A lubrication control device of in-wheel motor units for a vehicle which is used in an in-wheel motor drive vehicle which can run by driving at least a pair of left and right wheels by the respective in-wheel motor units, the lubrication control device being arranged to lubricate insides of the pair
A lubrication control device of in-wheel motor units for a vehicle which is used in an in-wheel motor drive vehicle which can run by driving at least a pair of left and right wheels by the respective in-wheel motor units, the lubrication control device being arranged to lubricate insides of the pair of left and right in-wheel motor units, by an oil pumped from lower portions within cases of the in-wheel motor units by respective oil pumps, the lubrication control device includes: an oil pump drive control section configured to control and drive the oil pumps so that oil levels of the lower portions within the cases of the left and right in-wheel motor units are the same by oil pumping amounts from the oil pumps.
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1. A lubrication control device of in-wheel motor units for an in-wheel motor drive vehicle that can run by driving at least a pair of left and right wheels by respective in-wheel motor units of a pair of left and right in-wheel motor units, wherein: the lubrication control device is arranged to con
1. A lubrication control device of in-wheel motor units for an in-wheel motor drive vehicle that can run by driving at least a pair of left and right wheels by respective in-wheel motor units of a pair of left and right in-wheel motor units, wherein: the lubrication control device is arranged to control lubrication within the pair of left and right in-wheel motor units, by oil pumped from lower portions within cases of the in-wheel motor units by respective oil pumps, andthe lubrication control device comprises a controller including an oil pump drive control section configured to control and drive the oil pumps so that oil levels of the lower portions within the cases of the left and right in-wheel motor units are the same, by controlling oil pumping amounts from the oil pumps,wherein the oil pump drive control section is configured to control and drive the oil pumps in a high vehicle speed region such that the oil pumping amounts from the oil pumps are maintained to a constant amount, by which the oil levels of the lower portions within the cases of the left and right in-wheel motor units are the same,wherein oil of the same oil level is stored, respectively, in the lower portions within the cases of the left and right in-wheel motor units,wherein the oil pump drive control section is configured to control and drive the oil pumps in the high vehicle speed region based on a temperature of the oil, so that the oil pumping amounts are maintained to the constant amount, andwherein, in a low vehicle speed region which is lower than the high vehicle speed region, the oil pump drive control section is configured to control starting of the oil pumps based on at least a running distance, the running distance being a distance which the vehicle has traveled while the oil pumps are in a stop state. 2. The lubrication control device of the in-wheel motor units for the vehicle as claimed in claim 1, wherein the constant amount is a minimum amount of oil necessary to lubricate the in-wheel motor units. 3. The lubrication control device of the in-wheel motor units for the vehicle as claimed in claim 1, wherein: the oil pumps are a pair of left and right oil pumps, andthe oil pump drive control section is configured to drive and control the oil pumps so that the oil pumping amounts by the pair of the left and right oil pumps become the same. 4. The lubrication control device of the in-wheel motor units for the vehicle as claimed in claim 1, wherein, in the high vehicle speed region, stirring resistances by the oil of the lower portions within the cases of the in-wheel motor units exceed a permission level. 5. The lubrication control device of the in-wheel motor units for the vehicle as claimed in claim 4, wherein the oil pump drive control section is configured to drive and control the oil pumps so that the oil pumping amounts are constant in the high vehicle speed region, and, in the low vehicle speed region that is lower than the high vehicle speed region, the oil pumping amounts become smaller than the constant amount. 6. The lubrication control device of the in-wheel motor units for the vehicle as claimed in claim 5, wherein the oil pump drive control section is configured to control and drive the oil pumps so that the oil pumping amounts become smaller in the low vehicle speed region as the vehicle speed becomes lower. 7. The lubrication control device of the in-wheel motor units for the vehicle as claimed in claim 1, wherein the oil pump drive control section drives and controls the oil pumps so that the oil pumping amounts from the oil pumps are gradually increased as the vehicle speed is increased in the low vehicle speed region which is smaller than a set vehicle speed at which stirring resistances by the oil of the lower portions within the cases of the in-wheel motor units do not exceed a permission level, and drives and controls the oil pumps as the vehicle speed increases to the set vehicle speed so that the oil pumping amounts become a predetermined amount by which the oil levels of the lower portions within the cases of the left and right in-wheel motor units are the same. 8. The lubrication control device of the in-wheel motor units for the vehicle as claimed in claim 7, wherein the oil pump drive control section is configured to drive and control the oil pumps in the high vehicle speed region, which is equal to or greater than the set vehicle speed, such that the oil pumping amounts from the oil pumps are maintained to the predetermined amount. 9. The lubrication control device of the in-wheel motor units for the vehicle as claimed in claim 7, wherein the predetermined amount is a minimum oil amount to lubricate the in-wheel motor units. 10. A lubrication control device of in-wheel motor units for an in-wheel motor drive vehicle that can run by driving at least a pair of left and right wheels by respective in-wheel motor units of a pair of left and right in-wheel motor units, wherein: the lubrication control device is arranged to control lubrication within the pair of left and right in-wheel motor units, by oil pumped from lower portions within cases of the in-wheel motor units by respective oil pumps, andthe lubrication control device comprises a controller including an oil pump drive control section configured to control and drive the oil pumps so that oil levels of the lower portions within the cases of the left and right in-wheel motor units are the same, by controlling oil pumping amounts from the oil pumps,wherein the oil pump drive control section is configured to control and drive the oil pumps in a high vehicle speed region such that the oil pumping amounts from the oil pumps are maintained to a constant amount, by which the oil levels of the lower portions within the cases of the left and right in-wheel motor units are the same,wherein oil of the same oil level is stored, respectively, in the lower portions within the cases of the left and right in-wheel motor units,wherein the oil pump drive control section is configured to control and drive the oil pumps in the high vehicle speed region based on a temperature of the oil, so that the oil pumping amounts are maintained to the constant amount,wherein the oil pump drive control section is configured to control and drive the oil pumps during an entirety of the high vehicle speed region, andwherein the high vehicle speed region is a region in which the speed of the vehicle is a predetermined speed or more, and the oil pumps are driven during the entirety of the high vehicle speed region at all temperatures of the oil in the high vehicle speed region.
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이 특허에 인용된 특허 (2)
Barrie Woodrow L. (Clarkston MI) Lemieux George E. (Livonia MI), Lubrication and cooling system for a powertrain including an electric motor.
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