Gear shift control device of vehicle

Patent metadata

Field	Value
Publication number	US-11951990-B2
Application number	US-202318190655-A
Country	US
Kind code	B2
Filing date	Mar 27, 2023
Priority date	Apr 5, 2022
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

A gear shift control device of an automobile including a driving motor, a relay clutch capable of disconnecting an engine, includes memory storing a gear shift map for determining the switching start timing of the gear position, a transmission control unit that switches the gear position based on the gear shift map, a regeneration control unit, and a relay clutch control unit. The gear shift map includes a cooperative regeneration map and non-cooperative regeneration maps that define the thresholds of relatively low revolutions. The threshold of a predetermined low gear shift point is defined to be smaller than the thresholds of the gear shift points higher than the predetermined low gear shift point on the downshift side in the non-cooperative regeneration maps, and is defined to be smaller than the threshold of the predetermined low gear shift point on the downshift side in the cooperative regeneration map.

First claim

The invention claimed is:

1. A gear shift control device of a vehicle including an engine and a motor installed as driving sources, an automatic transmission provided between the driving sources and drive wheels, the automatic transmission performing a gear shift by switching between high and low gear positions through hydraulic control, and a relay clutch provided between the engine and the automatic transmission to enable the engine to be disconnected from the automatic transmission, the gear shift control device comprising:
memory storing a gear shift map that defines, for each of gear shift points, thresholds of a number of revolutions on a downshift side and on an upshift side to determine a switching start timing of each of the gear positions;
one or more processors configured to:
switch between the gear positions based on the gear shift map;
control regeneration by the motor; and
control the relay clutch,

wherein the gear shift map includes a cooperative regeneration map used in cooperative regeneration that cooperates with a brake, and a non-cooperative regeneration map used in other than cooperative regeneration, the non-cooperative regeneration map defining thresholds of revolutions lower than thresholds in the cooperative regeneration map, and
wherein a threshold of a predetermined low gear shift point is defined to be smaller than thresholds of gear shift points higher than the predetermined low gear shift point on the downshift side in the non-cooperative regeneration map, and is defined to be smaller than a threshold of the predetermined low gear shift point on the downshift side in the cooperative regeneration map.

2. The gear shift control device according to claim 1 ,
wherein the thresholds of gear shift points higher than the predetermined low gear shift point are defined to be an identical value on the downshift side in the cooperative regeneration map.

3. The gear shift control device according to claim 2 ,
wherein the non-cooperative regeneration map includes a first map that defines thresholds of relatively low revolutions and a second map that defines thresholds of relatively high revolutions, and
wherein thresholds of gear shift points equal to or lower than the predetermined low gear shift point on the downshift side in both the first map and the second map are defined to be an identical value.

4. The gear shift control device according to claim 3 ,
wherein the one or more processors perform deceleration regeneration start processing that disconnects the relay clutch in a predetermined high speed position during deceleration and perform deceleration regeneration end processing that connects the disconnected relay clutch,
wherein the deceleration regeneration end processing includes first deceleration regeneration end processing that connects the relay clutch by using the cooperative regeneration map before the vehicle stops and second deceleration regeneration end processing that connects the relay clutch before switching at the predetermined low gear shift point by using the non-cooperative regeneration map, and
wherein both the engine and the motor are driven and a friction engagement element of the automatic transmission is slipped during the switching at the predetermined low gear shift point in the second deceleration regeneration end processing.

5. The gear shift control device according to claim 4 ,
wherein when switching is performed at a gear shift point higher than the predetermined low gear shift point in the second deceleration regeneration end processing, the motor is driven according to the gear shift point.

6. The gear shift control device according to claim 1 ,
wherein the non-cooperative regeneration map includes a first map that defines thresholds of relatively low revolutions and a second map that defines thresholds of relatively high revolutions, and
wherein thresholds of gear shift points equal to or lower than the predetermined low gear shift point on the downshift side in both the first map and the second map are defined to be an identical value.

7. The gear shift control device according to claim 1 ,
wherein the one or more processors perform deceleration regeneration start processing that disconnects the relay clutch in a predetermined high speed position during deceleration and perform deceleration regeneration end processing that connects the disconnected relay clutch,
wherein the deceleration regeneration end processing includes first deceleration regeneration end processing that connects the relay clutch by using the cooperative regeneration map before the vehicle stops and second deceleration regeneration end processing that connects the relay clutch before switching at the predetermined low gear shift point by using the non-cooperative regeneration map, and
wherein both the engine and the motor are driven and a friction engagement element of the automatic transmission is slipped during the switching at the predetermined low gear shift point in the second deceleration regeneration end processing.

8. The gear shift control device according to claim 2 ,
wherein the one or more processors perform deceleration regeneration start processing that disconnects the relay clutch in a predetermined high speed position during deceleration and perform deceleration regeneration end processing that connects the disconnected relay clutch,
wherein the deceleration regeneration end processing includes first deceleration regeneration end processing that connects the relay clutch by using the cooperative regeneration map before the vehicle stops and second deceleration regeneration end processing that connects the relay clutch before switching at the predetermined low gear shift point by using the non-cooperative regeneration map, and
wherein both the engine and the motor are driven and a friction engagement element of the automatic transmission is slipped during the switching at the predetermined low gear shift point in the second deceleration regeneration end processing.

9. The gear shift control device according to claim 6 ,
wherein the one or more processors perform deceleration regeneration start processing that disconnects the relay clutch in a predetermined high speed position during deceleration and perform deceleration regeneration end processing that connects the disconnected relay clutch,
wherein the deceleration regeneration end processing includes first deceleration regeneration end processing that connects the relay clutch by using the cooperative regeneration map before the vehicle stops and second deceleration regeneration end processing that connects the relay clutch before switching at the predetermined low gear shift point by using the non-cooperative regeneration map, and
wherein both the engine and the motor are driven and a friction engagement element of the automatic transmission is slipped during the switching at the predetermined low gear shift point in the second deceleration regeneration end processing.

10. The gear shift control device according to claim 7 ,
wherein when switching is performed at a gear shift point higher than the predetermined low gear shift point in the second deceleration regeneration end processing, the motor is driven according to the gear shift point.

11. The gear shift control device according to claim 8 ,
wherein when switching is performed at a gear shift point higher than the predetermined low gear shift point in the second deceleration regeneration end processing, the motor is driven according to the gear shift point.

12. The gear shift control device according to claim 9 ,
wherein when switching is performed at a gear shift point higher than the predet

Assignees

• Mazda Motor

Inventors

• Nishikori Daigo
• Gotan Hiroaki
• Inagaki Akina
• Okubo Tomohiro
• Higo Kiminori
• Mikami Takayuki

Classifications

• B60W30/19 Primary

  Improvement of gear change, e.g. by synchronisation or smoothing gear shift · CPC title

• B60W10/08

  including control of electric propulsion units, e.g. motors or generators · CPC title

• B60W10/11

  Stepped gearings · CPC title

• B60W30/18127

  Regenerative braking · CPC title

• B60W2710/025

  Clutch slip, i.e. difference between input and output speeds · CPC title