Aim LCU-ONE CAN User manual

User Manual
LCU-One CAN for MyChron5
Release 1.00

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INDEX
1 – LCU-One CAN in few words 3
2 – The kit contains 3
3 – What is lambda 4
3.1 – Rich mixture 4
3.2 – Lean mixture 4
3.3 – Stoichiometric mixture 4
3.4 – Bosch LSU 4.9 probe working 5
4 – Powering LCU-One CAN controller 6
5 – Installing the probe and LCU-One CAN lambda controller 7
6 – LCU-One CAN and MyChron5 9
6.1 – AiM Network 9
6.2 – Showing LCU-One CAN values on MyChron5 10
6.3 – Configuration issues 12
7 – How to analyse LCU-One CAN data 13
8 – Technical drawings and specifications 14

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1 – LCU-One CAN in few words
LCU-One CAN is the lambda controller unit designed to work exclusively with Bosch LSU 4.9 wideband probes, which are the quickest
and most accurate way to analyse exhaust gases and provide a real time parameter related to engine carburetion.
Lambda probes can be applied to 2 and 4 strokes engines, gasoline, diesel, methane or alcohol based fuels.
LCU-One CAN communicates with MyChron5 via CAN, providing lambda value, Air/Fuel ratio, probe temperature and diagnostics
parameters.
An external 12V battery is required, this will supply power to the whole AiM system, including MyChron5 and any other AiM expansion
connected to it. LCU-One CAN is the only AiM Lambda Controller compatible with MyChron5.
2 – The kit contains
The kit contains:
•LCU-One Lambda controller (1)
•Bosch LSU 4.9 wide band probe (2)
•Weld on bung (3)
The kit part number is: X08LCU05CAN
Bosch probe and bung can be bought separately as spare parts with these part numbers:
•LSU Bosch 4.9 probe X05LSU490
•Weld on bung LBS552680

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3 – What is lambda
Lambda represents the ratio between actual mixture of air/fuel (A/F or AFR) admitted in the engine, compared to the optimum ratio (A/F
or AFR stoichiometric) indicating an efficient fuel combustion. Lambda can be written as:
where:
A= parts of air (oxygen) in the combustion chamber
F= parts of fuel in the combustion chamber
To completely burn one part of gasoline, 14.57 parts of air (AFRstoichiometric) are required.
This optimal combustion is also indicated as Lambda = 1 whatever is the fuel in use.
AFRstoichiometric is a fuel dependant constant. Oxygenated fuels and additives will change this value, thus it is strongly recommended to
use Lambda as reference parameter.
3.1 – Rich mixture
If the actual mixture has less than 14.57 air parts to 1 part of gasoline, the mixture is said rich. For example an AFR of 12.2 is a rich mixture
and is also indicated as:
84.0
57.14
2.12 ==Lambda
Lambda < 1
AFR < 14.57 (for gasoline)
3.2 – Lean mixture
If the actual mixture has more than 14.57 air parts to 1 part of gasoline, the mixture is said lean. For example an AFR of 17.5 is a lean
mixture and is also indicated as:
2.1
57.14
5.17 ==Lambda
Lambda > 1
AFR > 14.57 (for gasoline)
3.3 – Stoichiometric mixture
If the actual mixture has 14.57 air parts to 1 part of gasoline, the mixture is in the stoichiometric ratio.
This is also indicated as Lambda = 1

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3.4 – Bosch LSU 4.9 probe working
Bosch LSU 4.9 is a wideband lambda probe which does not require any specific calibration procedure, it auto-calibrates on a reference
electrical current which guarantees the same performance over time.
When in use the probe becomes very hot (700-800 °C or 1291-1472 °F), so do not touch it or place it in contact with inflammable
material or fuel.
Warning: misuse can cause shocks, burnings or explosions.
Do not clean the probe with solvents or additives, we suggest to remove it when cleaning the kart to avoid detergent pollution.
Never switch the engine on if the probe is installed but not connected to a working controller LCU-One CAN. If a probe were to be
exposed to exhaust gas when not heated it would be permanently damaged. Wait for the probe to be ready, you will read the following
values on the dash (Lambda = 1.6 AFR = 23.31) depending on your display set up.
•during warmup – left image below – Lambda value is 1 (14.56 AFR)
•when the probe is working – right image below – Lambda value with the engine off is 1.60 (free air) (23.31 AFR).
The Bosch LSU 4.9 detects Lambda values in a 0.65 – 1.6 range (9.5 – 23.3 AFR).

