Urea-SCR system and control method thereof
First Claim
1. A method for controlling a urea-SCR system comprising:
- a first step of calculating a target urea injection amount;
a second step of using urea injection pressure and urea injection time to calculate a real urea injection amount;
a third step of calculating a difference value between the target urea injection amount and the real urea injection amount, and monitoring the difference value at a predetermined time interval;
a fourth step of accumulating difference values for a determined time when the difference value exceeds a predetermined level, and transferring an alarm signal to a driver when the average value thereof exceeds a predetermined level; and
a fifth step of starting to accumulate a number of engine starts and driving distance after transferring the alarm signal, and when the number of engine starts is larger than a predetermined value or the driving distance is longer than a predetermined value, if the difference value does not become lower than a predetermined level, recharging a urea tank with a urea solution.
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Accused Products
Abstract
A method for controlling an urea-SCR system may include a first step for calculating a target urea injection amount, a second step that uses urea injection pressure and urea injection time to calculate a real urea injection amount, a third step that calculates a difference value between the target urea injection amount and the real urea injection amount, and monitors the difference value at a predetermined time interval, a fourth step that accumulates difference values for a determined time when the difference value exceeds a predetermined level, and transfers an alarm signal to a driver when the average value thereof exceeds a predetermined level, and/or a fifth step that starts to accumulate a number of engine starts and driving distance after transferring the alarm signal, and when the number of engine starts is larger than a predetermined value or the driving distance is longer than a predetermined value, if the difference value does not become lower than a predetermined level, executes urea recharging means for a driver to charge a urea tank with a urea solution. The urea consumption amount may be continuously monitored, the remained urea amount may be accurately detected, and the urea recharging may be induced in time such that the nitrogen oxide exhaust is prevented.
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Citations
12 Claims
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1. A method for controlling a urea-SCR system comprising:
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a first step of calculating a target urea injection amount; a second step of using urea injection pressure and urea injection time to calculate a real urea injection amount; a third step of calculating a difference value between the target urea injection amount and the real urea injection amount, and monitoring the difference value at a predetermined time interval; a fourth step of accumulating difference values for a determined time when the difference value exceeds a predetermined level, and transferring an alarm signal to a driver when the average value thereof exceeds a predetermined level; and a fifth step of starting to accumulate a number of engine starts and driving distance after transferring the alarm signal, and when the number of engine starts is larger than a predetermined value or the driving distance is longer than a predetermined value, if the difference value does not become lower than a predetermined level, recharging a urea tank with a urea solution. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A selective catalyst reduction device control system, comprising:
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a selective catalyst reduction device that is mounted on an exhaust pipe so as to eliminate nitrogen oxide that is included in exhaust gas; a urea tank in which a urea solution is stored; an injector that injects the urea solution supplied from the urea tank; and a control portion that calculates a target injection amount and a real injection amount that is to be injected from the injector, and that generates an alarm signal if the difference value between the target injection amount and the real injection amount is larger than a predetermined value; wherein the control portion includes; a counting portion that counts a number of engine starts after generating the alarm signal; an accumulating portion that accumulates the driving distance after generating the alarm signal; and a recharging induction portion that generates a recharging signal for recharging the urea tank with a urea solution if the difference value is larger than the predetermined value, if the number of engine starts or the accumulated driving distance is larger than the predetermined value. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification