select 
    *
from 
    tbl_log a
where 
    tl_time=(select max(tl_time) from tbl_log where tl_car=a.tl_car and tl_car in(441,442))

------解决方案--------------------
your query looks ok. To write a procedure without setting a fixed list of ids, you can do something like this:

SQL code
create proc getRecentRec(@idList nvarchar(1000))
AS
Begin
    if charindex(',', @idList)>0 -- a list
    Begin
        declare @sql nvarchar(1000)
        set @sql = 
            'select * from tbl_log t
            where tl_car in (' + @idList + ')
            AND tl_time = (select max(tl_time) from tbl_log where tl_car = t.tl_car)'
        exec(@sql)
    End
else
    Begin
        select * from tbl_log t
        where tl_car = @idList And tl_time = (select max(tl_time) from tbl_log where tl_car = t.tl_car)
    End
End

------解决方案--------------------
SQL code
--静态——固定两个：tl_car in (441,442)
select * from tbl_log a where tl_car in (441,442) and tl_time=(select max(tl_time) from tbl_log where tl_car=a.tl_car)

--动态SQL查多个tl_car：
declare @tl_cars varchar(1000)
set @tl_cars='441,443,446,447'
exec ('select * from tbl_log a where tl_car in ('+@tl_cars+') and tl_time=(select max(tl_time) from tbl_log where tl_car=a.tl_car)')