Vehicle control device and vehicle drive system

• US 20100250075A1
• Filed: 01/28/2010
• Published: 09/30/2010
• Est. Priority Date: 03/25/2009
• Status: Active Grant

• Current Assignee: Aisin AW Company Limited (Aisin Corp.)
• Original Assignee: Aisin AW Company Limited (Aisin Corp.)
• Inventors: Suzuki, Takehiko, Sekii, Takahiro, Komizo, Kyosuke, Kobayashi, Yasuhiko
• Granted Patent: US 8,280,599 B2
• Time in Patent Office: Days
• US Class Current: 701/55
• CPC Class Codes: B60K 2006/268 Electric drive motor starts the engine, i.e. used as starter motor
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/115 with planetary gears
• CPC Class Codes: B60W 2030/1809 Without torque flow between driveshaft and engine, e.g. with clutch disengaged or transmission in neutral
• CPC Class Codes: B60W 30/18072 Coasting
• CPC Class Codes: B60W 30/192 Mitigating problems related to power-up or power-down of the driveline, e.g. start-up of a cold engine
• CPC Class Codes: F16H 2059/186 Coasting
• CPC Class Codes: F16H 2061/0496 for low engine torque, e.g. during coasting, sailing or engine braking
• CPC Class Codes: F16H 61/21 Providing engine brake control

Abstract

A vehicle control device for controlling a vehicle drive device that includes an input member that is drive coupled to an engine, an output member that is drive coupled to a wheel, and a transmission apparatus that has a plurality of engaging elements, that switches a plurality of shift speeds by controlling engaging and releasing of the plurality of the engaging elements, and that transmits to the output member a rotational driving force of the input member by shifting the rotational driving force at gear ratios of the plurality of the shift speeds.

Claims

1. A vehicle control device for controlling a vehicle drive device that includes an input member that is drive coupled to an engine, an output member that is drive coupled to a wheel, and a transmission apparatus that has a plurality of engaging elements, that switches a plurality of shift speeds by controlling engaging and releasing of the plurality of the engaging elements, and that transmits to the output member a rotational driving force of the input member by shifting the rotational driving force at gear ratios of the plurality of the shift speeds, wherein

the transmission apparatus is provided with, as one of the plurality of the shift speeds, a one-way transmission speed at which the rotational driving force is transmitted from the input member to the output member and the rotational driving force is not transmitted from the output member to the input member;

and

the vehicle control device is provided with control unit that controls the transmission apparatus to implement the one-way transmission speed in an idle stop state in which the vehicle is in a moving state and the engine is stopped.

2. The vehicle control device according to claim 1, wherein

the transmission apparatus is provided with a first engaging element that, in an engaged state, transmits the rotational driving force of the input member to one of the plurality of rotating elements that are provided in the transmission apparatus, and a one-way clutch that, with the first engaging element in the engaged state, enters a state in which the rotational driving force is transmitted from the input member to the output member and enters a state in which the rotational driving force is not transmitted from the output member to the input member, and

the one-way transmission speed is implemented by operating the one-way clutch in coordination with the engaging of the first engaging element.

3. The vehicle control device according to claim 2, wherein in a case where the shift speed in the transmission apparatus when the engine is stopped is implemented by engaging at least the first engaging element, the control unit implements the one-way transmission speed in the idle stop state by engaging the first engaging element, and

in a case where the shift speed in the transmission apparatus when the engine is stopped is not a shift speed that is implemented by engaging at least the first engaging element, the control unit releases all of the engaging elements in the transmission apparatus in the idle stop state.

4. The vehicle control device according to claim 2, wherein

the control unit, in a case where a travel speed of the vehicle when the engine is stopped is not greater than a predetermined release threshold value, implements the one-way transmission speed in the idle stop state by engaging the first engaging element, and

the control unit, in a case where the travel speed of the vehicle when the engine is stopped is greater than the predetermined release threshold value, releases all of the engaging elements in the transmission apparatus in the idle stop state.

5. The vehicle control device according to claim 3, further comprising:

a mechanical pump that is driven by the rotational driving force of the engine and that discharges oil and an electric pump that discharges oil while the operation of the mechanical pump is stopped in a manner such that the mechanical pump and the electric pump are capable of supplying a hydraulic pressure to the plurality of the engaging elements, wherein

the control unit puts the electric pump into a non-driven state in a case where all of the engaging elements in the transmission apparatus are released in the idle stop state.

6. The vehicle control device according to claim 1, wherein

the one-way transmission speed is the shift speed at which a reduction ratio between the input member and the output member is the highest among forward shift speeds.

7. The vehicle control device according to claim 1, wherein

when the engine is restarted from the idle stop state while the vehicle is in motion,

the control unit engages a predetermined one of the engaging elements in the transmission apparatus after executing an engine speed control in which a revolution speed of the input member is controlled to become a target revolution speed that is determined based on the travel speed of the vehicle and on a target shift speed in the transmission apparatus when the engine is restarted.

