Clutchless transmission apparatus for controlling gear-position shifting and control method thereof

• US 8,346,446 B2
• Filed: 04/18/2008
• Issued: 01/01/2013
• Est. Priority Date: 04/20/2007
• Status: Active Grant

• Current Assignee: BYD Company Limited
• Original Assignee: BYD Company Limited
• Inventors: Liu, Kai, Gong, Jian, Zhou, Xuguang, Zu, Bo, Yang, Guangming, Qi, Axi, Tang, Xiaohua, Zhou, Bo, Xu, Xunjin
• Primary Examiner(s): Zanelli, Michael J.
• Application Number:
  US12/596,524
• Publication Number:
  US 20100114441A1
• Time in Patent Office: 1,719 Days
• Field of Search: None
• US Class Current: 701/53
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/11 Stepped gearings
• CPC Class Codes: B60W 2510/1015 Input shaft speed, e.g. turbine speed
• CPC Class Codes: B60W 2710/0644 Engine speed
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 30/19 Improvement of gear change, e.g. by synchronisation or smoothing gear shift
• CPC Class Codes: F16H 2306/44 Removing torque from current gears
• CPC Class Codes: F16H 2306/46 Uncoupling of current gear
• CPC Class Codes: F16H 2306/48 Synchronising of new gear
• CPC Class Codes: F16H 2306/50 Coupling of new gear
• CPC Class Codes: F16H 59/46 dependent on a comparison between speeds
• CPC Class Codes: F16H 61/0403 Synchronisation before shifting
• CPC Class Codes: F16H 63/502 for smoothing gear shifts

Abstract

A clutchless transmission apparatus and control method thereof. The transmission apparatus comprises a motor (10) and a transmission (20), said motor (10) is connected to said transmission (20) and supplies power to said transmission (20) via an input shaft of the transmission (20), wherein said apparatus further comprises a control device (30), which is electrically connected to said motor (10) and said transmission (20), wherein said control device (30) is configured to determine whether a gear-position shifting is required based on rotation speed of said transmission (20), if a gear-position shifting is required, regulates torque of said motor (10) to control said transmission (20) to disengage, and then regulates the rotation speed of said motor (10) based on the rotation speed of said transmission (20) to control said transmission (20) to engage for shifting gear-position. The clutchless transmission apparatus provided in the present invention doesn'"'"'t need a clutch during gear-position shifting, and therefore it is light, simple, easy to maintain and control, and can be used in a wide range of application.

Claims

1. A clutchless transmission apparatus for controlling gear-position shifting, comprising:

a motor;

a transmission having an input shaft for receiving power;

the motor configured to supply power to the input shaft of the transmission;

a control device operatively coupled to the motor and to the transmission, wherein the control device is configured to;

determine whether a gear-position shifting is required based on a rotational speed of the transmission;

if a gear-position shifting is required, regulate a torque of the motor to control the transmission to disengage, and then regulate a rotational speed of the motor based on a rotational speed of the transmission to control the transmission to engage; and

wherein the transmission further includes a gear-position shifting actuator configured to control the engagement and disengagement of the transmission under electrical control by a transmission control unit.

2. The apparatus as claimed in claim 1, wherein the control device comprises:

a signal collecting unit configured to determine a rotational speed of the transmission;

a signal processing unit electrically connected to the signal collecting unit;

a motor control unit in operative communication with the signal processing unit;

the transmission control unit in operative communication with the signal processing unit, wherein the signal processing unit configured to;

receive the rotational speed of the transmission;

determine whether a gear-position shifting is required based on the received rotational speed of the transmission;

if a gear-position shifting is required, send instructions to the motor control unit to regulate the torque or the rotational speed of the motor; and

after the torque or rotational speed of the motor has been regulated, send instructions to the transmission control unit to disengage or engage the transmission.

3. The apparatus of claim 2, wherein the signal collecting unit is a rotational speed sensor.

4. A clutchless transmission apparatus for controlling gear-position shifting, comprising:

a motor;

a transmission having an input shaft for receiving power;

the motor configured to supply power to the input shaft of the transmission;

a control device operatively coupled to the motor and to the transmission, wherein the control device is configured to;

determine whether a gear-position shifting is required based on a rotational speed of the transmission;

if a gear-position shifting is required, regulate a torque of the motor to control the transmission to disengage, and then regulate a rotational speed of the motor based on a rotational speed of the transmission to control the transmission to engage;

wherein the control device further includes;

a signal collectin unit configured to determine a rotational speed of the transmission;

a signal processing unit electrically connected to the signal collecting unit;

a motor control unit in operative communication with the signal processing unit;

a transmission control unit in operative communication with the signal processing unit, wherein the signal processing unit configured to;

receive the rotational speed of the transmission;

determine whether a gear-position shifting is required based on the received rotational speed of the transmission;

if a gear-position shifting is required, send instructions to the motor control unit to regulate the for torque or the rotational speed of the motor; and

after the torque or rotational speed of the motor has been regulated, send instructions to the transmission control unit to disengage or engage the transmission

wherein the signal processing unit is further configured to store;

rotational speed threshold values (Si) each corresponding to a gear position;

a plurality of torque values (Mi) of the motor under zero load at each rotational speed threshold value (Si); and

transmission ratio values (Ki) each corresponding to a gear position;

wherein the signal collecting unit configured to collect the current rotational speed (S) of the transmission in real time;

wherein the signal processing unit configured to;

receive the current rotational speed (S);

