get sales_quote model in sales/Ordercontroller magento backend

get sales_quote model in sales/Ordercontroller magento backend

Hi how to get sales_quote model in ordercontroller magento backend?
i need to get the quote details in the ordercontroller.so, im using the
follwing code.
$quote= Mage::getModel('sales/quote')->load($quoteid);
.Above query returns empty data.
Mage_Sales_Model_Quote Object ( [_eventPrefix:protected] => sales_quote
[_eventObject:protected] => quote [_customer:protected] =>
[_addresses:protected] => [_items:protected] => [_payments:protected] =>
[_errorInfoGroups:protected] => Array ( )
[_preventSaving:protected] =>
[_resourceName:protected] => sales/quote
[_resource:protected] =>
[_resourceCollectionName:protected] => sales/quote_collection
[_cacheTag:protected] =>
[_dataSaveAllowed:protected] => 1
[_isObjectNew:protected] =>
[_data:protected] => Array
(
)
[_hasDataChanges:protected] =>
[_origData:protected] =>
[_idFieldName:protected] =>
[_isDeleted:protected] =>
[_oldFieldsMap:protected] => Array
(
)
[_syncFieldsMap:protected] => Array
(
)
) is there any possiblities to get quote? Help Me..