Aisin Aw Co., Ltd.

Other

Aisin an Co., Ltd.

Kouji Kobayashi

Nobuaki Miki

Akira Suzuki

Masao Kawai

Shigeo Tsuzuki

Kiyoshi Kurita

Seiji Sakakibara

Yoshinori Matsushita

Toshihiro Shimado

Kenji Itou

A vehicle control unit controls a vehicle having a device capable of controlling deceleration, such as a continuously variable transmission. An information detection device is capable of determining a relationship between the instant vehicle and a preceding vehicle running in front of the instant vehicle, for example, a headway distance and a relative speed therebetween. Based on the information derived from the detection device, the vehicle correlation is determined and compared with a predetermined target correlation. Then, deceleration of the instant vehicle is set by a deceleration setting device such that the determined correlation reaches the predetermined target correlation. The device for performing deceleration is controlled based on the deceleration that has been set.

Vehicle deceleration control unit

A pressure control valve includes pressure modulating section and a magnetic section. The magnetic section has a cylindrical case, a coil assembly, a cylindrical core, a rod and a plunger. Outer limbs of a disc type supporting members which are made of a leaf spring member are fixed to both ends of the cylindrical core, and both ends of the rod are suspended at the center of the disc type supporting members, so that the rod is supported by the disc type supporting members. Due to the above when operation, the move of the rod is performed smoothly by the supporting structure of the disc type supporting member, and the supporting member moves according to the move of the rod, so that such move of the rod brings about no volume change in the magnetic section.

Pressure control valve

A pressure control valve includes pressure modulating section and a magnetic section. The magnetic section has a cylindrical case, a coil assembly, a cylindrical core, a rod and a plunger. The plunger is made of thick magnetic material. At the center of the plunger, a cylindrical concave whose diameter is slightly larger than that of the cylindrical core is provided. The end of the cylindrical core composes an extrusion by extending from the coil assembly. A magnetic attractive section made up by the cylindrical concave of the plunger and the extrusion of the cylindrical core both of which are located vis-a-vis each other, and is located away from the pressure modulating section. Due to the above, when operation the plunger is efficiently magnetized and attracted to the extrusion of the core. And even if fluid leaks from the pressure modulating section, it is difficult for the fluid to reach the magnetic attractive section.

In a solenoid-operated pressure control valve having a pressure modulating section and a magnetic section, the pressure modulating section includes a valve sleeve having an application port, an output port, a feedback port having throttle passage, and a drain port, and a spool being movable in the valve sleeve; and the magnetic section includes a coil assembly and a rod. According to the above structure a force developed from the magnetic section, a force developed by a spring and an output pressure feedback force are applied and balanced, so that an application pressure is so modulated that the application pressure is taken out as an output pressure corresponding to input electric level to the magnetic section. Furthermore, the spool is made to have at least two lands neighboring on each other and to have different diameters, a feedback port which is directly connected to the area between the different diameters is made on the valve sleeve, and the output pressure is so feedbacked that its volume corresponds to the difference of diameters by applying the pressure from the output port.

Solenoid-operated pressure control valve

Growing community of inventors

Toyota, Japan

Kouji Kobayashi