Throttle valve control device

Patent metadata

Field	Value
Publication number	US-2023417195-A1
Application number	US-202318337494-A
Country	US
Kind code	A1
Filing date	Jun 20, 2023
Priority date	Jun 23, 2022
Publication date	Dec 28, 2023
Grant date	—

Abstract

A throttle valve control device includes a valve arranged in a passage of a body and rotating together with a shaft to open and close the passage. A motor rotates the shaft such that the shaft is located at a valve fully-closed position, a valve fully-open position, or a valve intermediate position which is between the valve fully-closed position and the valve fully-open position. A coil spring applies a spring force to the shaft. A rotation angle sensor detects an opening degree of the valve. A controller executes a valve intermediate-position control within a range between a fully-open side threshold and a fully-closed side threshold between which the valve intermediate position is interposed. Outside the range, the controller executes a fully-open side control and a fully-closed side control which are different from the valve intermediate-position control.

First claim

What is claimed is:

1 . A throttle valve control device comprising:
a body having a passage and a motor space; a valve arranged in the passage of the body and configured to rotate together with a shaft to open and close the passage; a motor held in the motor space of the body and configured to rotate the shaft such that the shaft is located at a valve fully-closed position at which the valve is fully closed, a valve fully-open position at which the valve is fully open, or a valve intermediate position which is between the valve fully-closed position and the valve fully-open position; a coil spring arranged in the body and configured to apply a spring force as an opposing force to the shaft when the shaft rotates from the valve intermediate position to the valve fully-closed position and when the shaft rotates from the valve intermediate position to the valve fully-open position; a rotation angle sensor configured to detect an opening degree of the valve; and a controller configured to
execute a valve intermediate-position control within a range between a fully-open side threshold and a fully-closed side threshold, the fully-open side threshold being set between the valve intermediate position and the valve fully-open position, the fully-closed side threshold being set between the valve intermediate position and the valve fully-closed position,
execute a fully-open side control within a range between the valve fully-open position and the fully-open side threshold, and
execute a fully-closed side control within a range between the valve fully-closed position and the fully-closed side threshold, wherein
the fully-open side control and the fully-closed side control are defined as a first control, and the valve intermediate-position control is defined as a second control and different from the first control.

2 . The throttle valve control device according to claim 1 , wherein
the second control is lower in control sensitivity than the first control.

3 . The throttle valve control device according to claim 2 , wherein
the second control is higher in responsiveness than the first control.

4 . The throttle valve control device according to claim 1 , wherein
a movable range of the shaft includes a dead zone in which the shaft is free from the spring force of the coil spring at the valve intermediate position when the valve is rotated from the valve fully-open position to the valve intermediate position and when the valve is rotated from the valve fully-closed position to the valve intermediate position.

5 . The throttle valve control device according to claim 4 , wherein
the fully-open side threshold is between the valve fully-open position and the dead zone, and the fully-closed side threshold is between the valve fully-closed position and the dead zone.

6 . The throttle valve control device according to claim 1 , wherein
the first control and the second control are controls including a proportional term and an integral term, and a gain value of the integral term in the second control is smaller than a gain value of the integral term in the first control.

7 . The throttle valve control device according to claim 6 , wherein
an offset of the integral term in the second control is larger than an offset of the integral term in the first control.

8 . The throttle valve control device according to claim 1 , wherein
the controller is further configured to execute a control for learning of at least one of the valve intermediate position or the valve fully-closed position, and the fully-open side threshold and the fully-closed side threshold are determined based on a result of the learning.

9 . The throttle valve control device according to claim 1 , wherein
the controller is further configured to
obtain a difference between a target opening degree of the valve and an actual position detected by the rotation angle sensor,
execute a steady control when the difference is smaller than or equal to a predetermined value,
execute a transient control when the difference is larger than the predetermined value, and
execute the first control and the second control in the steady control.

Assignees

• Denso Daishin Corp
• Denso Corp

Inventors

• Nagaya Takumi
• Shimizu Tohru

Classifications

• F02D9/1065 Primary

  Mechanical control linkage between an actuator and the flap, e.g. including levers, gears, springs, clutches, limit stops of the like · CPC title

• F16K31/042

  with electric means, e.g. for controlling the motor or a clutch between the valve and the motor · CPC title

• F02D9/105

  having a throttle position sensor (detection of actuation F02D11/106) · CPC title

• F02D9/02

  concerning induction conduits (throttle valves, or arrangements thereof in conduits F02D9/08) · CPC title

• F02D11/105

  characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque · CPC title