8. The vehicle control device according to claim 7, wherein in a case where the target shift speed in the transmission apparatus is changed before the revolution speed of the input member becomes the target revolution speed while the engine speed control is being executed,

the control unit implements the post-change target shift speed after performing the engine speed control and implementing the pre-change target shift speed, when the target shift speed change pattern does not correspond to a permitted shift pattern that is determined in advance, and

the control unit stops the engine speed control, stops the implementation of the pre-change target shift speed, and implements the post-change target shift speed, when the target shift speed change pattern corresponds to the permitted shift pattern.

9. The vehicle control device according to claim 8, wherein

in a case where each of the shift speeds in the transmission apparatus is implemented by engaging two of the engaging elements, the permitted shift pattern is a change pattern that corresponds to a change between the shift speeds for which the engaging element that is engaged first is the same and the engaging elements that are engaged second are different and a change from the shift speed with a lower reduction ratio to the shift speed with a higher reduction ratio.

10. The vehicle control device according to claim 7, wherein

the one-way transmission speed is implemented by operating the one-way clutch in coordination with the engaging of the first engaging element,

the transmission apparatus is provided with the plurality of shift speeds that can be switched by selectively engaging any two of the plurality of the engaging elements, including the first engaging element, and has the shift speed that is implemented by engaging at least a second engaging element that is different from the first engaging element, and

in a case where the shift speed in the transmission apparatus when the engine is stopped is implemented by engaging the second engaging element, the control unit engages the second engaging element before engaging the other of the two engaging elements when the engine is restarted.

11. The vehicle control device according to claim 1, wherein

the transmission apparatus includes a first planetary gear train that has three rotating elements that are a first rotating element, a second rotating element, and a third rotating element in order by revolution speeds and a second planetary gear train that has four rotating elements that are a first rotating element, a second rotating element, a third rotating element, and a fourth rotating element in order by revolution speeds,

the first rotating element of the first planetary gear train is fixed to a non-rotating member,

the second rotating element of the first planetary gear train is selectively drive coupled through the first engaging element to the fourth rotating element of the second planetary gear train,

the third rotating element of the first planetary gear train is drive coupled to the input member,

when the second rotating element of the second planetary gear train rotates in reverse in relation to the non-rotating member, the second rotating element of the second planetary gear train is selectively fixed to the non-rotating member through the one-way clutch that enters an engaged state and is blocked from rotating, and

the third rotating element of the second planetary gear train is drive coupled to the output member.

12. The vehicle control device according to claim 11, wherein

the second rotating element of the first planetary gear train is also selectively drive coupled to the first rotating element of the second planetary gear train, and

the second rotating element of the second planetary gear train is also selectively drive coupled to the input member through the second engaging element.

13. The vehicle control device according to claim 12, wherein

the first rotating element of the second planetary gear train is also selectively fixed to the non-rotating member.

14. A vehicle control system, wherein

the output member that is provided in the vehicle drive device that is controlled by the vehicle control device according to claim 1 is drive coupled to a front wheel or a rear wheel of the vehicle, and

an output shaft of a rotating electrical machine that is capable of outputting a driving force is drive coupled to the other of the front wheel and the rear wheel of the vehicle.

15. The vehicle control device according to claim 3, wherein

the control unit, in a case where a travel speed of the vehicle when the engine is stopped is not greater than a predetermined release threshold value, implements the one-way transmission speed in the idle stop state by engaging the first engaging element, and

the control unit, in a case where the travel speed of the vehicle when the engine is stopped is greater than the predetermined release threshold value, releases all of the engaging elements in the transmission apparatus in the idle stop state.

16. The vehicle control device according to claim 15, further comprising:

a mechanical pump that is driven by the rotational driving force of the engine and that discharges oil and an electric pump that discharges oil while the operation of the mechanical pump is stopped in a manner such that the mechanical pump and the electric pump are capable of supplying a hydraulic pressure to the plurality of the engaging elements, wherein

the control unit puts the electric pump into a non-driven state in a case where all of the engaging elements in the transmission apparatus are released in the idle stop state.

17. The vehicle control device according to claim 4, further comprising:

a mechanical pump that is driven by the rotational driving force of the engine and that discharges oil and an electric pump that discharges oil while the operation of the mechanical pump is stopped in a manner such that the mechanical pump and the electric pump are capable of supplying a hydraulic pressure to the plurality of the engaging elements, wherein

the control unit puts the electric pump into a non-driven state in a case where all of the engaging elements in the transmission apparatus are released in the idle stop state.

18. The vehicle control device according to claim 2, wherein

the one-way transmission speed is the shift speed at which a reduction ratio between the input member and the output member is the highest among forward shift speeds.

19. The vehicle control device according to claim 3, wherein

the one-way transmission speed is the shift speed at which a reduction ratio between the input member and the output member is the highest among forward shift speeds.

20. The vehicle control device according to claim 3, wherein

when the engine is restarted from the idle stop state while the vehicle is in motion,

the control unit engages a predetermined one of the engaging elements in the transmission apparatus after executing an engine speed control in which a revolution speed of the input member is controlled to become a target revolution speed that is determined based on the travel speed of the vehicle and on a target shift speed in the transmission apparatus when the engine is restarted.