From bcc1dc50292f65fc958f56df0c0558e301175189 Mon Sep 17 00:00:00 2001
From: Stanley Huang <stanleyhuangyc@gmail.com>
Date: Sat, 2 Apr 2016 10:02:21 +1100
Subject: Added definition for Fuel–Air commanded equivalence ratio
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---
libraries/OBD/OBD.cpp | 9 ++++++---
libraries/OBD/OBD.h | 1 +
2 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/libraries/OBD/OBD.cpp b/libraries/OBD/OBD.cpp
index 6ede386..2499500 100644
--- a/libraries/OBD/OBD.cpp
+++ b/libraries/OBD/OBD.cpp
@@ -117,10 +117,10 @@ int COBD::normalizeData(byte pid, char* data)
int result;
switch (pid) {
case PID_RPM:
- case PID_EVAP_SYS_VAPOR_PRESSURE:
+ case PID_EVAP_SYS_VAPOR_PRESSURE: // kPa
result = getLargeValue(data) >> 2;
break;
- case PID_FUEL_PRESSURE:
+ case PID_FUEL_PRESSURE: // kPa
result = getSmallValue(data) * 3;
break;
case PID_COOLANT_TEMP:
@@ -146,7 +146,7 @@ int COBD::normalizeData(byte pid, char* data)
case PID_HYBRID_BATTERY_PERCENTAGE:
result = getPercentageValue(data);
break;
- case PID_MAF_FLOW:
+ case PID_MAF_FLOW: // grams/sec
result = getLargeValue(data) / 100;
break;
case PID_TIMING_ADVANCE:
@@ -187,6 +187,9 @@ int COBD::normalizeData(byte pid, char* data)
case PID_CATALYST_TEMP_B2S2:
result = getLargeValue(data) / 10 - 40;
break;
+ case PID_AIR_FUEL_EQUIV_RATIO: // 0~200
+ result = (long)getLargeValue(data) * 200 / 65536;
+ break;
default:
result = getSmallValue(data);
}
diff --git a/libraries/OBD/OBD.h b/libraries/OBD/OBD.h
index c42b450..ba10631 100644
--- a/libraries/OBD/OBD.h
+++ b/libraries/OBD/OBD.h
@@ -55,6 +55,7 @@
#define PID_CATALYST_TEMP_B2S2 0x3F
#define PID_CONTROL_MODULE_VOLTAGE 0x42
#define PID_ABSOLUTE_ENGINE_LOAD 0x43
+#define PID_AIR_FUEL_EQUIV_RATIO 0x44
#define PID_RELATIVE_THROTTLE_POS 0x45
#define PID_AMBIENT_TEMP 0x46
#define PID_ABSOLUTE_THROTTLE_POS_B 0x47
--
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