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    Lean Six Sigma Project

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    Honda Civic Hybrid Hypothesis
    Honda has history of environmental leadership and the company has carried its tradition
    along by getting recognized as country's greenest automaker by the Union of
    Concerned Scientists (UCS). The Honda's most innovative offering has been with Civic
    Hybrid. The company boasts of providing advantage of all the gas-saving technology in
    the new Civic Hybrid and an estimated mileage one can get on the highway is 44 mpg.
    The vehicle comes with a quick and easy way to boost efficiency in the form of the
    ECON button. When the button is pushed, the engine and other power-using system go
    into super-efficient mode to maximize the mileage.
    However, not all customers would agree to the mileage provided by Honda for its Civic
    Hybrid. Many of them believe that the mileage is quite disappointing which might be due
    to some manufacturing quality issue with the Honda Civic Hybrid (HCH) and particularly
    the CVT that is causing high rate of low mileage experiences when compared with other
    make and model hybrids. A step further in this analysis can be that there might be
    design issues in the HCH with respect to keeping batteries cool. A direct comparison of
    this point can be had with diesel-electric-hybrid buses where the biggest issue for
    performance of the hybrid drive on the vehicles which have been tested is temperature
    control. If batteries get too hot, they do not recharge and the bus runs effectively on
    diesel alone. In fact, some of the buses tested had worse mileage than conventional
    models running on the same route.
    Hence, from the above analysis, we can form a hypothesis for Honda Civic Hybrid
    which is:
    H0: The temperature of the city in which HCH is driven has direct impact on the mileage
    of the vehicle.

    Data Collection

    To validate the hypothesis we would need to collect data related to average
    temperature and humidity level of different sample cities along with humidity range for
    the average mileage reported by HCH users in these cities. The data would have to be
    collected for a particular month but cities would be chosen in such a way that there is
    variation in the weather conditions among them. Hence, for a selected sample of 5
    different cities we would have the data for a month for temperature and humidity and
    mileage. For each sample we can calculate the mean mileage. Using ANOVA we would

    be able to determine if there is a statistical difference among this data across different
    cities. Through the ANOVA test we would also get to know whether or not the means of
    several groups are equal.

    Data Analysis

    The total variation is comprised of the sum of the squares of difference of each mean
    with the grand mean (total of all data values divided by the total sample size). There is a
    between group variation and within group variation. The whole idea behind the analysis
    of variance is to compare the ratio of between group variance to within group variance.
    These variations are denoted by Sum of Squares Between Groups SS (B) and Mean
    Square Between Groups MS (B). Similarly, SS (W) and MS (W) is the within group data.
    Using this data we can calculate the Mean Square and find the F-value which is the
    ratio of mean squares. If the between variance is smaller than the within variance, then
    the means are really close to each other and we will fail to reject the claim that they are
    all equal.

    Hence if means are equal we would fail to reject the hypothesis that gas mileage is
    affected by the external temperature and conclude that there is an effect of external
    temperature on the mileage of the hybrid car.
    If one of the means is different we would reject the null, and conclude that there is no
    interdependence of external temperature and mileage of the vehicle.

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    Solution Preview

    Honda Civic Hybrid: Regression analysis
    Situation
    According to a research, there is a finding that 2006-2008 Civic Hybrid models are suffering an abnormally high rate of battery failure at relatively low miles. The batteries are evidently prematurely losing their charge particularly in hot areas in Arizona and when used in a lot of stop-and-go traffic. The battery pack has a high charge cycling rate when the car models spend a lot of time during hot weather use with the AC on. As a result the battery suddenly drops to no or one bar and stops providing any assistance and doesn't even charge properly.
    Regression Case
    The problem faced by several Honda Civic Hybrid regarding the battery life can form a regression case for us. We can form a regression equation to study if there exists any relationship between the ...

    Solution Summary

    The lean six sigma projects are examined for Honda Civic.

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