Method and device for controlling a vehicle transmission

Abstract

Method for controlling a transmission, comprising: determining a speed change mode of a vehicle according to a speed change command by the driver and a target time t2 according to the speed change mode; calculating a speed difference (ΔΔΔ) between an input shaft and an output shaft with respect to an actual time t1; calculating a speed increment (ΔΔΔ_accel) or speed decrement (ΔΔΔ_decel) of the output shaft, which is accelerated or decelerated according to the speed change mode, from the actual time t1 to the target time t2; calculating a synchronization torque of a synchronizing device (108) using the speed difference (ΔΔΔ) and the speed increment (ΔΔΔ_accel) or speed decrement (ΔΔΔ_decel); determining a target displacement of the synchronizing device (108) using the Synchronization torque;and control of the synchronizing device (108) according to the target displacement and synchronizing a sleeve with a clutch gear.;

Description

General state of the art1. Technical field

[0001] The present invention relates to a method and a device for controlling a vehicle transmission and in particular to a method and a device for controlling the synchronization of a synchronizing device included in a transmission. 2. Description of the state of the art

[0002] Generally, the power generated by an engine is transmitted through a transmission and ultimately delivered to the wheels at varying speed and torque. Transmissions are broadly divided into manual transmissions and automatic transmissions. In a manual transmission, when the driver moves the gear lever to a desired gear position, the shift fork, connected by a cable, moves a sleeve and engages it with a desired clutch gear, thereby changing the speed. The manual transmission requires the driver to participate in each operation to change the speed according to the driving condition, which causes inconvenience due to actions such as operating the clutch.

[0003] To solve the above-mentioned problem, automatic transmissions have recently been widely used in vehicles. In automatic transmissions, a transmission control unit automatically performs gear shifting to a target gear position according to the vehicle's driving conditions (vehicle speed, throttle opening, etc.). Since automatic transmissions require no special action from the driver to change speed, they enable comfortable driving. However, automatic transmissions cause problems such as deterioration in fuel efficiency and power.

[0004] Recently, an automated manual transmission has been marketed that combines the advantages of a manual transmission with those of an automatic transmission. In the automated manual transmission, the shift fork is shifted by a shift motor connected to an electronic device, such as a transmission control unit, rather than by the shift lever connected to it via a cable.

[0005] Such a transmission uses a synchronizer to control smooth synchronization between the clutch and gears when the speed changes. Designed to control smooth meshing between the gears when the vehicle speed changes, the synchronizer synchronizes the rotational speed of the sleeve with the rotational speed of the clutch gear. If the synchronization torque controlling the synchronizer is too high, shock will be generated due to the inertia of the gears, thus reducing drivability when the vehicle speed changes. If the synchronization torque controlling the synchronizer is too low, the sleeve will not engage the clutch gear.

[0006] Therefore, in order to precisely perform a speed change while minimizing a shock corresponding to the speed change, a method is required to determine an appropriate synchronization torque applied to the synchronizer and to control the synchronizer more precisely based on the determined synchronization torque. Short summary

[0007] It is an object of the present invention to provide a transmission control method and a transmission control apparatus for performing a speed change more precisely and smoothly by controlling a synchronizer by calculating an optimal control position according to the actual driving situation when the vehicle is running and performing feedback calibration according to a control error.

[0008] It should be understood that the objects of the present invention are not limited to the above-mentioned object. Other objects of the present invention will become apparent to those skilled in the art from the following descriptions. The objects and advantages of the invention may be realized and attained by the elements recited in the claims and any combination thereof.

[0009] According to one aspect of the present invention, a method for controlling a transmission comprises: determining a speed change mode of a vehicle and a target time corresponding to the speed change mode; calculating a speed difference between an input shaft and an output shaft with respect to an actual time; calculating a speed increment or speed decrement of the output shaft from the actual time to the target time; calculating a synchronization torque using the speed difference and the speed increment or speed decrement; determining a target displacement of a synchronizer using the synchronization torque; and controlling the synchronizer according to the target displacement and detecting a sleeve with a clutch gear.

[0010] According to another aspect of the present invention, a transmission control apparatus includes: a calculator configured to determine a speed change mode of a vehicle and a target time corresponding to the speed change mode, calculate a speed difference between an input shaft and an output shaft with respect to an actual time, calculate a speed increment or speed decrement of the output shaft from the actual time to the target time, and calculate a synchronization torque using the speed difference and the speed increment or speed decrement; and a controller configured to determine a target displacement of a synchronizer using the synchronization torque and control the synchronizer according to the target displacement and detecting a sleeve with a clutch gear.

