Transcript EVSTF-08-39ex

China and Japan Proposal for TF1
EVSTF-08-39e 1
 Scope of Vehicle Water Test
The scope of Vehicle Water Test should be limited only to the protection against
electric shock. The test method and criteria for the protection against fire hazards
should be discussed in Phase 2.
 Position of China and Japan
 The water test should be included in EVS-GTR Phase 1.
 Test exemption for vehicles with isolation monitoring system should be approved.
 Rationale
 Isolation resistance should be maintained in normal vehicle operation. Washing and
flooding are the typical examples of severe conditions in normal vehicle operation.
 Isolation monitoring system is effective as the measure for protection against
electric shock.
•
Isolation loss is not an immediate risk for electric shock. Then, providing a warning
for isolation loss is an effective protection method against electric shock.
•
GTR No.13 requires isolation monitoring system for FCVs to deal with isolation
deterioration of FC coolant. Consistent concept should be approved in EVS-GTR.
•
Test exemption becomes an incentive for vehicle manufacturers to install isolation
monitoring systems.
China and Japan Proposal for TF1
 Action item at March EVS-GTR meeting in Tokyo
China and Japan provide idea of how to confirm the functionality and reliability of
isolation monitoring system.
Basically, the provisions for FCVs in GTR No.13 and FMVSS305 are effective to confirm
the functionality and reliability of isolation monitoring system. Specific test methods based
on FMVSS305 are incorporated in China and Japan proposal.
2
3
China and Japan Proposal for TF1
Proposed text form China and Japan
6.1.2. Confirmation method for functions of on-board isolation resistance
monitoring system
The function of the on-board isolation resistance monitoring system shall be
confirmed by the following method or a method equivalent to it.
A resistor that does not causes the isolation resistance between the terminal being
monitored and the electrical chassis to drop below the minimum required isolation
resistance value shall be inserted. The warning signal shall be activated.
Current
EVS-GTR
Draft
The on-board isolation resistance monitoring system shall be tested using the
following procedure.
1. Determine the isolation resistance, Ri, of the high voltage source electric power
train with the electrical isolation monitoring system using the procedure outlined
in S7.6.2 through S7.6.7 6.1.1.
2. If the minimum isolation resistance value required in accordance with
paragraphs 5.1.1.2.4.1 or 5.1.1.2.4.2. is 100 ohm/V, insert a resistor with
resistance Ro equal to or greater than 1/(1/(95 times the working voltage of the
high voltage source electric power train) - 1/Ri) and less than 1/(1/(100 times
the working voltage of the high voltage source electric power train) - 1/Ri)
between the positive terminal of the high voltage source electric power train and
the electrical chassis.
Additional
Text
Proposal
based on
FMVSS305
China and Japan Proposal for TF1
4
Proposed text form China and Japan
3. If the minimum isolation resistance value required in accordance with
paragraphs 5.1.1.2.4.1 or 5.1.1.2.4.2. is 500 ohm/V, insert a resistor with
resistance Ro equal to or greater than 1/(1/(475 times the working voltage of
the electric power train) - 1/Ri) and less than 1/(1/(500 times the working
voltage of the electric power train) - 1/Ri) between the terminal of the electric
power train and the electrical chassis.
4. The electrical isolation monitoring system indicator shall display a warning
visible to the driver seated in the driver’s designated seating position.
Additional
Text
Proposal
based on
FMVSS305
Current EVS-GTR Draft
5
Specifications for Isolation monitoring system
5.X Protection against water effects (EVS-08-17e)
Protection against water effects shall be provided by an isolation resistance monitoring system, or
by protecting or shielding the voltage class B equipment from exposure to water. If the vehicle is
equipped with an isolation resistance monitoring system, the requirements of 5.X.1 shall apply. If
the vehicle is not equipped with an isolation resistance monitoring system, the tests given in 6.X.1
shall be performed in order that the requirements of 5.X.2 are met.
5.X.1 If an isolation resistance monitoring system is provided, and the isolation resistance less than
the requirements given in 5.1.1.2.4 is detected, a warning shall be indicated to the driver.
The function of the on-board isolation resistance monitoring system shall be confirmed as described
in 6.1.2.
