Model-based torque converter control

• US 7,752,021 B2
• Filed: 09/01/2006
• Issued: 07/06/2010
• Est. Priority Date: 09/01/2006
• Status: Expired due to Fees

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (General Motors Company)
• Inventors: Holtz, Vincent, De Dreuille, Maxence, Rambert, Marc
• Primary Examiner(s): Craig; Dwin M
• Application Number:
  US11/515,519
• Publication Number:
  US 20080126043A1
• Time in Patent Office: 1,404 Days
• Field of Search: 703/6, 703/7, 701/51, 701/67, 701/84, 701/87, 701/90
• US Class Current: 703/6
• CPC Class Codes: F16H 2061/145 for controlling slip, e.g. approaching target slip value
• CPC Class Codes: F16H 61/143 using electric control means

Abstract

A method of controlling hydraulic pressure to a torque converter is provided. The method includes: determining a slip error from a target slip value and a measured slip; integrating said slip error; determining a state space feedback control matrix for said measured slip; determining a state space feedback control matrix for said integrated slip error; and controlling pressure based on said state space feedback control matrix for said measured slip and said state space feedback control matrix for said integrated slip error.

Claims

1. A torque converter control simulation system, comprising:

a controller simulator comprising;

a converter control module that integrates a slip error and determines an apply pressure value and a release pressure value based on state space feedback control including said integrated slip error and received signals including an engine torque signal, an engine speed signal, a turbine speed signal, a target slip signal and a measured slip signal; and

a hydraulic control module that determines a pressure signal based on said apply pressure and said release pressure; and

a mechanical simulator comprising;

a hydraulic module that simulates hydraulic flow of two main valves according to a solenoid signal and based on a state space representation of the solenoid and the valves; and

a mechanical module that simulates the mechanical functions of a torque converter based on torque relationships within the torque converter.

2. The system of claim 1 wherein said converter control module determines said apply pressure and said release pressure based on computing a summation of an engine torque correction pressure, a commanded pressure correction pressure, and a steady state correction pressure.

3. The system of claim 2 wherein said engine torque correction pressure (Deptorq) is determined based on engine torque (C_m), a coefficient based on n number of clutches with a surface area A and a radius r (nAr), and a friction coefficient (μ

).

4. A torque converter control simulation system, comprising:

a controller simulator comprising;

a converter control module that integrates a slip error and determines an apply pressure value and a release pressure value for a torque converter clutch based on state space feedback control including said integrated slip error and received signals including an engine torque signal, an engine speed signal, a turbine speed signal, a target slip signal and a measured slip signal; and

a hydraulic control module that determines a pressure signal based on said apply pressure and said release pressure; and

a mechanical simulator comprising;

a hydraulic module that simulates a hydraulic flow of two main valves according to a solenoid signal and based on a state space representation of the solenoid and the valves; and

a mechanical module that simulates the mechanical functions of a torque converter based on torque relationships within the torque converter,

wherein said engine torque correction pressure (Deptorq) is determined based on an engine torque (C_m), a coefficient based on n number of clutches with a surface area A and a radius r (nAr), and a friction coefficient (μ

) and where;

5. A torque converter control simulation system, comprising:

a controller simulator comprising;

a converter control module that integrates a slip error and determines an apply pressure value and a release pressure value for a torque converter clutch based on state space feedback control including said integrated slip error and received signals including an engine torque signal, an engine speed signal, a turbine speed signal, a target slip signal and a measured slip signal; and

a hydraulic control module that determines a pressure signal based on said apply pressure and said release pressure; and

a mechanical simulator comprising;

a hydraulic module that simulates a hydraulic flow of two main valves according to a solenoid signal and based on a state space representation of the solenoid and the valves; and

a mechanical module that simulates the mechanical functions of a torque converter based on torque relationships within the torque converter,

wherein said converter control module determines said apply pressure and said release pressure based on computing a summation of an engine torque correction pressure, a commanded pressure correction pressure, and a steady state correction pressure, and

wherein said commanded pressure correction (retat_action) is determined based on engine inertia (I_m), a coefficient based on n number of clutches with a surface area A and a radius r (nAr), a friction coefficient (μ

), a correction based on a state space feedback control matrix (r_u), engine speed (E_S), and a solution of pump torque (E_S1).