[0011] According to the present invention described above, the vehicle speed can be changed more precisely and smoothly by controlling a synchronizer by calculating an optimal control position according to the actual driving situation when the vehicle is running and performing feedback calibration according to a control error. Brief description of the drawings

[0012] Fig. 1 is a block diagram illustrating a transmission control apparatus according to an embodiment of the present invention.

[0013] Fig. Figure 2 shows the control of a transmission in an acceleration situation according to an embodiment of the present invention.

[0014] Fig. 3 shows the control of a transmission in a deceleration situation according to an embodiment of the present invention.

[0015] Fig. 4 is a flowchart showing a method of controlling a transmission according to an embodiment of the present invention. Detailed description

[0016] The above advantages, objects, and features of the invention will be explained in detail with reference to the accompanying drawings so that a person skilled in the art can easily practice the present invention. In describing the present invention, detailed explanation of known technologies will be omitted when it is found that such explanation may unnecessarily obscure the gist of the present invention. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Wherever possible, like reference numerals are used to designate like or similar parts throughout the drawings. It should be understood that the present invention is not limited to the following embodiments, and the embodiments are provided for illustrative purposes only.The scope of the invention is to be determined only by the accompanying claims and their equivalents.

[0017] Fig. 1 is a block diagram illustrating a transmission control apparatus according to an embodiment of the present invention.

[0018] According to Fig. 1 comprises a transmission control device 102 according to one embodiment, a computer 104 and a control unit 106 . The calculator 104 Determines a speed change mode of the vehicle and a target time corresponding to the speed change mode, and calculates a speed difference between an input shaft and an output shaft with respect to the actual time. The calculator 104 further calculates a speed increment or speed decrement of the output shaft from the actual time to a target time and calculates a synchronization torque using the speed difference and the speed increment or speed decrement.

[0019] The control unit 106 determines a target displacement of a synchronizing device 108 using the computer 104 calculated synchronization torque and controls the synchronization device 108 according to the determined target displacement to synchronize a sleeve and a clutch gear. In this embodiment, the control unit 106 detect a synchronization gradient between the sleeve and the clutch gear, determine a calibration value by comparing the detected synchronization gradient and the target gradient and the target displacement of the synchronization device 108 Calibrate to the target displacement using the determined calibration value.

[0020] According to the embodiment, the control device 106Furthermore, the determined target displacement into a target control position of an actuator for driving the synchronization device 108 and the actuator is controlled according to the target control position to synchronize the 108 to move into the target displacement.

[0021] Hereinafter, a method for controlling a transmission according to an embodiment of the present invention will be described with reference to Fig. 2 to Fig. 4 described in detail.

[0022] According to Fig. 4 the computer determines 104 a speed change mode according to a driver command to change the speed ( 402 ). The speed change modes are divided into an acceleration mode and a deceleration mode. Fig. 2 shows a speed change operation performed when the speed change mode is the acceleration mode. Fig. Figure 3 shows a speed change operation performed when the speed change mode is the deceleration mode. The calculator then determines 104 a target time t2 corresponding to the determined speed change mode ( 402 ).

[0023] The calculator then calculates 104 a speed difference between an input shaft and an output shaft with respect to the actual time t1 ( 404 ). In Fig. 2 and Fig. 3, the speed difference between the input shaft and the output shaft with respect to the actual time t1 is given, for example, as Δω.

[0024] The calculator then calculates 104 a speed increment or speed decrement (amount of speed increase or amount of speed reduction) of the output shaft from the actual time t1 to the target time t2 ( 406 ). In Fig. 2 is the speed increment of the output shaft from the actual time t1 to the target time t2 with Δω accel specified. In Fig. 3 is the speed decrement of the output shaft from the actual time t1 to the target time t2 with Δω decel specified.

[0025] The calculator then calculates 104 a synchronization torque using the calculated speed difference Δω and the speed increment or speed decrement (Δω accel or Δω decel ) ( 408 ). If the speed change mode is as shown in Fig. 2 is the acceleration mode, the synchronization torque can be calculated using equation 1 below: Equation 1

[0026] In equation 1, T cone the synchronization torque, Δω the speed difference between the input shaft and the output shaft, Δω accelthe speed increment, Δt the difference between the target time t2 and the actual time t1 and J eq,n the equivalent inertia for the engagement of gear step n.

