Claims:1. A controller (110) to determine chain tension in a drivetrain of a vehicle
(102), characterized in that, said controller (110) adapted to,
monitor engine speed from a signal received from an engine speed
5 sensor (104),
detect at least one Region of Interest (ROI), in said monitored engine
speed, said at least one ROI comprises engine speed increasing from
a minimum value to a maximum value,
compute a first parameter and a second parameter based on said
10 monitored engine speed corresponding to said at least one ROI, and
determine said chain tension based on said computed first parameter
and said second parameter.
2. The controller (110) as claimed in claim 1, wherein said determination of
15 said chain tension is triggered after detection of a tip out condition, wherein
said tip out condition is ascertained from signals received from a throttle
position sensor (106).
3. The controller (110) as claimed in claim 1, wherein said first parameter
20 comprises duration of increase of engine speed in said at least one ROI from
said minimum value to said maximum value.
4. The controller (110) as claimed in claim 1, wherein said second parameter
comprises time period of one rotation of crankshaft of said engine (112) at
beginning of said at least one ROI.
5. The controller (110) as claimed in claim 1, wherein said controller (110)
calculates a ratio of said first parameter and said second parameter, named
as rise ratio, and determines chain tension based on any one of a table, a
30 map and a classification module stored in a memory element (124).
6. A method for determining chain tension in a drivetrain of a vehicle (102),
characterized by, said method comprises the steps of:
monitoring engine speed from a signal received from an engine
speed sensor (104),
detecting at least one Region of Interest (ROI), 5 in said monitored
engine speed, said at least one ROI comprises engine speed
increasing from a minimum value to a maximum value,
computing a first parameter and a second parameter based on said
monitored engine speed corresponding to said at least one ROI, and
10 determining said chain tension based on said computed first
parameter and said second parameter.
7. The method as claimed in claim 6, wherein determining of said chain
tension is initiated after detecting a tip out of a throttle, wherein said tip out
15 condition is ascertained from signals received from a throttle position sensor
(106).
8. The method as claimed in claim 6, wherein said first parameter comprises
duration of increase of engine speed in said at least one ROI from said
20 minimum value to said maximum value.
9. The method as claimed in claim 6, wherein said second parameter comprises
time period of one rotation of crankshaft of said engine (112) at beginning
of said at least one ROI.
25
10. The method as claimed in claim 6, wherein said controller (110) calculates
a ratio of said first parameter and said second parameter, named as rise ratio,
and determines chain tension based on said rise ratio by any one of a table
and a classification module stored in a memory element (124). , Description:The system 100 comprises a vehicle 102 with the controller 110. The controller 110
is expanded for clarity. The controller 110 adapted to monitor engine speed from a
signal received from an engine speed sensor 104, detect at least one Region of
Interest (ROI), in the monitored engine speed, the at least one ROI comprises engine
speed increasing from a minimum value to a maximum value, compute a first
parameter and a second parameter based on the monitored engine speed
corresponding to the at least one ROI, and determine the chain tension based on the
computed first parameter and the second parameter. The controller 110 indicates to
the user that their vehicle’s chain 120 has excessive slack. The solution does not
make use of any additional sensor in the vehicle 102.