ES003A_PwrDiscncts
ES003A_PwrDiscnct
ES003A_PowerDisconnect
Version: 0.0
Printed by: Rakesh Prabhakara
Printed on: Thursday, March 26, 2015
Generated from DOORS 9.5.1.2
Contents
1
Purpose
1
2
Interface Requirements
2
2.1
Definitions
2
2.1.1
Inputs
2
2.1.2
Outputs
2
2.1.3
Internally Defined Terms
2
3
Requirements
4
3.1
Primary Functional Requirements
4
3.2
Hardware Requirements
4
3.3
Software Requirements
4
3.3.1
Special Execution Requirements
4
3.3.2
Functional Requirements
4
3.3.2.1
Sub-Function: Calculate Delta Voltage
4
3.3.2.2
Sub-Function: Power Disconnect Sequence A Control
4
3.3.2.3
Sub-Function: Power Disconnect Sequence B Control
5
3.4
Diagnostic Requirements
5
3.4.1
Power Disconnect Fault for Inverter1 at Init (NTC 0x042)
5
3.4.1.1
Required Debounce Strategy
5
3.4.1.2
Requirements to Perform Diagnostic Test Conditions
5
3.4.1.3
Test Condition Negative Requirements
5
3.4.1.4
Test Condition Positive Requirements
5
3.4.2
Power Disconnect Fault for Inverter2 at Init (NTC 0x4A)
5
3.4.2.1
Required Debounce Strategy
5
3.4.2.2
Requirements to Perform Diagnostic Test Conditions
5
3.4.2.3
Test Condition Negative Requirements
6
3.4.2.4
Test Condition Positive Requirements
6
Contents
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ES003A_PowerDisconnect
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1 Purpose
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2 Interface Requirements
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2.1 Definitions
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2.1.1 Inputs
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For the purposes of this document, the input signals are referred to as stated in the following (note each
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input is identified in a separate object for linking purposes to the design):
Defined terms used in the document shall be in bold text.
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BattVltg: ADC Converted representation of Battery Voltage (Upstream of Power Disconnect)
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BattVltgSwd1: ADC Converted representation of Switch Voltage from Inverter 1 (Downstream of
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Power Disconnect)
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BattVltgSwd2: ADC Converted representation of Switch Voltage from Inverter 2(Downstream of
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Power Disconnect)
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ELECGLBPRM_IVTRCNT_CNT_U08: Number of Inverters
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StrtUpSt: Comprehensive collection of start-up bits indicating Power Up Sequence Type
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2.1.2 Outputs
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For the purposes of this document, the input signals are referred to as stated in the following (note each
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input is identified in a separate object for linking purposes to the design):
Defined terms used in the document shall be in bold text.
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PwrDiscnctATestCmpl: Flag Indicating that the sequence A is complete
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PwrDiscnctBTestCmpl: Flag Indicating that the sequence B is complete
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2.1.3 Internally Defined Terms
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For the purposes of this document, the internally defined variables are referred to as stated in the
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following (note each input is identified in a separate object for linking purposes to the design):
Defined terms used in the document shall be in underlined text.
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DeltaVltg1: This indiactes the difference between BattVltg and BattVltgSwd1.
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DeltaVltg2: This indiactes the difference between BattVltg and BattVltgSwd2
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PwrDisncntMaxSwdVltg: Field configurable variable that indicates largest voltage at which
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BattVltgSwd1 and BattVltgSwd2 saturate (nominally 16V)
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PwrDiscnctOpenThd: Voltage threshold for determining BattVltgSwd1 and BattVltgSwd2 is open
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PwrDiscnctSequenceA: PwrDiscnctSequenceA are the necessary steps performed by this function
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before the power disconnect is allowed to be closed.
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PwrDiscnctSequenceB: PwrDiscnctSequenceB are the necessary steps performed by this function after
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the power disconnect has been closed.
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3 Requirements
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3.1 Primary Functional Requirements
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The "Power Disconnect" Function shall verify that the PowerDisconnect is not stuck closed at
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initialization once per Ignition Cycle.
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3.2 Hardware Requirements
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NONE
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3.3 Software Requirements
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3.3.1 Special Execution Requirements
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The "Power Disconnect" function shall provide mechanism to split its startup procedure into pre-close
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(PwrDiscnctSequenceA) and post-close (PwrDiscnctSequenceB). This is necessary because a separate
function is actually responsible for closing the power disconnect.
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The "Power Disconnect" Function shall provide mechanism for its startup sequences to wait for
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StrtUpSt to performs its actions.
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3.3.2 Functional Requirements
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3.3.2.1 Sub-Function: Calculate Delta Voltage
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The "Power Disconnect" Function shall calculate DeltaVltg1 for BattVltgSwd1 as below:
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DeltaVltg1 = Abs(Min(PwrDiscnctMaxSwdVltg, BattVltg) - BattVltgSwd1);
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The "Power Disconnect" Function shall calculate DeltaVltg2 for BattVltgSwd2 as below:
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DeltaVltg2 = Abs(Min(PwrDiscnctMaxSwdVltg, BattVltg) - BattVltgSwd2); (Only when IvtrCnt =
2)
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3.3.2.2 Sub-Function: Power Disconnect Sequence A Control
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The "Power Disconnect" Function shall verify if the EPS Primary Disconnect is not stuck closed in
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PwrDiscnctSequenceA.
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The "Power Disconnect" Function shall reach conclusion PwrDiscnctATestCmpl = TRUE within 10s
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(CBE) under all conditons.
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3.3.2.3 Sub-Function: Power Disconnect Sequence B Control
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The "Power Disconnect" Function shall perform post-close sequences during PwrDiscnctSequenceB.
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The "Power Disconnect" Function shall reach conclusion for PwrDiscnctBTestCmpl = TRUE within
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10s (CBE) under all conditions.
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3.4 Diagnostic Requirements
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3.4.1 Power Disconnect Fault for Inverter1 at Init (NTC 0x042)
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3.4.1.1 Required Debounce Strategy
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The "Power Diconnect" Function shall use the ISO Based Error Accumulator strategy for NTC 0x042.
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3.4.1.2 Requirements to Perform Diagnostic Test Conditions
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The "Power Disconnect" Function shall perform the test for NTC 0x42 during PwrDiscnctSequenceA.
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3.4.1.3 Test Condition Negative Requirements
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The "Power Disconnect" Function shall provide a negative result on the test condition for NTC 0x042.0
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when DeltaVltg1 < PwrDiscnctOpenThd
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3.4.1.4 Test Condition Positive Requirements
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The "Power Disconnect" Function shall provide a positve result on the test condition for NTC 0x042
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when none of the negative result requirements are satisfied.
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3.4.2 Power Disconnect Fault for Inverter2 at Init (NTC 0x4A)
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3.4.2.1 Required Debounce Strategy
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The "Power Diconnect" Function shall use the ISO Based Error Accumulator strategy for NTC 0x04A.
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3.4.2.2 Requirements to Perform Diagnostic Test Conditions
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The "Power Disconnect" Function shall perform the test NTC 0x4A during PwrDiscnctSequenceA
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when IvtrCnt = 2.
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3.4.2.3 Test Condition Negative Requirements
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The "Power Disconnect" Function shall provide a negative result on the test condition for NTC
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0x04A.0 when DeltaVltg2 < PwrDiscnctOpenThd
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3.4.2.4 Test Condition Positive Requirements
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The "Power Disconnect" Function shall provide positve result on the test condition for NTC 0x04A
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none of the negative result requirements are satisfied.
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