firmware/controllers/engine_cycle/map_averaging.cpp

@@ -97,6 +97,17 @@ SensorResult MapAverager::submit(float volts) {
 	return result;
 }
 
+PUBLIC_API_WEAK float filterMapValue(float value) {
+  static float state = 0;
+  if (state == 0) {
+    state = value;
+    return value;
+  }
+  float result = state + engineConfiguration->mapExpAverageAlpha * (value - state);
+  state = result;
+  return result;
+}
+
 void MapAverager::stop() {
 	chibios_rt::CriticalSectionLocker csl;
 
@@ -117,7 +128,7 @@ void MapAverager::stop() {
 				minPressure = averagedMapRunningBuffer[i];
 		}
 
-		setValidValue(minPressure, getTimeNowNt());
+		setValidValue(filterMapValue(minPressure), getTimeNowNt());
 	} else {
 #if EFI_PROD_CODE
 		warning(ObdCode::CUSTOM_UNEXPECTED_MAP_VALUE, "No MAP values to average");

firmware/integration/rusefi_config.txt

@@ -988,7 +988,7 @@ bit verboseCan2,"Print all","Do not print";Print incoming and outgoing second bu
     int launchSpeedThreshold;Launch disabled above this speed if setting is above zero;"Kph", 1, 0, 0, 300, 0
     int launchRpmWindow;Starting Launch RPM window to activate (subtracts from Launch RPM);"RPM", 1, 0, 0, 8000, 0
     float triggerEventsTimeoutMs;;"ms", 1, 0, 0, 3000, 3
-    int unusedHere13
+    float mapExpAverageAlpha;;"", 1, 0, 0, 3000, 3
 	float magicNumberAvailableForDevTricks
 	float turbochargerFilter
 	int launchTpsThreshold;;"", 1, 0, 0, 20000, 0

firmware/tunerstudio/tunerstudio.template.ini

@@ -3444,6 +3444,7 @@ cmd_set_engine_type_default					= "@@TS_IO_TEST_COMMAND_char@@@@ts_command_e_TS_
 		field = ""
 		field = "Measure Map Only In One Cylinder",		measureMapOnlyInOneCylinder
 		field = "Cylinder count to sample MAP",					mapMinBufferLength
+    field = mapExpAverageAlpha, mapExpAverageAlpha
 
 	dialog = mapSettings, "", yAxis
 		panel = mapCommon

unit_tests/tests/util/test_averaging.cpp

@@ -0,0 +1,17 @@
+#include "pch.h"
+
+extern float filterMapValue(float value);
+
+TEST(average, exp) {
+  EngineTestHelper eth(engine_type_e::TEST_ENGINE);
+  ASSERT_EQ(filterMapValue(0), 0);
+
+  engineConfiguration->mapExpAverageAlpha = 0.5;
+
+
+  ASSERT_EQ(filterMapValue(3), 3);	// this would start collecting
+  ASSERT_EQ(filterMapValue(1), 2);
+  ASSERT_EQ(filterMapValue(3), 2.5);
+
+
+}

unit_tests/tests/util/test_util.mk

@@ -7,6 +7,7 @@ CPPSRC += 	$(PROJECT_DIR)/../unit_tests/tests/util/test_buffered_writer.cpp \
 	$(PROJECT_DIR)/../unit_tests/tests/util/test_closed_loop_controller.cpp \
 	$(PROJECT_DIR)/../unit_tests/tests/util/test_scaled_channel.cpp \
 	$(PROJECT_DIR)/../unit_tests/tests/util/test_timer.cpp \
+	$(PROJECT_DIR)/../unit_tests/tests/util/test_averaging.cpp \
 	$(PROJECT_DIR)/../unit_tests/tests/util/test_lua_biquad.cpp \
 	$(PROJECT_DIR)/../unit_tests/tests/util/test_hash.cpp \