Downshifting time torque-down control device and method

• US 6,929,581 B2
• Filed: 09/08/2003
• Issued: 08/16/2005
• Est. Priority Date: 09/13/2002
• Status: Expired due to Fees

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Sugimura, Toshio
• Primary Examiner(s): Wright, Dirk
• Application Number:
  US10/656,107
• Publication Number:
  US 20040053744A1
• Time in Patent Office: 708 Days
• Field of Search: 477/102, 477/109, 701/54, 701/60
• US Class Current: 477/102
• CPC Class Codes: B60W 10/04 including control of propulsion units
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/11 Stepped gearings
• CPC Class Codes: B60W 2050/0042 Transfer function lag; delays
• CPC Class Codes: B60W 30/1819 Propulsion control with control means using analogue circuits, relays or mechanical links
• CPC Class Codes: B60W 30/19 Improvement of gear change, e.g. by synchronisation or smoothing gear shift
• CPC Class Codes: F02D 2250/18 Control of the engine output torque
• CPC Class Codes: F02D 2250/21 during a transition between engine operation modes or states
• CPC Class Codes: F02D 41/023 in relation with the gear ratio shifting conjoint control for improving gear change B60W30/19
• CPC Class Codes: F02P 5/1504 with particular means during a transient phase, e.g. acceleration, deceleration, gear change during starting F02P5/1506
• CPC Class Codes: F02P 5/152 dependent on pinking detecting or indicating knocks in internal-combustion engines G01L23/22
• CPC Class Codes: F16H 2059/425 Rate of change of input or turbine shaft speed
• CPC Class Codes: F16H 2306/42 Changing the input torque to the transmission
• CPC Class Codes: F16H 61/0437 by using electrical signals F16H61/0403 and F16H61/061 take precedence
• CPC Class Codes: F16H 61/686 with orbital gears
• CPC Class Codes: F16H 63/502 for smoothing gear shifts
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

In a torque-down control device, an entire delay amount SB of ignition timing is restricted using a guard value GSB. Also, when a rotational speed change ΔNT of a turbine speed NT during delay control falls out of an allowable range, the feedback control of the entire delay amount SB is performed based on the rotational speed change ΔNT is equal to a target rotational speed change ΔNTT. Accordingly, an excessive decrease in engine torque even when downshifting is performed simultaneously with delay control by a knock control portion. Further, the feedback control of the entire delay amount SB is performed based on the rotational speed change ΔNT, and the guard value GSB is learned and corrected based on the feedback correction amount. Accordingly, an appropriate shifting characteristic can be obtained regardless of individual differences and change with time.

Claims

1. A torque-down control device, comprising:

a guard portion which restricts a predetermined delay amount of ignition timing using a guard value when ignition timing of an engine is delayed by the predetermined delay amount during downshifting of a transmission such that engine torque is temporarily decreased, and

a learning portion which corrects the guard value based on a change in a rotational speed of a rotating member whose rotational speed changes due to the downshifting.

2. The torque-down control device according to claim 1, wherein, when the predetermined delay amount is on a delay side with respect to the guard value, the ignition timing during downshifting is delayed by the guard value.

3. The torque-down control device according to claim 1, wherein when the predetermined delay amount is on an advance side with respect to the guard value, the ignition timing during downshifting is delayed by the predetermined delay amount.

4. The torque-down control device according to claim 1, wherein the rotating member is a turbine of a torque converter.

5. A torque-down control device, comprising:

a feedback control portion which performs feedback control of a predetermined delay amount based on a change in a rotational speed of a rotating member whose rotational speed changes when ignition timing of an engine is delayed by the predetermined delay amount during downshifting of a transmission such that engine torque is temporarily decreased.

6. The torque-down control device according to claim 5, wherein, when the change in the rotational speed falls outside a predetermined allowable range, the feedback control portion performs the feedback control such that the change in the rotational speed falls within the predetermined allowable range.

7. The torque-down control device according to claim 5, wherein the rotating member is a turbine of a torque converter.

8. A torque-down control device, comprising:

a guard portion which restricts a predetermined delay amount of ignition timing using a guard value when the ignition timing of an engine is delayed by the predetermined delay amount during downshifting of a transmission such that engine torque is temporarily decreased;

a feedback control portion which performs feedback control of the predetermined delay amount based on a change in a rotational speed of a rotating member when the change in the rotational speed of the rotating member whose rotational speed changes due to the downshifting falls outside a predetermined allowable range; and

a learning portion which corrects the guard value based on a feedback correction amount by the feedback control portion.

9. The torque-down control device according to claim 8, wherein, when the predetermined delay amount is on a delay side with respect to the guard value, the ignition timing during downshifting is delayed by the guard value.

10. The torque-down control device according to claim 8, wherein when the predetermined delay amount is on an advance side with respect to the guard value, the ignition timing during downshifting is delayed by the predetermined delay amount.

11. The torque-down control device according to claim 8, wherein the rotating member is a turbine of a torque converter.

12. A control method by a torque-down control device, comprising the steps of:

controlling ignition timing of an engine by setting a delay amount of the ignition timing of an engine to equal to or lower than a guard value during downshifting of a transmission, and

correcting the guard value based on a change in a rotational speed of a rotating member whose rotational speed changes due to downshifting.

13. A control method by a torque-down control device, comprising the step of:

performing feedback control of a predetermined delay amount based on a change in a rotational speed of a rotating member whose rotational speed changes when ignition timing of an engine is delayed by the predetermined delay amount during downshifting of a transmission such that engine torque is temporarily decreased.

14. A control method by a torque-down control device, comprising the step of:

controlling ignition timing of an engine by setting a delay amount of the ignition timing of an engine to equal to or lower than a guard value during downshifting of a transmission,

performing feedback control of the predetermined delay amount based on a change in a rotational speed of a rotating member when the change in the rotational speed of the rotating member whose rotational speed changes due to the downshifting falls outside a predetermined allowable range, and

correcting the guard value based on a feedback correction amount in the feedback control.