compare the current rotational speed (S) with the rotational speed threshold values (Si) to determine whether a gear-position shifting is required at the current rotational speed (S);

if a gear-position shifting is required;

determine a torque (M) and a transmission ratio (K) corresponding to the current rotational speed (S);

select a target gear position according to the current gear position;

send instructions to the motor control unit to regulate the torque or rotational speed of the motor;

send instructions to the transmission control unit to disengage or engage the transmission in accordance with the torque and rotational speed of the motor;

wherein the motor control unit configured to receive instructions for regulating the torque or rotational speed of the motor from the signal processing unit and regulate the torque of the motor to a value of (M), and regulate the rotational speed of the motor to a value of (S)/(K); and

wherein the transmission control unit configured to;

receive the instructions from the signal processing unit to disengage or engage the transmission;

instruct the transmission to disengage when the torque of the motor is regulated to a value of (M);

instruct the transmission to engage to the target gear position when the rotational speed of the motor is regulated to a value of (S)/(K).

5. The apparatus as claimed in claim 4, wherein:

the motor control unit is configured to send a feedback signal to the signal processing unit indicating that torque synchronization is completed when the torque of the motor is regulated to a value of (M);

the signal processing unit is configured to send an instruction to the transmission control unit to disengage the transmission upon receiving the feedback signal indicating the torque synchronization is completed;

the transmission control unit is configured to send a feedback signal to the signal processing unit indicating the disengagement is completed;

the signal processing unit is configured to receive updated rotational speed (S′

) of the transmission, and send an instruction to the motor control unit for regulating the rotational speed of the motor upon receiving the feedback signal indicating the disengagement is completed;

the motor control unit is configured to send a feedback signal to the signal processing unit indicating the rotational speed synchronization is completed when the rotational speed of the motor is regulated to a value of (S′

)/(K); and

the signal processing unit is configured to send an instruction to the transmission control unit for engaging the transmission upon receiving the feedback signal indicating the rotational speed synchronization is completed.

6. The apparatus of claim 4, wherein the transmission further includes a gear-position shifting actuator configured to control the engagement and disengagement of the transmission under electrical control by the transmission control unit.

7. The apparatus of claim 4, wherein the number of the rotational speed threshold values (Si) is equal to N;

where (Si)=maximum rotational speed×

i/N; and

where, 2≦

N<

10, i is an integer, and 0<

i<

N.

8. The apparatus of claim 4, wherein

the number of the rotational speed threshold values (Si) is equal to 2N;

where (Si)=maximum rotational speed×

i/N±

Y;

where, 2≦

N<

10, i is an integer, and 0<

i<

N; and

Y is much smaller than (Si) and can differ for different threshold values (Si).

9. A control method for shifting a gear-position in an apparatus having a motor and a transmission, the method comprising:

determining whether a gear-position shifting is required based on a rotational speed of the transmission;

if a gear-position shifting is required;

regulating a torque of the motor to control the transmission to disengage;

regulating the rotational speed of the motor based on the rotational speed of the transmission to control the transmission to engage;

storing a plurality of rotational speed threshold values (Si) each corresponding to a gear position;

storing a plurality of torque values (Mi) of the motor under zero load at each rotational speed threshold value (Si);

storing a plurality of transmission ratios (Ki) each corresponding to a gear position;

determining a current rotational speed (S) of the transmission;

comparing the current rotational speed (S) with each of the rotational speed threshold values (Si) to determine whether a gear-position shifting is required at the current rotational speed (S);

if a gear-position shifting is required, determining a torque (M) and a transmission ratio (K) corresponding to the current rotational speed (S);

selecting a target gear position according to the current gear position;

regulating a torque of the motor to a value of (M) and regulating a rotational speed of the motor to a value of (S)/(K)

when the torque of the motor is regulated to a value of (M), instructing the transmission to disengage; and

when the rotational speed of the motor is regulated to a value of (S)/(K), instructing the transmission to engage to the target gear position.

10. The method as claimed in claim 9, further comprises:

determining a rotational speed of the transmission in real time;

determining whether a gear-position shifting is required at the determined rotational speed;

if a gear-position shifting is required, regulating a torque and a rotational speed of the motor;

when the regulation of the torque of the motor is completed, disengaging the transmission; and

when the regulation of the rotational speed of the motor is completed, engaging the transmission.

11. The method as claimed in claim 9, further comprising:

when the torque of the motor is regulated to a value of (M), sending a feedback signal indicating that torque synchronization is completed;

disengaging the transmission upon receiving the feedback signal indicating the torque synchronization is completed;

instructing the transmission to disengage, and sending a feedback signal indicating that disengagement is completed;

determining an updated rotational speed (S′

) of the transmission;

when the rotational speed of the motor is regulated to a value of (S′

)/(K), sending a feedback signal indicating that a rotational speed synchronization is completed; and

engaging the transmission to the target gear position upon receiving the feedback signal indicating the rotational speed synchronization is completed.

12. The method of claim 9, wherein the number of the rotational speed threshold values (Si) is equal to N,

where (Si)=maximum rotational speed×

i/N;

where, 2≦

N<

10;

where i is an integer; and

where 0<

i<

N.

13. The method of claim 9, wherein the number of the rotational speed threshold values (Si) is equal to 2N;

where (Si)=maximum rotational speed×

i/N±

Y;

where, 2≦

N<

10;

where i is an integer;

where 0<

i<

N; and

where Y is much smaller than (Si) and can differ for different threshold values (Si).