Claims
- 1. A speed change control system for a synchromesh type transmission, comprising:
- a synchromesh mechanism including a sleeve ring adapted to be moved in an axial direction of an output shaft to mesh with an idle gear to fix said idle gear with respect to said output shaft;
- a shift actuator for acting on a shift fork connected to said sleeve ring to effect engagement/disengagement between said sleeve ring and said idle gear; and
- pressure control means for making variable a pressure applied by said shift actuator to said shift fork, said pressure control means setting said pressure so high from a speed change start to a balk point that said shift fork moves as fast as possible and so low from the balk point that shift shock is reduced.
- 2. A speed change control system for a synchromesh type transmission according to claim 1, including rotation sensors for detecting RPM of an input to the transmission and RPM of a counter gear, said pressure control means controlling said pressure based on detected outputs of said rotation sensors to effect substantially constant rates of change of said RPM of the input to said transmission and said RPM of the counter gear.
- 3. A speed change control system for a synchromesh type transmission according to claim 1, including a stroke sensor for detecting stroke movement of said shift fork and stroking velocity of said shift fork, rotation sensors for detecting RPM of an input to the transmission and RPM of a counter gear, and balk point deciding means for deciding, based on detected outputs from said stroke sensor and said rotation sensors, that a stroke at which rates of change of said RPM of the input to the transmission and said RPM of the counter are within a predetermined range and when said stroking velocity is substantially zero indicates the balk point, and for outputting a balk point detecting signal to said pressure control means.
- 4. A speed change control system for a synchromesh type transmission according to claim 3, wherein said balk point deciding means executes the balk point decision when the input side of said transmission and a clutch mechanism are disconnected, when said transmission is neutral and when the rate of change of said idle gear or said counter gear is within a predetermined range.
- 5. A speed change control system for a synchromesh type transmission, comprising:
- a synchromesh mechanism including a sleeve ring adapted to be moved in an axial direction of an output shaft to mesh with an idle gear to fix said idle gear with respect to said output shaft;
- a shift actuator for acting on a shift fork connected to said sleeve ring to effect engagement/disengagement between said sleeve ring and said idle gear;
- rotation sensors for detecting RPM of an input to the transmission and RPM of a counter gear:
- pressure control means for varying a pressure applied by said shift actuator to said shift fork by controlling said pressure based on detected outputs of said rotation sensors to effect substantially constant rates of change of said RPM of the input to said transmission and said RPM of the counter gear.
- 6. A speed change control system for a synchromesh type transmission according to claim 5, including a stroke sensor for detecting stroke movement of said shift fork and stroking velocity of said shift fork, rotation sensors for detecting RPM of an input to the transmission and RPM of a counter gear, and balk point deciding means for deciding, based on detected outputs from said stroke sensor and said rotation sensors, that a stroke at which rates of change of said RPM of the input to the transmission and said RPM of the counter are within a predetermnined range and when said stroking velocity is substantially zero indicates the balk point, and for outputting a balk point detecting signal to said pressure control means.
- 7. A speed change control system for a synchromesh type transmission according to claim 5, wherein said balk point deciding means executes the balk point decision when the input side of said transmission and a clutch mechanism are disconnected, when said transmission is neutral and when the rate of change of said idle gear or said counter gear is within a predetermined range.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9-189201 |
Jun 1997 |
JPX |
|
Parent Case Info
This application corresponds to and claims priority under 35 U.S.C. .sctn. 119 with respect to Japanese Application No. 09(1997)-189201 filed on Jun. 30, 1997, the entire content of which is incorporated herein by reference.
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Number |
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4901835 |
Frost |
Feb 1990 |
|
5429005 |
Fukui et al. |
Jul 1995 |
|
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62-12050 |
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JPX |
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GBX |
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