Development of Electric Engine Cooling Water Pump
Aisin has developed the electric water pump for engine cooling as a pioneer in Japan. It has been necessary to downsize the pump and reduce cost to install the electronically controlled components into the engine. But Aisin has accomplished it with suffic
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Abstract Aisin has developed the electric water pump for engine cooling as a pioneer in Japan. It has been necessary to downsize the pump and reduce cost to install the electronically controlled components into the engine. But Aisin has accomplished it with sufficient reliability for engine installation by developing various ways as follows.
Keywords (Standardized) EV and HV systems Electrical accessories Cooling and temperature management [A3]
1 Preface Now, heightened interest in the environment is ever increasing the need for improvement of vehicle fuel efficiency. Further improvement of fuel efficiency is also required for hybrid engines and all the more necessary for gasoline engines. Against this background, one of the items that contribute to improving fuel efficiency for hybrid engines would be the optimal control over the flow rate of engine cooling water [1]. But, controlling the flow rate of cooling water was difficult because the pumping rates for the conventional mechanical water pumps depended on the engine rpm. F2012-A07-016 A. Saito (&) M. Ishiguro Aisin Seiki Co. Ltd, 2-1 Asahi-machi, Kariya, Aichi 448-8650, Japan e-mail: [email protected]
SAE-China and FISITA (eds.), Proceedings of the FISITA 2012 World Automotive Congress, Lecture Notes in Electrical Engineering 190, DOI: 10.1007/978-3-642-33750-5_32, Springer-Verlag Berlin Heidelberg 2013
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Fig. 1 Structure of electric pump Resin body
High efficiency impeller
Driver Circuit
Sensor-less Brush-less Motor
Our company originally developed electric inverter cooling water pumps; thinking that it was possible to implement an optimal control over the flow rate of cooling water by eliminating such dependency on the engine rpm through electrically-driven operation by adapting those pumps for use with engines, we started to tackle the development of an electric engine cooling water pump. But, if we had tried to secure the maximum discharge flow rate equivalent to those of the conventional mechanical water pumps when developing this electric engine pump, we would have resulted in producing a large frame pump. It would have been inevitable that the result not only would affect its mountability to the limited space within an engine room, but also would bring forth a high-cost electric engine cooling water pump. For this reason, we participated in the engine cooling system working group to consider and implement elements, in cooperation with the other members in the group, such as the reduction of pressure loss in an entire cooling system and optimization of flow rates required for engines and devices, and thereby we could bring forth an electric engine cooling water pump that was low-cost and suitable for controlling hybrid engines.
2 Overview of Electric Engine Cooling Water Pump Figure 1 shows the overview of the electric engine cooling water pump we have developed recently. The structure generally consists of the pump, motor, and driver sections, and the number of parts in the pump and motor
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