6. The system of claim 5 wherein said commanded pressure correction (retat_action) is determined based on:

7. A torque converter control simulation system, comprising:

a controller simulator comprising;

a converter control module that integrates a slip error and determines an apply pressure value and a release pressure value for a torque converter clutch based on state space feedback control including said integrated slip error and received signals including an engine torque signal, an engine speed signal, a turbine speed signal, a target slip signal and a measured slip signal; and

a hydraulic control module that determines a pressure signal based on said apply pressure and said release pressure; and

a mechanical simulator comprising;

a hydraulic module that simulates a hydraulic flow of two main valves according to a solenoid signal and based on a state space representation of the solenoid and the valves; and

a mechanical module that simulates the mechanical functions of a torque converter based on torque relationships within the torque converter,

wherein said steady state correction pressure (intetat_action) is determined based on engine inertia (I_m), a coefficient based on n number of clutches with a surface area A and a radius r (nAr), and a friction coefficient (μ

), a correction based on a state space feedback control matrix (r_cons), a difference between target slip and measured slip (error_u), engine speed (E_s), and a first solution of pump torque (E_s1).

8. The system of claim 7 wherein said steady state correction pressure (intetat_action) is determined based on:

9. A torque converter control simulation system, comprising:

a controller simulator comprising;

a converter control module that integrates a slip error and determines an apply pressure value and a release pressure value for a torque converter clutch based on state space feedback control including said integrated slip error and received signals including an engine torque signal, an engine speed signal, a turbine speed signal, a target slip signal and a measured slip signal; and

a hydraulic control module that determines a pressure signal based on said apply pressure and said release pressure; and

a mechanical simulator comprising;

a hydraulic module that simulates a hydraulic flow of two main valves according to a solenoid signal and based on a state space representation of the solenoid and the valves; and

a mechanical module that simulates the mechanical functions of a torque converter based on torque relationships within the torque converter,

wherein said hydraulic control module determines said pressure signal P_TCC based on a position of a valve that supplies said pressure (x₁), a capacity of the valve (C₁), a nominal feedback force of the valve (F₀), an area of the valve on an input side (A_reg), an area of the valve on an output side (A₁), a pressure that is output from the valve (P_reg), and a coefficient factor that compensates a difference between a commanded pressure and an actual line pressure (coeffP_linecorrection).

10. The system of claim 9 wherein said hydraulic control module determines said pressure signal P_TCC based on:

11. A torque converter control simulation system, comprising:

a controller simulator comprising;

a converter control module that integrates a slip error and determines an apply pressure value and a release pressure value for a torque converter clutch based on state space feedback control including said integrated slip error and received signals including an engine torque signal, an engine speed signal, a turbine speed signal, a target slip signal and a measured slip signal; and

a hydraulic control module that determines a pressure signal based on said apply pressure and said release pressure; and

a mechanical simulator comprising;

a hydraulic module that simulates a hydraulic flow of two main valves according to a solenoid signal and based on a state space representation of the solenoid and the valves; and

a mechanical module that simulates the mechanical functions of a torque converter based on torque relationships within the torque converter,

wherein said hydraulic module simulates hydraulic flow from a state space representation of a bond graph wherein x represents a system state vector, u represents an input vector and y represents an output vector, coefficients A and B, and

{dot over (x)}=A.x+B.u

y=C.x.

12. A torque converter control simulation system, comprising:

a controller simulator comprising;

a converter control module that integrates a slip error and determines an apply pressure value and a release pressure value for a torque converter clutch based on state space feedback control including said integrated slip error and received signals including an engine torque signal, an engine speed signal, a turbine speed signal, a target slip signal and a measured slip signal; and

a hydraulic control module that determines a pressure signal based on said apply pressure and said release pressure; and

a mechanical simulator comprising;

a hydraulic module that simulates a hydraulic flow of two main valves according to a solenoid signal and based on a state space representation of the solenoid and the valves; and

a mechanical module that simulates the mechanical functions of a torque converter based on torque relationships within the torque converter,

wherein the mechanical module simulates the mechanical functions based on engine inertia (I_m), a change in engine speed

13. A torque converter control simulation system, comprising:

a controller simulator comprising;

a converter control module that integrates a slip error and determines an apply pressure value and a release pressure value for a torque converter clutch based on state space feedback control including said integrated slip error and received signals including an engine torque signal, an engine speed signal, a turbine speed signal, a target slip signal and a measured slip signal; and

a hydraulic control module that determines a pressure signal based on said apply pressure and said release pressure; and

a mechanical simulator comprising;

a hydraulic module that simulates a hydraulic flow of two main valves according to a solenoid signal and based on a state space representation of the solenoid and the valves; and

a mechanical module that simulates the mechanical functions of a torque converter based on torque relationships within the torque converter,

wherein the mechanical module simulates the mechanical functions based on torque converter inertia (I_conv), a change in turbine speed