AC delay (#4502)

* AC delay

* changelog

firmware/CHANGELOG.md

@@ -29,6 +29,7 @@ Release template (copy/paste this for new release):
  - Time delay before DFCO #4292
  - Idle coasting position table is now RPM-based, instead of CLT-based #4487
  - Manual electronic throttle synchronization #3680
+ - Delay before enabling AC compressor #4502
 
 ### Fixed
  - Inverted vvt control #4464

firmware/controllers/actuators/ac_control.cpp

@@ -58,7 +58,20 @@ void AcController::onSlowCallback() {
 
 	m_acEnabled = isEnabled;
 
-	enginePins.acRelay.setValue(isEnabled);
+	if (!isEnabled) {
+		// reset the timer if AC is off
+		m_timeSinceNoAc.reset();
+	}
+
+	float acDelay = engineConfiguration->acDelay;
+	if (acDelay == 0) {
+		// Without delay configured, enable immediately
+		acCompressorState = isEnabled;
+	} else {
+		acCompressorState = isEnabled && m_timeSinceNoAc.hasElapsedSec(acDelay);
+	}
+
+	enginePins.acRelay.setValue(acCompressorState);
 }
 
 bool AcController::isAcEnabled() const {

firmware/controllers/actuators/ac_control.h

@@ -11,4 +11,5 @@ public:
 private:
 	bool getAcState();
 
+	Timer m_timeSinceNoAc;
 };

firmware/controllers/actuators/ac_control.txt

@@ -11,6 +11,7 @@ bit noClt;AC no CLT
 bit engineTooHot;AC engine too hot
 bit tpsTooHigh;AC tps too high
 bit isDisabledByLua;AC disabled by Lua
+bit acCompressorState;AC compressor on
 
 int latest_usage_ac_control;AC latest activity
 ! todo: extract some helper which would contain boolean state and most recent toggle time?

firmware/integration/rusefi_config.txt

@@ -1430,8 +1430,9 @@ tChargeMode_e tChargeMode;
 	uint8_t autoscale maxCamPhaseResolveRpm;Below this RPM, use camshaft information to synchronize the crank's position for full sequential operation. Use this if your cam sensor does weird things at high RPM. Set to 0 to disable, and always use cam to help sync crank.;"rpm", 50, 0, 0, 12500, 0
 
 	uint8_t autoscale dfcoDelay;Delay before cutting fuel. Set to 0 to cut immediately with no delay. May cause rumbles and pops out of your exhaust...;"sec", 0.1, 0, 0, 10, 1
+	uint8_t autoscale acDelay;Delay before engaging the AC compressor. Set to 0 to engage immediately with no delay. Use this to prevent bogging at idle when AC engages.;"sec", 0.1, 0, 0, 10, 1
 
-	int8_t[10] unused4080;;"", 1, 0, 0, 0, 0
+	int8_t[9] unused4080;;"", 1, 0, 0, 0, 0
 
 ! Someday there will be a 6th option for BMW S55 that uses a separate shaft just for HPFP
 #define hpfp_cam_e_enum "NONE", "Intake 1", "Exhaust 1", "Intake 2", "Exhaust 2"

firmware/tunerstudio/rusefi.input

@@ -2948,6 +2948,7 @@ cmd_set_engine_type_default					= "@@TS_IO_TEST_COMMAND_char@@\x00\x31\x00\x00"
 		field = "A/C switch mode",					acSwitchMode
 		field = "A/C Relay",						acRelayPin
 		field = "A/C Relay Mode",					acRelayPinMode
+		field = "A/C compressor delay",			acDelay
 		field = "Max RPM",						maxAcRpm
 		field = "Max CLT",						maxAcClt
 		field = "Max TPS",						maxAcTps