[0027] If the speed change mode is as in Fig. 3 is the deceleration mode, the synchronization torque can be calculated using equation 2 below: Equation 2

[0028] In equation 2, T cone the synchronization torque, Δω the speed difference between the input shaft and the output shaft, Δω decel a speed decrement, Δt the difference between the target time t2 and the actual time t1 and J eq,n the equivalent inertia for the engagement of gear step n.

[0029] The control unit 106 determines a target displacement of the synchronization device 108 using the calculated synchronization torque ( 410). The control unit then synchronizes 106 the sleeve and the clutch gear by controlling the synchronizer 108 according to the determined target displacement ( 412 ). During this process, the control unit 106 the determined target displacement into a target control position of an actuator for driving the synchronization device 108 convert and the synchronization device 108 by controlling the actuator according to the target control position into the target displacement.

[0030] Although in Fig. 4 not shown, the control unit 106 detect a synchronization gradient during synchronization between the sleeve and the clutch gear and determine a calibration value by comparing the detected synchronization gradient and a target gradient. The control unit 106The target displacement can be calculated by applying the determined calibration value to the target displacement of the synchronizing device 108 calibrate.

[0031] A person skilled in the art will recognize that the present invention can be variously substituted, modified and changed without departing from the technical spirit of the invention, and that the present invention is not limited to the embodiments described above and the accompanying drawings.

Claims

[1] Method for controlling a transmission, comprising: Determining a speed change mode of a vehicle and a target time corresponding to the speed change mode; Calculating a speed difference between an input shaft and an output shaft with respect to an actual time; Calculating a speed increment or speed decrement of the output shaft from the actual time to the target time; Calculating a synchronization torque using the speed difference and the speed increment or speed decrement; Determining a target displacement of a synchronizing device ( 108 ) using the synchronization torque; and Control of the synchronization device ( 108 ) according to the target displacement and detecting a sleeve with a coupling gear. [2] The method of claim 1, further comprising: Detection of a synchronization gradient between the sleeve and the clutch gear; Comparing the synchronization gradient and a target gradient and determining a calibration value; and Apply the calibration value to the target displacement. [3] The method of claim 1, wherein the synchronization torque is determined using equation 1 when the speed change mode is an acceleration mode: Equation 1 where T cone the synchronization torque, Δω the speed difference, Δω accel the speed increment, Δt a difference between the target time and the actual time t1 and J eq,n is the equivalent inertia for the engagement of gear stage n. [4] The method of claim 1, wherein the synchronization torque is determined using equation 2 when the speed change mode is a deceleration mode: Equation 2 where T cone the synchronization torque, Δω the speed difference, Δω decel the speed decrement, Δt a difference between the target time and the actual time t1 and J eq,n is the equivalent inertia for the engagement of gear stage n. [5] The method of claim 1, wherein synchronizing comprises: Converting the target displacement into a target control position of an actuator for driving the synchronization device ( 108 ); and Controlling the actuator according to the target control position and moving the synchronization device ( 108 ) into the target displacement. [6] Device for controlling a transmission, the device comprising: a computer ( 104) configured to determine a speed change mode of a vehicle and a target time corresponding to the speed change mode, calculate a speed difference between an input shaft and an output shaft with respect to an actual time, calculate a speed increment or speed decrement of the output shaft from the actual time to the target time, and calculate a synchronization torque using the speed difference and the speed increment or speed decrement; and a control unit ( 106 ), which is designed in such a way that it provides a desired displacement of a synchronizing device ( 108 ) using the synchronization torque and the synchronization device ( 108 ) according to the desired displacement and by detecting a sleeve with a coupling gear. [7] Device according to claim 6, wherein the control device ( 106) detects a synchronization gradient between the sleeve and the coupling gear, compares the synchronization gradient and a target gradient, determines a calibration value and applies the calibration value to the target displacement. [8] The apparatus of claim 6, wherein the synchronization torque is determined from equation 1 when the speed change mode is an acceleration mode: Equation 1 where T cone the synchronization torque, Δω the speed difference, Δω accel the speed increment, Δt a difference between the target time and the actual time t1 and J eq,n is the equivalent inertia for the engagement of gear stage n. [9] The apparatus of claim 6, wherein the synchronization torque is determined from equation 2 when the speed change mode is a deceleration mode: Equation 2 where Tcone the synchronization torque, Δω the speed difference, Δω decel the speed decrement, Δt a difference between the target time and the actual time t1 and J eq,n is the equivalent inertia for the engagement of gear stage n. [10] Device according to claim 6, wherein the control device ( 106 ) the target displacement into a target control position of an actuator for driving the synchronization device ( 108 ) and controls the actuator according to the target control position and the synchronization device ( 108 ) into the target displacement.

Images