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4 – Powering LCU-One CAN controller
The wideband Lambda probe has a working temperature of about 780°C (1436°F); for this reason it is constantly monitored by the
Lambda controller LCU-One CAN which tunes the power supplied by an external 12V battery.
The warm up can drain up to 1.6A while the average consumption is approximately 1A, thus it is recommended to install a battery which
can last several hours feeding the whole logging system. To make an example a 4 cells LiPo battery with a capacity of 3000mAh can
guarantee 3 hours of activity.
LCU-One CAN controller has to be connected directly to the external 12V battery, using the three leads (one red and two black) supplied
with spade connectors.
They all have to be correctly connected with no dispersions, bad crimping, oxide or thin section wires causing an inadequate current
supply to warm the Lambda probe. These are the most common causes of a bad reading and premature poisoning of Lambda probes.
The controller also powers MyChron5 and switches off with it avoiding battery discharge.

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5 – Installing the probe and LCU-One CAN lambda controller
Bosch LSU 4.9 Lambda probe must be installed on the kart exhaust pipe, welding the bung supplied with the kit on it. Install the probe
close to the engine, avoiding its cable to be in contact with heat sources and the pipe.
The probe working temperature must not exceed 900°C (1652°F) nor be exposed to the free flame coming out of the engine port.
Suitable positions to install it are in the silencer flexible pipe, the diffuser cone or on top of the expansion. Do not place the probe at the
end of the exhaust pipe or too far from the piston.
The probe installation angle should be no less than 10 degrees, as in the image below, to avoid that condensation come in contact with
the probe, polluting it. Leaning it towards the driver can possibly save it from rear collisions.

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It is suggested to install LCU-One CAN under the Nassau panel.
•make the power (1) and probe (2) cables pass around the steering wheel hoop
•fix the probe cable to the kart seat.

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6 – LCU-One CAN and MyChron5
The LCU-One CAN is totally integrated with MyChron5; its connection to the AiM CAN network and the display setup allows to have
everything under control on MyChron5 display.
6.1 – AiM Network
You can connect LCU-One CAN directly to MyChron5 “Exp” connector or add it to an extended network as shown here below.
Please note: all devices are to be connected when switched off. MyChron5 automatically detects LCU-One CAN and all other expansions
at start up.

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6.2 – Showing LCU-One CAN values on MyChron5
To show LCU-One CAN data on MyChron5, set its Display Setup as described below:
•press “MENU/>>”
•select “System settings” icon and press “ENTER”
•
select “Display Setup” icon and press “ENTER”
•scroll the pages up to the first custom page and press
“NEXT” to switch to the bottom row
•if the page is not enabled press “CHANGE” and enable it
•press “CONFIG”
•the page shows four fields all set as “NONE” with the first top
left already selected;
•press “SELECT”

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Using “PREV” and “NEXT” buttons scroll the list of available data;
LCU-One CAN parameters you can display are:
•Lambda Val: oxygen/exhaust gas ratio – reference value is
1.00
•Lambda AFR: lambda value times stoichiometric value of
fuel in use (gasoline stoichiometric value is 14.57)
•Lambda Temp: probe internal temperature
Select the data you want to see and press “SELECT”; repeat the
operation for the three fields
•
data are labelled as shown here on the right:
oLambda Temp: LmdT
oLambda Val: Lmd
oLambda AFR: AFR
•press “EXIT” until you come back to MyChron5 main page.
•
To see sampled data in real time press “ON/VIEW” until you
see the custom page set.

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6.3 – Configuration issues
If when you try to configure MyChron 5 display you do not see Lambda channels among those available, you probably only need to wait
some time for the full recognition.
To verify that MyChron5 detects LCU-One CAN:
•press “MENU/<<”
•select “System Settings” icon and press “ENTER”
•select “System Information” icon (the last one) and press
“ENTER”; the page shows the bottom line “Net Info”
selected: press “ENTER”.
•
the system shows information about all devices connected
to MyChron5, LCU-One CAN included.
If LCU-One is not shown, cycle MyChron5 power and wait. Please remember that all devices have to be connected to MyChron5 when
everything is off.

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7 – How to analyse LCU-One CAN data
Once the session is over and data have been downloaded from MyChron5 you can analyse them using Race Studio Analysis software.
Running the software and opening the test you will see that LCU-One CAN
connection adds four channels to “Measures and laps” bar (image on the
right):
•Lambda Val: shows Lambda value recorded during the test
•Lambda AFR: shows lambda value times the stoichiometric value of the
fuel in use
•Lambda_Temp: shows the working probe internal temperature
•Lambda Diagn: shows the probe status; values that can be shown are:
o0 = ok
o1 = probe disconnected from controller and circuit open
o2 = 12V short circuit
o3 = GND short circuit
Documents and tutorials relevant to LCU-One and Lambda analysis are available at:
www.aim-sportline.com – Documentation area – On-Track sessions.

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8 – Technical drawings and specifications
•Dimensions 87,6x39x15.5 mm [3.44x0.53x0.61 inches]
•Waterproof IP67

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Our website www.aim-sportline.com is constantly updated. Please refer to it for updates on firmware, software and documentation.