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1. 发明专利

JPH0771584A CONTROL DEVICE OF HYDRAULIC ACTUATION TYPE TRANSMISSION FOR VEHICLE 失效
公开(公告)号：JPH0771584A
公开(公告)日：1995-03-17
申请号：JP21439793
申请日：1993-08-30
申请人： HONDA MOTOR CO LTD
发明人： SAKAI TAKAFUMI , WAKAMATSU HIDEKI , HARAGUCHI KENICHI , ONO NAOTO
IPC分类号： F16H61/06
摘要： PURPOSE:To certainly carry out torque transmission by a high speed step preceding torque transmission by a low speed step by damping pressure rise of a hydraulic engagement element for the low speed step at the initial stage of in-gear by an accumulator in a low pressure range and making it possible to raise hydraulic pressure of a hydraulic engagement element for a high speed step during that time. CONSTITUTION:In a hydraulic control circuit 10 of a transmission to carry out speed change of forward four steps and a reverse one step, at the time of in-gear by switching from a N range to a D range, by supplying oil to a second gear speed clutch C2 as well as a first gear speed clutch C1, a second gear speed step is once established, and thereafter, by draining oil from the second gear speed clutch C2, the first gear speed step is established. At the time of such squat control, an oil passage L20 connected to a back pressure chamber of an accumulator 21 connected in parallel to the first gear speed clutch C1 is, at the time of second gear speed, made possible to open to the air by a shift valve 13 through a shift valve 14 and an oil passage L21. Consequently, at the time of the second gear speed at the initial stage of in-gear, back pressure of the accumulator 21 is made low pressure, and pressure rise of the first gear speed clutch 1 is damped in a low pressure range where no actual engagement of a clutch is caused.

2. 发明专利

JPH0771583A CONTROL DEVICE OF HYDRAULIC ACTUATION TYPE TRANSMISSION FOR VEHICLE 失效
公开(公告)号：JPH0771583A
公开(公告)日：1995-03-17
申请号：JP21750093
申请日：1993-09-01
申请人： HONDA MOTOR CO LTD
发明人： SAKAI TAKAFUMI , WAKAMATSU HIDEKI , HARAGUCHI KENICHI , TAKAMATSU MASAAKI
IPC分类号： F16H61/06 , F16H61/02
摘要： PURPOSE:To reduce an in-gear shock by providing a directional control valve free to control direction in a first position communicating a back pressure chamber of an accumulator connected in parallel to a hydraulic engagement element for a low speed step and a back pressure generation source to each other and in a second position to make internal pressure of the back pressure chamber low pressure by way of cutting this communication. CONSTITUTION:In a hydraulic control circuit 10 of a transmission to carry out speed change of advance four steps and a reverse one step, to an oil passage L23 for back pressure of an accumulator A1 connected in parallel to a hydraulic engagement element C1 for a low speed step, hydraulic pressure from an oil passage L22 is supplied through a directional control valve 33. On the directional control valve 33, hydraulic pressure of the element 1 is made to work through an oil passage L2c, until this hydraulic pressure rises to specified pressure, the oil passage L23 for back pressure is connected to an oil drainage port 33a, and back pressure of the accumulator A1 is made low pressure. At the initial stage of in-gear, pressure rise of the hydraulic engagement element C1 for the low speed step is damped in a low pressure range and the element C1 is gradually engaged, and thereafter, at the point of time when hydraulic pressure of the element C1 rises to the specified pressure, the directional control valve 33 is controlled to change direction and to supply hydraulic pressure to the oil passage L23 for back pressure.

3. 发明专利

JPH0771579A CONTROL DEVICE OF HYDRAULIC ACTUATION TYPE TRANSMISSION FOR VEHICLE 失效
公开(公告)号：JPH0771579A
公开(公告)日：1995-03-17
申请号：JP21439693
申请日：1993-08-30
申请人： HONDA MOTOR CO LTD
发明人： SAKAI TAKAFUMI , WAKAMATSU HIDEKI , HARAGUCHI KENICHI
IPC分类号： F16H61/04 , F16H61/02 , F16H61/06 , F16H61/08
摘要： PURPOSE:To reduce frequency of using an accumulator by way of moderating a sudden pressure drop of a second hydraulic engagement element by communicating the accumulator previously made in a pressure accumulated state by supplying oil to a first hydraulic engagement element to an oil drainage passage through a control valve. CONSTITUTION:A hydraulic control circuit 10 in a transmission to carry out speed change of four forward steps and one reverse step is furnished with a manual valve free to switch over, first to third shift valves 13-15, a servo valve for forward and reverse switching and others. In this case, an accumulator 21 connected to a first hydraulic engagement element C1 constantly supplying oil through an oil passage L14 is provided. In the oil passage L14, a control valve 22 switched and controlled by two electromagnetic valves 203, 204 is provided. At the time of changing speed by way of releasing other hydraulic engagement elements C2, C3, oil drainage passage LD connected to each of the hydraulic engagement elements C2, C3 is connected to the accumulator 21 through the control valve 22, and a pressure drop characteristic of each of the engagement elements C2, C3 is controlled by the accumulator 21.

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