US2014290603A1PendingUtilityA1
System and method for controlling variable valve time
Assignee: JIANGSU GONGDA POWER TECHNOLOGIES CO LTDPriority: Jan 4, 2013Filed: Jan 3, 2014Published: Oct 2, 2014
Est. expiryJan 4, 2033(~6.4 yrs left)· nominal 20-yr term from priority
F01L 13/0015F02D 13/0253F01L 9/10
32
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Claims
Abstract
The present disclosure provides a variable valve time control system and method. The variable valve time control system comprises an actuator, an actuation switch valve, an electronic control unit and a displacement sensor. The electronic control unit controls the actuation switch valve. The displacement sensor detects the engine valve displacement signal. The electronic control unit calculates the engine valve opening and closing times based on the displacement signal from the engine valve displacement sensor, and translates the engine valve opening and closing times into the corresponding switch times of the actuation-switch-valve power output.
Claims
exact text as granted — not AI-modifiedWe claim:
1 . A variable valve time control system, comprising
an actuator; an actuation switch valve; an electronic control unit, controlling the actuation switch valve; a displacement sensor, detecting the displacement signal of an engine valve; and the electronic control unit, calculating the engine valve opening and closing times based on the displacement signal from the engine valve displacement sensor, and converting the engine valve opening and closing times into the corresponding switch times of the actuation-switch-valve power output.
2 . The variable valve time control system of claim 1 , further comprising a start switch valve; and wherein the electronic control unit controls the start-switch-valve power output.
3 . The variable valve time control system of claim 1 ,
further comprising an electrically-driven fluid pump source, and wherein the electronic control unit provides an electrically-driven fluid pump source power output, thereby controlling the electrically-driven fluid pump source.
4 . The variable valve time control system of claim 1 , wherein,
the electronic control unit further comprises an engine control unit and a valve control unit; the engine control unit calculates the engine valve opening and closing times based on the engine valve displacement signal from the displacement sensor; and the valve control unit translates the engine valve opening and closing times to the switch times of the actuation-switch-valve power output.
5 . The variable valve time control system of claim 1 , wherein the electronic control unit
detects the working state and power requirement of the engine; determines the engine valve opening and closing times; and according to at least one state parameter of the actuator system and its environment, translates the engine valve opening and closing times into the switch times of the actuation-switch-valve power output, resulting in a switch in the power state of the actuation switch valve, thereby controlling the opening and closing actions of the actuator and the engine valve.
6 . The variable valve time control system of claim 5 , wherein the at least one state parameter of the actuator system and its environment comprises the temperature of the working medium.
7 . The variable valve time control system of claim 5 , wherein the at least one state parameter of the actuator system and its environment comprises the pressure of the working medium.
8 . A variable valve time control method, to be applied in variable valve time control systems similar to that of claim 1 , comprising the following steps:
to measure the engine-valve displacement profile; to determine respectively the engine valve opening and closing startup times according to the engine valve opening-time and closing-time position-thresholds; to issue control signal by the valve control unit according to the engine intake and exhaust control algorithm; to determine the engine valve opening and closing delays; to determine respectively the engine valve opening and closing target-times; to obtain respectively the engine valve opening and closing control-deviations according to the engine intake and exhaust control algorithm; to determine respectively the engine valve opening and closing signal-times; to determine respectively the engine valve opening and closing estimated-delays; to determine respectively the engine valve opening and closing time delay-corrections through an inter-cycle iterative algorithm using the engine valve opening and closing time control-deviations; and to determine respectively the engine valve opening and closing signal-times of the current cycle.
9 . The variable valve time control method of claim 8 , wherein
the engine valve control signal is issued by the electronic control unit according to the need of the engine intake and exhaust control algorithm; and the control signal comprises a high-low level switch at the engine valve opening signal time and another high-low level switch at the engine valve closing signal time.
10 . The variable valve time control method of claim 8 , wherein
the engine valve opening delay is the difference between the engine valve opening start-up time and the engine valve opening signal time; the engine valve closing delay is the difference between the engine valve closing start-up time and the engine valve closing signal time; the engine valve opening time control deviation is the difference between the engine valve opening target time and the engine valve opening start-up time; the engine valve closing time control deviation is the difference between engine valve closing target time and the engine valve closing start-up time; the engine valve opening estimated-delay is the difference between the engine valve opening target time and the engine valve opening signal time; and the engine valve closing estimated-delay is the difference between the engine valve closing target time and the engine valve closing signal time.
11 . The variable valve time control method of claim 8 , wherein
the variable valve time control method is implemented by a proportional-integral-derivative control algorithm.
12 . The variable valve time control method of claim 8 , wherein
the variable valve time control method is completed by a proportional integral derivative control algorithm; the engine valve opening time control deviation ddt1 is related to the engine valve opening time delay correction ddt3 in the following formula:
ddt
3
(
t
)
=
K
p
ddt
1
(
t
)
+
K
p
K
i
∫
0
t
ddt
1
(
t
)
t
+
K
p
K
d
d
t
1
(
t
)
t
;
the engine valve closing time control deviation ddt2 is related to the engine valve closing time delay correction ddt4 in the following formula:
ddt
4
(
t
)
=
K
d
ddt
2
(
t
)
+
K
p
K
i
∫
0
t
ddt
2
(
t
)
t
+
K
p
K
d
d
t
2
(
t
)
t
;
among them, t is the time variable, Kp the proportional gain, Ki the integral gain and Kd the differential gain.
13 . The variable valve time control method of claim 10 , wherein
within the inter-cycle iterative algorithm, the engine valve opening estimated-delay is calculated as dt10 (k+1)=dt10 (k)+ddt3 (k), where ddt3 (k) is obtained in the Kth iteration within the control algorithm; and the engine valve closing estimated-delay is calculated as dt20 (k+1)=dt20 (k)+ddt4 (k), where ddt4 (k) is obtained in the Kth iteration within the control algorithm, where K is an integer.Join the waitlist — get patent alerts
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