5.X.2 If the test procedures specified in 6.X.1 are performed, just after each exposure, and with the
vehicle still wet, the vehicle shall then comply with isolation resistance test given in 6.1.1, and the
isolation resistance requirements given in 5.1.1.2.4 shall be met.
In addition, after a 24 h pause, the isolation resistance test specified in 6.1.1 shall again be
performed, and the isolation resistance requirements given in 5.1.1.2.4 shall be met.
Confirmation of the isolation resistance monitoring system
performance is already required in current EVS-GTR draft.
Current EVS-GTR Draft
Specifications for Isolation monitoring system
6.1.2. Confirmation method for functions of on-board isolation resistance monitoring
system
The function of the on-board isolation resistance monitoring system shall be confirmed by the
following method or a method equivalent to it.
A resistor that does not cause the isolation resistance between the terminal being monitored
and the electrical chassis to drop below the minimum required isolation resistance value shall
be inserted. The warning signal shall be activated.
This part is the confirmation procedures for the isolation
monitoring system function based on EVS No.13.
6
7
FMVSS305
Specifications in FMVSS305NPRM
S5.4.4 Electrical isolation monitoring.
Each DC high voltage sources of vehicles with a fuel cell system shall be monitored by an
electrical isolation monitoring system that displays a warning for loss of isolation when tested
according to S8. The system must monitor its own readiness and the warning display must
be visible to the driver seated in the driver's designated seating position.
FMVSS305 requires the isolation monitoring system for FCVs.
FMVSS305
8
Specifications in FMVSS305NPRM
S8. Test procedure for on-board electrical isolation monitoring system.
Prior to any impact test, the requirements of S5.4 for the on-board electrical isolation monitoring
system shall be tested using the following procedure.
1. The electric energy storage device is at the state of charge specified in S7.1.
2. The switch or device that provides power from the high voltage system to the propulsion
motor(s) is in the activated position or the ready-to-drive position.
3. Determine the isolation resistance, Ri, of the high voltage source with the electrical isolation
monitoring system using the procedure outlined in S7.6.2 through S7.6.7.  See next page.
4. Insert a resistor with resistance Ro equal to or greater than 1/(1/(95 times the working voltage
of the high voltage source) - 1/Ri) and less than 1/(1/(100 times the working voltage of the high
voltage source) - 1/Ri) between the positive terminal of the high voltage source and the
electrical chassis.
5. The electrical isolation monitoring system indicator shall display a warning visible to the driver
seated in the driver’s designated seating position.
Confirmation of the isolation monitoring system function is required in
FMVSS305. It’s more specific than current EVS-GTR draft. Paragraph 2.
to 5. is referred in China and Japan proposal.
9
Explanation regarding newly inserted calculation formula
Isolation monitoring system for 100 ohms/v detection
insert a resistor with resistance Ro equal to or greater
than 1/(1/(95 times the working voltage of the electric
power train) - 1/Ri) and less than 1/(1/(100 times the
working voltage of the electric power train)
Battery
Ri
Inverter
MOT
R0
Vehicle chassis
Ri: Isolation resistance of vehicle system
1
1
< R0 <
1
95 ×Vb
－
1
100 ×Vb
1
1
Ri
100 ×Vb
<
1
R0
Resistance value at 100ohms/V
＋
1
Ri
<
－
R0: Isolation resistance to be inserted
1
Ri
1
95 ×Vb
Resistance value at 95ohms/V
95 ohms/V < Combined resistance of R1 and R0 < 100 ohms/V
95% value of 100 ohms/V
10
Explanation regarding newly inserted calculation formula
Isolation monitoring system for 500 ohms/v detection
insert a resistor with resistance Ro equal to or greater
than 1/(1/(475 times the working voltage of the electric
power train) - 1/Ri) and less than 1/(1/(500 times the
working voltage of the electric power train)
Battery
Ri
Inverter
MOT
R0
Vehicle chassis
Ri: Isolation resistance of vehicle system
1
1
< R0 <
1
475 ×Vb
－
1
500 ×Vb
1
1
Ri
500 ×Vb
<
1
R0
Resistance value at 100ohms/V
＋
1
Ri
<
－
R0: Isolation resistance to be inserted
1
Ri
1
475 ×Vb
Resistance value at 95ohms/V
475 ohms/V < Combined resistance of R1 and R0 < 100 ohms/V
95% value of 500 ohms/V